PIC24FJ256GB412 DATA SHEET (09/01/2015) DOWNLOAD

PIC24FJ256GA412/GB412 FAMILY
16-Bit Flash Microcontrollers with Dual Partition Flash Memory,
XLP, LCD, Cryptographic Engine and USB On-The-Go
Extreme Low-Power Features
• Multiple Power Management Options for Extreme Power
Reduction:
- VBAT allows for lowest power consumption on backup
battery (with or without RTCC)
- Deep Sleep allows near total power-down with the ability to
wake-up on external triggers
- Sleep and Idle modes selectively shut down peripherals
and/or core for substantial power reduction and fast wake-up
- Doze mode allows CPU to run at a lower clock speed than
peripherals
• Alternate Clock modes allow On-the-Fly Switching to a Lower
Clock Speed for Selective Power Reduction
• Extreme Low-Power Current Consumption for Deep Sleep:
- WDT: 650 nA @ 2V typical
- RTCC: 650 nA @ 32 kHz, 2V typical
- Deep Sleep current, 60 nA typical
• 160 A/MHz in Run mode
High-Performance CPU
• Modified Harvard Architecture
• Up to 16 MIPS Operation @ 32 MHz
• 8 MHz Internal Oscillator:
- 96 MHz PLL option
- Multiple clock divide options
- Run-time self-calibration capability for maintaining better
than ±0.20% accuracy
- Fast start-up
• 17-Bit x 17-Bit Single-Cycle Hardware Fractional/Integer Multiplier
• 32-Bit by 16-Bit Hardware Divider
• 16 x 16-Bit Working Register Array
• C Compiler Optimized Instruction Set Architecture
• Two Address Generation Units for Separate Read and Write
Addressing of Data Memory
Cryptographic Engine
• Performs NIST Standard Encryption/Decryption
Operations without CPU Intervention
• AES Cipher Support for 128, 192 and 256-Bit Keys
• DES/3DES Cipher Support, with up to Three Unique Keys
for 3DES
• Supports ECB, CBC, OFB, CTR and CFB128 modes
• Programmatically Secure OTP Array for Key Storage
• True Random Number Generation
• Battery-Backed RAM Key Storage
Analog Features
• 10/12-Bit, up to 24-Channel Analog-to-Digital (A/D) Converter:
- Conversion rate of 500 ksps (10-bit), 200 kbps (12-bit)
- Auto-scan and threshold compare features
- Conversion available during Sleep
• One 10-Bit Digital-to-Analog Converter (DAC):
- 1 Msps update rate
• Three Rail-to-Rail, Enhanced Analog Comparators with
Programmable Input/Output Configuration
• Charge Time Measurement Unit (CTMU):
- Used for capacitive touch sensing, up to 24 channels
- Time measurement down to 100 ps resolution
 2015 Microchip Technology Inc.
Dual Partition Flash with Live Update
Capability
• Capable of Holding Two Independent Software Applications,
including Bootloader
• Permits Simultaneous Programming of One Partition while
Executing Application Code from the Other
• Allows Run-Time Switching Between Active Partitions
Universal Serial Bus Features
(PIC24FJXXXGB4XX Only)
• USB v2.0 On-The-Go (OTG) Compliant
• Dual Role Capable – Can Act as Either Host or Peripheral
• Low-Speed (1.5 Mb/s) and Full-Speed (12 Mb/s) USB
Operation in Host mode
• Full-Speed USB Operation in Device mode
• High-Precision PLL for USB
• USB Device mode Operation from FRC Oscillator – No Crystal
Oscillator Required
• Supports up to 32 Endpoints (16 bidirectional):
- USB module can use any RAM locations on the device as
USB endpoint buffers
• On-Chip USB Transceiver with Interface for Off-Chip
USB Transceiver
• Supports Control, Interrupt, Isochronous and Bulk Transfers
• On-Chip Pull-up and Pull-Down Resistors
Special Microcontroller Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
20,000 Erase/Write Cycle Endurance, Typical
Data Retention: 20 Years Minimum
Self-Programmable under Software Control
Supply Voltage Range of 2.0V to 3.6V
Two On-Chip Voltage Regulators (1.8V and 1.2V) for
Regular and Extreme Low-Power Operation
Programmable Reference Clock Output
In-Circuit Serial Programming™ (ICSP™) and
In-Circuit Emulation (ICE) via 2 Pins
JTAG Boundary Scan Support
Fail-Safe Clock Monitor (FSCM) Operation:
- Detects clock failure and switches to on-chip,
Low-Power RC (LPRC) Oscillator
Power-on Reset (POR), Power-up Timer (PWRT)
and Oscillator Start-up Timer (OST)
Separate Brown-out Reset (BOR) and Deep Sleep
Brown-out Reset (DSBOR) Circuits
Programmable High/Low-Voltage Detect (HLVD)
Flexible Watchdog Timer (WDT) with its own
RC Oscillator for Reliable Operation
Standard and Ultra Low-Power Watchdog Timers (ULPW) for
Reliable Operation in Standard and Deep Sleep modes
Temperature Range: -40°C to +85°C
DS30010089C-page 1
10-Bit DAC
Comparators
CTMU
MCCP/SCCP
IC/OC-PWM
I2C
SPI
UART/IrDA®
EPMP/EPSP
CLC
USB OTG
Crypto Engine
LCD Controller (pixels)
Deep Sleep + VBAT
Memory
10/12-Bit A/D (ch)
PIC24FJ256GA412/GB412 FAMILY
24
1
3
Y
3/4 31/15 6/6
3
4
6
Y
4
N
Y
512
Y
Device
Data
(bytes)
16/32-Bit Timers
Digital Peripherals
Program
(bytes)
Pins
Analog Peripherals
PIC24FJ256GA412
256K
16K
121
PIC24FJ256GA410
256K
16K
100
24
1
3
Y
3/4 31/15 6/6
3
4
6
Y
4
N
Y
480
Y
PIC24FJ256GA406
256K
16K
64
16
1
3
Y
3/4 31/15 6/6
3
4
6
Y
4
N
Y
248
Y
PIC24FJ128GA412
128K
16K
121
24
1
3
Y
3/4 31/15 6/6
3
4
6
Y
4
N
Y
512
Y
PIC24FJ128GA410
128K
16K
100
24
1
3
Y
3/4 31/15 6/6
3
4
6
Y
4
N
Y
480
Y
PIC24FJ128GA406
128K
16K
64
16
1
3
Y
3/4 31/15 6/6
3
4
6
Y
4
N
Y
248
Y
PIC24FJ64GA412
64K
8K
121
24
1
3
Y
3/4 31/15 6/6
3
4
6
Y
4
N
Y
512
Y
PIC24FJ64GA410
64K
8K
100
24
1
3
Y
3/4 31/15 6/6
3
4
6
Y
4
N
Y
480
Y
PIC24FJ64GA406
64K
8K
64
16
1
3
Y
3/4 31/15 6/6
3
4
6
Y
4
N
Y
248
Y
PIC24FJ256GB412
256K
16K
121
24
1
3
Y
3/4 31/15 6/6
3
4
6
Y
4
Y
Y
512
Y
PIC24FJ256GB410
256K
16K
100
24
1
3
Y
3/4 31/15 6/6
3
4
6
Y
4
Y
Y
480
Y
PIC24FJ256GB406
256K
16K
64
16
1
3
Y
3/4 31/15 6/6
3
4
6
Y
4
Y
Y
240
Y
PIC24FJ128GB412
128K
16K
121
24
1
3
Y
3/4 31/15 6/6
3
4
6
Y
4
Y
Y
512
Y
PIC24FJ128GB410
128K
16K
100
24
1
3
Y
3/4 31/15 6/6
3
4
6
Y
4
Y
Y
480
Y
PIC24FJ128GB406
128K
16K
64
16
1
3
Y
3/4 31/15 6/6
3
4
6
Y
4
Y
Y
240
Y
PIC24FJ64GB412
64K
8K
121
24
1
3
Y
3/4 31/15 6/6
3
4
6
Y
4
Y
Y
512
Y
PIC24FJ64GB410
64K
8K
100
24
1
3
Y
3/4 31/15 6/6
3
4
6
Y
4
Y
Y
480
Y
PIC24FJ64GB406
64K
8K
64
16
1
3
Y
3/4 31/15 6/6
3
4
6
Y
4
Y
Y
240
Y
Peripheral Features
• LCD Display Controller:
- Up to 64 Segments by 8 Commons
- Internal charge pump and low-power, internal resistor biasing
- Operation in Sleep mode
- New LCD charge pump consumes less than 4 A
• Up to Five External Interrupt Sources
• Peripheral Pin Select (PPS); allows Independent
I/O Mapping of Many Peripherals
• Six-Channel DMA Supports All Peripheral modules:
- Minimizes CPU overhead and increases
data throughput
• Five 16-Bit Timers/Counters with Prescalers:
- Can be paired as 32-bit timers/counters
• Using a combination of Timer, CCP, IC and OC Timers, the
Device can be Configured to use up to 31 16-Bit Timers,
and up to 15 32-Bit Timers
• Six Input Capture modules, each with a Dedicated
16-Bit Timer
• Six Output Compare/PWM modules, each with a
Dedicated 16-Bit Timer
• Four Single Output CCPs (SCCP) and Three Multiple
Output CCPs (MCCP) modules:
- Independent 16/32-bit time base for each module
- Internal time base and Period registers
- Legacy PIC24F Capture and Compare modes
(16 and 32-bit)
- Special variable frequency pulse and Brushless DC Motor
(BDCM) Output modes
DS30010089C-page 2
• Enhanced Parallel Master/Slave Port (EPMP/EPSP)
• Hardware Real-Time Clock/Calendar (RTCC) with
Timestamping:
- Tamper detection with timestamping feature and
tamper pin
- Runs in Deep Sleep and VBAT modes
• Four 3-Wire/4-Wire SPI modules (support 4 Frame modes)
with 8-Level FIFO Buffer
• Three I2C modules support Multi-Master/Slave mode and
7-Bit/10-Bit Addressing
• Six UART modules:
- Support RS-485, RS-232 and LIN/J2602
- On-chip hardware encoder/decoder for IrDA®
- Auto-wake-up on Auto-Baud Detect (ABD)
- 4-level deep FIFO buffer
• Programmable 32-Bit Cyclic Redundancy Check (CRC)
Generator
• Four Configurable Logic Cells (CLCs):
- Two inputs and one output, all mappable to
peripherals or I/O pins
- AND/OR/XOR logic and D/JK flip-flop functions
• High-Current Sink/Source (18 mA/18 mA) on All I/O Pins
• Configurable Open-Drain Outputs on Digital I/O Pins
• 5.5V Tolerant Inputs on Multiple I/O Pins
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
Pin Diagrams
64-Pin TQFP
49
50
52
51
54
53
55
56
57
59
58
62
61
60
64
RE5
RE6
RE7
RG6
RG7
RG8
MCLR
RG9
VSS
VDD
RB5
63
RE4
RE3
RE2
RE1
RE0
RF1
RF0
VBAT
VCAP
RD7
RD6
RD5
RD4
RD3
RD2
RD1
64-Pin QFN(1)
RC14
RC13
RD0
1
48
2
47
3
46
4
45
5
44
6
43
7
42
8
41
RD8
VSS
PIC24FJXXXGA406
RD11
RD10
RD9
33
32
19
18
17
RF7
RF3
RB6
RB7
AVDD
AVSS
RB8
RB9
RB10
RB11
VSS
VDD
RB12
RB13
RB14
RB15
RF4
RF5
31
16
30
34
RB0
29
35
15
28
36
14
27
13
VDD
RG2
RG3
RF6
26
37
25
12
24
RB4
RB3
RB2
RB1
23
38
22
OSCI/CLKI/RC12
11
21
OSCO/RC15
39
20
40
10
9
Legend: Shaded pins indicate pins tolerant to up to +5.5 VDC. See Table 1 for a complete description of pin functions.
Note 1: It is recommended to connect the metal pad on the bottom of the 64-pin QFN package to VSS.
 2015 Microchip Technology Inc.
DS30010089C-page 3
PIC24FJ256GA412/GB412 FAMILY
TABLE 1:
COMPLETE PIN FUNCTION DESCRIPTIONS FOR PIC24FJXXXGA406 DEVICES
Pin
Function
Pin
Function
1
LCDBIAS2/IC4/CTED4/PMD5/RE5
33
SEG12/AN16/RP16/RF3
2
LCDBIAS1/SCL3/IC5/PMD6/RE6
34
SEG40/RP30/RF2
3
LCDBIAS0/SDA3/IC6/PMD7/RE7
35
RF6
4
SEG0/C1IND/RP21/ICM1/OCM1A/PMA5/RG6
36
SDA1/RG3
5
VLCAP1/C1INC/RP26/OCM1B/PMA4/RG7
37
SCL1/RG2
6
VLCAP2/C2IND/RP19/ICM2/OCM2A/PMA3/RG8
38
VDD
OSCI/CLKI/RC12
7
MCLR
39
8
SEG1/AN21/C1INC/C2INC/C3INC/RP27/DAC1/PMA2/PMALU/RG9
40
OSCO/EOSCEN/CLKO/RC15
9
VSS
41
VSS
10
VDD
42
SEG13/CLC4OUT/RP2/RTCC/U6RTS/U6BCLK/ICM5/RD8
11
PGEC3/SEG2/AN5/C1INA/RP18/ICM3/OCM3A/RB5
43
SEG14/RP4/PMACK2/RD9
SEG15/C3IND/RP3/PMA15/PMCS2/RD10
12
PGED3/SEG3/AN4/C1INB/RP28/RB4
44
13
SEG4/AN1-/AN3/C2INA/RB3
45
SEG16/C3INC/RP12/PMA14/PMCS/PMCS1/RD11
14
SEG5/AN2/CTCMP/C2INB/RP13/CTED13/RB2
46
SEG17/CLC3OUT/RP11/U6CTS/ICM6/INT0/RD0
15
PGEC1/SEG6/CVREF-/AN1/RP1/CTED12/RB1
47
SOSCI/RC13
16
PGED1/SEG7/CVREF+/DVREF+/AN0/RP0/PMA6/RB0
48
SOSCO/SCLKI/RPI37/PWRLCLK/RC14
17
PGEC2/LCDBIAS3/AN6/RP6/RB6
49
SEG20/RP24/U5TX/ICM4/RD1
18
PGED2/SEG63/AN7/RP7/U6TX/RB7
50
SEG21/AN23/RP23/PMACK1/RD2
19
AVREF+/DVREF+
51
SEG22/RP22/ICM7/PMBE0/RD3
20
AVREF-/DVREF-
52
SEG23/RP25/PMWR/PMENB/RD4
21
COM7/SEG31/AN8/RP8/RB8
53
SEG24/RP20/PMRD/PMWR/RD5
22
COM6/SEG30/AN9/TMPR/RP9/PMA7/IOCB9/RB9
54
SEG25/C3INB/U5RX/OC4/RD6
23
TMS/COM5/SEG29/CVREF/AN10/SDO4/PMA13/RB10
55
SEG26/AN20/C3INA/U5RTS/U5BCLK/OC5/RD7
24
TDO/AN11/REFI1/SS4/FSYNC4/PMA12/RB11
56
VCAP
25
VSS
57
VBAT
26
VDD
58
SEG27/U5CTS/OC6/RF0
27
TCK/SEG18/AN12/CTED2/PMA11/RB12
59
COM4/SEG47/SCK4/RF1
28
TDI/SEG19/AN13/SDI4/CTED1/PMA10/RB13
60
COM3/PMD0/RE0
29
SEG8/AN14/RP14/CTED5/CTPLS/PMA1/PMALH/RB14
61
COM2/PMD1/RE1
30
SEG9/AN15/RP29/CTED6/PMA0/PMALL/RB15
62
COM1/PMD2/RE2
31
SEG10/RP10/SDA2/PMA9/RF4
63
COM0/CTED9/PMD3/RE3
32
SEG11/RP17/SCL2/PMA8/RF5
64
SEG62/LVDIN/CTED8/PMD4/RE4
Legend: RPn and RPIn represent remappable pins for Peripheral Pin Select functions.
DS30010089C-page 4
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
Pin Diagrams (Continued)
64-Pin TQFP
50
49
51
52
54
53
55
56
57
59
58
62
61
60
64
RE5
RE6
RE7
RG6
RG7
RG8
MCLR
RG9
VSS
VDD
RB5
63
RE4
RE3
RE2
RE1
RE0
RF1
RF0
VBAT
VCAP
RD7
RD6
RD5
RD4
RD3
RD2
RD1
64-Pin QFN(1)
1
48
2
47
RC14
RC13
3
46
RD0
4
45
5
44
6
43
RD11
RD10
RD9
7
42
8
41
PIC24FJXXXGB406
9
40
RD8
VSS
OSCO/RC15
OSCI/CLKI/RC12
32
31
30
29
VDD
D+/RG2
D-/RG3
RB6
RB7
AVDD
AVSS
RB8
RB9
RB10
RB11
VSS
VDD
RB12
RB13
RB14
RB15
RF4
RF5
28
33
27
16
26
RB0
VBUS/RF7
RF3
25
VUSB3V3
34
24
35
15
23
36
14
22
13
21
37
20
12
19
38
RB4
RB3
RB2
RB1
18
39
11
17
10
Legend: Shaded pins indicate pins tolerant to up to +5.5 VDC. See Table 2 for a complete description of pin functions.
Note 1: It is recommended to connect the metal pad on the bottom of the 64-pin QFN package to VSS.
 2015 Microchip Technology Inc.
DS30010089C-page 5
PIC24FJ256GA412/GB412 FAMILY
TABLE 2:
COMPLETE PIN FUNCTION DESCRIPTIONS FOR PIC24FJXXXGB406 DEVICES
Pin
Function
Pin
Function
1
LCDBIAS2/IC4/CTED4/PMD5/RE5
33
SEG12/AN16/RP16/USBID/RF3
2
LCDBIAS1/SCL3/IC5/PMD6/RE6
34
VBUS/RF7
3
LCDBIAS0/SDA3/IC6/PMD7/RE7
35
VUSB3V3
4
SEG0/C1IND/RP21/ICM1/OCM1A/PMA5/RG6
36
D-/RG3
5
VLCAP1/C1INC/RP26/OCM1B/PMA4/RG7
37
D+/RG2
6
VLCAP2/C2IND/RP19/ICM2/OCM2A/PMA3/RG8
38
VDD
7
MCLR
39
OSCI/CLKI/RC12
8
SEG1/AN21/C1INC/C2INC/C3INC/RP27/DAC1/PMA2/PMALU/RG9
40
OSCO/EOSCEN/CLKO/RC15
9
VSS
41
VSS
10
VDD
42
SEG13/CLC4OUT/RP2/RTCC/U6RTS/U6BCLK/ICM5/RD8
11
PGEC3/SEG2/AN5/C1INA/RP18/ICM3/OCM3A/RB5
43
SEG14/RP4/SDA1/PMACK2/RD9
12
PGED3/SEG3/AN4/C1INB/RP28/USBOE/RB4
44
SEG15/C3IND/RP3/SCL1/PMA15/PMCS2/RD10
13
SEG4/AN1-/AN3/C2INA/RB3
45
SEG16/C3INC/RP12/PMA14/PMCS/PMCS1/RD11
14
SEG5/AN2/CTCMP/C2INB/RP13/CTED13/RB2
46
SEG17/CLC3OUT/RP11/U6CTS/ICM6/INT0/RD0
15
PGEC1/SEG6/CVREF-/AN1/RP1/CTED12/RB1
47
SOSCI/RC13
16
PGED1/SEG7/CVREF+/DVREF+/AN0/RP0/PMA6/RB0
48
SOSCO/SCLKI/RPI37/PWRLCLK/RC14
17
PGEC2/LCDBIAS3/AN6/RP6/RB6
49
SEG20/RP24/U5TX/ICM4/RD1
18
PGED2/SEG63/AN7/RP7/U6TX/RB7
50
SEG21/AN23/RP23/PMACK1/RD2
19
AVREF+/DVREF+
51
SEG22/RP22/ICM7/PMBE0/RD3
20
AVREF-/DVREF-
52
SEG23/RP25/PMWR/PMENB/RD4
21
COM7/SEG31/AN8/RP8/RB8
53
SEG24/RP20/PMRD/PMWR/RD5
22
COM6/SEG30/AN9/TMPR/RP9/PMA7/IOCB9/RB9
54
SEG25/C3INB/U5RX/OC4/RD6
23
TMS/COM5/SEG29/CVREF/AN10/SDO4/PMA13/RB10
55
SEG26/AN20/C3INA/U5RTS/U5BCLK/OC5/RD7
24
TDO/AN11/REFI1/SS4/FSYNC4/PMA12/RB11
56
VCAP
25
VSS
57
VBAT
26
VDD
58
SEG27/U5CTS/OC6/RF0
27
TCK/SEG18/AN12/CTED2/PMA11/RB12
59
COM4/SEG47/SCK4/RF1
28
TDI/SEG19/AN13/SDI4/CTED1/PMA10/RB13
60
COM3/PMD0/RE0
29
SEG8/AN14/RP14/CTED5/CTPLS/PMA1/PMALH/RB14
61
COM2/PMD1/RE1
30
SEG9/AN15/RP29/CTED6/PMA0/PMALL/RB15
62
COM1/PMD2/RE2
31
SEG10/RP10/SDA2/PMA9/RF4
63
COM0/CTED9/PMD3/RE3
32
SEG11/RP17/SCL2/PMA8/RF5
64
SEG62/LVDIN/CTED8/PMD4/RE4
Legend: RPn and RPIn represent remappable pins for Peripheral Pin Select functions.
DS30010089C-page 6
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
Pin Diagrams (Continued)
100
99
98
97
96
95
94
93
92
91
90
89
88
87
86
85
84
83
82
81
80
79
78
77
76
RE4
RE3
RE2
RG13
RG12
RG14
RE1
RE0
RA7
RA6
RG0
RG1
RF1
RF0
VBAT
VCAP
RD7
RD6
RD5
RD4
RD13
RD12
RD3
RD2
RD1
100-Pin TQFP
RG15
1
75
VSS
VDD
2
74
SOSCO/RC14
RE5
3
73
SOSCI/RC13
RE6
4
72
RE7
5
71
RD0
RD11
RC1
6
70
RD10
RC2
7
69
RD9
RC3
8
68
RD8
RC4
9
67
RA15
RG6
10
66
RA14
RG7
11
65
RG8
12
64
VSS
OSCO/RC15
MCLR
13
63
OSCI/CLKI/RC12
RG9
14
62
VDD
VSS
15
61
RA5
VDD
16
60
RA4
RA0
17
59
RA3
RE8
18
58
RA2
RE9
19
57
RG2
RB5
20
56
RG3
RB4
21
55
RF6
RB3
22
54
RF7
RB2
23
RF8
RB1
53
24
RF2
RB0
52
25
51
RF3
RB6
RB7
RA9
RA10
AVDD
AVSS
RB8
RB9
RB10
RB11
VSS
VDD
RA1
RF13
RF12
RB12
RB13
RB14
RB15
VSS
VDD
RD14
RD15
RF4
RF5
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
PIC24FJXXXGA410
Legend: Shaded pins indicate pins tolerant to up to +5.5 VDC. See Table 3 for a complete description of pin functions.
 2015 Microchip Technology Inc.
DS30010089C-page 7
PIC24FJ256GA412/GB412 FAMILY
TABLE 3:
COMPLETE PIN FUNCTION DESCRIPTIONS FOR PIC24FJXXXGA410 DEVICES
Pin
Function
Pin
Function
1
SEG50/OCM1C/CTED3/RG15
51
SEG12/RP16/RF3
2
VDD
52
SEG40/RP30/IOCF2/RF2
3
LCDBIAS2/IC4/CTED4/PMD5/RE5
53
SEG41/RP15/IOCF8/RF8
4
LCDBIAS1/SCL3/IC5/PMD6/RE6
54
RF7
5
LCDBIAS0/SDA3/IC6/PMD7/RE7
55
RF6
6
SEG32/RPI38/OCM1D/RC1
56
SDA1/RG3
7
SEG51/RPI39/RC2
57
SCL1/RG2
8
SEG33/RPI40/RC3
58
SEG55/SCL2/RA2
9
SEG52/AN16/RPI41/PMCS2/RC4
59
SEG56/SDA2/PMA20/RA3
10
SEG0/AN17/C1IND/RP21/ICM1/OCM1A/PMA5/RG6
60
TDI/PMA21/RA4
11
VLCAP1/AN18/C1INC/RP26/OCM1B/PMA4/RG7
61
TDO/SEG28/RA5
12
VLCAP2/AN19/C2IND/RP19/ICM2/OCM2A/PMA3/RG8
62
VDD
OSCI/CLKI/RC12
13
MCLR
63
14
SEG1/AN21/C1INC/C2INC/C3INC/RP27/DAC1/PMA2/PMALU/RG9
64
OSCO/EOSCEN/CLKO/RC15
15
VSS
65
VSS
16
VDD
66
SEG42/RPIN36/PMA22/RA14
17
TMS/SEG48/CTED14/RA0
67
SEG43/RPIN35/PMBE1/RA15
SEG13/CLC4OUT/RP2/RTCC/U6RTS/U6BCLK/ICM5/RD8
18
SEG34/RPI33/PMCS1/RE8
68
19
SEG35/RPI34/PMA19/RE9
69
SEG14/AN22/RP4/PMACK2/RD9
20
PGEC3/SEG2/AN5/C1INA/RP18/ICM3/OCM3A/RB5
70
SEG15/C3IND/RP3/PMA15/PMCS2/RD10
21
PGED3/SEG3/AN4/C1INB/RP28/RB4
71
SEG16/C3INC/RP12/PMA14/PMCS/PMCS1/RD11
22
SEG4/AN1-/AN3/C2INA/RB3
72
SEG17/CLC3OUT/RP11/U6CTS/ICM6/INT0/RD0
23
SEG5/AN2/CTCMP/C2INB/RP13/CTED13/RB2
73
SOSCI/RC13
24
PGEC1/SEG6/VREF-/CVREF-/AN1/AN1-/RP1/CTED12/RB1
74
SOSCO/SCLKI/RPI37/PWRLCLK/RC14
25
PGED1/SEG7/VREF+/CVREF+/DVREF+/AN0/RP0/RB0
75
VSS
26
PGEC2/LCDBIAS3/AN6/RP6/RB6
76
SEG20/RP24/U5TX/ICM4/RD1
27
PGED2/SEG63/AN7/RP7/U6TX/RB7
77
SEG21/AN23/RP23/PMACK1/RD2
28
SEG36/VREF-/CVREF-/PMA7/RA9
78
SEG22/RP22/ICM7/PMBE0/RD3
29
SEG37/VREF+/CVREF+/DVREF+/PMA6/RA10
79
SEG44/RPI42/PMD12/RD12
30
AVREF+/DVREF+
80
SEG45/PMD13/RD13
31
AVREF-/DVREF-
81
SEG23/RP25/PMWR/PMENB/RD4
32
COM7/SEG31/AN8/RP8/RB8
82
SEG24/RP20/PMRD/PMWR/RD5
33
COM6/SEG30/AN9/TMPR/RP9/PMA7/RB9
83
SEG25/C3INB/U5RX/OC4/PMD14/RD6
34
COM5/SEG29/CVREF/AN10/SDO4/PMA13/RB10
84
SEG26/AN20/C3INA/U5RTS/U5BCLK/OC5/PMD15/RD7
35
AN11/REFI1/SS4/FSYNC4/PMA12/RB11
85
VCAP
36
VSS
86
VBAT
37
VDD
87
SEG27/U5CTS/OC6/PMD11/RF0
38
TCK/RA1
88
COM4/SEG47/SCK4/PMD10/RF1
39
SEG53/RP31/RF13
89
SEG46/PMD9/RG1
40
SEG54/RPI32/CTED7/PMA18/RF12
90
SEG49/PMD8/RG0
41
SEG18/AN12/U6RX/CTED2/PMA11/RB12
91
SEG57/AN23/OCM1E/RA6
42
SEG19/AN13/SDI4/CTED1/PMA10/RB13
92
SEG58/AN22/OCM1F/PMA17/RA7
43
SEG8/AN14/RP14/CTED5/CTPLS/PMA1/PMALH/RB14
93
COM3/PMD0/RE0
44
SEG9/AN15/RP29/CTED6/PMA0/PMALL/RB15
94
COM2/PMD1/RE1
45
VSS
95
SEG59/CTED11/PMA16/RG14
46
VDD
96
SEG60/RG12
47
SEG38/RPI43/RD14
97
SEG61/CTED10/RG13
48
SEG39/RP5/RD15
98
COM1/PMD2/RE2
49
SEG10/RP10/PMA9/RF4
99
COM0/CTED9/PMD3/RE3
50
SEG11/RP17/PMA8/RF5
100
SEG62/LVDIN/CTED8/PMD4/RE4
Legend: RPn and RPIn represent remappable pins for Peripheral Pin Select functions.
DS30010089C-page 8
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
Pin Diagrams (Continued)
100
99
98
97
96
95
94
93
92
91
90
89
88
87
86
85
84
83
82
81
80
79
78
77
76
RE4
RE3
RE2
RG13
RG12
RG14
RE1
RE0
RA7
RA6
RG0
RG1
RF1
RF0
VBA
VCAP
RD7
RD6
RD5
RD4
RD13
RD12
RD3
RD2
RD1
100-Pin TQFP
RG15
1
75
VSS
VDD
2
74
SOSCO/RC14
RE5
3
73
SOSCI/RC13
RE6
4
72
RE7
5
71
RD0
RD11
RC1
6
70
RD10
RC2
7
69
RD9
RC3
8
68
RD8
RC4
9
67
RA15
RG6
10
66
RA14
RG7
11
65
RG8
12
64
VSS
OSCO/RC15
MCLR
13
63
OSCI/CLKI/RC12
RG9
14
62
VDD
VSS
15
61
RA5
PIC24FJXXXGB410
16
60
RA4
17
59
RA3
RE8
18
58
RA2
RE9
19
57
D+/RG2
RB5
20
56
D-/RG3
RB4
21
55
VUSB3V3
RB3
22
54
VBUS/RF7
RB2
23
53
RF8
RB1
24
RF2
RB0
52
25
51
RF3
RB6
RB7
RA9
RA10
AVDD
AVSS
RB8
RB9
RB10
RB11
VSS
VDD
RA1
RF13
RF12
RB12
RB13
RB14
RB15
VSS
VDD
RD14
RD15
RF4
RF5
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
VDD
RA0
Legend: Shaded pins indicate pins tolerant to up to +5.5 VDC. See Table 4 for a complete description of pin functions.
 2015 Microchip Technology Inc.
DS30010089C-page 9
PIC24FJ256GA412/GB412 FAMILY
TABLE 4:
COMPLETE PIN FUNCTION DESCRIPTIONS FOR PIC24FJXXXGB410 DEVICES
Pin
Function
Pin
Function
1
SEG50/OCM1C/CTED3/RG15
51
SEG12/RP16/USBID/RF3
2
VDD
52
SEG40/RP30/IOCF2/RF2
3
LCDBIAS2/IC4/CTED4/PMD5/RE5
53
SEG41/RP15/IOCF8/RF8
4
LCDBIAS1/SCL3/IC5/PMD6/RE6
54
VBUS/RF7
5
LCDBIAS0/SDA3/IC6/PMD7/RE7
55
VUSB3V3
6
SEG32/RPI38/OCM1D/RC1
56
D-/RG3
D+/RG2
7
SEG51/RPI39/RC2
57
8
SEG33/RPI40/RC3
58
SEG55/SCL2/RA2
9
SEG52/AN16/RPI41/PMCS2/RC4
59
SEG56/SDA2/PMA20/RA3
10
SEG0/AN17/C1IND/RP21/ICM1/OCM1A/PMA5/RG6
60
TDI/PMA21/RA4
11
VLCAP1/AN18/C1INC/RP26/OCM1B/PMA4/RG7
61
TDO/SEG28/RA5
12
VLCAP2/AN19/C2IND/RP19/ICM2/OCM2A/PMA3/RG8
62
VDD
OSCI/CLKI/RC12
13
MCLR
63
14
SEG1/AN21/C1INC/C2INC/C3INC/RP27/DAC1/PMA2/PMALU/RG9
64
OSCO/EOSCEN/CLKO/RC15
15
VSS
65
VSS
SEG42/RPI36/SCL1/PMA22/RA14
16
VDD
66
17
TMS/SEG48/CTED14/RA0
67
SEG43/RPI35/SDA1/PMBE1/RA15
18
SEG34/RPI33/PMCS1/RE8
68
SEG13/CLC4OUT/RP2/RTCC/U6RTS/U6BCLK/ICM5/RD8
19
SEG35/RPI34/PMA19/RE9
69
SEG14/AN22/RP4/PMACK2/RD9
20
PGEC3/SEG2/AN5/C1INA/RP18/ICM3/OCM3A/RB5
70
SEG15/C3IND/RP3/PMA15/PMCS2/RD10
21
PGED3/SEG3/AN4/C1INB/RP28/USBOE/RB4
71
SEG16/C3INC/RP12/PMA14/PMCS/PMCS1/RD11
22
SEG4/AN1-/AN3/C2INA/RB3
72
SEG17/CLC3OUT/RP11/U6CTS/ICM6/INT0/RD0
23
SEG5/AN2/CTCMP/C2INB/RP13/CTED13/RB2
73
SOSCI/RC13
24
PGEC1/SEG6/VREF-/CVREF-/AN1/AN1-/RP1/CTED12/RB1
74
SOSCO/SCLKI/RPI37/PWRLCLK/RC14
25
PGED1/SEG7/VREF+/CVREF+/DVREF+/AN0/RP0/RB0
75
VSS
26
PGEC2/LCDBIAS3/AN6/RP6/RB6
76
SEG20/RP24/U5TX/ICM4/RD1
27
PGED2/SEG63/AN7/RP7/U6TX/RB7
77
SEG21/AN23/RP23/PMACK1/RD2
SEG22/RP22/ICM7/PMBE0/RD3
28
SEG36/VREF-/CVREF-/PMA7/RA9
78
29
SEG37/VREF+/CVREF+/DVREF+/PMA6/RA10
79
SEG44/RPI42/PMD12/RD12
30
AVREF+/DVREF+
80
SEG45/PMD13/RD13
31
AVREF-/DVREF-
81
SEG23/RP25/PMWR/PMENB/RD4
32
COM7/SEG31/AN8/RP8/RB8
82
SEG24/RP20/PMRD/PMWR/RD5
33
COM6/SEG30/AN9/TMPR/RP9/PMA7/RB9
83
SEG25/C3INB/U5RX/OC4/PMD14/RD6
34
COM5/SEG29/CVREF/AN10/SDO4/PMA13/RB10
84
SEG26/AN20/C3INA/U5RTS/U5BCLK/OC5/PMD15/RD7
35
AN11/REFI1/SS4/FSYNC4/PMA12/RB11
85
VCAP
36
VSS
86
VBAT
37
VDD
87
SEG27/U5CTS/OC6/PMD11/RF0
38
TCK/RA1
88
COM4/SEG47/SCK4/PMD10/RF1
39
SEG53/RP31/RF13
89
SEG46/PMD9/RG1
40
SEG54/RPI32/CTED7/PMA18/RF12
90
SEG49/PMD8/RG0
41
SEG18/AN12/U6RX/CTED2/PMA11/RB12
91
SEG57/AN23/OCM1E/RA6
42
SEG19/AN13/SDI4/CTED1/PMA10/RB13
92
SEG58/AN22/OCM1F/PMA17/RA7
43
SEG8/AN14/RP14/CTED5/CTPLS/PMA1/PMALH/RB14
93
COM3/PMD0/RE0
44
SEG9/AN15/RP29/CTED6/PMA0/PMALL/RB15
94
COM2/PMD1/RE1
45
VSS
95
SEG59/CTED11/PMA16/RG14
46
VDD
96
SEG60/RG12
47
SEG38/RPI43/RD14
97
SEG61/CTED10/RG13
48
SEG39/RP5/RD15
98
COM1/PMD2/RE2
49
SEG10/RP10/PMA9/RF4
99
COM0/CTED9/PMD3/RE3
50
SEG11/RP17/PMA8/RF5
100
SEG62/LVDIN/CTED8/PMD4/RE4
Legend: RPn and RPIn represent remappable pins for Peripheral Pin Select functions.
DS30010089C-page 10
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
Pin Diagrams (Continued)
PIC24FJXXXGA412, 121-Pin TFBGA
1
2
3
4
5
6
7
8
9
10
11
A
RE4
RE3
RG13
RE0
RG0
RF1
VBAT
RH14
RD12
RD2
RD1
B
RH1
RG15
RE2
RE1
RA7
RF0
VCAP
RD5
RD3
VSS
RC14
C
RE6
VDD
RG12
RG14
RA6
VSS
RD7
RD4
RH13
RC13
RD11
D
RC1
RE7
RE5
RH2
RJ0
VDD
RD6
RD13
RD0
VSS
RD10
E
RC4
RC3
RG6
RC2
RJ1
RG1
VDD
RA15
RD8
RD9
RA14
F
MCLR
RG8
RG9
RG7
VSS
RH15
RH12
VDD
OSCI/RC12
VSS
OSCO/RC15
G
RE8
RE9
RA0
RH3
VDD
VSS
VSS
RH11
RA5
RA3
RA4
H
RB5
RB4
RH4
RH5
RB10
VDD
RH8
RF7
RF6
RG2
RA2
J
RB3
RB2
RB7
AVDD
RH7
RA1
RB12
RH9
RH10
RF8
RG3
K
RB1
RB0
RA10
RB8
RB11
RF12
RB14
VDD
RD15
RF3
RF2
L
RB6
RA9
AVSS
RB9
RH6
RF13
RB13
RB15
RD14
RF4
RF5
Legend: Shaded balls indicate pins tolerant to up to +5.5 VDC. See Table 5 for a complete description of pin functions.
 2015 Microchip Technology Inc.
DS30010089C-page 11
PIC24FJ256GA412/GB412 FAMILY
TABLE 5:
COMPLETE PIN FUNCTION DESCRIPTIONS FOR PIC24FJXXXGA412
Pin
Function
Pin
Function
A1
SEG62/LVDIN/CTED8/PMD4/RE4
E1
A2
COM0/CTED9/PMD3/RE3
E2
SEG52/AN16/RPIN41/OCM3C/PMCS2/RC4
SEG33/RPI40/OCM2D/RC3
A3
SEG61/CTED10/RG13
E3
SEG0/AN17/C1IND/RP21/ICM1/OCM1A/PMA5/RG6
A4
COM3/PMD0/RE0
E4
SEG51/RPI39/OCM2C/RC2
A5
SEG49/PMD8/RG0
E5
RJ1
A6
SEG47/SCK4/PMD10/RF1
E6
SEG46/PMD9/RG1
A7
VBAT
E7
VDD
A8
RH14
E8
SEG43/RPI35/PMBE1/RA15
A9
SEG44/RPI42/PMD12/RD12
E9
SEG13/CLC4OUT/RP2/RTCC/U6RTS/U6BCLK/ICM5/RD8
A10
SEG21/RP23/PMACK1/RD2
E10
SEG14/RP4/PMPACK2/IOCD9/RD9
A11
SEG20/RP24/U5TX/ICM4/RD1
E11
SEG42/RPI36/PMA22/RA14
B1
COM4/RH1
F1
MCLR
B2
SEG50/OCM1C/CTED3/RG15
F2
VLCAP2/AN19/C2IND/RP19/ICM2/OCM2A/PMA3/RG8
B3
COM1/PMD2/RE2
F3
SEG1/AN20/C1INC/C2INC/C3INC/RP27/DAC1/OCM2B/PMA2/
PMALU/RG9
B4
COM2/PMD1/RE1
F4
VLCAP1/AN18/C1INC/RP26/OCM1B/PMA4/RG7
B5
SEG58/AN22/OCM1F/PMA17/RA7
F5
VSS
B6
SEG27/U5CTS/OC6/PMD11/RF0
F6
RH15
B7
VCAP
F7
RH12
B8
SEG24/RP20/PMRD/PMWR/RD5
F8
VDD
B9
SEG22/RP22/ICM7/PMBE0/RD3
F9
OSCI/CLKI/RC12
B10
VSS
F10
VSS
B11
SOSCO/RPI37/PWRLCLK/RC14
F11
OSCO/CLKO/RC15
C1
LCDBIAS1/SCL3/IC5/PMD6/RE6
G1
SEG34/RPI33/PMCS1/RE8
C2
VDD
G2
SEG35/AN21/RPI34/PMA19/RE9
C3
SEG60/RG12
G3
TMS/SEG48/OCM3D/CTED14/RA0
C4
SEG59/CTED11/PMA16/RG14
G4
COM6/RH3
C5
SEG57/AN23/OCM1E/RA6
G5
VDD
C6
VSS
G6
VSS
C7
SEG26/C3INA/U5RTS/U5BCLK/OC5/PMD15/RD7
G7
VSS
C8
SEG23/RP25/PMWR/PMENB/RD4
G8
OCM3F/RH11
C9
RH13
G9
TDO/SEG28/RA5
C10
SOSCI/RC13
G10
SEG56/SDA2/PMA20/RA3
C11
SEG16/C3INC/RP12/PMA14/PMCS/PMCS1/RD11
G11
TDI/PMA21//RA4
D1
SEG32/RPI38/OCM1D/RC1
H1
PGEC3/SEG2/AN5/C1INA/RP18/ICM3/OCM3A/RB5
D2
LCDBIAS0/SDA3/IC6/PMD7/RE7
H2
PGED3/SEG3/AN4/C1INB/RP28/OCM3B/RB4
D3
LCDBIAS2/IC4/CTED4/PMD5/RE5
H3
COM7/RH4
D4
COM5/RH2
H4
OCM1E/RH5
D5
RJ0
H5
SEG29/CVREF/AN10/SDO4/PMA13/RB10
D6
VDD
H6
VDD
D7
SEG25/C3INB/U5RX/OC4/PMD14/RD6
H7
RH8
D8
SEG45/PMD13/RD13
H8
RF7
D9
SEG17/CLC3OUT/RP11/U6CTS/ICM6/INT0/RD0
H9
RF6
D10
VSS
H10
SCL1/RG2
D11
SEG15/C3IND/RP3/PMA15/PMPCS2/RD10
H11
SEG55/SCL2/RA2
Legend: RPn and RPIn represent remappable pins for Peripheral Pin Select functions.
DS30010089C-page 12
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
TABLE 5:
COMPLETE PIN FUNCTION DESCRIPTIONS FOR PIC24FJXXXGA412 (CONTINUED)
Pin
Function
Pin
Function
J1
SEG4/AN3/C2INA/RB3
K7
SEG8/AN14/RP14/CTED5/CTPLS/PMA1/PMALH/RB14
J2
SEG5/AN2/CTCMP/C2INB/RP13/CTED13/RB2
K8
VDD
J3
PGED2/SEG63/AN7/RP7/U6TX/RB7
K9
SEG39/RP5/IOCD15/RD15
J4
AVDD
K10
SEG12/RP16/RF3
J5
OCM2E/RH7
K11
SEG40/RP30/RF2
J6
TCK/RA1
L1
PGEC2/LCDBIAS3/AN6/RP6/RB6
J7
SEG18/AN12/U6RX/CTED2/PMA11/RB12
L2
SEG36/VREF-/CVREF-/PMA7/RA9
J8
OCM2F/RH9
L3
AVSS
J9
OCM3E/RH10
L4
SEG30/AN9/TMPR/RP9/T1CK/PMA7/RB9
J10
SEG41/RP15/RF8
L5
OCM1F/RH6
J11
SDA1/RG3
L6
SEG53/RP31/RF13
K1
PGEC1/SEG6/VREF-/CVREF-/AN1/AN1-/RP1/CTED12/RB1
L7
SEG19/AN13/SDI4/CTED1/PMA10/RB13
K2
PGED1/SEG7/VREF+/CVREF+/DVREF+/AN0/RP0/RB0
L8
SEG9/AN15/RP29/CTED6/PMA0/PMALL/RB15
SEG38/RPI43/RD14
K3
SEG37/VREF+/CVREF+/DVREF+/PMA6/RA10
L9
K4
SEG31/AN8/RP8/PWRGT/RB8
L10
SEG10/RP10/PMA9/RF4
K5
AN11/REFI1/SS4/FSYNC4/PMA12/RB11
L11
SEG11/RP17/PMA8/RF5
K6
SEG54/RPI32/CTED7/PMPA18/RF12
Legend: RPn and RPIn represent remappable pins for Peripheral Pin Select functions.
 2015 Microchip Technology Inc.
DS30010089C-page 13
PIC24FJ256GA412/GB412 FAMILY
Pin Diagrams (Continued)
PIC24FJXXXGB412, 121-Pin TFBGA
1
2
A
RE4
RE3
B
RH1
C
3
4
5
RG13
RE0
RG0
RG15
RE2
RE1
RE6
VDD
RG12
D
RC1
RE7
E
RC4
F
6
7
8
9
10
11
RF1
VBAT
RH14
RD12
RD2
RD1
RA7
RF0
VCAP
RD5
RD3
VSS
RC14
RG14
RA6
VSS
RD7
RD4
RH13
RC13
RD11
RE5
RH2
RJ0
VDD
RD6
RD13
RD0
VSS
RD10
RC3
RG6
RC2
RJ1
RG1
VDD
RA15
RD8
RD9
RA14
MCLR
RG8
RG9
RG7
VSS
RH15
RH12
VDD
OSCI/RC12
VSS
OSCO/RC15
G
RE8
RE9
RA0
RH3
VDD
VSS
VSS
RH11
RA5
RA3
RA4
H
RB5
RB4
RH4
RH5
RB10
VDD
RH8
VBUS/RF7
VUSB3V3
D+/RG2
RA2
J
RB3
RB2
RB7
AVDD
RH7
RA1
RB12
RH9
RH10
RF8
D-/RG3
K
RB1
RB0
RA10
RB8
RB11
RF12
RB14
VDD
RD15
RF3
RF2
L
RB6
RA9
AVSS
RB9
RH6
RF13
RB13
RB15
RD14
RF4
RF5
Legend: Shaded balls indicate pins tolerant to up to +5.5 VDC. See Table 6 for a complete description of pin functions.
DS30010089C-page 14
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
TABLE 6:
COMPLETE PIN FUNCTION DESCRIPTIONS FOR PIC24FJXXXGB412
Pin
Function
Pin
Function
A1
SEG62/LVDIN/CTED8/PMD4/RE4
E1
A2
COM0/CTED9/PMD3/RE3
E2
SEG52/AN16/RPIN41/OCM3C/PMCS2/RC4
SEG33/RPI40/OCM2D/RC3
A3
SEG61/CTED10/RG13
E3
SEG0/AN17/C1IND/RP21/ICM1/OCM1A/PMA5/RG6
A4
COM3/PMD0/RE0
E4
SEG51/RPI39/OCM2C/RC2
A5
SEG49/PMD8/RG0
E5
RJ1
A6
SEG47/SCK4/PMD10/RF1
E6
SEG46/PMD9/RG1
A7
VBAT
E7
VDD
A8
RH14
E8
SEG43/RPI35/SDA1/PMBE1/RA15
A9
SEG44/RPI42/PMD12/RD12
E9
SEG13/CLC4OUT/RP2/RTCC/U6RTS/U6BCLK/ICM5/RD8
A10
SEG21/RP23/PMACK1/RD2
E10
SEG14/RP4/PMPACK2/IOCD9/RD9
A11
SEG20/RP24/U5TX/ICM4/RD1
E11
SEG42/RPI36/SCL1/PMA22/RA14
B1
COM4/RH1
F1
MCLR
B2
SEG50/OCM1C/CTED3/RG15
F2
VLCAP2/AN19/C2IND/RP19/ICM2/OCM2A/PMA3/RG8
B3
COM1/PMD2/RE2
F3
SEG1/AN20/C1INC/C2INC/C3INC/RP27/DAC1/OCM2B/PMA2/
PMALU/RG9
VLCAP1/AN18/C1INC/RP26/OCM1B/PMA4/RG7
B4
COM2/PMD1/RE1
F4
B5
SEG58/AN22/OCM1F/PMA17/RA7
F5
VSS
B6
SEG27/U5CTS/OC6/PMD11/RF0
F6
RH15
B7
VCAP
F7
RH12
B8
SEG24/RP20/PMRD/PMWR/RD5
F8
VDD
OSCI/CLKI/RC12
B9
SEG22/RP22/ICM7/PMBE0/RD3
F9
B10
VSS
F10
VSS
B11
SOSCO/RPI37/PWRLCLK/RC14
F11
OSCO/CLKO/RC15
C1
LCDBIAS1/SCL3/IC5/PMD6/RE6
G1
SEG34/RPI33/PMCS1/RE8
C2
VDD
G2
SEG35/AN21/RPI34/PMA19/RE9
C3
SEG60/RG12
G3
TMS/SEG48/OCM3D/CTED14/RA0
C4
SEG59/CTED11/PMA16/RG14
G4
COM6/RH3
C5
SEG57/AN23/OCM1E/RA6
G5
VDD
C6
VSS
G6
VSS
C7
SEG26/C3INA/U5RTS/U5BCLK/OC5/PMD15/RD7
G7
VSS
C8
SEG23/RP25/PMWR/PMENB/RD4
G8
OCM3F/RH11
TDO/SEG28/RA5
C9
RH13
G9
C10
SOSCI/RC13
G10
SEG56/SDA2/PMA20/RA3
C11
SEG16/C3INC/RP12/PMA14/PMCS/PMCS1/RD11
G11
TDI/PMA21//RA4
D1
SEG32/RPI38/OCM1D/RC1
H1
PGEC3/SEG2/AN5/C1INA/RP18/ICM3/OCM3A/RB5
D2
LCDBIAS0/SDA3/IC6/PMD7/RE7
H2
PGED3/SEG3/AN4/C1INB/RP28/USBOE/OCM3B/RB4
D3
LCDBIAS2/IC4/CTED4/PMD5/RE5
H3
COM7/RH4
D4
COM5/RH2
H4
OCM1E/RH5
D5
RJ0
H5
SEG29/CVREF/AN10/SDO4/PMA13/RB10
D6
VDD
H6
VDD
D7
SEG25/C3INB/U5RX/OC4/PMD14/RD6
H7
RH8
D8
SEG45/PMD13/RD13
H8
VBUS/RF7
D9
SEG17/CLC3OUT/RP11/U6CTS/ICM6/INT0/RD0
H9
VUSB3V3
D10
VSS
H10
D+/RG2
D11
SEG15/C3IND/RP3/PMA15/PMPCS2/RD10
H11
SEG55/SCL2/RA2
Legend: RPn and RPIn represent remappable pins for Peripheral Pin Select functions.
 2015 Microchip Technology Inc.
DS30010089C-page 15
PIC24FJ256GA412/GB412 FAMILY
TABLE 6:
COMPLETE PIN FUNCTION DESCRIPTIONS FOR PIC24FJXXXGB412 (CONTINUED)
Pin
Function
Pin
Function
J1
SEG4/AN3/C2INA/RB3
K7
SEG8/AN14/RP14/CTED5/CTPLS/PMA1/PMALH/RB14
J2
SEG5/AN2/CTCMP/C2INB/RP13/CTED13/RB2
K8
VDD
J3
PGED2/SEG63/AN7/RP7/U6TX/RB7
K9
SEG39/RP5/IOCD15/RD15
J4
AVDD
K10
SEG12/RP16/USBID/RF3
SEG40/RP30/RF2
J5
OCM2E/RH7
K11
J6
TCK/RA1
L1
PGEC2/LCDBIAS3/AN6/RP6/RB6
J7
SEG18/AN12/U6RX/CTED2/PMA11/RB12
L2
SEG36/VREF-/CVREF-/PMA7/RA9
J8
OCM2F/RH9
L3
AVSS
J9
OCM3E/RH10
L4
SEG30/AN9/TMPR/RP9/T1CK/PMA7/RB9
J10
SEG41/RP15/RF8
L5
OCM1F/RH6
J11
D-/RG3
L6
SEG53/RP31/RF13
K1
PGEC1/SEG6/VREF-/CVREF-/AN1/AN1-/RP1/CTED12/RB1
L7
SEG19/AN13/SDI4/CTED1/PMA10/RB13
K2
PGED1/SEG7/VREF+/CVREF+/DVREF+/AN0/RP0/RB0
L8
SEG9/AN15/RP29/CTED6/PMA0/PMALL/RB15
K3
SEG37/VREF+/CVREF+/DVREF+/PMA6/RA10
L9
SEG38/RPI43/RD14
K4
SEG31/AN8/RP8/PWRGT/RB8
L10
SEG10/RP10/PMA9/RF4
K5
AN11/REFI1/SS4/FSYNC4/PMA12/RB11
L11
SEG11/RP17/PMA8/RF5
K6
SEG54/RPI32/CTED7/PMPA18/RF12
Legend: RPn and RPIn represent remappable pins for Peripheral Pin Select functions.
DS30010089C-page 16
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
Table of Contents
1.0 Device Overview ........................................................................................................................................................................ 19
2.0 Guidelines for Getting Started with 16-Bit Microcontrollers........................................................................................................ 51
3.0 CPU............................................................................................................................................................................................ 57
4.0 Memory Organization ................................................................................................................................................................. 63
5.0 Direct Memory Access Controller (DMA) ................................................................................................................................... 89
6.0 Flash Program Memory.............................................................................................................................................................. 97
7.0 Resets ...................................................................................................................................................................................... 101
8.0 Interrupt Controller ................................................................................................................................................................... 107
9.0 Oscillator Configuration ............................................................................................................................................................ 177
10.0 Power-Saving Features............................................................................................................................................................ 191
11.0 I/O Ports ................................................................................................................................................................................... 209
12.0 Timer1 ...................................................................................................................................................................................... 243
13.0 Timer2/3 and Timer4/5 ............................................................................................................................................................ 247
14.0 Capture/Compare/PWM/Timer Modules (MCCP and SCCP) .................................................................................................. 253
15.0 Input Capture with Dedicated Timers ....................................................................................................................................... 269
16.0 Output Compare with Dedicated Timers .................................................................................................................................. 275
17.0 Serial Peripheral Interface (SPI)............................................................................................................................................... 285
18.0 Inter-Integrated Circuit (I2C) ..................................................................................................................................................... 301
19.0 Universal Asynchronous Receiver Transmitter (UART) ........................................................................................................... 309
20.0 Universal Serial Bus with On-The-Go Support (USB OTG) ..................................................................................................... 323
21.0 Enhanced Parallel Master Port (EPMP) ................................................................................................................................... 357
22.0 Liquid Crystal Display (LCD) Controller.................................................................................................................................... 369
23.0 Configurable Logic Cell (CLC).................................................................................................................................................. 377
24.0 Real-Time Clock and Calendar (RTCC) with Timestamp......................................................................................................... 387
25.0 Cryptographic Engine............................................................................................................................................................... 399
26.0 32-Bit Programmable Cyclic Redundancy Check (CRC) Generator ....................................................................................... 417
27.0 12-Bit A/D Converter with Threshold Detect ............................................................................................................................ 423
28.0 10-Bit Digital-to-Analog Converter (DAC)................................................................................................................................. 441
29.0 Triple Comparator Module........................................................................................................................................................ 445
30.0 Comparator Voltage Reference................................................................................................................................................ 451
31.0 Charge Time Measurement Unit (CTMU) ................................................................................................................................ 453
32.0 High/Low-Voltage Detect (HLVD)............................................................................................................................................. 461
33.0 Special Features ...................................................................................................................................................................... 463
34.0 Development Support............................................................................................................................................................... 483
35.0 Instruction Set Summary .......................................................................................................................................................... 487
36.0 Electrical Characteristics .......................................................................................................................................................... 495
37.0 Packaging Information.............................................................................................................................................................. 525
Appendix A: Revision History............................................................................................................................................................. 539
Index ................................................................................................................................................................................................. 541
The Microchip Web Site ..................................................................................................................................................................... 549
Customer Change Notification Service .............................................................................................................................................. 549
Customer Support .............................................................................................................................................................................. 549
Product Identification System ............................................................................................................................................................ 551
 2015 Microchip Technology Inc.
DS30010089C-page 17
PIC24FJ256GA412/GB412 FAMILY
TO OUR VALUED CUSTOMERS
It is our intention to provide our valued customers with the best documentation possible to ensure successful use of your Microchip
products. To this end, we will continue to improve our publications to better suit your needs. Our publications will be refined and
enhanced as new volumes and updates are introduced.
If you have any questions or comments regarding this publication, please contact the Marketing Communications Department via
E-mail at [email protected]. We welcome your feedback.
Most Current Data Sheet
To obtain the most up-to-date version of this data sheet, please register at our Worldwide Web site at:
http://www.microchip.com
You can determine the version of a data sheet by examining its literature number found on the bottom outside corner of any page.
The last character of the literature number is the version number, (e.g., DS30000000A is version A of document DS30000000).
Errata
An errata sheet, describing minor operational differences from the data sheet and recommended workarounds, may exist for current
devices. As device/documentation issues become known to us, we will publish an errata sheet. The errata will specify the revision
of silicon and revision of document to which it applies.
To determine if an errata sheet exists for a particular device, please check with one of the following:
• Microchip’s Worldwide Web site; http://www.microchip.com
• Your local Microchip sales office (see last page)
When contacting a sales office, please specify which device, revision of silicon and data sheet (include literature number) you are
using.
Customer Notification System
Register on our web site at www.microchip.com to receive the most current information on all of our products.
DS30010089C-page 18
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
1.0
DEVICE OVERVIEW
This document contains device-specific information for
the following devices:
• PIC24FJ64GA406
• PIC24FJ64GB406
• PIC24FJ128GA406
• PIC24FJ128GB406
• PIC24FJ256GA406
• PIC24FJ256GB406
• PIC24FJ64GA410
• PIC24FJ64GB410
• PIC24FJ128GA410
• PIC24FJ128GB410
• PIC24FJ256GA410
• PIC24FJ256GB410
• PIC24FJ64GA412
• PIC24FJ64GB412
• PIC24FJ128GA412
• PIC24FJ128GB412
• PIC24FJ256GA412
• PIC24FJ256GB412
The PIC24FJ256GA412/GB412 family expands the
capabilities of the PIC24F family by adding a complete
selection of advanced analog peripherals to its existing
digital features. This combination, along with its ultra
low-power features, Direct Memory Access (DMA) for
peripherals, USB On-The-Go (OTG) and a built-in LCD
Controller and driver, makes this family the new
standard for mixed-signal PIC® microcontrollers in one
economical and power-saving package.
1.1
1.1.1
Core Features
16-BIT ARCHITECTURE
Central to all PIC24F devices is the 16-bit modified
Harvard architecture, first introduced with Microchip’s
dsPIC® Digital Signal Controllers (DSCs). The PIC24F
CPU core offers a wide range of enhancements, such as:
• 16-bit data and 24-bit address paths with the
ability to move information between data and
memory spaces
• Linear addressing of up to 12 Mbytes (program
space) and 32 Kbytes (data)
• A 16-element Working register array with built-in
software stack support
• A 17 x 17 hardware multiplier with support for
integer math
• Hardware support for 32 by 16-bit division
• An instruction set that supports multiple
addressing modes and is optimized for high-level
languages, such as ‘C’
• Operational performance up to 16 MIPS
1.1.2
XLP POWER-SAVING TECHNOLOGY
The PIC24FJ256GA412/GB412 family of devices
incorporates a greatly expanded range of power-saving
operating modes for the ultimate in power conservation.
The new modes include:
• Retention Sleep, with essential circuits being
powered from a separate low-voltage regulator
• Deep Sleep without RTCC, for the lowest possible
power consumption under software control
• VBAT mode (with or without RTCC), to continue
limited operation from a backup battery when VDD
is removed
Many of these new low-power modes also support the
continuous operation of the low-power, on-chip
Real-Time Clock/Calendar (RTCC), making it possible
for an application to keep time while the device is
otherwise asleep.
Aside from these new features, the PIC24FJ256GA412/
GB412 devices also include all of the legacy
power-saving features of previous PIC24F
microcontrollers, such as:
• On-the-Fly Clock Switching, allowing the selection
of a lower power clock during run time
• Doze Mode Operation, for maintaining peripheral
clock speed while slowing the CPU clock
• Instruction-Based Power-Saving Modes, for quick
invocation of Idle and the many Sleep modes
1.1.3
DUAL PARTITION FLASH
PROGRAM MEMORY
A brand new feature to the PIC24F family is the use of
Dual Partition Flash program memory technology. This
allows PIC24FJ256GA412/GB412 family devices a
range of new operating options not available before:
• Dual Partition Operation, which can store
two different applications in their own code
partition, and allows for the support of robust
bootloader applications and enhanced security
• Live Update Operation, which allows the main
application to continue operation while the second
Flash partition is being reprogrammed – all
without adding Wait states to code execution
• Direct Run-Time Programming from Data RAM,
with the option of data compression in the RAM
image
PIC24FJ256GA412/GB412 family devices can also
operate with their two Flash partitions as one large program memory, providing space for large and complex
applications.
 2015 Microchip Technology Inc.
DS30010089C-page 19
PIC24FJ256GA412/GB412 FAMILY
1.1.4
OSCILLATOR OPTIONS AND
FEATURES
All of the devices in the PIC24FJ256GA412/GB412
family offer five different oscillator options, allowing
users a range of choices in developing application
hardware. These include:
• Two Crystal modes
• Two External Clock modes
• A Phase-Locked Loop (PLL) frequency multiplier,
which allows clock speeds of up to 32 MHz
• A Fast Internal Oscillator (FRC) – nominal 8 MHz
output with multiple frequency divider options and
automatic frequency self-calibration during run
time
• A separate Low-Power Internal RC Oscillator
(LPRC) – 31 kHz nominal for low-power,
timing-insensitive applications.
The internal oscillator block also provides a stable
reference source for the Fail-Safe Clock Monitor
(FSCM). This option constantly monitors the main clock
source against a reference signal provided by the internal oscillator and enables the controller to switch to the
internal oscillator, allowing for continued low-speed
operation or a safe application shutdown.
1.1.5
EASY MIGRATION
Regardless of the memory size, all devices share the
same rich set of peripherals, allowing for a smooth
migration path as applications grow and evolve. This
extends the ability of applications to grow from the
relatively simple, to the powerful and complex, while
still selecting a Microchip device.
1.2
Cryptographic Engine
The Cryptographic Engine provides a new set of data
security options. Using its own free-standing math
engine, the module can independently perform
NIST standard encryption and decryption of data,
independently of the CPU. The Cryptographic Engine
supports AES and DES/3DES encryption ciphers in up to
5 modes, and supports key lengths from 128 to 256 bits.
Additional features include True Random Number
Generation (TRNG) within the engine, multiple encryption/decryption key storage options and secure data
handling that prevents data in the engine from being
compromised by external reads.
DS30010089C-page 20
1.3
USB On-The-Go (OTG)
USB On-The-Go provides on-chip functionality as a
target device compatible with the USB 2.0 standard, as
well as limited stand-alone functionality as a USB
embedded host. By implementing USB Host Negotiation Protocol (HNP), the module can also dynamically
switch between device and host operation, allowing
for a much wider range of versatile USB-enabled
applications on a microcontroller platform.
PIC24FJ256GA412/GB412 family devices also incorporate an integrated USB transceiver and precision
oscillator, minimizing the required complexity of
implementing a complete USB device, embedded host,
dual role or On-The-Go application.
1.4
DMA Controller
PIC24FJ256GA412/GB412 family devices also add a
Direct Memory Access (DMA) Controller to the existing
PIC24F architecture. The DMA acts in concert with the
CPU, allowing data to move between data memory and
peripherals without the intervention of the CPU,
increasing data throughput and decreasing execution
time overhead. Six independently programmable channels make it possible to service multiple peripherals at
virtually the same time, with each channel peripheral
performing a different operation. Many types of data
transfer operations are supported.
1.5
LCD Controller
The versatile on-chip LCD Controller includes many
features that make the integration of displays in
low-power applications easier. These include an
integrated voltage regulator with charge pump and an
integrated internal resistor ladder that allows contrast
control in software, and display operation above device
VDD.
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
1.6
Other Special Features
• Integrated Interrupt-On-Change: All digital I/O
ports now feature Interrupt-On-Change (IOC)
functionality for convenient Change Notification
interrupt generation on any I/O pin. IOC can be
individually enabled or disabled on each pin, and
configured for both edge detection polarity and
the use of pull-ups or pull-downs.
• Peripheral Pin Select (PPS): The Peripheral Pin
Select feature allows most digital peripherals to
be mapped over a fixed set of digital I/O pins.
Users may independently map the input and/or
output of any one of the many digital peripherals
to any one of the I/O pins.
• Communications: The PIC24FJ256GA412/GB412
family incorporates multiple serial communication
peripherals to handle a range of application
requirements. All devices have six independent
UARTs with built-in IrDA® encoders/decoders.
There are also three independent I2C modules that
support both Master and Slave modes of operation, and three SPI modules with I2S and variable
data width support.
• Analog Features: All members of the
PIC24FJ256GA412/GB412 family include a 12-bit
A/D Converter module, a triple comparator module
and the CTMU interface. The A/D module incorporates a range of features that allow the converter to
assess and make decisions on incoming data,
reducing CPU overhead for routine
A/D conversions.
The comparator module includes three analog
comparators that are configurable for a wide range
of operations. The CTMU provides a convenient
method for precision time measurement and pulse
generation, and can serve as an interface for
capacitive sensors.
• Enhanced Parallel Master/Parallel Slave Port:
This module allows rapid and transparent access
to the microcontroller data bus, and enables the
CPU to directly address external data memory. The
parallel port can function in Master or Slave mode,
accommodating data widths of 4, 8 or 16 bits, and
address widths of up to 23 bits in Master modes.
• Real-Time Clock and Calendar (RTCC): This
module implements a full-featured clock and
calendar with alarm functions in hardware, freeing
up timer resources and program memory space
for use of the core application.
 2015 Microchip Technology Inc.
1.7
Details on Individual Family
Members
Devices in the PIC24FJ256GA412/GB412 family are
available in 64-pin, 100-pin and 121-pin packages.
General block diagrams for general purpose and USB
devices are shown in Figure 1-1 and Figure 1-2,
respectively.
The devices are differentiated from each other in
five ways:
1.
2.
3.
4.
5.
USB On-The-Go functionality (present only in
PIC24FJXXXGB4XX devices).
Available I/O pins and ports (up to 53 pins on
6 ports for 64-pin devices, up to 85 pins on
7 ports for 100-pin devices and up to 102 pins
on 9 ports for 121-pin devices).
Available remappable pins (29 pins on 64-pin
devices and 44 pins on 100/121-pin devices).
Maximum available drivable LCD pixels (up to
248 for 64-pin devices and 512 on 100/121-pin
devices.)
Analog input channels for the A/D Converter
(16 channels for 64-pin devices and 24 channels
for 100/121-pin devices).
All other features for devices in this family are identical.
These are summarized in Table 1-1, Table 1-2 and
Table 1-3.
A list of pin features available on the PIC24FJ256GA412/
GB412 family devices, sorted by function, is shown in
Table 1-4 (for general purpose devices) or Table 1-5 (for
USB devices). Note that these tables show the pin location of individual peripheral features and not how they are
multiplexed on the same pin. This information is provided
in the pinout diagrams in the beginning of this data sheet.
Multiplexed features are sorted by the priority given to a
feature, with the highest priority peripheral being listed
first.
DS30010089C-page 21
PIC24FJ256GA412/GB412 FAMILY
TABLE 1-1:
DEVICE FEATURES FOR THE PIC24FJ256GA412/GB412 FAMILY: 64-PIN
Features
PIC24FJXXXGA/GB406
64GA
128GA
256GA
Operating Frequency
Program Memory (bytes)
Program Memory (instructions)
Data Memory (bytes)
64GB
128GB
256GB
DC – 32 MHz
64K
128K
256K
64K
128K
256K
22,016
44,032
88,064
22,016
44,032
88,064
8K
16K
8K
Interrupt Sources (soft vectors/
NMI traps)
16K
113 (107/6)
I/O Ports
Ports B, C, D, E, F, G
Total I/O Pins
Remappable Pins
53
52
30 (29 I/Os, 1 input only)
29 (28 I/Os, 1 input only)
Timers:
19(1,2)
Total Number (16-bit)
32-Bit (from paired 16-bit timers)
9
Input Capture w/Timer Channels
6(2)
Output Compare/PWM Channels
6(2)
Capture/Compare/PWM/Timer:
Single Output (SCCP)
4(2)
Multiple Output (MCCP)
3(2)
Serial Communications:
UART
6(2)
SPI (3-wire/4-wire)
4(2)
I2C
3
USB On-The-Go
No
Yes
Cryptographic Engine
Yes
Parallel Communications
(EPMP/PSP)
Yes
10/12-Bit Analog-to-Digital
Converter (A/D) (input channels)
16
Digital-to-Analog Converter
(DAC)
1
Analog Comparators
3
CTMU Interface
LCD Controller (available pixels)
JTAG Boundary Scan
Yes
248 (35 SEG x 8 COM)
240 (34 SEG x 8 COM)
Yes
Resets (and delays)
Core POR, VDD POR, VBAT POR, BOR, RESET Instruction,
MCLR, WDT, Illegal Opcode, REPEAT Instruction,
Hardware Traps, Configuration Word Mismatch
(OST, PLL Lock)
Instruction Set
77 Base Instructions, Multiple Addressing Mode Variations
Packages
Note 1:
2:
64-Pin TQFP and QFN
Includes the Timer modes of the SCCP and MCCP modules.
Some instantiations of these modules are only available through remappable pins.
DS30010089C-page 22
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
TABLE 1-2:
DEVICE FEATURES FOR THE PIC24FJ256GA412/GB412 FAMILY: 100-PIN
Features
PIC24FJXXXGA/GB410
64GA
128GA
256GA
Operating Frequency
Program Memory (bytes)
Program Memory (instructions)
Data Memory (bytes)
64GB
128GB
256GB
DC – 32 MHz
64K
128K
256K
64K
128K
256K
22,016
44,032
88,064
22,016
44,032
88,064
8K
16K
Interrupt Sources (soft vectors/
NMI traps)
8K
16K
113 (107/6)
I/O Ports
Ports A, B, C, D, E, F, G
Total I/O Pins
85
84
Remappable Pins
44 (32 I/Os, 12 input only)
Timers:
19(1,2)
Total Number (16-bit)
32-Bit (from paired 16-bit timers)
9
Input Capture w/Timer Channels
6(2)
Output Compare/PWM Channels
6(2)
Capture/Compare/PWM/Timer:
Single Output (SCCP)
4(2)
Multiple Output (MCCP)
3(2)
Serial Communications:
UART
6(2)
SPI (3-wire/4-wire)
4(2)
I2C
3
USB On-The-Go
No
Yes
Cryptographic Engine
Yes
Parallel Communications
(EPMP/PSP)
Yes
10/12-Bit Analog-to-Digital
Converter (A/D) (input channels)
24
Digital-to-Analog Converter
(DAC)
1
Analog Comparators
3
CTMU Interface
Yes
LCD Controller (available pixels)
512 (64 SEG x 8 COM)
JTAG Boundary Scan
Yes
Resets (and delays)
POR, VBAT POR, BOR, RESET Instruction,
Core POR,
MCLR, WDT, Illegal Opcode, REPEAT Instruction,
Hardware Traps, Configuration Word Mismatch
(OST, PLL Lock)
Instruction Set
77 Base Instructions, Multiple Addressing Mode Variations
Packages
Note 1:
2:
VDD
100-Pin TQFP
Includes the Timer modes of the SCCP and MCCP modules.
Some instantiations of these modules are only available through remappable pins.
 2015 Microchip Technology Inc.
DS30010089C-page 23
PIC24FJ256GA412/GB412 FAMILY
TABLE 1-3:
DEVICE FEATURES FOR THE PIC24FJ256GA412/GB412 FAMILY: 121-PIN
Features
PIC24FJXXXGA/GB412
64GA
128GA
256GA
Operating Frequency
Program Memory (bytes)
Program Memory (instructions)
Data Memory (bytes)
64GB
128GB
256GB
DC – 32 MHz
64K
128K
256K
64K
128K
256K
22,016
44,032
88,064
22,016
44,032
88,064
8K
16K
Interrupt Sources (soft vectors/
NMI traps)
8K
16K
113 (107/6)
I/O Ports
Ports A, B, C, D, E, F, G, H, J
Total I/O Pins
102
Remappable Pins
101
44 (32 I/O, 12 input only)
Timers:
19(1,2)
Total Number (16-bit)
32-Bit (from paired 16-bit timers)
9
Input Capture w/Timer Channels
6(2)
Output Compare/PWM Channels
6(2)
Single Output CCP (SCCP)
4
Multiple Output CCP (MCCP)
3
Serial Communications:
UART
6(2)
SPI (3-wire/4-wire)
4(2)
I2C
3
USB On-The-Go
No
Yes
Cryptographic Engine
Yes
Parallel Communications
(EPMP/PSP)
Yes
10/12-Bit Analog-to-Digital
Converter (A/D) (input channels)
24
Digital-to-Analog Converter
(DAC)
1
Analog Comparators
3
CTMU Interface
LCD Controller (available pixels)
JTAG Boundary Scan
Yes
512 (64 SEG x 8 COM)
Yes
Resets (and delays)
Core POR, VDD POR, VBAT POR, BOR, RESET Instruction,
MCLR, WDT, Illegal Opcode, REPEAT Instruction,
Hardware Traps, Configuration Word Mismatch
(OST, PLL Lock)
Instruction Set
77 Base Instructions, Multiple Addressing Mode Variations
Packages
Note 1:
2:
121-Pin BGA
Includes the Timer modes of SCCP and MCCP modules.
Some instantiations of these modules are only available through remappable pins.
DS30010089C-page 24
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
FIGURE 1-1:
PIC24FJ256GA412 FAMILY GENERAL BLOCK DIAGRAM
Data Bus
Interrupt
Controller
PORTA(1)
16
(12 I/Os)
16
16
8
Data Latch
EDS and
Table Data
Access Control
23
DMA
Controller
Data RAM
PCH
PCL
Program Counter
Repeat
Stack
Control
Control
Logic
Logic
PORTB
(16 I/Os)
Address
Latch
PORTC(1)
16
23
16
16
(8 I/Os)
Read AGU
Write AGU
Address Latch
Program Memory/
Extended Data
Space
PORTD(1)
(16 I/Os)
Data Latch
16
Address Bus
EA MUX
PORTE(1)
24
16
Inst Latch
Inst Register
Instruction
Decode and
Control
Control Signals
OSCO/CLKO
OSCI/CLKI
Power-up
Timer
Timing
Generation
REFI
REFO
Literal
Data
PORTF(1)
(11 I/Os)
DMA
Data Bus
PORTG(1)
Divide
Support
16 x 16
W Reg Array
17x17
Multiplier
(12 I/Os)
PORTH(1)
Oscillator
Start-up Timer
FRC/LPRC
Oscillators
(16 I/Os)
16-Bit ALU
Power-on
Reset
Band Gap
Reference
Watchdog
Timer
Voltage
Regulators
HLVD & BOR
VCAP
(10 I/Os)
16
VBAT
VDD, VSS
16
PORTJ(1)
(2 I/Os)
MCLR
EPMP/PSP
Timer1
IC
1-6(2)
Note 1:
2:
Timers
2/3 & 4/5(2)
OC/PWM
1-6(2)
RTCC
CLC
1-4
UART
1-6(2)
12-Bit
A/D
MCCP
1-3
SCCP
4-7
SPI
1-4(2)
I2C1-3
10-Bit
CTMU
DAC
Comparators(2)
Crypto
Engine
LCD
Driver
Not all I/O pins or features are implemented on all device pinout configurations. See Table 1-4 for specific implementations by pin count.
These peripheral I/Os are only accessible through remappable pins.
 2015 Microchip Technology Inc.
DS30010089C-page 25
PIC24FJ256GA412/GB412 FAMILY
FIGURE 1-2:
PIC24FJ256GB412 FAMILY GENERAL BLOCK DIAGRAM
Data Bus
Interrupt
Controller
PORTA(1)
16
(12 I/Os)
16
16
8
Data Latch
EDS and
Table Data
Access Control
23
DMA
Controller
Data RAM
PCH
PCL
Program Counter
Repeat
Stack
Control
Control
Logic
Logic
PORTB
(16 I/Os)
Address
Latch
PORTC(1)
16
23
16
16
(8 I/Os)
Read AGU
Write AGU
Address Latch
Program Memory/
Extended Data
Space
PORTD(1)
(16 I/Os)
Data Latch
16
Address Bus
EA MUX
PORTE(1)
24
16
Inst Latch
Inst Register
Instruction
Decode and
Control
Control Signals
OSCO/CLKO
OSCI/CLKI
Power-up
Timer
Timing
Generation
REFI
REFO
Timer1
Watchdog
Timer
Voltage
Regulators
HLVD & BOR
Timers
2/3 & 4/5(2)
(10 I/Os)
DMA
Data Bus
PORTG(1)
Divide
Support
16 x 16
W Reg Array
17x17
Multiplier
(12 I/Os)
PORTH(1)
(16 I/Os)
16-Bit ALU
Power-on
Reset
Band Gap
Reference
VBAT
PORTF(1)
Oscillator
Start-up Timer
FRC/LPRC
Oscillators
VCAP
(10 I/Os)
16
Literal
Data
VDD, VSS
RTCC
16
PORTJ(1)
(2 I/Os)
MCLR
CLC
1-4
EPMP/PSP
UART
1-6(2)
12-Bit
A/D
10-Bit
DAC
Comparators(2)
USB
OTG
IC
1-6(2)
Note 1:
2:
OC/PWM
1-6(2)
MCCP
1-3
SCCP
4-7
SPI
1-4(2)
I2C1-3
CTMU
Crypto
Engine
LCD
Driver
Not all I/O pins or features are implemented on all device pinout configurations. See Table 1-5 for specific implementations by pin count.
These peripheral I/Os are only accessible through remappable pins.
DS30010089C-page 26
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
TABLE 1-4:
Pin
Function
PIC24FJ256GA412 FAMILY PINOUT DESCRIPTION
Pin/Pad Number
64-Pin
TQFP
100-Pin
TQFP
121-Pin
BGA
I/O
Input
Buffer
Description
AN0
16
25
K2
I
ANA
AN1
15
24
K1
I
ANA
AN1-
15
24
K1
I
ANA
A/D Channel 1 Negative (VIN-) Input.
A/D Converter (Unipolar) Inputs.
AN2
14
23
J2
I
ANA
AN3
13
22
J1
I
ANA
AN4
12
21
H2
I
ANA
AN5
11
20
H1
I
ANA
AN6
17
26
L1
I
ANA
AN7
18
27
J3
I
ANA
AN8
21
32
K4
I
ANA
AN9
22
33
L4
I
ANA
ANA
A/D Converter (Unipolar) Inputs.
AN10
23
34
H5
I
AN11
24
35
K5
I
ANA
AN12
27
41
J7
I
ANA
AN13
28
42
L7
I
ANA
AN14
29
43
K7
I
ANA
AN15
30
44
L8
I
ANA
AN16
—
9
E1
I
ANA
AN17
—
10
E3
I
ANA
AN18
—
11
F4
I
ANA
AN19
—
12
F2
I
ANA
AN20
—
14
F3
I
ANA
AN21
—
19
G2
I
ANA
AN22
—
92
B5
I
ANA
AN23
—
91
C5
I
ANA
AVDD
19
30
J4
P
—
Power Supply for Analog Modules.
AVSS
20
31
L3
P
—
Ground Reference for Analog Modules.
C1INA
11
20
H1
I
ANA
C1INB
12
21
H2
I
ANA
C1INC
5, 8
11, 14
F3, F4
I
ANA
C1IND
4
10
E3
I
ANA
C2INA
13
22
J1
I
ANA
C2INB
14
23
J2
I
ANA
C2INC
8
14
F3
I
ANA
C2IND
6
12
F2
I
ANA
C3INA
55
84
C7
I
ANA
C3INB
54
83
D7
I
ANA
C3INC
8, 45
14, 71
F3, C11
I
ANA
C3IND
44
70
D11
I
ANA
CLC3OUT
46
72
D9
O
—
CLC Module 3 Output.
CLC4OUT
42
68
E9
O
—
CLC Module 4 Output.
CLKI
39
63
F9
I
ANA
CLKO
40
64
F11
O
—
Legend:
TTL = TTL input buffer
ANA = Analog-level input/output
 2015 Microchip Technology Inc.
Comparator 1 Analog Inputs.
Comparator 2 Analog Inputs.
Comparator 3 Analog Inputs.
Main Clock Input.
System Clock Output.
ST = Schmitt Trigger input buffer
I2C = I2C/SMBus input buffer
DS30010089C-page 27
PIC24FJ256GA412/GB412 FAMILY
TABLE 1-4:
Pin
Function
PIC24FJ256GA412 FAMILY PINOUT DESCRIPTION (CONTINUED)
Pin/Pad Number
64-Pin
TQFP
100-Pin
TQFP
121-Pin
BGA
I/O
Input
Buffer
COM0
63
99
A2
O
—
COM1
62
98
B3
O
—
COM2
61
94
B4
O
—
COM3
60
93
A4
O
—
COM4
59
88
B1
O
—
COM5
23
34
D4
O
—
COM6
22
33
G4
O
—
COM7
21
32
H3
O
—
CTCMP
14
23
J2
I
ANA
CTED1
28
42
L7
I
ST
CTED2
27
41
J7
I
ST
CTED3
—
1
B2
I
ST
CTED4
1
3
D3
I
ST
CTED5
29
43
K7
I
ST
CTED6
30
44
L8
I
ST
CTED7
—
40
K6
I
ST
CTED8
64
100
A1
I
ST
CTED9
63
99
A2
I
ST
CTED10
—
97
A3
I
ST
CTED11
—
95
C4
I
ST
CTED12
15
24
K1
I
ST
CTED13
14
23
J2
I
ST
CTED14
—
17
G3
I
ST
Description
LCD Driver Common Outputs.
CTMU Comparator Input (Pulse mode).
CTMU External Edge Inputs.
CTPLS
29
43
K7
O
—
CTMU Pulse Output.
CVREF
23
34
H5
O
—
Comparator Voltage Reference Output.
CVREF+
16
25, 29
K2, K3
I
ANA
Comparator Voltage Reference Input (High).
CVREF-
15
24, 28
K1, L2
I
ANA
Comparator Voltage Reference Input (Low).
DAC1
8
14
F3
O
—
DVREF+
16
25, 29
K2, K3
I
ANA
DAC1 Analog Output.
FSYNC4
24
35
K5
I/O
ST
SPI4 Frame Sync Signal.
IC4
1
3
D3
I
ST
Input Capture 4 Input.
IC5
2
4
C1
I
ST
Input Capture 5 Input.
IC6
3
5
D2
I
ST
Input Capture 6 Input.
ICM1
4
10
E3
I
ST
Input Capture 1 Input (MCCP1).
ICM2
6
12
F2
I
ST
Input Capture 2 Input (MCCP2).
DAC Positive Reference Input.
ICM3
11
20
H1
I
ST
Input Capture 3 Input (MCCP3).
ICM4
49
76
A11
I
ST
Input Capture 4 Input (SCCP4).
ICM5
42
68
E9
I
ST
Input Capture 5 Input (SCCP5).
ICM6
46
72
D9
I
ST
Input Capture 6 Input (SCCP6).
ICM7
51
78
B9
I
ST
Input Capture 7 Input (SCCP7).
INT0
46
72
D9
I
ST
External Interrupt 0 Input.
Legend:
TTL = TTL input buffer
ANA = Analog-level input/output
DS30010089C-page 28
ST = Schmitt Trigger input buffer
I2C = I2C/SMBus input buffer
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
TABLE 1-4:
Pin
Function
PIC24FJ256GA412 FAMILY PINOUT DESCRIPTION (CONTINUED)
Pin/Pad Number
64-Pin
TQFP
100-Pin
TQFP
121-Pin
BGA
I/O
Input
Buffer
LCDBIAS0
3
5
D2
I
ANA
LCDBIAS1
2
4
C1
I
ANA
LCDBIAS2
1
3
D3
I
ANA
Description
Bias Inputs for LCD Driver Charge Pump.
LCDBIAS3
17
26
L1
I
ANA
LVDIN
64
100
A1
I
ANA
MCLR
7
13
F1
I
ST
Master Clear (Device Reset) Input.
This line is brought low to cause a Reset.
OC4
54
83
D7
O
—
Output Compare/PWM4 Output (SCCP4).
OC5
55
84
C7
O
—
Output Compare/PWM5 Output (SCCP5).
OC6
58
87
B6
O
—
Output Compare/PWM6 Output (SCCP6).
OCM1A
4
10
E3
O
—
Output Compare/PWM1 Outputs (MCCP1).
OCM1B
5
11
F4
O
—
OCM1C
—
1
B2
O
—
OCM1D
—
6
D1
O
—
OCM1E
—
91
C5
O
—
OCM1F
—
92
B5
O
—
OCM2A
6
12
F2
O
—
OCM2B
8
14
F3
O
—
OCM2C
—
7
E4
O
—
OCM2D
—
8
E2
O
—
OCM2E
—
96
C3
O
—
OCM2F
—
97
A3
O
—
OCM3A
11
20
H1
O
—
OCM3B
12
21
H2
O
—
OCM3C
—
9
E1
O
—
OCM3D
—
17
G3
O
—
OCM3E
—
79
A9
O
—
High/Low-Voltage Detect Input.
Output Compare/PWM2 Outputs (MCCP2).
Output Compare/PWM3 Outputs (MCCP3).
OCM3F
—
80
D8
O
—
OSCI
39
63
F9
I
ANA
OSCO
40
64
F11
O
—
Primary Oscillator Output.
PGEC1
15
24
K1
I/O
ST
PGEC2
17
26
L1
I/O
ST
In-Circuit Debugger/Emulator/ICSP™
Programming Clock.
PGEC3
11
20
H1
I/O
ST
PGED1
16
25
K2
I/O
ST
PGED2
18
27
J3
I/O
ST
12
21
H2
I/O
PGED3
Legend:
TTL = TTL input buffer
ANA = Analog-level input/output
 2015 Microchip Technology Inc.
Primary Oscillator Input.
In-Circuit Debugger/Emulator/ICSP Programming
Data.
ST
ST = Schmitt Trigger input buffer
I2C = I2C/SMBus input buffer
DS30010089C-page 29
PIC24FJ256GA412/GB412 FAMILY
TABLE 1-4:
Pin
Function
PIC24FJ256GA412 FAMILY PINOUT DESCRIPTION (CONTINUED)
Pin/Pad Number
64-Pin
TQFP
100-Pin
TQFP
121-Pin
BGA
I/O
Input
Buffer
PMA0
30
44
L8
I/O
ST
Parallel Master Port Address Bit 0 Input (Buffered
Slave modes) and Output (Master modes).
PMA1
29
43
K7
I/O
ST
Parallel Master Port Address Bit 1 Input (Buffered
Slave modes) and Output (Master modes).
PMA2
8
14
F3
O
—
Parallel Master Port Address (bits<10:2>).
PMA3
6
12
F2
O
—
PMA4
5
11
F4
O
—
PMA5
4
10
E3
O
—
PMA6
16
29
K3
O
—
PMA7
22
28
L2
O
—
PMA8
32
50
L11
O
—
PMA9
31
49
L10
O
—
PMA10
28
42
L7
O
—
PMA11
27
41
J7
O
—
PMA12
24
35
K5
O
—
PMA13
23
34
H5
O
—
PMA14
45
71
C11
O
—
PMA15
44
70
D11
O
—
PMA16
—
95
C4
O
—
PMA17
—
92
B5
O
—
PMA18
—
40
K6
O
—
—
Description
Parallel Master Port Address (bits<22:11>).
PMA19
—
19
G2
O
PMA20
—
59
G10
O
—
PMA21
—
60
G11
O
—
PMA22
—
66
E11
O
—
PMACK1
50
77
A10
I
ST/TTL
Parallel Master Port Acknowledge Input 1.
PMACK2
43
69
E10
I
ST/TTL
Parallel Master Port Acknowledge Input 2.
PMBE0
51
78
B9
O
—
Parallel Master Port Byte Enable 0 Strobe.
PMBE1
—
67
E8
O
—
Parallel Master Port Byte Enable 1 Strobe.
PMCS1
—
18
G1
I/O
ST/TTL
Parallel Master Port Chip Select 1 Strobe.
PMCS2
—
9
E1
O
—
Parallel Master Port Chip Select 2 Strobe.
Legend:
TTL = TTL input buffer
ANA = Analog-level input/output
DS30010089C-page 30
ST = Schmitt Trigger input buffer
I2C = I2C/SMBus input buffer
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
TABLE 1-4:
Pin
Function
PIC24FJ256GA412 FAMILY PINOUT DESCRIPTION (CONTINUED)
Pin/Pad Number
64-Pin
TQFP
100-Pin
TQFP
121-Pin
BGA
I/O
Input
Buffer
PMD0
60
93
A4
I/O
ST/TTL
PMD1
61
94
B4
I/O
ST/TTL
PMD2
62
98
B3
I/O
ST/TTL
PMD3
63
99
A2
I/O
ST/TTL
PMD4
64
100
A1
I/O
ST/TTL
PMD5
1
3
D3
I/O
ST/TTL
PMD6
2
4
C1
I/O
ST/TTL
Description
Parallel Master Port Data (Demultiplexed
Master mode) or Address/Data (Multiplexed
Master modes).
PMD7
3
5
D2
I/O
ST/TTL
PMD8
—
90
A5
I/O
ST/TTL
PMD9
—
89
E6
I/O
ST/TTL
PMD10
—
88
A6
I/O
ST/TTL
PMD11
—
87
B6
I/O
ST/TTL
PMD12
—
79
A9
I/O
ST/TTL
PMD13
—
80
D8
I/O
ST/TTL
PMD14
—
83
D7
I/O
ST/TTL
PMD15
—
84
C7
I/O
ST/TTL
PMRD
53
82
B8
O
—
Parallel Master Port Read Strobe.
PMWR
52
81
C8
O
—
Parallel Master Port Write Strobe.
PWRGT
21
32
K4
O
—
RTCC Power Control Output.
PWRLCLK
48
74
B11
I
ST
RTCC External Clock Source Input.
RA0
—
17
G3
I/O
ST
PORTA Digital I/Os.
RA1
—
38
J6
I/O
ST
RA2
—
58
H11
I/O
ST
RA3
—
59
G10
I/O
ST
RA4
—
60
G11
I/O
ST
RA5
—
61
G9
I/O
ST
RA6
—
91
C5
I/O
ST
RA7
—
92
B5
I/O
ST
RA9
—
28
L2
I/O
ST
RA10
—
29
K3
I/O
ST
RA14
—
66
E11
I/O
ST
—
67
E8
I/O
RA15
Legend:
TTL = TTL input buffer
ANA = Analog-level input/output
 2015 Microchip Technology Inc.
ST
ST = Schmitt Trigger input buffer
I2C = I2C/SMBus input buffer
DS30010089C-page 31
PIC24FJ256GA412/GB412 FAMILY
TABLE 1-4:
Pin
Function
PIC24FJ256GA412 FAMILY PINOUT DESCRIPTION (CONTINUED)
Pin/Pad Number
64-Pin
TQFP
100-Pin
TQFP
121-Pin
BGA
I/O
Input
Buffer
RB0
16
25
K2
I/O
ST
RB1
15
24
K1
I/O
ST
RB2
14
23
J2
I/O
ST
RB3
13
22
J1
I/O
ST
RB4
12
21
H2
I/O
ST
RB5
11
20
H1
I/O
ST
RB6
17
26
L1
I/O
ST
RB7
18
27
J3
I/O
ST
RB8
21
32
K4
I/O
ST
RB9
22
33
L4
I/O
ST
RB10
23
34
H5
I/O
ST
RB11
24
35
K5
I/O
ST
RB12
27
41
J7
I/O
ST
RB13
28
42
L7
I/O
ST
RB14
29
43
K7
I/O
ST
RB15
30
44
L8
I/O
ST
RC1
—
6
D1
I/O
ST
RC2
—
7
E4
I/O
ST
RC3
—
8
E2
I/O
ST
RC4
—
9
E1
I/O
ST
RC12
39
63
F9
I/O
ST
RC13
47
73
C10
I/O
ST
RC14
48
74
B11
I/O
ST
RC15
40
64
F11
I/O
ST
RD0
46
72
D9
I/O
ST
RD1
49
76
A11
I/O
ST
RD2
50
77
A10
I/O
ST
RD3
51
78
B9
I/O
ST
RD4
52
81
C8
I/O
ST
RD5
53
82
B8
I/O
ST
RD6
54
83
D7
I/O
ST
RD7
55
84
C7
I/O
ST
RD8
42
68
E9
I/O
ST
RD9
43
69
E10
I/O
ST
RD10
44
70
D11
I/O
ST
RD11
45
71
C11
I/O
ST
RD12
—
79
A9
I/O
ST
RD13
—
80
D8
I/O
ST
RD14
—
47
L9
I/O
ST
—
48
K9
I/O
RD15
Legend:
TTL = TTL input buffer
ANA = Analog-level input/output
DS30010089C-page 32
Description
PORTB Digital I/Os.
PORTC Digital I/Os.
PORTD Digital I/Os.
ST
ST = Schmitt Trigger input buffer
I2C = I2C/SMBus input buffer
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
TABLE 1-4:
Pin
Function
PIC24FJ256GA412 FAMILY PINOUT DESCRIPTION (CONTINUED)
Pin/Pad Number
64-Pin
TQFP
100-Pin
TQFP
121-Pin
BGA
I/O
Input
Buffer
RE0
60
93
A4
I/O
ST
RE1
61
94
B4
I/O
ST
RE2
62
98
B3
I/O
ST
RE3
63
99
A2
I/O
ST
RE4
64
100
A1
I/O
ST
RE5
1
3
D3
I/O
ST
RE6
2
4
C1
I/O
ST
Description
PORTE Digital I/Os.
RE7
3
5
D2
I/O
ST
RE8
—
18
G1
I/O
ST
RE9
—
19
G2
I/O
ST
REFI1
24
35
K5
I
ST
External Reference Clock Input.
PORTF Digital I/Os.
RF0
58
87
B6
I/O
ST
RF1
59
88
A6
I/O
ST
RF2
34
52
K11
I/O
ST
RF3
33
51
K10
I/O
ST
RF4
31
49
L10
I/O
ST
RF5
32
50
L11
I/O
ST
RF6
35
55
H9
I/O
ST
RF7
—
54
H8
I/O
ST
RF8
—
53
J10
I/O
ST
RF12
—
40
K6
I/O
ST
RF13
—
39
L6
I/O
ST
RG0
—
90
A5
I/O
ST
RG1
—
89
E6
I/O
ST
RG2
37
57
H10
I/O
ST
RG3
36
56
J11
I/O
ST
RG6
4
10
E3
I/O
ST
RG7
5
11
F4
I/O
ST
RG8
6
12
F2
I/O
ST
RG9
8
14
F3
I/O
ST
RG12
—
96
C3
I/O
ST
RG13
—
97
A3
I/O
ST
RG14
—
95
C4
I/O
ST
—
1
B2
I/O
RG15
Legend:
TTL = TTL input buffer
ANA = Analog-level input/output
 2015 Microchip Technology Inc.
PORTG Digital I/Os.
ST
ST = Schmitt Trigger input buffer
I2C = I2C/SMBus input buffer
DS30010089C-page 33
PIC24FJ256GA412/GB412 FAMILY
TABLE 1-4:
Pin
Function
PIC24FJ256GA412 FAMILY PINOUT DESCRIPTION (CONTINUED)
Pin/Pad Number
64-Pin
TQFP
100-Pin
TQFP
121-Pin
BGA
I/O
Input
Buffer
RH1
—
—
B1
I/O
ST
RH2
—
—
D4
I/O
ST
RH3
—
—
G4
I/O
ST
RH4
—
—
H3
I/O
ST
RH5
—
—
H4
I/O
ST
RH6
—
—
L5
I/O
ST
RH7
—
—
J5
I/O
ST
RH8
—
—
H7
I/O
ST
RH9
—
—
J8
I/O
ST
RH10
—
—
J9
I/O
ST
RH11
—
—
G8
I/O
ST
RH12
—
—
F7
I/O
ST
RH13
—
—
C9
I/O
ST
RH14
—
—
A8
I/O
ST
RH15
—
—
F6
I/O
ST
RJ0
—
—
D5
I/O
ST
RJ1
—
—
E5
I/O
ST
RP0
16
25
K2
I/O
ST
RP1
15
24
K1
I/O
ST
RP2
42
68
E9
I/O
ST
RP3
44
70
D11
I/O
ST
RP4
43
69
E10
I/O
ST
RP5
—
48
K9
I/O
ST
RP6
17
26
L1
I/O
ST
RP7
18
27
J3
I/O
ST
RP8
21
32
K4
I/O
ST
RP9
22
33
L4
I/O
ST
RP10
31
49
L10
I/O
ST
RP11
46
72
D9
I
ST
RP12
45
71
C11
I
ST
RP13
14
23
J2
I
ST
RP14
29
43
K7
I
ST
RP15
—
53
J10
I
ST
RP16
33
51
K10
I
ST
RP17
32
50
L11
I
ST
RP18
11
20
H1
I
ST
RP19
6
12
F2
I
ST
RP20
53
82
B8
I
ST
RP21
4
10
E3
I
ST
RP22
51
78
B9
I
ST
RP23
50
77
A10
I
ST
RP24
49
76
A11
I
ST
RP25
52
81
C8
I
ST
Legend:
TTL = TTL input buffer
ANA = Analog-level input/output
DS30010089C-page 34
Description
PORTH Digital I/Os.
PORTJ Digital I/Os.
Remappable Peripherals (Input or Output).
ST = Schmitt Trigger input buffer
I2C = I2C/SMBus input buffer
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
TABLE 1-4:
Pin
Function
PIC24FJ256GA412 FAMILY PINOUT DESCRIPTION (CONTINUED)
Pin/Pad Number
64-Pin
TQFP
100-Pin
TQFP
121-Pin
BGA
I/O
Input
Buffer
RP26
5
11
F4
I
ST
RP27
8
14
F3
I
ST
RP28
12
21
H2
I
ST
RP29
30
44
L8
I
ST
RP30
34
52
K11
I
ST
RP31
—
39
L6
I
ST
RPIN32
—
40
K6
I
ST
RPIN33
—
18
G1
I
ST
RPIN34
—
19
G2
I
ST
RPIN35
—
67
E8
I
ST
RPIN36
—
66
E11
I
ST
RPIN37
48
74
B11
I
ST
RPIN38
—
6
D1
I
ST
RPIN39
—
7
E4
I
ST
RPIN40
—
8
E2
I
ST
RPIN41
—
9
E1
I
ST
RPIN42
—
79
A9
I
ST
Description
Remappable Peripherals (Input or Output).
Remappable Peripherals (Input Only).
RPIN43
—
47
L9
I
ST
RTCC
42
68
E9
O
—
SCK4
59
88
A6
I/O
ST
SPI4 Serial Clock Input/Output.
SCL1
37
57
H10
I/O
I2C
I2C1 Synchronous Serial Clock Input/Output.
SCL2
32
58
H11
I/O
I2C
I2C2 Synchronous Serial Clock Input/Output.
SCL3
2
4
C1
I/O
I2C
I2C3 Synchronous Serial Clock Input/Output.
Real-Time Clock Output.
SCLKI
48
74
B11
I
ST
Secondary Oscillator Digital Clock Input.
SDA1
36
56
J11
I/O
I2C
I2C1 Data Input/Output.
SDA2
31
59
G10
I/O
I2C
I2C2 Data Input/Output.
SDA3
3
5
D2
I/O
I2C
I2C3 Data Input/Output.
SDI4
28
42
L7
I
ST
SPI4 Data Input.
SDO4
23
34
H5
O
—
SPI4 Data Output.
Legend:
TTL = TTL input buffer
ANA = Analog-level input/output
 2015 Microchip Technology Inc.
ST = Schmitt Trigger input buffer
I2C = I2C/SMBus input buffer
DS30010089C-page 35
PIC24FJ256GA412/GB412 FAMILY
TABLE 1-4:
Pin
Function
PIC24FJ256GA412 FAMILY PINOUT DESCRIPTION (CONTINUED)
Pin/Pad Number
64-Pin
TQFP
100-Pin
TQFP
121-Pin
BGA
I/O
Input
Buffer
SEG0
4
10
E3
O
—
SEG1
8
14
F3
O
—
SEG2
11
20
H1
O
—
SEG3
12
21
H2
O
—
SEG4
13
22
J1
O
—
SEG5
14
23
J2
O
—
SEG6
15
24
K1
O
—
SEG7
16
25
K2
O
—
SEG8
29
43
K7
O
—
SEG9
30
44
L8
O
—
SEG10
31
49
L10
O
—
SEG11
32
50
L11
O
—
SEG12
33
51
K10
O
—
SEG13
42
68
E9
O
—
SEG14
43
69
E10
O
—
SEG15
44
70
D11
O
—
SEG16
45
71
C11
O
—
SEG17
46
72
D9
O
—
SEG18
27
41
J7
O
—
SEG19
28
42
L7
O
—
SEG20
49
76
A11
O
—
SEG21
50
77
A10
O
—
SEG22
51
78
B9
O
—
SEG23
52
81
C8
O
—
SEG24
53
82
B8
O
—
SEG25
54
83
D7
O
—
SEG26
55
84
C7
O
—
SEG27
58
87
B6
O
—
SEG28
—
61
G9
O
—
SEG29
23
34
H5
O
—
SEG30
22
33
L4
O
—
SEG31
21
32
K4
O
—
SEG32
—
6
D1
O
—
SEG33
—
8
E2
O
—
SEG34
—
18
G1
O
—
SEG35
—
19
G2
O
—
SEG36
—
28
L2
O
—
SEG37
—
29
K3
O
—
SEG38
—
47
L9
O
—
SEG39
—
48
K9
O
—
SEG40
34
52
K11
O
—
Legend:
TTL = TTL input buffer
ANA = Analog-level input/output
DS30010089C-page 36
Description
LCD Driver Segment Outputs.
ST = Schmitt Trigger input buffer
I2C = I2C/SMBus input buffer
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
TABLE 1-4:
Pin
Function
PIC24FJ256GA412 FAMILY PINOUT DESCRIPTION (CONTINUED)
Pin/Pad Number
64-Pin
TQFP
100-Pin
TQFP
121-Pin
BGA
I/O
Input
Buffer
SEG41
—
53
J10
O
—
SEG42
—
66
E11
O
—
SEG43
—
67
E8
O
—
SEG44
—
79
A9
O
—
SEG45
—
80
D8
O
—
SEG46
—
89
E6
O
—
SEG47
59
88
A6
O
—
SEG48
—
17
G3
O
—
SEG49
—
90
A5
O
—
SEG50
—
1
B2
O
—
SEG51
—
7
E4
O
—
SEG52
—
9
E1
O
—
SEG53
—
39
L6
O
—
SEG54
—
40
K6
O
—
SEG55
—
58
H11
O
—
SEG56
—
59
G10
O
—
SEG57
—
91
C5
O
—
SEG58
—
92
B5
O
—
SEG59
—
95
C4
O
—
—
SEG60
—
96
C3
O
SEG61
—
97
A3
O
—
SEG62
64
100
A1
O
—
SEG63
18
27
J3
O
—
Description
LCD Driver Segment Outputs.
SOSCI
47
73
C10
I
ANA
SOSCO
48
74
B11
O
—
Secondary Oscillator Input.
Secondary Oscillator Output.
SS4
24
35
K5
O
—
SPI4 Slave Select Signal.
T1CK
22
33
L4
I
ST
External Timer1 Clock Input.
TCK
27
38
J6
I
ST
JTAG Test Clock/Programming Clock Input.
TDI
28
60
G11
I
ST
JTAG Test Data/Programming Data Input.
TDO
24
61
G9
O
—
JTAG Test Data Output.
TMPR
22
33
L4
I
ST
Anti-Tamper Pin.
TMS
23
17
G3
I
ST
JTAG Test Mode Select Input.
U5BCLK
55
84
C7
O
—
UART5 Baud Clock Output (IrDA® mode).
U5CTS
58
87
B6
I
ST
UART5 Clear-to-Send Input.
U5RTS
55
84
C7
O
—
UART5 Request-to-Send Output.
UART5 Receiver Input.
U5RX
54
83
D7
I
ST
U5TX
49
76
A11
O
—
UART5 Transmitter Output.
U6BCLK
42
68
E9
O
—
UART6 Baud Clock Output (IrDA mode).
U6CTS
46
72
D9
I
ST
UART6 Clear-to-Send Input.
U6RTS
42
68
E9
O
—
UART6 Request-to-Send Output.
U6RX
27
41
J7
I
ST
UART6 Receiver Input.
18
27
J3
O
—
UART6 Transmitter Output.
U6TX
Legend:
TTL = TTL input buffer
ANA = Analog-level input/output
 2015 Microchip Technology Inc.
ST = Schmitt Trigger input buffer
I2C = I2C/SMBus input buffer
DS30010089C-page 37
PIC24FJ256GA412/GB412 FAMILY
TABLE 1-4:
Pin
Function
PIC24FJ256GA412 FAMILY PINOUT DESCRIPTION (CONTINUED)
Pin/Pad Number
64-Pin
TQFP
100-Pin
TQFP
121-Pin
BGA
I/O
Input
Buffer
Description
VBAT
57
86
A7
P
—
Backup Battery (B+) Input.
VCAP
56
85
B7
P
—
External Filter Capacitor Pin.
VDD
10, 26, 38
2, 16, 37,
46, 62
C2, D6, E7,
F8, G5, H6,
K8
P
—
Positive Supply for Digital Logic and I/O Pins.
VLCAP1
5
11
F4
P
ANA
VLCAP2
6
12
F2
P
ANA
VREF+
16
25, 29
K2, K3
I
ANA
Analog Voltage Reference Input (High).
VREF-
15
24, 28
K1, L2
I
ANA
Analog Voltage Reference Input (Low).
9, 25, 41
15, 36, 45,
65, 75
B10, C6,
D10, F5,
F10, G6, G7
P
—
Vss
Legend:
TTL = TTL input buffer
ANA = Analog-level input/output
DS30010089C-page 38
LCD Driver Charge Pump Capacitor Pins.
Ground Reference for Digital Logic and I/O Pins.
ST = Schmitt Trigger input buffer
I2C = I2C/SMBus input buffer
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
TABLE 1-5:
Pin
Function
PIC24FJ256GB412 FAMILY PINOUT DESCRIPTION
Pin/Pad Number
64-Pin
TQFP
100-Pin
TQFP
121-Pin
BGA
I/O
Input
Buffer
Description
AN0
16
25
K2
I
ANA
AN1
15
24
K1
I
ANA
A/D Converter (Unipolar) Inputs.
AN1-
15
24
K1
I
ANA
A/D Channel 1 Negative Input.
A/D Converter (Unipolar) Inputs.
AN2
14
23
J2
I
ANA
AN3
13
22
J1
I
ANA
AN4
12
21
H2
I
ANA
AN5
11
20
H1
I
ANA
AN6
17
26
L1
I
ANA
AN7
18
27
J3
I
ANA
AN8
21
32
K4
I
ANA
AN9
22
33
L4
I
ANA
AN10
23
34
H5
I
ANA
AN11
24
35
K5
I
ANA
AN12
27
41
J7
I
ANA
AN13
28
42
L7
I
ANA
AN14
29
43
K7
I
ANA
AN15
30
44
L8
I
ANA
AN16
—
9
E1
I
ANA
AN17
—
10
E3
I
ANA
AN18
—
11
F4
I
ANA
AN19
—
12
F2
I
ANA
AN20
—
14
F3
I
ANA
AN21
—
19
G2
I
ANA
AN22
—
92
B5
I
ANA
AN23
—
91
C5
I
ANA
AVDD
19
30
J4
P
—
Power Supply for Analog Modules.
AVSS
20
31
L3
P
—
Ground Reference for Analog Modules.
C1INA
11
20
H1
I
ANA
C1INB
12
21
H2
I
ANA
C1INC
5, 8
11, 14
F3, F4
I
ANA
C1IND
4
10
E3
I
ANA
C2INA
13
22
J1
I
ANA
C2INB
14
23
J2
I
ANA
C2INC
8
14
F3
I
ANA
C2IND
6
12
F2
I
ANA
C3INA
55
84
C7
I
ANA
C3INB
54
83
D7
I
ANA
C3INC
8, 45
14, 71
F3, C11
I
ANA
C3IND
44
70
D11
I
ANA
CLC3OUT
46
72
D9
O
—
CLC4OUT
42
68
E9
O
—
CLKI
39
63
F9
I
ANA
CLKO
40
64
F11
O
—
Legend:
TTL = TTL input buffer
ANA = Analog-level input/output
 2015 Microchip Technology Inc.
Comparator 1 Analog Inputs.
Comparator 2 Analog Inputs.
Comparator 3 Analog Inputs.
CLC Module 3 Output.
CLC Module 4 Output.
Main Clock Input.
System Clock Output.
ST = Schmitt Trigger input buffer
I2C = I2C/SMBus input buffer
DS30010089C-page 39
PIC24FJ256GA412/GB412 FAMILY
TABLE 1-5:
Pin
Function
PIC24FJ256GB412 FAMILY PINOUT DESCRIPTION (CONTINUED)
Pin/Pad Number
64-Pin
TQFP
100-Pin
TQFP
121-Pin
BGA
I/O
Input
Buffer
COM0
63
99
A2
O
—
COM1
62
98
B3
O
—
COM2
61
94
B4
O
—
COM3
60
93
A4
O
—
COM4
59
88
B1
O
—
COM5
23
34
D4
O
—
COM6
22
33
G4
O
—
—
Description
LCD Driver Common Outputs.
COM7
21
32
H3
O
CTCMP
14
23
J2
I
—
CTMU Comparator Input (Pulse mode).
CTED1
28
42
L7
I
ST
CTMU External Edge Inputs.
CTED2
27
41
J7
I
ST
CTED3
—
1
B2
I
ST
CTED4
1
3
D3
I
ST
CTED5
29
43
K7
I
ST
CTED6
30
44
L8
I
ST
ST
CTED7
—
40
K6
I
CTED8
64
100
A1
I
ST
CTED9
63
99
A2
I
ST
CTED10
—
97
A3
I
ST
CTED11
—
95
C4
I
ST
CTED12
15
24
K1
I
ST
CTED13
14
23
J2
I
ST
CTED14
—
17
G3
I
ST
CTPLS
29
43
K7
O
—
CTMU Pulse Output.
CVREF
23
34
H5
O
—
Comparator Voltage Reference Output.
CVREF+
16
25, 29
K2, K3
I
ANA
Comparator Voltage Reference Input (High).
CVREF-
15
24, 28
K1, L2
I
ANA
Comparator Voltage Reference Input (Low).
D+
37
57
H10
I/O
—
USB Transceiver Differential Plus Line.
D-
36
56
J11
I/O
—
USB Transceiver Differential Minus Line.
DAC1
8
14
F3
O
—
DVREF+
16
25, 29
K2, K3
I
ANA
FSYNC4
24
35
K5
I/O
ST
SPI4 Frame Sync Signal.
IC4
1
3
D3
I
ST
Input Capture 4 Input.
IC5
2
4
C1
I
ST
Input Capture 5 Input.
IC6
3
5
D2
I
ST
Input Capture 6 Input.
ICM1
4
10
E3
I
ST
Input Capture 1 Input (MCCP1).
ICM2
6
12
F2
I
ST
Input Capture 2 Input (MCCP2).
ICM3
11
20
H1
I
ST
Input Capture 3 Input (MCCP3).
ICM4
49
76
A11
I
ST
Input Capture 4 Input (SCCP4).
ICM5
42
68
E9
I
ST
Input Capture 5 Input (SCCP5).
ICM6
46
72
D9
I
ST
Input Capture 6 Input (SCCP6).
ICM7
51
78
B9
I
ST
Input Capture 7 Input (SCCP7).
INT0
46
72
D9
I
ST
External Interrupt Input 0.
Legend:
TTL = TTL input buffer
ANA = Analog-level input/output
DS30010089C-page 40
DAC1 Analog Output.
DAC Positive Reference Input.
ST = Schmitt Trigger input buffer
I2C = I2C/SMBus input buffer
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
TABLE 1-5:
Pin
Function
PIC24FJ256GB412 FAMILY PINOUT DESCRIPTION (CONTINUED)
Pin/Pad Number
64-Pin
TQFP
100-Pin
TQFP
121-Pin
BGA
I/O
Input
Buffer
LCDBIAS0
3
5
D2
I
ANA
LCDBIAS1
2
4
C1
I
ANA
LCDBIAS2
1
3
D3
I
ANA
Description
Bias Inputs for LCD Driver.
LCDBIAS3
17
26
L1
I
ANA
LVDIN
64
100
A1
I
ANA
MCLR
7
13
F1
I
ST
Master Clear (Device Reset) Input.
This line is brought low to cause a Reset.
OC4
54
83
D7
O
—
Output Compare/PWM4 Output (SCCP4).
OC5
55
84
C7
O
—
Output Compare/PWM5 Output (SCCP5).
OC6
58
87
B6
O
—
Output Compare/PWM6 Output (SCCP6).
OCM1A
4
10
E3
O
—
Output Compare/PWM1 Outputs (MCCP1).
OCM1B
5
11
F4
O
—
OCM1C
—
1
B2
O
—
OCM1D
—
6
D1
O
—
OCM1E
—
91
C5
O
—
OCM1F
—
92
B5
O
—
OCM2A
6
12
F2
O
—
OCM2B
8
14
F3
O
—
OCM2C
—
7
E4
O
—
OCM2D
—
8
E2
O
—
OCM2E
—
96
C3
O
—
High/Low-Voltage Detect Input.
Output Compare/PWM2 Outputs (MCCP2).
OCM2F
—
97
A3
O
—
OCM3A
11
20
H1
O
—
OCM3B
12
21
H2
O
—
OCM3C
—
9
E1
O
—
OCM3D
—
17
G3
O
—
OCM3E
—
79
A9
O
—
OCM3F
—
80
D8
O
—
OSCI
39
63
F9
I
ANA
OSCO
40
64
F11
O
—
Primary Oscillator Output.
PGEC1
15
24
K1
I/O
ST
PGEC2
17
26
L1
I/O
ST
In-Circuit Debugger/Emulator/ICSP™
Programming Clock.
PGEC3
11
20
H1
I/O
ST
Output Compare/PWM3 Outputs (MCCP3).
Primary Oscillator Input.
PGED1
16
25
K2
I/O
ST
PGED2
18
27
J3
I/O
ST
PGED3
12
21
H2
I/O
ST
PMA0
30
44
L8
I/O
ST
Parallel Master Port Address Bit 0 Input (Buffered
Slave modes) and Output (Master modes).
PMA1
29
43
K7
I/O
ST
Parallel Master Port Address Bit 1 Input (Buffered
Slave modes) and Output (Master modes).
Parallel Master Port Address (bits<5:2>).
PMA2
8
14
F3
O
—
PMA3
6
12
F2
O
—
PMA4
5
11
F4
O
—
4
10
E3
O
PMA5
Legend:
TTL = TTL input buffer
ANA = Analog-level input/output
 2015 Microchip Technology Inc.
In-Circuit Debugger/Emulator/ICSP Programming
Data.
—
ST = Schmitt Trigger input buffer
I2C = I2C/SMBus input buffer
DS30010089C-page 41
PIC24FJ256GA412/GB412 FAMILY
TABLE 1-5:
Pin
Function
PIC24FJ256GB412 FAMILY PINOUT DESCRIPTION (CONTINUED)
Pin/Pad Number
64-Pin
TQFP
100-Pin
TQFP
121-Pin
BGA
I/O
Input
Buffer
PMA6
16
29
K3
O
—
PMA7
22
28
L2
O
—
PMA8
32
50
L11
O
—
PMA9
31
49
L10
O
—
PMA10
28
42
L7
O
—
Description
Parallel Master Port Address (bits<22:6>).
PMA11
27
41
J7
O
—
PMA12
24
35
K5
O
—
PMA13
23
34
H5
O
—
PMA14
45
71
C11
O
—
PMA15
44
70
D11
O
—
PMA16
—
95
C4
O
—
PMA17
—
92
B5
O
—
PMA18
—
40
K6
O
—
PMA19
—
19
G2
O
—
PMA20
—
59
G10
O
—
PMA21
—
60
G11
O
—
PMA22
—
66
E11
O
—
PMACK1
50
77
A10
I
ST/TTL
Parallel Master Port Acknowledge Input 1.
PMACK2
43
69
E10
I
ST/TTL
Parallel Master Port Acknowledge Input 2.
PMBE0
51
78
B9
O
—
Parallel Master Port Byte Enable 0 Strobe.
PMBE1
—
67
E8
O
—
Parallel Master Port Byte Enable 1 Strobe.
PMCS1
—
18
G1
I/O
ST/TTL
Parallel Master Port Chip Select 1 Strobe.
PMCS2
—
9
E1
O
—
Parallel Master Port Chip Select 1 Strobe.
PMD0
60
93
A4
I/O
ST/TTL
PMD1
61
94
B4
I/O
ST/TTL
PMD2
62
98
B3
I/O
ST/TTL
PMD3
63
99
A2
I/O
ST/TTL
PMD4
64
100
A1
I/O
ST/TTL
PMD5
1
3
D3
I/O
ST/TTL
PMD6
2
4
C1
I/O
ST/TTL
PMD7
3
5
D2
I/O
ST/TTL
PMD8
—
90
A5
I/O
ST/TTL
PMD9
—
89
E6
I/O
ST/TTL
PMD10
—
88
A6
I/O
ST/TTL
PMD11
—
87
B6
I/O
ST/TTL
PMD12
—
79
A9
I/O
ST/TTL
PMD13
—
80
D8
I/O
ST/TTL
PMD14
—
83
D7
I/O
ST/TTL
PMD15
—
84
C7
I/O
ST/TTL
PMRD
53
82
B8
I/O
ST/TTL
PMWR
52
81
C8
I/O
ST/TTL
PWRGT
21
32
K4
O
—
RTCC Power Control Output.
PWRLCLK
48
74
B11
I
ST
RTCC External Clock Source Input.
Legend:
TTL = TTL input buffer
ANA = Analog-level input/output
DS30010089C-page 42
Parallel Master Port Data (Demultiplexed Master
mode) or Address/Data (Multiplexed Master
modes).
Parallel Master Port Read Strobe.
Parallel Master Port Write Strobe.
ST = Schmitt Trigger input buffer
I2C = I2C/SMBus input buffer
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
TABLE 1-5:
Pin
Function
PIC24FJ256GB412 FAMILY PINOUT DESCRIPTION (CONTINUED)
Pin/Pad Number
64-Pin
TQFP
100-Pin
TQFP
121-Pin
BGA
I/O
Input
Buffer
RA0
—
17
G3
I/O
ST
RA1
—
38
J6
I/O
ST
RA2
—
58
H11
I/O
ST
RA3
—
59
G10
I/O
ST
RA4
—
60
G11
I/O
ST
RA5
—
61
G9
I/O
ST
RA6
—
91
C5
I/O
ST
RA7
—
92
B5
I/O
ST
RA9
—
28
L2
I/O
ST
RA10
—
29
K3
I/O
ST
RA14
—
66
E11
I/O
ST
RA15
—
67
E8
I/O
ST
RB0
16
25
K2
I/O
ST
RB1
15
24
K1
I/O
ST
RB2
14
23
J2
I/O
ST
RB3
13
22
J1
I/O
ST
RB4
12
21
H2
I/O
ST
RB5
11
20
H1
I/O
ST
RB6
17
26
L1
I/O
ST
RB7
18
27
J3
I/O
ST
RB8
21
32
K4
I/O
ST
RB9
22
33
L4
I/O
ST
RB10
23
34
H5
I/O
ST
RB11
24
35
K5
I/O
ST
RB12
27
41
J7
I/O
ST
RB13
28
42
L7
I/O
ST
RB14
29
43
K7
I/O
ST
RB15
30
44
L8
I/O
ST
RC1
—
6
D1
I/O
ST
RC2
—
7
E4
I/O
ST
RC3
—
8
E2
I/O
ST
RC4
—
9
E1
I/O
ST
RC12
39
63
F9
I/O
ST
RC13
47
73
C10
I/O
ST
RC14
48
74
B11
I/O
ST
40
64
F11
I/O
RC15
Legend:
TTL = TTL input buffer
ANA = Analog-level input/output
 2015 Microchip Technology Inc.
Description
PORTA Digital I/Os.
PORTB Digital I/Os.
PORTC Digital I/Os.
ST
ST = Schmitt Trigger input buffer
I2C = I2C/SMBus input buffer
DS30010089C-page 43
PIC24FJ256GA412/GB412 FAMILY
TABLE 1-5:
Pin
Function
PIC24FJ256GB412 FAMILY PINOUT DESCRIPTION (CONTINUED)
Pin/Pad Number
64-Pin
TQFP
100-Pin
TQFP
121-Pin
BGA
I/O
Input
Buffer
RD0
46
72
D9
I/O
ST
RD1
49
76
A11
I/O
ST
RD2
50
77
A10
I/O
ST
RD3
51
78
B9
I/O
ST
RD4
52
81
C8
I/O
ST
RD5
53
82
B8
I/O
ST
RD6
54
83
D7
I/O
ST
RD7
55
84
C7
I/O
ST
RD8
42
68
E9
I/O
ST
RD9
43
69
E10
I/O
ST
RD10
44
70
D11
I/O
ST
RD11
45
71
C11
I/O
ST
RD12
—
79
A9
I/O
ST
RD13
—
80
D8
I/O
ST
RD14
—
47
L9
I/O
ST
RD15
—
48
K9
I/O
ST
RE0
60
93
A4
I/O
ST
RE1
61
94
B4
I/O
ST
RE2
62
98
B3
I/O
ST
RE3
63
99
A2
I/O
ST
RE4
64
100
A1
I/O
ST
RE5
1
3
D3
I/O
ST
RE6
2
4
C1
I/O
ST
Description
PORTD Digital I/Os.
PORTE Digital I/Os.
RE7
3
5
D2
I/O
ST
RE8
—
18
G1
I/O
ST
RE9
—
19
G2
I/O
ST
REFI1
24
35
K5
I
ST
External Reference Clock Input.
PORTF Digital I/Os.
RF0
58
87
B6
I/O
ST
RF1
59
88
A6
I/O
ST
RF2
—
52
K11
I/O
ST
RF3
33
51
K10
I/O
ST
RF4
31
49
L10
I/O
ST
RF5
32
50
L11
I/O
ST
RF7
34
54
H8
I/O
ST
RF8
—
53
J10
I/O
ST
RF12
—
40
K6
I/O
ST
RF13
—
39
L6
I/O
ST
Legend:
TTL = TTL input buffer
ANA = Analog-level input/output
DS30010089C-page 44
ST = Schmitt Trigger input buffer
I2C = I2C/SMBus input buffer
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
TABLE 1-5:
Pin
Function
PIC24FJ256GB412 FAMILY PINOUT DESCRIPTION (CONTINUED)
Pin/Pad Number
64-Pin
TQFP
100-Pin
TQFP
121-Pin
BGA
I/O
Input
Buffer
RG0
—
90
A5
I/O
ST
RG1
—
89
E6
I/O
ST
RG2
37
57
H10
I/O
ST
RG3
36
56
J11
I/O
ST
RG6
4
10
E3
I/O
ST
RG7
5
11
F4
I/O
ST
RG8
6
12
F2
I/O
ST
RG9
8
14
F3
I/O
ST
RG12
—
96
C3
I/O
ST
RG13
—
97
A3
I/O
ST
RG14
—
95
C4
I/O
ST
RG15
—
1
B2
I/O
ST
RH1
—
—
B1
I/O
ST
RH2
—
—
D4
I/O
ST
RH3
—
—
G4
I/O
ST
RH4
—
—
H3
I/O
ST
RH5
—
—
H4
I/O
ST
RH6
—
—
L5
I/O
ST
RH7
—
—
J5
I/O
ST
RH8
—
—
H7
I/O
ST
RH9
—
—
J8
I/O
ST
RH10
—
—
J9
I/O
ST
RH11
—
—
G8
I/O
ST
RH12
—
—
F7
I/O
ST
RH13
—
—
C9
I/O
ST
RH14
—
—
A8
I/O
ST
RH15
—
—
F6
I/O
ST
RJ0
—
—
D5
I/O
ST
RJ1
—
—
E5
I/O
ST
RP0
16
25
K2
I/O
ST
RP1
15
24
K1
I/O
ST
RP2
42
68
E9
I/O
ST
RP3
44
70
D11
I/O
ST
RP4
43
69
E10
I/O
ST
RP5
—
48
K9
I/O
ST
RP6
17
26
L1
I/O
ST
RP7
18
27
J3
I/O
ST
RP8
21
32
K4
I/O
ST
RP9
22
33
L4
I/O
ST
31
49
L10
I/O
RP10
Legend:
TTL = TTL input buffer
ANA = Analog-level input/output
 2015 Microchip Technology Inc.
Description
PORTG Digital I/Os.
PORTH Digital I/Os.
PORTJ Digital I/Os.
Remappable Peripherals (Input or Output).
ST
ST = Schmitt Trigger input buffer
I2C = I2C/SMBus input buffer
DS30010089C-page 45
PIC24FJ256GA412/GB412 FAMILY
TABLE 1-5:
Pin
Function
PIC24FJ256GB412 FAMILY PINOUT DESCRIPTION (CONTINUED)
Pin/Pad Number
121-Pin
BGA
I/O
Input
Buffer
72
D9
I
ST
71
C11
I
ST
14
23
J2
I
ST
RP14
29
43
K7
I
ST
RP15
—
53
J10
I
ST
RP16
33
51
K10
I
ST
RP17
32
50
L11
I
ST
RP18
11
20
H1
I
ST
RP19
6
12
F2
I
ST
RP20
53
82
B8
I
ST
RP21
4
10
E3
I
ST
ST
64-Pin
TQFP
100-Pin
TQFP
RP11
46
RP12
45
RP13
RP22
51
78
B9
I
RP23
50
77
A10
I
ST
RP24
49
76
A11
I
ST
RP25
52
81
C8
I
ST
RP26
5
11
F4
I
ST
RP27
8
14
F3
I
ST
RP28
12
21
H2
I
ST
RP29
30
44
L8
I
ST
RP30
—
52
K11
I
ST
RP31
—
39
L6
I
ST
Description
Remappable Peripherals (Input or Output).
RPIN32
—
40
K6
I
ST
RPIN33
—
18
G1
I
ST
Remappable Peripherals (Input Only).
RPIN34
—
19
G2
I
ST
RPIN35
—
67
E8
I
ST
RPIN36
—
66
E11
I
ST
RPIN37
48
74
B11
I
ST
RPIN38
—
6
D1
I
ST
RPIN39
—
7
E4
I
ST
RPIN40
—
8
E2
I
ST
RPIN41
—
9
E1
I
ST
RPIN42
—
79
A9
I
ST
RPIN43
—
47
L9
I
ST
RTCC
42
68
E9
O
—
Real-Time Clock Output.
SCK4
59
88
A6
I/O
ST
SPI4 Serial Clock Input/Output.
SCL1
44
66
E11
I/O
I2C
I2C1 Synchronous Serial Clock Input/Output.
SCL2
32
58
H11
I/O
I2C
I2C2 Synchronous Serial Clock Input/Output.
SCL3
2
4
C1
I/O
I2C
I2C3 Synchronous Serial Clock Input/Output.
SCLKI
48
74
B11
I
ST
Secondary Oscillator Digital Clock Input.
2
SDA1
43
67
E8
I/O
I C
I2C1 Data Input/Output.
SDA2
31
59
G10
I/O
I2C
I2C2 Data Input/Output.
SDA3
3
5
D2
I/O
I2C
I2C3 Data Input/Output.
SDI4
28
42
L7
I
ST
SPI4 Data Input.
23
34
H5
O
—
SPI4 Data Output.
SDO4
Legend:
TTL = TTL input buffer
ANA = Analog-level input/output
DS30010089C-page 46
ST = Schmitt Trigger input buffer
I2C = I2C/SMBus input buffer
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
TABLE 1-5:
Pin
Function
PIC24FJ256GB412 FAMILY PINOUT DESCRIPTION (CONTINUED)
Pin/Pad Number
64-Pin
TQFP
100-Pin
TQFP
121-Pin
BGA
I/O
Input
Buffer
SEG0
4
10
E3
O
—
SEG1
8
14
F3
O
—
SEG2
11
20
H1
O
—
SEG3
12
21
H2
O
—
SEG4
13
22
J1
O
—
SEG5
14
23
J2
O
—
SEG6
15
24
K1
O
—
SEG7
16
25
K2
O
—
SEG8
29
43
K7
O
—
SEG9
30
44
L8
O
—
SEG10
31
49
L10
O
—
SEG11
32
50
L11
O
—
SEG12
33
51
K10
O
—
SEG13
42
68
E9
O
—
SEG14
43
69
E10
O
—
SEG15
44
70
D11
O
—
SEG16
45
71
C11
O
—
SEG17
46
72
D9
O
—
SEG18
27
41
J7
O
—
SEG19
28
42
L7
O
—
SEG20
49
76
A11
O
—
SEG21
50
77
A10
O
—
SEG22
51
78
B9
O
—
SEG23
52
81
C8
O
—
SEG24
53
82
B8
O
—
SEG25
54
83
D7
O
—
SEG26
55
84
C7
O
—
SEG27
58
87
B6
O
—
SEG28
—
61
G9
O
—
SEG29
23
34
H5
O
—
SEG30
22
33
L4
O
—
SEG31
21
32
K4
O
—
SEG32
—
6
D1
O
—
SEG33
—
8
E2
O
—
SEG34
—
18
G1
O
—
SEG35
—
19
G2
O
—
SEG36
—
28
L2
O
—
SEG37
—
29
K3
O
—
SEG38
—
47
L9
O
—
SEG39
—
48
K9
O
—
SEG40
—
52
K11
O
—
Legend:
TTL = TTL input buffer
ANA = Analog-level input/output
 2015 Microchip Technology Inc.
Description
LCD Driver Segment Outputs.
ST = Schmitt Trigger input buffer
I2C = I2C/SMBus input buffer
DS30010089C-page 47
PIC24FJ256GA412/GB412 FAMILY
TABLE 1-5:
Pin
Function
PIC24FJ256GB412 FAMILY PINOUT DESCRIPTION (CONTINUED)
Pin/Pad Number
64-Pin
TQFP
100-Pin
TQFP
121-Pin
BGA
I/O
Input
Buffer
SEG41
—
53
J10
O
—
SEG42
—
66
E11
O
—
SEG43
—
67
E8
O
—
SEG44
—
79
A9
O
—
SEG45
—
80
D8
O
—
SEG46
—
89
E6
O
—
SEG47
59
88
A6
O
—
SEG48
—
17
G3
O
—
SEG49
—
90
A5
O
—
SEG50
—
1
B2
O
—
SEG51
—
7
E4
O
—
SEG52
—
9
E1
O
—
SEG53
—
39
L6
O
—
SEG54
—
40
K6
O
—
SEG55
—
58
H11
O
—
SEG56
—
59
G10
O
—
SEG57
—
91
C5
O
—
SEG58
—
92
B5
O
—
SEG59
—
95
C4
O
—
SEG60
—
96
C3
O
—
SEG61
—
97
A3
O
—
SEG62
64
100
A1
O
—
SEG63
18
27
J3
O
—
Description
LCD Driver Segment Outputs.
SOSCI
47
73
C10
I
ANA
SOSCO
48
74
B11
O
—
Secondary Oscillator Output.
SS4
24
35
K5
O
—
SPI4 Slave Select Signal.
T1CK
22
33
L4
I
ST
External Timer1 Clock Input.
TCK
27
38
J6
I
ST
JTAG Test Clock Input.
TDI
28
60
G11
I
ST
JTAG Test Data Input.
TDO
24
61
G9
O
—
JTAG Test Data Output.
TMPR
22
33
L4
I
ST
Anti-Tamper Pin.
TMS
23
17
G3
I
ST
JTAG Test Mode Select Input.
U5BCLK
55
84
C7
O
—
UART5 Baud Clock Output (IrDA® mode).
U5CTS
58
87
B6
I
ST
UART5 Clear-to-Send Input.
U5RTS
55
84
C7
O
—
UART5 Request-to-Send Output.
U5RX
54
83
D7
I
ST
UART5 Receiver Input.
U5TX
49
76
A11
O
—
UART5 Transmitter Output.
U6BCLK
42
68
E9
O
—
UART6 Baud Clock Output (IrDA mode).
U6CTS
46
72
D9
I
ST
UART6 Clear-to-Send Input.
U6RTS
42
68
E9
O
—
UART6 Request-to-Send Output.
U6RX
27
41
J7
I
ST
UART6 Receiver Input.
18
27
J3
O
—
UART6 Transmitter Output.
U6TX
Legend:
TTL = TTL input buffer
ANA = Analog-level input/output
DS30010089C-page 48
Secondary Oscillator Input.
ST = Schmitt Trigger input buffer
I2C = I2C/SMBus input buffer
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
TABLE 1-5:
Pin
Function
PIC24FJ256GB412 FAMILY PINOUT DESCRIPTION (CONTINUED)
Pin/Pad Number
64-Pin
TQFP
100-Pin
TQFP
121-Pin
BGA
I/O
Input
Buffer
Description
USBID
33
51
K10
I
ST
USB OTG ID (OTG mode only).
USBOE
12
21
H2
O
—
USB Transceiver Output Enable Flag.
VBAT
57
86
A7
P
—
Backup Battery (B+) Input.
VBUS
34
54
H8
P
—
USB VBUS Connection (5V Nominal).
VCAP
56
85
B7
P
—
External Filter Capacitor Pin.
VDD
10, 26, 38
2, 16, 37,
46, 62
C2, G5, H6,
K8, F8, E7,
D6
P
—
Positive Supply for Digital Logic and I/O Pins.
VLCAP1
5
11
F4
P
ANA
VLCAP2
6
12
F2
P
ANA
VREF+
16
25, 29
K2, K3
I
ANA
Analog Voltage Reference Input (High).
VREF-
15
24, 28
K1, L2
I
ANA
Analog Voltage Reference Input (Low).
9, 25, 41
15, 36, 45,
65, 75
F5, G6, G7,
F10, D10,
B10, C6
P
—
Ground Reference for Digital Logic and I/O Pins.
35
55
H9
P
—
USB Transceiver Power Input (3.3V Nominal).
VSS
VUSB3V3
Legend:
TTL = TTL input buffer
ANA = Analog-level input/output
 2015 Microchip Technology Inc.
LCD Driver Charge Pump Capacitor Pins.
ST = Schmitt Trigger input buffer
I2C = I2C/SMBus input buffer
DS30010089C-page 49
PIC24FJ256GA412/GB412 FAMILY
NOTES:
DS30010089C-page 50
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
The following pins must always be connected:
• All VDD and VSS pins
(see Section 2.2 “Power Supply Pins”)
• All analog power pins (AVDD and AVSS), regardless of
whether or not the analog device features are used
(see Section 2.2 “Power Supply Pins”)
• The USB transceiver supply, VUSB3V3, regardless
of whether or not the USB module is used
(see Section 2.2 “Power Supply Pins”)
• MCLR pin
(see Section 2.3 “Master Clear (MCLR) Pin”)
• VCAP pin
(see Section 2.4 “Voltage Regulator Pin (VCAP)”)
These pins must also be connected if they are being
used in the end application:
• PGECx/PGEDx pins used for In-Circuit Serial
Programming™ (ICSP™) and debugging purposes
(see Section 2.5 “ICSP Pins”)
• OSCI and OSCO pins when an external oscillator
source is used
(see Section 2.6 “External Oscillator Pins”)
C2(2)
VDD
R1
R2
MCLR
Note:
All analog power supply and return pins
must always be connected, regardless of
whether any of the analog modules are
being used.
VCAP
(4)
C1
C7(1)
PIC24FJXXXXX
C6(2)
VSS
VUSB3V3
VDD
VSS
C3(3)
C5(2)
Key (all values are recommendations):
C1 through C6: 0.1 F, 20V ceramic
C7: 10 F, 6.3V or greater, tantalum or ceramic
R1: 10 kΩ
R2: 100Ω to 470Ω
Note 1:
2:
Additionally, the following pins may be required:
• Any voltage reference pins used when external
voltage reference for analog modules is
implemented (AVREF+/AVREF-, CVREF+/CVREFand DVREF+)
VSS
Getting started with the PIC24FJ256GA412/GB412
family of 16-bit microcontrollers requires attention to a
minimal set of device pin connections before
proceeding with development.
RECOMMENDED
MINIMUM CONNECTIONS
VDD
Basic Connection Requirements
FIGURE 2-1:
AVSS
2.1
GUIDELINES FOR GETTING
STARTED WITH 16-BIT
MICROCONTROLLERS
AVDD
2.0
3:
4:
See Section 2.4 “Voltage Regulator Pin
(VCAP)” for details on selecting the proper
capacitor for VCAP.
The example shown is for a PIC24F device
with five power and ground pairs (including
analog and USB). Other devices may have
more or less pairs; adjust the number of
decoupling capacitors appropriately.
Implemented on PIC24FJXXXGB4XX
devices only. See Section 20.1 “Hardware
Configuration” for details on connecting the
pins for USB operation.
C1 is optional, see Section 2.3 “Master
Clear (MCLR) Pin” and Section 2.5 “ICSP
Pins” for more information.
The minimum mandatory connections are shown in
Figure 2-1.
 2015 Microchip Technology Inc.
DS30010089C-page 51
PIC24FJ256GA412/GB412 FAMILY
2.2
2.2.1
Power Supply Pins
DECOUPLING CAPACITORS
The use of decoupling capacitors on every pair of
power supply pins is required. This includes digital
supply (VDD and VSS) and all analog supplies (AVDD
and AVSS).
Consider the following criteria when using decoupling
capacitors:
• Value and type of capacitor: A 0.1 F (100 nF),
10-20V capacitor is recommended. The capacitor
should be a low-ESR device with a resonance
frequency in the range of 200 MHz and higher.
Ceramic capacitors are recommended.
• Placement on the printed circuit board: The
decoupling capacitors should be placed as close
to the pins as possible. It is recommended to
place the capacitors on the same side of the
board as the device. If space is constricted, the
capacitor can be placed on another layer on the
PCB using a via; however, ensure that the trace
length from the pin to the capacitor is no greater
than 0.25 inch (6 mm).
• Handling high-frequency noise: If the board is
experiencing high-frequency noise (upward of
tens of MHz), add a second ceramic type capacitor in parallel to the above described decoupling
capacitor. The value of the second capacitor can
be in the range of 0.01 F to 0.001 F. Place this
second capacitor next to each primary decoupling
capacitor. In high-speed circuit designs, consider
implementing a pair of capacitances as close to
the power and ground pins as possible
(e.g., 0.1 F in parallel with 0.001 F).
• Maximizing performance: On the board layout
from the power supply circuit, run the power and
return traces to the decoupling capacitors first,
and then to the device pins. This ensures that the
decoupling capacitors are first in the power chain.
Equally important is to keep the trace length
between the capacitor and the power pins to a
minimum, thereby reducing PCB trace
inductance.
2.2.2
BULK CAPACITORS
On boards with power traces running longer than six
inches in length, it is suggested to use a tank capacitor
for integrated circuits including microcontrollers to
supply a local power source. The value of the tank
capacitor should be determined based on the trace
resistance that connects the power supply source to
the device, and the maximum current drawn by the
device in the application. In other words, select the tank
capacitor so that it meets the acceptable voltage sag at
the device. Typical values range from 4.7 F to 47 F.
DS30010089C-page 52
2.3
Master Clear (MCLR) Pin
The MCLR pin provides two specific device functions:
device Reset, and device programming and debugging. If programming and debugging are not required
in the end application, a direct connection to VDD may
be all that is required. The addition of other components, to help increase the application’s resistance to
spurious Resets from voltage sags, may be beneficial.
A typical configuration is shown in Figure 2-1. Other
circuit designs may be implemented, depending on the
application’s requirements.
During programming and debugging, the resistance
and capacitance that can be added to the pin must
be considered. Device programmers and debuggers
drive the MCLR pin. Consequently, specific voltage
levels (VIH and VIL) and fast signal transitions must
not be adversely affected. Therefore, specific values
of R1 and C1 will need to be adjusted based on the
application and PCB requirements. For example, it is
recommended that the capacitor, C1, be isolated
from the MCLR pin during programming and debugging operations by using a jumper (Figure 2-2). The
jumper is replaced for normal run-time operations.
Any components associated with the MCLR pin
should be placed within 0.25 inch (6 mm) of the pin.
FIGURE 2-2:
EXAMPLE OF MCLR PIN
CONNECTIONS
VDD
R1
R2
MCLR
JP
PIC24FJXXXXX
C1
Note 1: R1  10 k is recommended. A suggested
starting value is 10 k. Ensure that the MCLR
pin VIH and VIL specifications are met.
2: R2  470 will limit any current flowing into
MCLR from the external capacitor, C, in the
event of MCLR pin breakdown, due to
Electrostatic Discharge (ESD) or Electrical
Overstress (EOS). Ensure that the MCLR pin
VIH and VIL specifications are met.
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
2.4
Voltage Regulator Pin (VCAP)
FIGURE 2-3:
A low-ESR (< 5Ω) capacitor is required on the VCAP pin
to stabilize the output voltage of the on-chip voltage
regulator. The VCAP pin must not be connected to VDD
and must use a capacitor of 10 µF connected to ground.
The type can be ceramic or tantalum. Suitable examples
of capacitors are shown in Table 2-1. Capacitors with
equivalent specification can be used.
FREQUENCY vs. ESR
PERFORMANCE FOR
SUGGESTED VCAP
10
ESR ()
1
The placement of this capacitor should be close to VCAP.
It is recommended that the trace length not exceed
0.25 inch (6 mm). Refer to Section 36.0 “Electrical
Characteristics” for additional information.
0.1
0.01
Designers may use Figure 2-3 to evaluate ESR
equivalence of candidate devices.
0.001
Refer to Section 33.2 “On-Chip Voltage Regulator”
for details on connecting and using the on-chip
regulator.
Note:
0.01
0.1
1
10
100
Frequency (MHz)
1000 10,000
Typical data measurement at +25°C, 0V DC bias.
.
TABLE 2-1:
SUITABLE CAPACITOR EQUIVALENTS
Make
Part #
Nominal
Capacitance
Base Tolerance
Rated Voltage
Temp. Range
TDK
C3216X7R1C106K
10 µF
±10%
16V
-55 to +125ºC
TDK
C3216X5R1C106K
10 µF
±10%
16V
-55 to +85ºC
Panasonic
ECJ-3YX1C106K
10 µF
±10%
16V
-55 to +125ºC
Panasonic
ECJ-4YB1C106K
10 µF
±10%
16V
-55 to +85ºC
Murata
GRM32DR71C106KA01L
10 µF
±10%
16V
-55 to +125ºC
Murata
GRM31CR61C106KC31L
10 µF
±10%
16V
-55 to +85ºC
 2015 Microchip Technology Inc.
DS30010089C-page 53
PIC24FJ256GA412/GB412 FAMILY
CONSIDERATIONS FOR CERAMIC
CAPACITORS
In recent years, large value, low-voltage, surface-mount
ceramic capacitors have become very cost effective in
sizes up to a few tens of microfarad. The low-ESR, small
physical size and other properties make ceramic
capacitors very attractive in many types of applications.
Ceramic capacitors are suitable for use with the internal voltage regulator of this microcontroller. However,
some care is needed in selecting the capacitor to
ensure that it maintains sufficient capacitance over the
intended operating range of the application.
Typical low-cost, 10 F ceramic capacitors are available
in X5R, X7R and Y5V dielectric ratings (other types are
also available, but are less common). The initial tolerance specifications for these types of capacitors are
often specified as ±10% to ±20% (X5R and X7R), or
-20%/+80% (Y5V). However, the effective capacitance
that these capacitors provide in an application circuit will
also vary based on additional factors, such as the
applied DC bias voltage and the temperature. The total
in-circuit tolerance is, therefore, much wider than the
initial tolerance specification.
The X5R and X7R capacitors typically exhibit satisfactory temperature stability (i.e., ±15% over a wide
temperature range, but consult the manufacturer’s data
sheets for exact specifications). However, Y5V capacitors typically have extreme temperature tolerance
specifications of +22%/-82%. Due to the extreme
temperature tolerance, a 10 F nominal rated Y5V type
capacitor may not deliver enough total capacitance to
meet minimum internal voltage regulator stability and
transient response requirements. Therefore, Y5V
capacitors are not recommended for use with the
internal regulator if the application must operate over a
wide temperature range.
In addition to temperature tolerance, the effective
capacitance of large value ceramic capacitors can vary
substantially, based on the amount of DC voltage
applied to the capacitor. This effect can be very significant, but is often overlooked or is not always
documented.
Typical DC bias voltage vs. capacitance graph for X7R
type capacitors is shown in Figure 2-4.
When selecting a ceramic capacitor to be used with the
internal voltage regulator, it is suggested to select a
high-voltage rating, so that the operating voltage is a
small percentage of the maximum rated capacitor voltage. For example, choose a ceramic capacitor rated at
16V for the 2.5V or 1.8V core voltage. Suggested
capacitors are shown in Table 2-1.
DS30010089C-page 54
FIGURE 2-4:
Capacitance Change (%)
2.4.1
DC BIAS VOLTAGE vs.
CAPACITANCE
CHARACTERISTICS
10
0
-10
16V Capacitor
-20
-30
-40
10V Capacitor
-50
-60
-70
6.3V Capacitor
-80
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
DC Bias Voltage (VDC)
2.5
ICSP Pins
The PGECx and PGEDx pins are used for In-Circuit
Serial Programming (ICSP) and debugging purposes.
It is recommended to keep the trace length between
the ICSP connector and the ICSP pins on the device as
short as possible. If the ICSP connector is expected to
experience an ESD event, a series resistor is recommended, with the value in the range of a few tens of
ohms, not to exceed 100Ω.
Pull-up resistors, series diodes and capacitors on the
PGECx and PGEDx pins are not recommended as they
will interfere with the programmer/debugger communications to the device. If such discrete components are
an application requirement, they should be removed
from the circuit during programming and debugging.
Alternatively, refer to the AC/DC characteristics and
timing requirements information in the respective
device Flash programming specification for information
on capacitive loading limits and pin Voltage Input High
(VIH) and Voltage Input Low (VIL) requirements.
For device emulation, ensure that the “Communication
Channel Select” (i.e., PGECx/PGEDx pins), programmed
into the device, matches the physical connections for the
ICSP to the Microchip debugger/emulator tool.
The MCLR connection from the ICSP header should connect directly to the MCLR pin on the device. A capacitor to
ground (C1 in Figure 2-2) is optional, but if used, may
interfere with ICSP operation if the value exceeds 0.01 F.
In most cases, this capacitor is not required.
For more information on available Microchip
development tools connection requirements, refer to
Section 34.0 “Development Support”.
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
2.6
External Oscillator Pins
FIGURE 2-5:
Many microcontrollers have options for at least two
oscillators: a high-frequency primary oscillator and a
low-frequency
secondary oscillator
(refer to
Section 9.0 “Oscillator Configuration” for details).
The oscillator circuit should be placed on the same
side of the board as the device. Place the oscillator
circuit close to the respective oscillator pins with no
more than 0.5 inch (12 mm) between the circuit
components and the pins. The load capacitors should
be placed next to the oscillator itself, on the same side
of the board.
Use a grounded copper pour around the oscillator
circuit to isolate it from surrounding circuits. The
grounded copper pour should be routed directly to the
MCU ground. Do not run any signal traces or power
traces inside the ground pour. Also, if using a two-sided
board, avoid any traces on the other side of the board
where the crystal is placed.
Layout suggestions are shown in Figure 2-5. In-line
packages may be handled with a single-sided layout
that completely encompasses the oscillator pins. With
fine-pitch packages, it is not always possible to completely surround the pins and components. A suitable
solution is to tie the broken guard sections to a mirrored
ground layer. In all cases, the guard trace(s) must be
returned to ground.
In planning the application’s routing and I/O assignments, ensure that adjacent port pins, and other
signals in close proximity to the oscillator, are benign
(i.e., free of high frequencies, short rise and fall times,
and other similar noise).
For additional information and design guidance on
oscillator circuits, please refer to these Microchip
Application Notes, available at the corporate web site
(www.microchip.com):
• AN943, “Practical PICmicro® Oscillator Analysis
and Design”
• AN949, “Making Your Oscillator Work”
• AN1798, “Crystal Selection for Low-Power
Secondary Oscillator”
SUGGESTED
PLACEMENT OF THE
OSCILLATOR CIRCUIT
Single-Sided and In-Line Layouts:
Copper Pour
(tied to ground)
Primary Oscillator
Crystal
DEVICE PINS
Primary
Oscillator
OSCI
C1
`
OSCO
GND
C2
`
SOSCO
SOSC I
Secondary
Oscillator
Crystal
`
Sec Oscillator: C1
Sec Oscillator: C2
Fine-Pitch (Dual-Sided) Layouts:
Top Layer Copper Pour
(tied to ground)
Bottom Layer
Copper Pour
(tied to ground)
OSCO
C2
Oscillator
Crystal
GND
C1
OSCI
DEVICE PINS
 2015 Microchip Technology Inc.
DS30010089C-page 55
PIC24FJ256GA412/GB412 FAMILY
2.7
Configuration of Analog and
Digital Pins During ICSP
Operations
When a Microchip debugger/emulator is used as a
programmer, the user application must correctly
configure the ANSx registers. Automatic initialization of
these registers is only done during debugger operation.
Failure to correctly configure the register(s) will result in
all A/D pins being recognized as analog input pins,
resulting in the port value being read as a logic ‘0’,
which may affect user application functionality.
If an ICSP compliant emulator is selected as a debugger, it automatically initializes all of the A/D input pins
(ANx) as “digital” pins. This is done by clearing all bits
in the ANSx registers. Refer to Section 11.2 “Configuring Analog Port Pins (ANSx)” for more specific
information.
2.8
The bits in these registers that correspond to the A/D
pins that initialized the emulator must not be changed
by the user application; otherwise, communication
errors will result between the debugger and the device.
Unused I/O pins should be configured as outputs and
driven to a logic low state. Alternatively, connect a 1 kΩ
to 10 kΩ resistor to VSS on unused pins and drive the
output to logic low.
Unused I/Os
If your application needs to use certain A/D pins as
analog input pins during the debug session, it must set
the bits corresponding to the pin(s) to be configured as
analog. Do not change any other bits, particularly those
corresponding to the PGECx/PGEDx pair, at any time.
DS30010089C-page 56
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
3.0
Note:
CPU
This data sheet summarizes the features of
this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information on the CPU,
refer to the “dsPIC33/PIC24 Family Reference Manual”, “CPU with Extended Data
Space (EDS)” (DS39732). The information
in this data sheet supersedes the
information in the FRM.
The PIC24F CPU has a 16-bit (data) modified Harvard
architecture with an enhanced instruction set and a
24-bit instruction word with a variable length opcode
field. The Program Counter (PC) is 23 bits wide and
addresses up to 4M instructions of user program
memory space. A single-cycle instruction prefetch
mechanism is used to help maintain throughput and
provides predictable execution. All instructions execute
in a single cycle, with the exception of instructions that
change the program flow, the double-word move
(MOV.D) instruction and the table instructions.
Overhead-free program loop constructs are supported
using the REPEAT instructions, which are interruptible
at any point.
PIC24F devices have sixteen, 16-bit Working registers
in the programmer’s model. Each of the Working
registers can act as a data, address or address offset
register. The 16th Working register (W15) operates as
a Software Stack Pointer (SSP) for interrupts and calls.
The lower 32 Kbytes of the Data Space (DS) can be
accessed linearly. The upper 32 Kbytes of the Data
Space are referred to as Extended Data Space to which
the extended data RAM, EPMP memory space or
program memory can be mapped.
The Instruction Set Architecture (ISA) has been
significantly enhanced beyond that of the PIC18, but
maintains an acceptable level of backward compatibility. All PIC18 instructions and addressing modes are
supported, either directly, or through simple macros.
Many of the ISA enhancements have been driven by
compiler efficiency needs.
 2015 Microchip Technology Inc.
The core supports Inherent (no operand), Relative,
Literal and Memory Direct Addressing modes, along
with three groups of addressing modes. All modes support Register Direct and various Register Indirect
modes. Each group offers up to seven addressing
modes. Instructions are associated with predefined
addressing modes depending upon their functional
requirements.
For most instructions, the core is capable of executing
a data (or program data) memory read, a Working register (data) read, a data memory write and a program
(instruction) memory read per instruction cycle. As a
result, three parameter instructions can be supported,
allowing trinary operations (that is, A + B = C) to be
executed in a single cycle.
A high-speed, 17-bit x 17-bit multiplier has been
included to significantly enhance the core arithmetic
capability and throughput. The multiplier supports
Signed, Unsigned and Mixed mode, 16-bit x 16-bit or
8-bit x 8-bit, integer multiplication. All multiply
instructions execute in a single cycle.
The 16-bit ALU has been enhanced with integer divide
assist hardware that supports an iterative non-restoring
divide algorithm. It operates in conjunction with the
REPEAT instruction looping mechanism and a selection
of iterative divide instructions to support 32-bit (or
16-bit), divided by 16-bit, integer signed and unsigned
division. All divide operations require 19 cycles to
complete but are interruptible at any cycle boundary.
The PIC24F has a vectored exception scheme with up
to 8 sources of non-maskable traps and up to 118 interrupt sources. Each interrupt source can be assigned to
one of seven priority levels.
A block diagram of the CPU is shown in Figure 3-1.
3.1
Programmer’s Model
The programmer’s model for the PIC24F is shown in
Figure 3-2. All registers in the programmer’s model are
memory-mapped and can be manipulated directly by
instructions.
A description of each register is provided in Table 3-1.
All registers associated with the programmer’s model
are memory-mapped.
DS30010089C-page 57
PIC24FJ256GA412/GB412 FAMILY
FIGURE 3-1:
PIC24F CPU CORE BLOCK DIAGRAM
EDS and Table
Data Access
Control Block
Data Bus
Interrupt
Controller
16
8
16
16
Data Latch
23
Data RAM
Up to 0x7FFF
PCL
PCH
Program Counter
Loop
Stack
Control
Control
Logic
Logic
23
16
Address
Latch
23
16
RAGU
WAGU
Address Latch
Program Memory/
Extended Data
Space
EA MUX
Address Bus
Data Latch
ROM Latch
24
Instruction
Decode and
Control
Instruction Reg
Control Signals
to Various Blocks
Hardware
Multiplier
Divide
Support
16
Literal Data
16
16 x 16
W Register Array
16
16-Bit ALU
16
To Peripheral Modules
TABLE 3-1:
CPU CORE REGISTERS
Register(s) Name
W0 through W15
PC
SR
SPLIM
TBLPAG
RCOUNT
CORCON
DISICNT
DSRPAG
DSWPAG
DS30010089C-page 58
Description
Working Register Array
23-Bit Program Counter
ALU STATUS Register
Stack Pointer Limit Value Register
Table Memory Page Address Register
REPEAT Loop Counter Register
CPU Control Register
Disable Interrupt Count Register
Data Space Read Page Register
Data Space Write Page Register
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
FIGURE 3-2:
PROGRAMMER’S MODEL
15
Divider Working Registers
0
W0 (WREG)
W1
W2
Multiplier Registers
W3
W4
W5
W6
W7
Working/Address
Registers
W8
W9
W10
W11
W12
W13
W14
Frame Pointer
W15
Stack Pointer
0
SPLIM
0
22
0
0
PC
7
0
TBLPAG
9
Program Counter
Table Memory Page
Address Register
0
Data Space Read Page Register
DSRPAG
8
0
Data Space Write Page Register
DSWPAG
15
0
RCOUNT
15
Stack Pointer Limit
Value Register
SRL
SRH
0
— — — — — — — DC 2 IPL
1 0 RA N OV Z C
0
15
— — — — — — — — — — — — IPL3 — — —
13
REPEAT Loop Counter
Register
ALU STATUS Register (SR)
CPU Control Register (CORCON)
0
DISICNT
Disable Interrupt Count Register
Registers or bits are shadowed for PUSH.S and POP.S instructions.
 2015 Microchip Technology Inc.
DS30010089C-page 59
PIC24FJ256GA412/GB412 FAMILY
3.2
CPU Control Registers
REGISTER 3-1:
SR: ALU STATUS REGISTER
U-0
U-0
U-0
U-0
U-0
U-0
U-0
R/W-0
—
—
—
—
—
—
—
DC
bit 15
bit 8
R/W-0(1)
IPL2
R/W-0(1)
(2)
(2)
IPL1
R/W-0(1)
IPL0
(2)
R-0
R/W-0
R/W-0
R/W-0
R/W-0
RA
N
OV
Z
C
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-9
Unimplemented: Read as ‘0’
bit 8
DC: ALU Half Carry/Borrow bit
1 = A carry out from the 4th low-order bit (for byte-sized data) or 8th low-order bit (for word-sized data)
of the result occurred
0 = No carry out from the 4th or 8th low-order bit of the result has occurred
bit 7-5
IPL<2:0>: CPU Interrupt Priority Level Status bits(1,2)
111 = CPU Interrupt Priority Level is 7 (15); user interrupts are disabled
110 = CPU Interrupt Priority Level is 6 (14)
101 = CPU Interrupt Priority Level is 5 (13)
100 = CPU Interrupt Priority Level is 4 (12)
011 = CPU Interrupt Priority Level is 3 (11)
010 = CPU Interrupt Priority Level is 2 (10)
001 = CPU Interrupt Priority Level is 1 (9)
000 = CPU Interrupt Priority Level is 0 (8)
bit 4
RA: REPEAT Loop Active bit
1 = REPEAT loop is in progress
0 = REPEAT loop is not in progress
bit 3
N: ALU Negative bit
1 = Result was negative
0 = Result was not negative (zero or positive)
bit 2
OV: ALU Overflow bit
1 = Overflow occurred for signed (2’s complement) arithmetic in this arithmetic operation
0 = No overflow has occurred
bit 1
Z: ALU Zero bit
1 = An operation, which affects the Z bit, has set it at some time in the past
0 = The most recent operation, which affects the Z bit, has cleared it (i.e., a non-zero result)
bit 0
C: ALU Carry/Borrow bit
1 = A carry out from the Most Significant bit (MSb) of the result occurred
0 = No carry out from the Most Significant bit of the result occurred
Note 1:
2:
The IPLx Status bits are read-only when NSTDIS (INTCON1<15>) = 1.
The IPLx Status bits are concatenated with the IPL3 Status (CORCON<3>) bit to form the CPU Interrupt
Priority Level (IPL). The value in parentheses indicates the IPL when IPL3 = 1.
DS30010089C-page 60
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 3-2:
CORCON: CPU CORE CONTROL REGISTER
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
U-0
U-0
U-0
U-0
R/C-0
r-1
U-0
U-0
—
—
—
—
IPL3(1)
—
—
—
bit 7
bit 0
Legend:
C = Clearable bit
r = Reserved bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-4
Unimplemented: Read as ‘0’
bit 3
IPL3: CPU Interrupt Priority Level Status bit(1)
1 = CPU Interrupt Priority Level is greater than 7
0 = CPU Interrupt Priority Level is 7 or less
bit 2
Reserved: Read as ‘1’
bit 1-0
Unimplemented: Read as ‘0’
Note 1:
x = Bit is unknown
The IPL3 bit is concatenated with the IPL<2:0> bits (SR<7:5>) to form the CPU Interrupt Priority Level;
see Register 3-1 for bit description.
 2015 Microchip Technology Inc.
DS30010089C-page 61
PIC24FJ256GA412/GB412 FAMILY
3.3
Arithmetic Logic Unit (ALU)
The PIC24F ALU is 16 bits wide and is capable of addition, subtraction, bit shifts and logic operations. Unless
otherwise mentioned, arithmetic operations are 2’s
complement in nature. Depending on the operation, the
ALU may affect the values of the Carry (C), Zero (Z),
Negative (N), Overflow (OV) and Digit Carry (DC)
Status bits in the SR register. The C and DC Status bits
operate as Borrow and Digit Borrow bits, respectively,
for subtraction operations.
The ALU can perform 8-bit or 16-bit operations
depending on the mode of the instruction that is used.
Data for the ALU operation can come from the W
register array, or data memory, depending on the
addressing mode of the instruction. Likewise, output
data from the ALU can be written to the W register array
or a data memory location.
The PIC24F CPU incorporates hardware support for
both multiplication and division. This includes a
dedicated hardware multiplier and support hardware
for 16-bit divisor division.
3.3.1
MULTIPLIER
The ALU contains a high-speed, 17-bit x 17-bit
multiplier. It supports unsigned, signed or mixed sign
operation in several multiplication modes:
•
•
•
•
•
•
•
16-bit x 16-bit signed
16-bit x 16-bit unsigned
16-bit signed x 5-bit (literal) unsigned
16-bit unsigned x 16-bit unsigned
16-bit unsigned x 5-bit (literal) unsigned
16-bit unsigned x 16-bit signed
8-bit unsigned x 8-bit unsigned
TABLE 3-2:
3.3.2
DIVIDER
The divide block supports 32-bit/16-bit and 16-bit/16-bit
signed and unsigned integer divide operations with the
following data sizes:
1.
2.
3.
4.
32-bit signed/16-bit signed divide
32-bit unsigned/16-bit unsigned divide
16-bit signed/16-bit signed divide
16-bit unsigned/16-bit unsigned divide
The quotient for all divide instructions ends up in W0
and the remainder in W1. The 16-bit signed and
unsigned DIV instructions can specify any W register
for both the 16-bit divisor (Wn), and any W register
(aligned) pair (W(m + 1):Wm) for the 32-bit dividend.
The divide algorithm takes one cycle per bit of divisor,
so both 32-bit/16-bit and 16-bit/16-bit instructions take
the same number of cycles to execute.
3.3.3
MULTIBIT SHIFT SUPPORT
The PIC24F ALU supports both single bit and
single-cycle, multibit arithmetic and logic shifts. Multibit
shifts are implemented using a shifter block, capable of
performing up to a 15-bit arithmetic right shift, or up to
a 15-bit left shift, in a single cycle. All multibit shift
instructions only support Register Direct Addressing for
both the operand source and result destination.
A full summary of instructions that use the shift
operation is provided in Table 3-2.
INSTRUCTIONS THAT USE THE SINGLE BIT AND MULTIBIT SHIFT OPERATION
Instruction
Description
ASR
Arithmetic Shift Right Source register by one or more bits.
SL
Shift Left Source register by one or more bits.
LSR
Logical Shift Right Source register by one or more bits.
DS30010089C-page 62
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
4.0
MEMORY ORGANIZATION
derived from either the 23-bit Program Counter (PC)
during program execution, or from table operation or
Data Space remapping, as described in Section 4.4
“Interfacing Program and Data Memory Spaces”.
As Harvard architecture devices, PIC24F microcontrollers feature separate program and data memory
spaces and buses. This architecture also allows direct
access of program memory from the Data Space (DS)
during code execution.
4.1
User access to the program memory space is restricted
to the lower half of the address range (000000h to
7FFFFFh). The exception is the use of TBLRD/TBLWT
operations, which use TBLPAG<7> to permit access to
the Configuration bits and Device ID sections of the
configuration memory space.
Program Memory Space
The program address memory space of the
PIC24FJ256GA412/GB412 family devices is 4M
instructions. The space is addressable by a 24-bit value
FIGURE 4-1:
DEFAULT PROGRAM MEMORY MAPS FOR PIC24FJ256GA412/GB412 FAMILY
PIC24FJ64GA4/GB4XX
PIC24FJ128GA4/GB4XX
PIC24FJ256GA4/GB4XX
GOTO Instruction
Reset Address
GOTO Instruction
Reset Address
GOTO Instruction
Reset Address
Interrupt Vector Table
Interrupt Vector Table
Interrupt Vector Table
User Flash
Program Memory
(22K Instructions)
Flash Config. Words
User Memory Space
Memory maps for PIC24FJ256GA412/GB412 family
devices are shown in Figure 4-1.
User Flash
Program Memory
(44K Instructions)
Configuration Memory Space
User Flash
Program Memory
(88K Instructions)
0000FEh
000100h
000104h
0001FEh
000200h
00ABFEh
00AC00h
0157FEh
015800h
Flash Config. Words
Flash Config. Words
Unimplemented
Read ‘0’
Unimplemented
Read ‘0’
Note:
000000h
000002h
000004h
02AFFEh
02B000h
Unimplemented
Read ‘0’
7FFFFEh
800000h
8000FEh
800100h
800BFEh
800C00h
Executive Code Memory
Executive Code Memory
Executive Code Memory
OTP Memory
OTP Memory
OTP Memory
80137Eh
801380h
8013FEh
801400h
FBOOT
FBOOT
FBOOT
8017FEh
801800h
801802h
801804h
Reserved
Reserved
Reserved
Device Config. Registers
Device Config. Registers
DEVID (2)
DEVID (2)
Device Config. Registers
F7FFFEh
F80000h
F80026h
F80028h
FEFFFEh
FF0000h
DEVID (2)
FFFFFEh
Shaded areas are reserved. Memory areas are not shown to scale.
 2015 Microchip Technology Inc.
DS30010089C-page 63
PIC24FJ256GA412/GB412 FAMILY
4.1.1
PROGRAM MEMORY
ORGANIZATION
4.1.3
The program memory space is organized in
word-addressable blocks. Although it is treated as
24 bits wide, it is more appropriate to think of each
address of the program memory as a lower and upper
word, with the upper byte of the upper word being
unimplemented. The lower word always has an even
address, while the upper word has an odd address
(Figure 4-2).
The PIC24FJ256GA412/GB412 family of devices
supports a Single Partition Flash mode and two Dual
Partition Flash modes. The Dual Partition modes allow
the device to be programmed with two separate
applications to facilitate bootloading or to allow an
application to be programmed at run-time without
stalling the CPU.
In the Dual Partition modes, the device’s memory is
divided evenly into two physical sections, known as
Partition 1 and Partition 2. Each of these partitions contains its own program memory and Configuration
Words. During program execution, the code on only
one of these panels is executed; this is the Active
Partition. The other partition, or the Inactive Partition, is
not used, but can be programmed.
Program memory addresses are always word-aligned
on the lower word and addresses are incremented or
decremented by two during code execution. This
arrangement also provides compatibility with data
memory space addressing and makes it possible to
access data in the program memory space.
4.1.2
HARD MEMORY VECTORS
The Active Partition is always mapped to logical
address, 000000h, while the Inactive Partition will
always be mapped to logical address, 400000h. Note
that even when the code partitions are switched
between active and inactive by the user, the address of
the Active Partition will still be 000000h and the
address of the Inactive Partition will still be at 400000h.
Figure 4-3 compares the mapping of the user memory
space in Single and Dual Partition devices.
All PIC24F devices reserve the addresses between
000000h and 000200h for hard-coded program execution vectors. A hardware Reset vector is provided to
redirect code execution from the default value of the
PC on device Reset to the actual start of code. A GOTO
instruction is programmed by the user at 000000h with
the actual address for the start of code at 000002h.
PIC24F devices also have two Interrupt Vector Tables
(IVTs). The main IVT has a static location, from
000004h to 0000FFh. The Alternate IVT has a configurable location and is optionally enabled. A more
detailed discussion of the Interrupt Vector Tables is
provided in Section 8.0 “Interrupt Controller”.
FIGURE 4-2:
msw
Address
PROGRAM MEMORY ORGANIZATION
16
8
PC Address
(lsw Address)
0
0x000000
0x000002
0x000004
0x000006
00000000
00000000
00000000
00000000
Program Memory
‘Phantom’ Byte
(read as ‘0’)
DS30010089C-page 64
least significant word
most significant word
23
0x000001
0x000003
0x000005
0x000007
SINGLE AND DUAL PARTITION
MEMORY ORGANIZATION
Instruction Width
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
PROGRAM MEMORY MAPS FOR SINGLE AND DUAL PARTITION FLASH MODES
Single Partition Flash Mode
Dual Partition Flash Modes
000000h
000000h
User Flash Program
Memory
User Flash Program
Memory
0xxxFEh(1)
0xxx00h(1)
User Memory Space
Flash Config Words
Flash Config Words
0xxxFEh(1)
0xxx00h(1)
Unimplemented
Read ‘0’
Active Partition
FIGURE 4-3:
User Flash Program
Memory
Unimplemented
Read ‘0’
4xxxFEh(1)
4xxx00h(1)
Flash Config Words
Unimplemented
Read ‘0’
7FFFFFh
Inactive Partition
400000h
7FFFFFh
Legend: Memory areas are not shown to scale.
Note 1: Exact boundary addresses are determined by the size of the implemented program memory. See Table 4-1 for details.
TABLE 4-1:
PROGRAM MEMORY SIZES AND BOUNDARIES
Program Memory Upper Boundary (Instruction Words)
Device
Single Partition
Flash Mode
Dual Partition Flash Mode
Active Partition
Write
Blocks(1)
Erase
Blocks(1)
Inactive Partition
PIC24FJ256GX4XX
02AFFEh (88K)
0157FEh(44K)
0157FEh(44K)
1376
172
PIC24FJ128GX4XX
0157FEh(44K)
00ABFEh (22K)
00ABFEh (22K)
688
86
PIC24FJ64GX4XX
00AFFEh (22K)
0057FEh (11K)
0057FEh (11K)
352
44
Note 1:
One Write Block = 64 Instruction Words; One Erase Block = 512 Instruction Words.
The Boot Sequence Configuration Words (FBTSEQ)
determine whether Partition 1 or Partition 2 will be active
after Reset. If the part is operating in Dual Partition
mode, the partition with the lower boot sequence number will operate as the Active Panel (FBTSEQ is unused
in Single Partition mode). The partitions can be switched
between Active and Inactive by reprogramming their
boot sequence numbers, but the Active Partition will not
change until a device Reset is performed. If both boot
sequence numbers are the same, or if both are
corrupted, the part will use Partition 1 as the Active Partition. If only one boot sequence number is corrupted,
the device will use the partition without a corrupted boot
sequence number as the Active Partition.
 2015 Microchip Technology Inc.
The user can also change which partition is active at
run time using the BOOTSWP instruction. Issuing a
BOOTSWP instruction does not affect which partition will
be the Active Partition after a Reset. Figure 4-4 demonstrates how the relationship between Partitions 1 and 2,
shown in red and blue respectively, and the Active and
Inactive Partitions are affected by reprogramming the
boot sequence number or issuing a BOOTSWP
instruction.
The P2ACTIV bit (NVMCON<10>) can be used to determine which physical partition is the Active Partition. If
P2ACTIV = 1, Partition 2 is active; if P2ACTIV = 0,
Partition 1 is active.
DS30010089C-page 65
PIC24FJ256GA412/GB412 FAMILY
FIGURE 4-4:
RELATIONSHIP BETWEEN PARTITIONS 1 AND 2 AND ACTIVE/INACTIVE
PARTITIONS
000000h
000000h
000000h
Partition 1
Partition 2
Partition 1
BSEQx = 10
BSEQx = 15
BSEQx = 10
Active Partition
Reset
BOOTSWP Instruction
400000h
400000h
400000h
Partition 2
Partition 1
Partition 2
BSEQx = 15
BSEQx = 10
BSEQx = 15
Inactive Partition
000000h
000000h
000000h
Partition 1
Partition 1
Partition 2
BSEQx = 10
BSEQx = 10
BSEQx = 5
Active Partition
Reprogram BSEQx bits
Reset
400000h
400000h
400000h
Partition 2
Partition 2
Partition 1
BSEQx = 15
BSEQx = 5
BSEQx = 10
Inactive Partition
DS30010089C-page 66
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
4.1.4
FLASH CONFIGURATION WORDS
In PIC24FJ256GA412/GB412 family devices, the top
nine words of on-chip program memory are reserved for
configuration information. On device Reset, the configuration information is copied into the actual Configuration
registers, located in configuration space.
The address range of the Flash Configuration Words for
devices in the PIC24FJ256GA412/GB412 family are
shown in Table 4-2. Their location in the memory map is
shown with the other memory vectors in Figure 4-1.
Additional details on the device Configuration Words are
provided in Section 33.0 “Special Features”.
4.1.4.1
Dual Partition Configuration Words
In Dual Partition Flash modes, each partition has its
own set of Flash Configuration Words. The full set of
Configuration registers in the Active Partition is used to
determine the device’s configuration; the Configuration
Words in the Inactive Partition are used to determine
the device’s configuration when that partition becomes
active. However, some of the Configuration registers in
the Inactive Partition (FSEC, FBSLIM and FSIGN) may
be used to determine how the Active Partition is able or
allowed to access the Inactive Partition.
TABLE 4-2:
4.1.5
ONE-TIME-PROGRAMMABLE (OTP)
MEMORY
PIC24FJ256GA412/GB412 family devices provide
384 bytes of One-Time-Programmable (OTP) memory,
located at addresses, 801380h through 8013FEh.
This memory can be used for persistent storage of
application-specific information that will not be erased
by reprogramming the device. This includes many
types of information, such as (but not limited to):
•
•
•
•
•
•
Application checksums
Code revision information
Product information
Serial numbers
System manufacturing dates
Manufacturing lot numbers
OTP memory may be programmed in any mode,
including user RTSP mode, but it cannot be erased.
Data is not cleared by a Chip Erase. Once
programmed, it cannot be rewritten.
Do not perform repeated write operations on the OTP.
FLASH CONFIGURATION WORDS FOR PIC24FJ256GA412/GB412 FAMILY DEVICES
Program
Memory
(Words)
Single Partition
Dual Partition(1)
PIC24FJ64GA4XX/GB4XX
22,016
00AB80h:00ABB0h
005580h:0055FCh
PIC24FJ128GA4XX/GB4XX
44,032
015780h:0157B0h
00AB80h:00ABFCh
PIC24FJ256GA4XX/GB4XX
88,065
02AF80h:02AFB0h
015780h:0157FCh
Device Family
Note 1:
Configuration Word Address Range
Addresses for the Active Partition are shown. For the Inactive Partitions, add 400000h.
 2015 Microchip Technology Inc.
DS30010089C-page 67
PIC24FJ256GA412/GB412 FAMILY
4.2
Unique Device Identifier (UDID)
All (16-bit devices) family devices are individually
encoded during final manufacturing with a Unique
Device Identifier or UDID. This feature allows for manufacturing traceability of Microchip Technology devices
in applications where this is a requirement. It may also
be used by the application manufacturer for any
number of things that may require unique identification,
such as:
The UDID comprises five 24-bit program words. When
taken together, these fields form a unique 120-bit
identifier.
The UDID is stored in five read-only locations, located
between 801308h and 80130Eh in the device configuration space. Table 4-3 lists the addresses of the
identifier words and shows their contents.
• Tracking the device
• Unique serial number
• Unique security key
TABLE 4-3:
UDID ADDRESSES
Name
Address
UDID1
801308
Bits 23-16
Bits 15-8
Bits 7-0
UDID Word 1
UDID2
80130A
UDID Word 2
UDID3
80130C
UDID Word 3
UDID4
80130E
UDID Word 4
DS30010089C-page 68
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
4.3
Data Memory Space
Note:
This data sheet summarizes the features of
this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to
the “dsPIC33/PIC24 Family Reference
Manual”, “Data Memory with Extended
Data Space (EDS)” (DS39733). The information in this data sheet supersedes the
information in the FRM.
The PIC24F core has a 16-bit wide data memory space,
addressable as a single linear range. The Data Space
(DS) is accessed using two Address Generation Units
(AGUs), one each for read and write operations. The
Data Space memory map is shown in Figure 4-5.
The 16-bit wide data addresses in the data memory
space point to bytes within the Data Space. This gives a
DS address range of 64 Kbytes or 32K words. The lower
half (0000h to 7FFFh) is used for implemented (on-chip)
memory addresses.
FIGURE 4-5:
The upper half of data memory address space (8000h to
FFFFh) is used as a window into the Extended Data
Space (EDS). This allows the microcontroller to directly
access a greater range of data beyond the standard
16-bit address range. EDS is discussed in detail in
Section 4.3.5 “Extended Data Space (EDS)”.
Devices with 64 Kbytes of program memory implement
8 Kbytes of data RAM in the lower half of the DS, from
0800h to 27FFh. All other devices in this family implement 16 Kbytes of data RAM, from 0800h to 47FFh. The
lower half of the DS is compatible with previous PIC24F
microcontrollers without EDS.
4.3.1
DATA SPACE WIDTH
The data memory space is organized in
byte-addressable, 16-bit wide blocks. Data is aligned
in data memory and registers as 16-bit words, but all
Data Space Effective Addresses (EAs) resolve to
bytes. The Least Significant Bytes (LSBs) of each word
have even addresses, while the Most Significant Bytes
(MSBs) have odd addresses.
DATA SPACE MEMORY MAP FOR PIC24FJ256GA412/GB412 FAMILY DEVICES
MSB
Address
0001h
07FFh
0801h
1FFFh
2001h
Lower 32 Kbytes
Data Space
MSB
LSB
SFR Space
Data RAM
xxFFh
xx01h
LSB
Address
0000h
07FEh
0800h
SFR
Space
Near
Data Space
1FFEh
2000h
xxFEh
xx00h
Program Memory
Unimplemented
Data RAM (Kbyte)
7FFFh
8001h
7FFEh
8000h
128-Kbyte
256-Kbyte
8
16
27FFh
47FFh
EDS Window
(Section 4.3.5)
Upper 32 Kbytes
Data Space
FFFFh
Note:
Upper Boundary
64-Kbyte
FFFEh
Memory areas are not shown to scale.
 2015 Microchip Technology Inc.
DS30010089C-page 69
PIC24FJ256GA412/GB412 FAMILY
4.3.2
DATA MEMORY ORGANIZATION
AND ALIGNMENT
A Sign-Extend (SE) instruction is provided to allow
users to translate 8-bit signed data to 16-bit signed
values. Alternatively, for 16-bit unsigned data, users
can clear the MSB of any W register by executing a
Zero-Extend (ZE) instruction on the appropriate
address.
To maintain backward compatibility with PIC® MCUs and
improve Data Space memory usage efficiency, the
PIC24F instruction set supports both word and byte
operations. As a consequence of byte accessibility, all
EA calculations are internally scaled to step through
word-aligned memory. For example, the core recognizes
that Post-Modified Register Indirect Addressing mode
[Ws++] will result in a value of Ws + 1 for byte operations
and Ws + 2 for word operations.
Although most instructions are capable of operating on
word or byte data sizes, it should be noted that some
instructions operate only on words.
4.3.3
The 8-Kbyte area between 0000h and 1FFFh is
referred to as the Near Data Space. Locations in this
space are directly addressable via a 13-bit absolute
address field within all memory direct instructions. The
remainder of the Data Space is addressable indirectly.
Additionally, the whole Data Space is addressable
using MOV instructions, which support Memory Direct
Addressing with a 16-bit address field.
Data byte reads will read the complete word, which
contains the byte, using the LSB of any EA to determine which byte to select. The selected byte is placed
onto the LSB of the data path. That is, data memory
and registers are organized as two parallel, byte-wide
entities with shared (word) address decode, but
separate write lines. Data byte writes only write to the
corresponding side of the array or register which
matches the byte address.
4.3.4
All word accesses must be aligned to an even address.
Misaligned word data fetches are not supported, so
care must be taken when mixing byte and word
operations or translating from 8-bit MCU code. If a
misaligned read or write is attempted, an address error
trap will be generated. If the error occurred on a read,
the instruction underway is completed; if it occurred on
a write, the instruction will be executed but the write will
not occur. In either case, a trap is then executed, allowing the system and/or user to examine the machine
state prior to execution of the address Fault.
SPECIAL FUNCTION REGISTER
(SFR) SPACE
The first 2 Kbytes of the Near Data Space, from 0000h
to 07FFh, are primarily occupied with Special Function
Registers (SFRs). These are used by the PIC24F core
and peripheral modules for controlling the operation of
the device.
SFRs are distributed among the modules that they
control and are generally grouped together by module. A
diagram of the SFR space, showing where the SFRs are
actually implemented, is shown in Table 4-4. Each implemented area indicates a 32-byte region where at least
one address is implemented as an SFR. A complete list
of implemented SFRs, including their addresses, is
shown in Tables 4-5 through 4-12.
All byte loads into any W register are loaded into the
LSB. The Most Significant Byte (MSB) is not modified.
TABLE 4-4:
NEAR DATA SPACE
IMPLEMENTED REGIONS OF SFR DATA SPACE
SFR Space Address
xx00
000h
100h
xx20
xx40
xx60
Core
System
200h
xx80
xxA0
—
(1)
EPMP
Capture
CRC
Timers
DMA
Crypto Engine
600h
LCD
—
700h
I/O
CTM
I2C
CLC
—
RTCC
CMP/DAC
UART
SPI
500h
—
MCCP
SCCP
400h
xxE0
Interrupts
PMD
Compare
300h
xxC0
UART/SPI
DMA
USB(2)
LCD
I/O
A/D
NVM
—
PPS
—
Legend: — = Block is largely or entirely unimplemented.
Note 1: This region includes system control registers (Reference Oscillator).
2: Implemented in PIC24FJXXXGBXXX devices only.
DS30010089C-page 70
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
TABLE 4-5:
Register
SFR BLOCK 000h
Address
All Resets
Register
Address
All Resets
WREG0
000
0000000000000000
INTCON1
080
0000000000000000
IPC6
0B4
0100010001000100
IPC7
0B6
WREG1
002
0000000000000000
INTCON2
082
0100010001000100
1000000000000000
IPC8
0B8
WREG2
004
0000000000000000
INTCON3
0100010001000100
084
0000000000000000
IPC9
0BA
WREG3
006
0000000000000000
0100010001000100
INTCON4
086
0000000000000000
IPC10
0BC
WREG4
008
0100010001000100
0000000000000000
IFS0
088
0000000000000000
IPC11
0BE
WREG5
0100010001000100
00A
0000000000000000
IFS1
08A
0000000000000000
IPC12
0C0
0100010001000100
WREG6
00C
0000000000000000
IFS2
08C
0000000000000000
IPC13
0C2
0100010001000000
WREG7
00E
0000000000000000
IFS3
08E
0000000000000000
IPC14
0C4
0100010001000100
WREG8
010
0000000000000000
IFS4
090
0000000000000000
IPC15
0C6
0100010001000100
WREG9
012
0000000000000000
IFS5
092
0000000000000000
IPC16
0C8
0100010001000100
WREG10
014
0000000000000000
IFS6
094
0000000000000000
IPC17
0CA
0100010000000000
WREG11
016
0000000000000000
IFS7
096
0000000000000000
IPC18
0CC
0000000001000100
WREG12
018
0000000000000000
IEC0
098
0000000000000000
IPC19
0CE
0000010001000000
WREG13
01A
0000000000000000
IEC1
09A
0000000000000000
IPC20
0D0
0100010001000000
WREG14
01C
0000000000000000
IEC2
09C
0000000000000000
IPC21
0D2
0100010001000100
WREG15
01E
0000000000000000
IEC3
09E
0000000000000000
IPC22
0D4
0100010001000100
SPLIM
020
xxxxxxxxxxxxxxx0
IEC4
0A0
0000000000000000
IPC23
0D6
0100010001000100
PCL
02E
0000000000000000
IEC5
0A2
0000000000000000
IPC24
0D8
0100010001000100
PCH
030
0000000000000000
IEC6
0A4
0000000000000000
IPC25
0DA
0000010001000100
DSRPAG
032
0000000000000000
IEC7
0A6
0000000000000000
IPC26
0DC
0000010000000000
DSWPAG
034
0000000000000000
IPC0
0A8
0100010001000100
IPC27
0DE
0100010001000000
RCOUNT
036
xxxxxxxxxxxxxxxx
IPC1
0AA
0100010001000100
IPC28
0E0
0100010001000100
SR
042
0000000000000000
IPC2
0AC
0100010001000100
IPC29
0E2
0000000001000100
CORCON
044
0000000000000100
IPC3
0AE
0100010001000100
INTTREG
0E4
0000000000000000
DISICNT
052
00xxxxxxxxxxxxxx
IPC4
0B0
0100010001000100
TBLPAG
054
0000000000000000
IPC5
0B2
0100010000000100
Core
Register
Address
All Resets
Interrupt Controller
Legend: x = unknown or indeterminate value. Reset and address values are in hexadecimal.
 2015 Microchip Technology Inc.
DS30010089C-page 71
PIC24FJ256GA412/GB412 FAMILY
TABLE 4-6:
Register
SFR BLOCK 100h
Address
All Resets
Register
Clock/System Control
Address
All Resets
Register
Address
All Resets
CRCDATL
160
xxxxxxxxxxxxxxxx
T4CON
1AE
000000xx00000000
CRCDATH
162
xxxxxxxxxxxxxxxx
T5CON
1B0
000000xx00000000
OSCCON
100
0qqq0qqq00q00000(1)
CLKDIV
102
0000000100q00000
CRCWDATL
164
xxxxxxxxxxxxxxxx CTMU
CLKDIV2
104
0000000000000000
CRCWDATH
166
xxxxxxxxxxxxxxxx
CTMUCON1L
1C0
0000000000000000
OSCTUN
106
0000000000000000
REFOCONL
168
0000000000000000 CTMUCON1H
1C2
0000000000000000
RCON
10C
0010000000000011(2) REFOCONH
16A
0000000000000000
CTMUCON2L
1C4
0000000000000000
RCON2
10E
000000000000xxxx(2) REFOTRIML
16Ch
0000000000000000 CTMUCON2H
1C6
0000000000000000
HLVDCON
110
0000000000000000
DSCON
112
000xx00000000000(2) Peripheral Module Disable
RTCCON1L
1CC
0000000000000000
DSWAKE
114
0000000000000000(2)
PMD1
178
0000000000000000
RTCCON1H
1CE
0000000000000000
DSGPRO
116
0000000000000000(2)
PMD2
17A
0000000000000000
RTCCON2L
1D0
1000000000000000
DSGPR1
118
0000000000000000(2)
PMD3
17C
0000000000000000
RTCCON2H
1D2
0011111111111111
PMD4
17E
0000000000000000
RTCCON3L
1D4
0000000000000000
Parallel Master Port
REFOTRIMH
16E
0000000000000000 RTCC
PMCON1
128
0000000000000000
PMD5
180
0000000000000000
RTCCON3H
1D6
0000000000000000
PMCON2
12A
0000000000000000
PMD6
182
0000000000000000
RTCSTATL
1D8
0000000000000000
PMCON3
12C
0000000000000000
PMD7
184
0000000000000000
RTCSTATH
1DA
0000000000000000
PMCON4
12E
0000000000000000
PMD8
186
0000000000000000
TIMEL
1DC
0000000000000000
PMCS1CF
130
0000000000000000
TIMEH
1DE
0000000000000000
PMCS1BS
132
0000000000000000
TMR1
190
0000000000000000
DATEL
1E0
0000000100000110
PMCS1MD
134
0000000000000000
PR1
192
1111111111111111
DATEH
1E2
0000000000000001
PMCS2CF
136
0000000000000000
T1CON
194
0000000000000000
ALMTIMEL
1E4
0000000000000000
PMCS2BS
138
0000000000000000
TMR2
196
0000000000000000
ALMTIMEH
1E6
0000000000000000
PMCS2MD
13A
0000000000000000
TMR3HLD
198
0000000000000000
ALMDATEL
1E8
0000000100000110
PMDOUT1
13C
xxxxxxxxxxxxxxxx
TMR3
19A
0000000000000000
ALMDATEH
1EA
0000000000000001
PMDOUT2
13E
xxxxxxxxxxxxxxxx
PR2
19C
1111111111111111
TSATIMEL
1EC
0000000000000000
PMDIN1
140
xxxxxxxxxxxxxxxx
PR3
19E
1111111111111111
TSATIMEH
1EE
0000000000000000
PMDIN2
142
xxxxxxxxxxxxxxxx
T2CON
1A0
000000xx00000000
TSADATEL
1F0
0000000000000000
PMSTAT
144
0000000010001111
T3CON
1A2
000000xx00000000
TSADATEH
1F2
0000000000000000
TMR4
1A4
0000000000000000
TSBTIMEL
1F4
0000000000000000
CRC Generator/REFO
Timer
CRCCON1
158
0000000001x00000
TMR5HLD
1A6
0000000000000000
TSBTIMEH
1F6
0000000000000000
CRCCON2
15A
0000000000000000
TMR5
1A8
0000000000000000
TSBDATEL
1F8
0000000000000000
CRCXORL
15C
0000000000000000
PR4
1AA
1111111111111111
TSBDATEH
1FA
0000000000000000
CRCXORH
15E
0000000000000000
PR5
1AC
1111111111111111
Legend: x = unknown or indeterminate value. Reset and address values are in hexadecimal.
Note 1: The Reset value of the OSCCON register is dependent on both the type of Reset event and the device configuration. See Section 9.0
“Oscillator Configuration” for more information.
2: The Reset value of these registers is dependent on the type of Reset event. See Section 7.0 “Resets” for more information.
DS30010089C-page 72
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
TABLE 4-7:
Register
SFR BLOCK 200h
Address
All Resets
Register
Address
All Resets
Register
Address
All Resets
OC4CON2
250
0000000000001100
CCP2TMRH
2A2
0000000000000000
IC1CON1
200
0000000000000000
OC4RS
252
xxxxxxxxxxxxxxxx
CCP2PRL
2A4
1111111111111111
IC1CON2
202
0000000000001101
OC4R
254
xxxxxxxxxxxxxxxx
CCP2PRH
2A6
1111111111111111
IC1BUF
204
0000000000000000
OC4TMR
256
xxxxxxxxxxxxxxxx
CCP2RAL
2A8
0000000000000000
IC1TMR
206
0000000000000000
OC5CON1
258
0000000000000000
CCP2RAH
2AA
0000000000000000
IC2CON1
208
0000000000000000
OC5CON2
25A
0000000000001100
CCP2RBL
2AC
0000000000000000
IC2CON2
20A
0000000000001101
OC5RS
25C
xxxxxxxxxxxxxxxx
CCP2RBH
2AE
0000000000000000
IC2BUF
20C
0000000000000000
OC5R
25E
xxxxxxxxxxxxxxxx
CCP2BUFL
2B0
0000000000000000
IC2TMR
20E
0000000000000000
OC5TMR
260
xxxxxxxxxxxxxxxx
CCP2BUFH
2B2
0000000000000000
IC3CON1
210
0000000000000000
OC6CON1
262
0000000000000000
CCP3CON1L
2B4
0000000000000000
IC3CON2
212
0000000000001101
OC6CON2
264
0000000000001100
CCP3CON1H
2B6
0000000000000000
IC3BUF
214
0000000000000000
OC6RS
266
xxxxxxxxxxxxxxxx
CCP3CON2L
2B8
0000000000000000
IC3TMR
216
0000000000000000
OC6R
268
xxxxxxxxxxxxxxxx
CCP3CON2H
2BA
0000000100000000
IC4CON1
218
0000000000000000
OC6TMR
26A
xxxxxxxxxxxxxxxx
CCP3CON3L
2BC
0000000000000000
IC4CON2
21A
0000000000001101 CCP/Timer (MCCP)
CCP3CON3H
2BE
0000000000000000
IC4BUF
21C
0000000000000000
CCP1CON1L
26C
0000000000000000
CCP3STATL
2C0
0000000000xx0000
IC4TMR
21E
0000000000000000 CCP1CON1H
26E
0000000000000000
CCP3STATH
2C2
0000000000000000
IC5CON1
220
0000000000000000
CCP1CON2L
270
0000000000000000
CCP3TMRL
2C4
0000000000000000
IC5CON2
222
0000000000001101
CCP1CON2H
272
0000000100000000
CCP3TMRH
2C6
0000000000000000
IC5BUF
224
0000000000000000
CCP1CON3L
274
0000000000000000
CCP3PRL
2C8
1111111111111111
IC5TMR
226
0000000000000000 CCP1CON3H
276
0000000000000000
CCP3PRH
2CA
1111111111111111
IC6CON1
228
0000000000000000
CCP1STATL
278
0000000000xx0000
CCP3RAL
2CC
0000000000000000
IC6CON2
22A
0000000000001101
CCP1STATH
27A
0000000000000000
CCP3RAH
2CE
0000000000000000
IC6BUF
22C
0000000000000000
CCP1TMRL
27C
0000000000000000
CCP3RBL
2D0
0000000000000000
IC6TMR
22E
0000000000000000
CCP1TMRH
27E
0000000000000000
CCP3RBH
2D2
0000000000000000
CCP1PRL
280
1111111111111111
CCP3BUFL
2D4
0000000000000000
CCP3BUFH
2D6
0000000000000000
Input Capture
Output Compare/PWM
OC1CON1
230
0000000000000000
CCP1PRH
282
1111111111111111
OC1CON2
232
0000000000001100
CCP1RAL
284
0000000000000000
OC1RS
234
xxxxxxxxxxxxxxxx
CCP1RAH
286
0000000000000000
CMSTAT
2E6
0000000000000000
OC1R
236
xxxxxxxxxxxxxxxx
CCP1RBL
288
0000000000000000
CVRCON
2E8
0000000000000000
OC1TMR
238
xxxxxxxxxxxxxxxx
CCP1RBH
28A
0000000000000000
CM1CON
2EA
0000000000000000
OC2CON1
23A
0000000000000000
CCP1BUFL
28C
0000000000000000
CM2CON
2EC
0000000000000000
OC2CON2
23C
0000000000001100
CCP1BUFH
28E
0000000000000000
CM3CON
2EE
0000000000000000
OC2RS
23E
xxxxxxxxxxxxxxxx
CCP2CON1L
290
0000000000000000
ANCFG
2F4
0000000000000000
OC2R
240
xxxxxxxxxxxxxxxx CCP2CON1H
292
0000000000000000
DAC1CON
2F8
0000000000000000
OC2TMR
242
xxxxxxxxxxxxxxxx
CCP2CON2L
294
0000000000000000
DAC1DAT
2FA
0000000000000000
OC3CON1
244
0000000000000000
CCP2CON2H
296
0000000100000000
OC3CON2
246
0000000000001100
CCP2CON3L
298
0000000000000000
OC3RS
248
xxxxxxxxxxxxxxxx CCP2CON3H
29A
0000000000000000
OC3R
24A
xxxxxxxxxxxxxxxx
CCP2STATL
29C
0000000000xx0000
OC3TMR
2AC
xxxxxxxxxxxxxxxx
CCP2STATH
29E
0000000000000000
OC4CON1
24E
0000000000000000
CCP2TMRL
2A0
0000000000000000
Comparator/DAC/Analog Pin Control
Legend: x = unknown or indeterminate value. Reset and address values are in hexadecimal.
 2015 Microchip Technology Inc.
DS30010089C-page 73
PIC24FJ256GA412/GB412 FAMILY
TABLE 4-8:
Register
SFR BLOCK 300h
Address
All Resets
Register
Address
All Resets
Register
Address
All Resets
CCP6TMRH
35A
0000000000000000
U2SCINT
3BC
0000000000000000
CCP4CON1L
300
0000000000000000
CCP6PRL
35C
1111111111111111
U2GTC
3BE
0000000000000000
CCP4CON1H
302
0000000000000000
CCP6PRH
35E
1111111111111111
U2WTCH
3C0
0000000000000000
CCP4CON2L
304
0000000000000000
CCP6RAL
360
0000000000000000
U2WTCL
3C2
0000000000000000
CCP4CON2H
306
0000000100000000
CCP6RAH
362
0000000000000000
U3MODE
3C4
0000000000000000
CCP4CON3L
308
0000000000000000
CCP6RBL
364
0000000000000000
U3STA
3C6
0000000100010000
CCP4CON3H
30A
0000000000000000
CCP6RBH
366
0000000000000000
U3TXREG
3C8
x000000xxxxxxxxx
CCP4STATL
30C
0000000000xx0000
CCP6BUFL
368
0000000000000000
U3RXREG
3CA
0000000000000000
CCP4STATH
30E
0000000000000000
CCP6BUFH
36A
0000000000000000
U3BRG
3CC
0000000000000000
CCP4TMRL
310
0000000000000000 CCP7CON1L
36C
0000000000000000
U3ADMD
3CE
0000000000000000
CCP4TMRH
312
0000000000000000 CCP7CON1H
36E
0000000000000000
U4MODE
3D0
0000000000000000
CCP4PRL
314
1111111111111111 CCP7CON2L
370
0000000000000000
U4STA
3D2
0000000100010000
CCP4PRH
316
1111111111111111 CCP7CON2H
372
0000000100000000
U4TXREG
3D4
x000000xxxxxxxxx
CCP4RAL
318
0000000000000000 CCP7CON3L
374
0000000000000000
U4RXREG
3D6
0000000000000000
CCP4RAH
31A
0000000000000000 CCP7CON3H
376
0000000000000000
U4BRG
3D8
0000000000000000
CCP4RBL
31C
0000000000000000
CCP7STATL
378
0000000000xx0000
U4ADMD
3DA
0000000000000000
CCP4RBH
31E
0000000000000000
CCP7STATH
37A
0000000000000000
U5MODE
3DC
0000000000000000
CCP4BUFL
320
0000000000000000
CCP7TMRL
37C
0000000000000000
U5STA
3DE
0000000100010000
CCP4BUFH
322
0000000000000000
CCP7TMRH
37E
0000000000000000
U5TXREG
3E0
x000000xxxxxxxxx
CCP5CON1L
324
0000000000000000
CCP7PRL
380
1111111111111111
U5RXREG
3E2
0000000000000000
CCP5CON1H
326
0000000000000000
CCP7PRH
382
1111111111111111
U5BRG
3E4
0000000000000000
CCP5CON2L
328
0000000000000000
CCP7RAL
384
0000000000000000
U5ADMD
3E6
0000000000000000
CCP5CON2H
32A
0000000100000000
CCP7RAH
386
0000000000000000
U6MODE
3E8
0000000000000000
CCP5CON3L
32C
0000000000000000
CCP7RBL
388
0000000000000000
U6STAL
3EA
0000000100010000
CCP5CON3H
32E
0000000000000000
CCP7RBH
38A
0000000000000000
U6TXREG
3EC
x000000xxxxxxxxx
CCP5STATL
330
0000000000xx0000
CCP7BUFL
38C
0000000000000000
U6RXREG
3EE
0000000000000000
CCP5STATH
332
0000000000000000
CCP7BUFH
38E
0000000000000000
U6BRG
3F0
0000000000000000
CCP5TMRL
334
0000000000000000 UART
U6ADMD
3F2
0000000000000000
CCP5TMRH
336
0000000000000000
CCP/Timer (SCCP)
U1MODE
398
0000000000000000 SPI
CCP5PRL
338
1111111111111111
U1STA
39A
0000000100010000
SPI1CON1L
3F4
0000000000000000
CCP5PRH
33A
1111111111111111
U1TXREG
39C
x000000xxxxxxxxx
SPI1CON1H
3F6
0000000000000000
CCP5RAL
33C
0000000000000000
U1RXREG
39E
0000000000000000
SPI1CON2L
3F8
0000000000000000
CCP5RAH
33E
0000000000000000
U1BRG
3A0
0000000000000000
SPI1CON2H
3FA
0000000000000000
CCP5RBL
340
0000000000000000
U1ADMD
3A2
0000000000000000
SPI1STATL
3FC
0000000000101000
CCP5RBH
342
0000000000000000
U1SCCON
3A4
0000000000000000
SPI1STATH
3FE
0000000000000000
CCP5BUFL
344
0000000000000000
U1SCINT
3A6
0000000000000000
CCP5BUFH
346
0000000000000000
U1GTC
3A8
0000000000000000
CCP6CON1L
348
0000000000000000
U1WTCH
3AA
0000000000000000
CCP6CON1H
34A
0000000000000000
U1WTCL
3AC
0000000000000000
CCP6CON2L
34C
0000000000000000
U2MODE
3AE
0000000000000000
CCP6CON2H
34E
0000000100000000
U2STA
3B0
0000000100010000
CCP6CON3L
350
0000000000000000
U2TXREG
3B2
x000000xxxxxxxxx
CCP6CON3H
352
0000000000000000
U2RXREG
3B4
0000000000000000
CCP6STATL
354
0000000000xx0000
U2BRG
3B6
0000000000000000
CCP6STATH
356
0000000000000000
U2ADMD
3B8
0000000000000000
CCP6TMRL
358
0000000000000000
U2SCCON
3BA
0000000000000000
Legend: x = unknown or indeterminate value. Reset and address values are in hexadecimal.
DS30010089C-page 74
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
TABLE 4-9:
Register
SFR BLOCK 400h
Address
All Resets
Register
Address
All Resets
Register
Address
All Resets
SPI4BRGH
45A
0000000000000000
I2C2MSK
4B2
0000000000000000
SPI1BUFL
400
0000000000000000
SPI4IMSKL
45C
0000000000000000
I2C3RCV
4B4
0000000000000000
SPI1BUFH
402
0000000000000000
SPI4IMSKH
45E
0000000000000000
I2C3TRN
4B6
0000000011111111
SPI1BRGL
404
000xxxxxxxxxxxxx
SPI4URDTL
460
0000000000000000
I2C3BRG
4B8
0000000000000000
SPI1BRGH
406
0000000000000000
SPI4URDTH
462
0000000000000000
I2C3CONL
4BA
0001000000000000
SPI1IMSKL
408
0000000000000000 CLC
I2C3CONH
4BC
0000000000000000
SPI1IMSKH
40A
0000000000000000
CLC1CONL
464
0000000000000000
I2C3STAT
4BE
0000000000000000
SPI1URDTL
40C
0000000000000000
CLC1CONH
466
0000000000000000
I2C3ADD
4C0
0000000000000000
SPI1URDTH
40E
0000000000000000
CLC1SELL
468
0000000000000000
I2C3MSK
4C2
0000000000000000
SPI2CON1L
410
0000000000000000
CLC1SELH
46A
0000000000000000 DMA
SPI2CON1H
412
0000000000000000
CLC1GLSL
46C
0000000000000000
DMACON
4C4
0000000000000000
SPI2CON2L
414
0000000000000000
CLC1GLSH
46E
0000000000000000
DMABUF
4C6
0000000000000000
SPI2CON2H
416
0000000000000000
CLC2CONL
470
0000000000000000
DMAL
4C8
0000000000000000
SPI2STATL
418
0000000000101000
CLC2CONH
472
0000000000000000
DMAH
4CA
0000000000000000
SPI2STATH
41A
0000000000000000
CLC2SELL
474
0000000000000000
DMACH0
4CC
0000000000000000
SPI2BUFL
41C
0000000000000000
CLC2SELH
476
0000000000000000
DMAINT0
4CE
0000000000000000
SPI2BUFH
41E
0000000000000000
CLC2GLSL
478
0000000000000000
DMASRC0
4D0
0000000000000000
SPI2BRGL
420
000xxxxxxxxxxxxx
CLC2GLSH
47A
0000000000000000
DMADST0
4D2
0000000000000000
SPI2BRGH
422
0000000000000000
CLC3CONL
47C
0101001100011000
DMACNT0
4D4
0000000000000001
SPI2IMSKL
424
0000000000000000
CLC3CONH
47E
0000000000000000
DMACH1
4D6
0000000000000000
SPI2IMSKH
426
0000000000000000
CLC3SELL
480
0000000000000000
DMAINT1
4D8
0000000000000000
SPI2URDTL
428
0000000000000000
CLC3SELH
482
0000000000000000
DMASRC1
4DA
0000000000000000
SPI2URDTH
42A
0000000000000000
CLC3GLSL
484
0000000000000000
DMADST1
4DC
0000000000000000
SPI3CON1L
42C
0000000000000000
CLC3GLSH
486
0000000000000000
DMACNT1
4DE
0000000000000001
SPI3CON1H
42E
0000000000000000
CLC4CONL
488
0000000000000000
DMACH2
4E0
0000000000000000
SPI3CON2L
430
0000000000000000
CLC4CONH
48A
0000000000000000
DMAINT2
4E2
0000000000000000
SPI3CON2H
432
0000000000000000
CLC4SELL
48C
0000000000000000
DMASRC2
4E4
0000000000000000
SPI3STATL
434
0000000000101000
CLC4SELH
48E
0000000000000000
DMADST2
4E6
0000000000000000
SPI3STATH
436
0000000000000000
CLC4GLSL
490
0000000000000000
DMACNT2
4E8
0000000000000001
SPI3BUFL
438
0000000000000000
CLC4GLSH
492
0000000000000000
DMACH3
4EA
0000000000000000
SPI3BUFH
43A
0000000000000000 I2C
DMAINT3
4EC
0000000000000000
SPI3BRGL
43C
000xxxxxxxxxxxxx
I2C1RCV
494
0000000000000000
DMASRC3
4EE
0000000000000000
SPI3BRGH
43E
0000000000000000
I2C1TRN
496
0000000011111111
DMADST3
4F0
0000000000000000
SPI3IMSKL
440
0000000000000000
I2C1BRG
498
0000000000000000
DMACNT3
4F2
0000000000000001
SPI3IMSKH
442
0000000000000000
I2C1CONL
49A
0001000000000000
DMACH4
4F4
0000000000000000
SPI3URDTL
444
0000000000000000
I2C1CONH
49C
0000000000000000
DMAINT4
4F6
0000000000000000
SPI3URDTH
446
0000000000000000
I2C1STAT
49E
0000000000000000
DMASRC4
4F8
0000000000000000
SPI4CON1L
448
0000000000000000
I2C1ADD
4A0
0000000000000000
DMADST4
4FA
0000000000000000
SPI4CON1H
44A
0000000000000000
I2C1MSK
4A2
0000000000000000
DMACNT4
4FC
0000000000000001
SPI4CON2L
44C
0000000000000000
I2C2RCV
4A4
0000000000000000
DMACH5
4FE
0000000000000000
SPI4CON2H
44E
0000000000000000
I2C2TRN
4A6
0000000011111111
SPI (Continued)
SPI4STATL
450
0000000000101000
I2C2BRG
4A8
0000000000000000
SPI4STATH
452
0000000000000000
I2C2CONL
4AA
0001000000000000
SPI4BUFL
454
0000000000000000
I2C2CONH
4AC
0000000000000000
SPI4BUFH
456
0000000000000000
I2C2STAT
4AE
0000000000000000
SPI4BRGL
458
000xxxxxxxxxxxxx
I2C2ADD
4B0
0000000000000000
Legend: x = unknown or indeterminate value. Reset and address values are in hexadecimal.
 2015 Microchip Technology Inc.
DS30010089C-page 75
PIC24FJ256GA412/GB412 FAMILY
TABLE 4-10:
Register
SFR BLOCK 500h
Address
All Resets
Register
Address
All Resets
Register
(1)
Address
All Resets
CRYTXTB6
564
xxxxxxxxxxxxxxxx
U1EP8
5B2
0000000000000000
DMAINT5
500
0000000000000000
CRYTXTB7
566
xxxxxxxxxxxxxxxx
U1EP9(1)
5B4
0000000000000000
DMASRC5
502
0000000000000000
CRYTXTC0
558
xxxxxxxxxxxxxxxx
U1EP10(1)
5B6
0000000000000000
DMADST5
504
0000000000000000
CRYTXTC1
56A
xxxxxxxxxxxxxxxx
U1EP11(1)
5B8
0000000000000000
DMACNT5
506
0000000000000001
CRYTXTC2
56C
xxxxxxxxxxxxxxxx
U1EP12(1)
5BA
0000000000000000
CRYTXTC3
56E
xxxxxxxxxxxxxxxx
U1EP13(1)
5BC
0000000000000000
DMA (Continued)
Cryptographic Engine
CRYCONL
51C
x0xxxx0xxxxxxxxx
CRYTXTC4
570
xxxxxxxxxxxxxxxx
U1EP14(1)
5BE
0000000000000000
CRYCONH
51E
0xxxxxxxxxx0xxxx
CRYTXTC5
572
xxxxxxxxxxxxxxxx
U1EP15(1)
5C0
0000000000000000
CRYSTAT
520
00000000xxxx0xxx
CRYTXTC6
574
xxxxxxxxxxxxxxxx LCD Controller
CRYOTP
524
00000000xxxxxxxx
CRYTXTC7
576
xxxxxxxxxxxxxxxx
LCDCON
5C2
0000000000000000(2)
CRYKEY0
528
xxxxxxxxxxxxxxxx USB
LCDREF
5C4
0000000000000000(2)
CRYKEY1
CRYKEY2
CRYKEY3
CRYKEY4
CRYKEY5
CRYKEY6
CRYKEY7
CRYKEY8
CRYKEY9
CRYKEY10
CRYKEY11
CRYKEY12
CRYKEY13
CRYKEY14
CRYKEY15
CRYTXTA0
CRYTXTA1
CRYTXTA2
CRYTXTA3
CRYTXTA4
CRYTXTA5
CRYTXTA6
CRYTXTA7
CRYTXTB0
CRYTXTB1
CRYTXTB2
CRYTXTB3
CRYTXTB4
CRYTXTB5
52A
52C
52E
530
532
534
536
538
53A
53C
53E
540
542
544
546
548
54A
54C
54E
550
552
554
556
558
55A
55C
55E
560
562
xxxxxxxxxxxxxxxx
(1)
U1OTGIR
578
0000000000000000
LCDPS
5C6
0000000000000000(2)
xxxxxxxxxxxxxxxx
U1OTGIE(1)
57A
0000000000000000
LCDDATA0
5C8
0000000000000000(2)
xxxxxxxxxxxxxxxx
U1OTGSTAT(1)
57C
0000000000000000
LCDDATA1
5CA
0000000000000000(2)
(1)
57E
0000000000000000
LCDDATA2
5CC
0000000000000000(2)
xxxxxxxxxxxxxxxx U1OTGCON
xxxxxxxxxxxxxxxx
U1PWRC
580
00000000x0000000
LCDDATA3
5CE
0000000000000000(2)
xxxxxxxxxxxxxxxx
(1)
582
0000000000000000
LCDDATA4
5D0
0000000000000000(2)
(1)
xxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxx
(1)
U1IR
584
0000000000000000
LCDDATA5
5D2
0000000000000000(2)
(1)
586
0000000000000000
LCDDATA6
5D4
0000000000000000(2)
(1)
U1IE
U1EIR
588
0000000000000000
LCDDATA7
5D6
0000000000000000(2)
(1)
58A
0000000000000000
LCDDATA8
5D8
0000000000000000(2)
(1)
U1EIE
U1STAT
58C
00000000xx000000
LCDDATA9
5DA
0000000000000000(2)
(1)
58E
000000000xxxxxxx LCDDATA10
5DC
0000000000000000(2)
(1)
U1CON
U1ADDR
590
0000000000000000 LCDDATA11
5DE
0000000000000000(2)
(1)
592
0000000000000000 LCDDATA12
5E0
0000000000000000(2)
(1)
U1BDTP1
U1FRML
594
0000000000000000 LCDDATA13
5E2
0000000000000000(2)
(1)
596
0000000000000000 LCDDATA14
5E4
0000000000000000(2)
(1)
U1FRMH
U1TOK
U1SOF
598
0000000000000000 LCDDATA15
5E6
0000000000000000(2)
(1)
59A
0000000000000000 LCDDATA16
5E8
0000000000000000(2)
(1)
59C
0000000000000000 LCDDATA17
5EA
0000000000000000(2)
(1)
59E
0000000000000000 LCDDATA18
5EC
0000000000000000(2)
(1)
U1BDTP2
U1BDTP3
U1CNFG1
xxxxxxxxxxxxxxxx
U1CNFG2
5A0
0000000000000000 LCDDATA19
5EE
0000000000000000(2)
xxxxxxxxxxxxxxxx
U1EP0
(1)
5A2
0000000000000000 LCDDATA20
5F0
0000000000000000(2)
U1EP1
(1)
5A4
0000000000000000 LCDDATA21
5F2
0000000000000000(2)
U1EP2
(1)
5A6
0000000000000000 LCDDATA22
5F4
0000000000000000(2)
xxxxxxxxxxxxxxxx
U1EP3
(1)
5A8
0000000000000000 LCDDATA23
5F6
0000000000000000(2)
xxxxxxxxxxxxxxxx
U1EP4(1)
5AA
0000000000000000 LCDDATA24
5F8
0000000000000000(2)
xxxxxxxxxxxxxxxx
U1EP5(1)
5AC
0000000000000000 LCDDATA25
5FA
0000000000000000(2)
xxxxxxxxxxxxxxxx
U1EP6(1)
5AE
0000000000000000 LCDDATA26
5FC
0000000000000000(2)
xxxxxxxxxxxxxxxx
U1EP7(1)
5B0
0000000000000000 LCDDATA27
5FE
0000000000000000(2)
xxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxx
Legend: x = unknown or indeterminate value. Reset and address values are in hexadecimal.
Note 1: Implemented in PIC24FJXXXGB4XX devices only.
2: LCD registers are only reset on a device POR.
DS30010089C-page 76
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
TABLE 4-11:
Register
SFR BLOCK 600h
Address
All Resets
Register
Address
All Resets
Register
Address
All Resets
IOCPDB
684
0000000000000000
PORTF
6C4
0000000000000000
LCDDATA28
600
0000000000000000(1)
TRISC
686
1111000000011110
LATF
6C6
0000000000000000
LCDDATA29
602
0000000000000000(1)
PORTC
688
0000000000000000
ODCF
6C8
0000000000000000
LCDDATA30
604
0000000000000000(1)
LATC
68A
0000000000000000
ANSF
6CA
0011000100111111
LCDDATA31
606
0000000000000000(1)
ODCC
68C
0000000000000000
IOCPF
6CC
0000000000000000
LCDSE0
608
0000000000000000(1)
ANSC
68E
0000000000011110
IOCNF
6CE
0000000000000000
LCDSE1
60A
0000000000000000(1)
IOCPC
690
0000000000000000
IOCFF
6D0
0000000000000000
LCDSE2
60C
0000000000000000(1)
IOCNC
692
0000000000000000
IOCPUF
6D2
0000000000000000
LCDSE3
60E
0000000000000000(1)
IOCFC
694
0000000000000000
IOCPDF
6D4
0000000000000000
LCDREG
610
0000000000000000(1)
IOCPUC
696
0000000000000000
TRISG
6D6
1111001111001111
IOCPDC
698
0000000000000000
PORTG
6D8
0000000000000000
LCD Controller (Continued)
I/O
PADCON
65A
0000000000000000
TRISD
69A
1111111111111111
LATG
6DA
0000000000000000
IOCSTAT
65C
0000000000000000
PORTD
69C
0000000000000000
ODCG
6DC
0000000000000000
TRISA
65E
1100011011111111
LATD
69E
0000000000000000
ANSG
6DE
1111001111000011
PORTA
660
0000000000000000
ODCD
6A0
0000000000000000
IOCPG
6E0
0000000000000000
LATA
662
0000000000000000
ANSD
6A2
1111111111111111
IOCNG
6E2
0000000000000000
ODCA
664
0000000000000000
IOCPD
6A4
0000000000000000
IOCFG
6E4
0000000000000000
ANSA
666
1100011011101101
IOCND
6A6
0000000000000000
IOCPUG
6E6
0000000000000000
IOCPA
668
0000000000000000
IOCFD
6A8
0000000000000000
IOCPDG
6E8
0000000000000000
IOCNA
66A
0000000000000000
IOCPUD
6AA
0000000000000000
TRISH
6EA
1111111111111111
IOCFA
66C
0000000000000000
IOCPDD
6AC
0000000000000000
PORTH
6EC
0000000000000000
IOCPUA
66E
0000000000000000
TRISE
6AE
0000001111111111
LATH
6EE
0000000000000000
IOCPDA
670
0000000000000000
PORTE
6B0
0000000000000000
ODCH
6F0
0000000000000000
TRISB
672
1111111111111111
LATE
6B2
0000000000000000
ANSH
6F2
0000000000011111
PORTB
674
0000000000000000
ODCE
6B4
0000000000000000
IOCPH
6F4
0000000000000000
LATB
676
0000000000000000
ANSE
6B6
0000001111111111
IOCNH
6F6
0000000000000000
ODCB
678
0000000000000000
IOCPE
6B8
0000000000000000
IOCFH
6F8
0000000000000000
ANSB
67A
1111111111111111
IOCNE
6BA
0000000000000000
IOCPUH
6FA
0000000000000000
IOCPB
67C
0000000000000000
IOCFE
6BC
0000000000000000
IOCPDH
6FC
0000000000000000
IOCNB
67E
0000000000000000
IOCPUE
6BE
0000000000000000
TRISJ
6FE
0000000000000011
IOCFB
680
0000000000000000
IOCPDE
6C0
0000000000000000
IOCPUB
682
0000000000000000
TRISF
6C2
0011000111111111
Legend: x = unknown or indeterminate value. Reset and address values are in hexadecimal.
Note 1: LCD registers are only reset on a device POR.
 2015 Microchip Technology Inc.
DS30010089C-page 77
PIC24FJ256GA412/GB412 FAMILY
TABLE 4-12:
Register
SFR BLOCK 700h
Address
All Resets
Register
Address
All Resets
Register Address
All Resets
AD1CON1
746
0000000000000000
RPINR14
7AC
0011111100111111
PORTJ
700
0000000000000000
AD1CON2
748
0000000000000000
RPINR15
7AE
0011111100111111
LATJ
702
0000000000000000
AD1CON3
74A
0000000000000000
RPINR16
7B0
0011111100111111
ODCJ
704
0000000000000000
AD1CHS
74C
0000000000000000
RPINR17
7B2
0011111100111111
ANSJ
706
0000000000000000
AD1CSSH
74E
0000000000000000
RPINR18
7B4
0011111100111111
IOCPJ
708
0000000000000000
AD1CSSL
750
0000000000000000
RPINR19
7B6
0011111100111111
IOCNJ
70A
0000000000000000
AD1CON4
752
0000000000000000
RPINR20
7B8
0011111100111111
IOCFJ
70C
0000000000000000
AD1CON5
754
0000000000000000
RPINR21
7BA
0011111100111111
IOCPUJ
70E
0000000000000000
AD1CHITH
756
0000000000000000
RPINR22
7BC
0011111100111111
IOCPDJ
710
0000000000000000
AD1CHITL
758
0000000000000000
RPINR23
7BE
0011111100111111
ADC1CTMENH
75A
0000000000000000
RPINR24
7C0
0011111100111111
I/O (Continued)
A/D
AD1BUF0
712
xxxxxxxxxxxxxxxx
ADC1CTMENL
75C
0000000000000000
RPINR25
7C2
0011111100111111
AD1BUF1
714
xxxxxxxxxxxxxxxx
ADC1RESDMA
75E
0000000000000000
RPINR26
7C4
0011111100111111
AD1BUF2
716
xxxxxxxxxxxxxxxx NVM Controller
RPINR27
7C6
0011111100111111
AD1BUF3
718
xxxxxxxxxxxxxxxx
NVMCON
760
0000000000000000(1) RPINR28
7C8
0011111100111111
AD1BUF4
71A
xxxxxxxxxxxxxxxx
NVMADRL
762
0000000000000000
RPINR29
7CA
0011111100111111
AD1BUF5
71C
xxxxxxxxxxxxxxxx
NVMADRH
764
0000000000000000
RPINR30
7CC
0011111100111111
AD1BUF6
71E
xxxxxxxxxxxxxxxx
NVMKEY
766
0000000000000000
RPINR31
7CE
0011111100111111
AD1BUF7
720
xxxxxxxxxxxxxxxx
NVMSRCADRL
768
0000000000000000
RPOR0
7D4
0000000000000000
AD1BUF8
722
xxxxxxxxxxxxxxxx
NVMSRCADRH
76A
0000000000000000
RPOR1
7D6
0000000000000000
AD1BUF9
724
xxxxxxxxxxxxxxxx
JDATAL
77C
xxxxxxxxxxxxxxxx
RPOR2
7D8
0000000000000000
AD1BUF10
726
xxxxxxxxxxxxxxxx
JDATAH
77E
xxxxxxxxxxxxxxxx
RPOR3
7DA
0000000000000000
AD1BUF11
728
xxxxxxxxxxxxxxxx Peripheral Pin Select
RPOR4
7DC
0000000000000000
AD1BUF12
72A
xxxxxxxxxxxxxxxx
RPINR0
790
0011111100111111
RPOR5
7DE
0000000000000000
AD1BUF13
72C
xxxxxxxxxxxxxxxx
RPINR1
792
0011111100111111
RPOR6
7E0
0000000000000000
AD1BUF14
72E
xxxxxxxxxxxxxxxx
RPINR2
794
0011111100111111
RPOR7
7E2
0000000000000000
AD1BUF15
730
xxxxxxxxxxxxxxxx
RPINR3
796
0011111100111111
RPOR8
7E4
0000000000000000
AD1BUF16
732
xxxxxxxxxxxxxxxx
RPINR4
798
0011111100111111
RPOR9
7E6
0000000000000000
AD1BUF17
734
xxxxxxxxxxxxxxxx
RPINR5
79A
0011111100111111
RPOR10
7E8
0000000000000000
AD1BUF18
736
xxxxxxxxxxxxxxxx
RPINR6
79C
0011111100111111
RPOR11
7EA
0000000000000000
AD1BUF19
738
xxxxxxxxxxxxxxxx
RPINR7
7A2
0011111100111111
RPOR12
7EC
0000000000000000
AD1BUF20
73A
xxxxxxxxxxxxxxxx
RPINR8
7A0
0011111100111111
RPOR13
7EE
0000000000000000
AD1BUF21
73C
xxxxxxxxxxxxxxxx
RPINR9
7A2
0011111100111111
RPOR14
7F0
0000000000000000
AD1BUF22
73E
xxxxxxxxxxxxxxxx
RPINR10
7A4
0011111100111111
RPOR15
7F2
0000000000000000
AD1BUF23
740
xxxxxxxxxxxxxxxx
RPINR11
7A6
0011111100111111
AD1BUF24
742
xxxxxxxxxxxxxxxx
RPINR12
7A8
0011111100111111
AD1BUF25
744
xxxxxxxxxxxxxxxx
RPINR13
7AA
0011111100111111
Legend: x = unknown or indeterminate value. Reset and address values are in hexadecimal.
Note 1: The Reset value shown is for POR only. The value on other Reset states is dependent on the state of memory write/erase operations or
partition swap at the time of Reset.
DS30010089C-page 78
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
4.3.5
EXTENDED DATA SPACE (EDS)
The Extended Data Space (EDS) allows PIC24F
devices to address a much larger range of data than
would otherwise be possible with a 16-bit address range.
EDS includes any additional internal data memory not
directly accessible by the lower 32-Kbyte data address
space and any external memory through the Enhanced
Parallel Master Port (EPMP).
In addition, EDS also allows read access to the
program memory space. This feature is called Program
Space Visibility (PSV) and is discussed in detail in
Section 4.4.3 “Reading Data from Program Memory
Using EDS”.
Figure 4-6 displays the entire EDS space. The EDS is
organized as pages, called EDS pages, with one page
equal to the size of the EDS window (32 Kbytes). A particular EDS page is selected through the Data Space
Read Page register (DSRPAG) or Data Space Write
Page register (DSWPAG). For PSV, only the DSRPAG
register is used. The combination of the DSRPAG
register value and the 16-bit wide data address forms a
24-bit Effective Address (EA).
FIGURE 4-6:
Special
Function
Registers
The data addressing range of PIC24FJ256GA412/
GB412 family devices depends on the version of the
Enhanced Parallel Master Port (EPMP) implemented
on a particular device; this is, in turn, a function of the
device pin count. Table 4-13 lists the total memory
accessible by each of the devices in this family. For
more details on accessing external memory using
EPMP, refer to the “dsPIC33/PIC24 Family Reference
Manual”, “Enhanced Parallel Master Port (EPMP)”
(DS39730).
.
TABLE 4-13:
TOTAL ACCESSIBLE DATA
MEMORY
Internal
RAM
External RAM
Access Using
EPMP
PIC24FJXXXGX406
8 Kbytes
Up to 64 Kbytes
PIC24FJXXXGX410
16 Kbytes
Up to 16 Mbytes
PIC24FJXXXGX412
16 Kbytes
Up to 16 Mbytes
Family
Note:
Accessing Page 0 in the EDS window will
generate an address error trap as Page 0
is the base data memory (data locations,
0800h to 7FFFh, in the lower Data Space).
EXTENDED DATA SPACE
0000h
0800h
Internal
Data
Memory
Space
(up to
30 Kbytes)
EDS Pages
8000h
32-Kbyte
EDS
Window
FFFEh
008000h
FF8000h
000000h
7F8000h
000001h
7F8001h
External
Memory
Access
Using
EPMP(1)
External
Memory
Access
Using
EPMP(1)
Program
Space
Access
(Lower
Word)
Program
Space
Access
(Lower
Word)
Program
Space
Access
(Upper
Word)
Program
Space
Access
(Upper
Word)
00FFFEh
FFFFFEh
007FFEh
7FFFFEh
007FFFh
7FFFFFh
DSxPAG
= 001h
DSx PAG
= 1FFh
DSRPAG
= 200h
DSRPAG
= 2FFh
DSRPAG
= 300h
DSRPAG
= 3FFh
EPMP Memory Space(1)
Program Memory
Note 1: The range of addressable memory available is dependent on the device pin count and EPMP implementation.
 2015 Microchip Technology Inc.
DS30010089C-page 79
PIC24FJ256GA412/GB412 FAMILY
4.3.5.1
Data Read from EDS
In order to read the data from the EDS space, first, an
Address Pointer is set up by loading the required EDS
page number into the DSRPAG register and assigning
the offset address to one of the W registers. Once the
above assignment is done, the EDS window is enabled
by setting bit 15 of the Working register assigned with
the offset address; then, the contents of the pointed
EDS location can be read.
Example 4-1 shows how to read a byte, word and
double-word from EDS.
Note:
Figure 4-7 illustrates how the EDS space address is
generated for read operations.
All read operations from EDS space have
an overhead of one instruction cycle.
Therefore, a minimum of two instruction
cycles is required to complete an EDS
read. EDS reads under the REPEAT
instruction; the first two accesses take
three cycles and the subsequent
accesses take one cycle.
When the Most Significant bit (MSb) of EA is ‘1’ and
DSRPAG<9> = 0, the lower 9 bits of DSRPAG are concatenated to the lower 15 bits of the EA to form a 24-bit
EDS space address for read operations.
FIGURE 4-7:
EDS ADDRESS GENERATION FOR READ OPERATIONS
Select
9
8
Wn
1
0
DSRPAG Reg
15 Bits
9 Bits
24-Bit EA
0 = Extended SRAM and EPMP
Wn<0> is Byte Select
EXAMPLE 4-1:
EDS READ CODE IN ASSEMBLY
; Set the EDS page from where
mov
#0x0002, w0
mov
w0, DSRPAG
mov
#0x0800, w1
bset
w1, #15
the data to be read
;page 2 is selected for read
;select the location (0x800) to be read
;set the MSB of the base address, enable EDS mode
;Read a byte from the selected location
mov.b
[w1++], w2
;read Low byte
mov.b
[w1++], w3
;read High byte
;Read a word from the selected location
mov
[w1], w2
;
;Read Double - word from the selected location
mov.d
[w1], w2
;two word read, stored in w2 and w3
DS30010089C-page 80
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
4.3.5.2
Data Write into EDS
In order to write data to EDS space, such as in EDS
reads, an Address Pointer is set up by loading the
required EDS page number into the DSWPAG register
and assigning the offset address to one of the W registers. Once the above assignment is done, then the
EDS window is enabled by setting bit 15 of the Working
register assigned with the offset address and the
accessed location can be written.
While developing code in assembly, care must be taken
to update the DS Page registers when an Address
Pointer crosses the page boundary. The ‘C’ compiler
keeps track of the addressing, and increments or
decrements the DS Page registers accordingly, while
accessing contiguous data memory locations.
Note 1: All write operations to EDS are executed
in a single cycle.
2: Use of Read/Modify/Write operation on
any EDS location under a REPEAT
instruction is not supported. For example,
BCLR, BSW, BTG, RLC f, RLNC f, RRC f,
RRNC f, ADD f, SUB f, SUBR f, AND f,
IOR f, XOR f, ASR f, ASL f.
Figure 4-8 illustrates how the EDS space address is
generated for write operations.
When the MSb of EA is ‘1’, the lower 9 bits of DSWPAG
are concatenated to the lower 15 bits of EA to form a
24-bit EDS address for write operations. Example 4-2
shows how to write a byte, word and double-word to
EDS.
3: Use the DSRPAG register while
performing Read/Modify/Write operations.
The DS Page registers (DSRPAG/DSWPAG) do not
update automatically while crossing a page boundary
when the rollover happens from 0xFFFF to 0x8000.
FIGURE 4-8:
EDS ADDRESS GENERATION FOR WRITE OPERATIONS
Select
8
Wn
1
0
DSWPAG Reg
9 Bits
15 Bits
24-Bit EA
Wn<0> is Byte Select
EXAMPLE 4-2:
EDS WRITE CODE IN ASSEMBLY
; Set the EDS page where the data to be written
mov
#0x0002, w0
mov
w0, DSWPAG
;page 2 is selected for write
mov
#0x0800, w1
;select the location (0x800) to be written
bset
w1, #15
;set the MSB of the base address, enable EDS mode
;Write a byte to the selected location
mov
#0x00A5, w2
mov
#0x003C, w3
mov.b
w2, [w1++]
;write Low byte
mov.b
w3, [w1++]
;write High byte
;Write a word to the selected location
mov
#0x1234, w2
;
mov
w2, [w1]
;
;Write a Double - word to the selected location
mov
#0x1122, w2
mov
#0x4455, w3
mov.d
w2, [w1]
;2 EDS writes
 2015 Microchip Technology Inc.
DS30010089C-page 81
PIC24FJ256GA412/GB412 FAMILY
TABLE 4-14:
EDS MEMORY ADDRESS WITH DIFFERENT PAGES AND ADDRESSES
DSRPAG
(Data Space Read
Register)
DSWPAG
(Data Space Write
Register)
Source/Destination
Address While
Indirect
Addressing
x(1)
x(1)
0000h to 1FFFh
000000h to
001FFFh
2000h to 7FFFh
002000h to
007FFFh
001h
001h
008000h to
00FFFEh
002h
002h
010000h to
017FFEh
003h
•
•
•
•
•
1FFh
003h
•
•
•
•
•
1FFh
018000h to
0187FEh
•
•
•
•
FF8000h to
FFFFFEh
000h
000h
8000h to FFFFh
Near Data Space(2)
EPMP Memory Space
Address Error Trap(3)
If the source/destination address is below 8000h, the DSRPAG and DSWPAG registers are not considered.
This Data Space can also be accessed by Direct Addressing.
When the source/destination address is above 8000h and DSRPAG/DSWPAG are ‘0’, an address error
trap will occur.
SOFTWARE STACK
Apart from its use as a Working register, the W15
register in PIC24F devices is also used as a Software
Stack Pointer (SSP). The pointer always points to the
first available free word and grows from lower to higher
addresses. It predecrements for stack pops and postincrements for stack pushes, as shown in Figure 4-9.
Note that for a PC push during any CALL instruction,
the MSB of the PC is zero-extended before the push,
ensuring that the MSB is always clear.
Note:
Comment
Invalid Address
A PC push during exception processing
will concatenate the SRL register to the
MSB of the PC prior to the push.
The Stack Pointer Limit Value register (SPLIM), associated with the Stack Pointer, sets an upper address
boundary for the stack. SPLIM is uninitialized at Reset.
As is the case for the Stack Pointer, SPLIM<0> is
forced to ‘0’ as all stack operations must be
word-aligned. Whenever an EA is generated using
W15 as a source or destination pointer, the resulting
address is compared with the value in SPLIM. If the
contents of the Stack Pointer (W15) and the SPLIM register are equal, and a push operation is performed, a
stack error trap will not occur. The stack error trap will
occur on a subsequent push operation. Thus, for
DS30010089C-page 82
example, if it is desirable to cause a stack error trap
when the stack grows beyond address, 2000h in RAM,
initialize the SPLIM with the value, 1FFEh.
Similarly, a Stack Pointer underflow (stack error) trap is
generated when the Stack Pointer address is found to
be less than 0800h. This prevents the stack from
interfering with the SFR space.
A write to the SPLIM register should not be immediately
followed by an indirect read operation using W15.
FIGURE 4-9:
0000h
Stack Grows Towards
Higher Address
Note 1:
2:
3:
4.3.6
24-Bit EA
Pointing to EDS
CALL STACK FRAME
15
0
PC<15:0>
000000000 PC<22:16>
<Free Word>
W15 (before CALL)
W15 (after CALL)
POP : [--W15]
PUSH : [W15++]
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
4.4
Interfacing Program and Data
Memory Spaces
4.4.1
ADDRESSING PROGRAM SPACE
Since the address ranges for the data and program
spaces are 16 and 24 bits, respectively, a method is
needed to create a 23-bit or 24-bit program address
from 16-bit data registers. The solution depends on the
interface method to be used.
The PIC24F architecture uses a 24-bit wide program
space and 16-bit wide Data Space. The architecture is
also a modified Harvard scheme, meaning that data
can also be present in the program space. To use this
data successfully, it must be accessed in a way that
preserves the alignment of information in both spaces.
For table operations, the 8-bit Table Memory Page
Address (TBLPAG) register is used to define a 32K word
region within the program space. This is concatenated
with a 16-bit EA to arrive at a full 24-bit program space
address. In this format, the MSBs of TBLPAG are used
to determine if the operation occurs in the user memory
(TBLPAG<7> = 0) or the configuration memory
(TBLPAG<7> = 1).
Aside from normal execution, the PIC24F architecture
provides two methods by which program space can be
accessed during operation:
• Using table instructions to access individual bytes
or words anywhere in the program space
• Remapping a portion of the program space into
the Data Space (Program Space Visibility)
For remapping operations, the 10-bit Extended Data
Space Read (DSRPAG) register is used to define a
16K word page in the program space. When the Most
Significant bit (MSb) of the EA is ‘1’, and the MSb (bit 9)
of DSRPAG is ‘1’, the lower 8 bits of DSRPAG are concatenated with the lower 15 bits of the EA to form a
23-bit program space address. The DSRPAG<8> bit
decides whether the lower word (when the bit is ‘0’) or
the higher word (when the bit is ‘1’) of program memory
is mapped. Unlike table operations, this strictly limits
remapping operations to the user memory area.
Table instructions allow an application to read or write
to small areas of the program memory. This makes the
method ideal for accessing data tables that need to be
updated from time to time. It also allows access to all
bytes of the program word. The remapping method
allows an application to access a large block of data on
a read-only basis, which is ideal for look-ups from a
large table of static data. It can only access the least
significant word of the program word.
Table 4-15 and Figure 4-10 show how the program EA
is created for table operations, and remapping
accesses from the data EA. Here, P<23:0> refer to a
program space word, whereas D<15:0> refer to a Data
Space word.
TABLE 4-15:
PROGRAM SPACE ADDRESS CONSTRUCTION
Access
Space
Access Type
Instruction Access
(Code Execution)
User
TBLRD/TBLWT
(Byte/Word Read/Write)
User
Program Space Address
<23>
Note 1:
2:
<15>
<14:1>
<0>
PC<22:1>
0
0
0xx xxxx xxxx xxxx xxxx xxx0
Configuration
Program Space Visibility
(Block Remap/Read)
<22:16>
User
TBLPAG<7:0>
Data EA<15:0>
0xxx xxxx
xxxx xxxx xxxx xxxx
TBLPAG<7:0>
Data EA<15:0>
1xxx xxxx
xxxx xxxx xxxx xxxx
0
DSRPAG<7:0>(2)
Data EA<14:0>(1)
0
xxxx xxxx
xxx xxxx xxxx xxxx
Data EA<15> is always ‘1’ in this case, but is not used in calculating the program space address. Bit 15 of
the address is DSRPAG<0>.
DSRPAG<9> is always ‘1’ in this case. DSRPAG<8> decides whether the lower word or higher word of
program memory is read. When DSRPAG<8> is ‘0’, the lower word is read and when it is ‘1’, the higher
word is read.
 2015 Microchip Technology Inc.
DS30010089C-page 83
PIC24FJ256GA412/GB412 FAMILY
FIGURE 4-10:
DATA ACCESS FROM PROGRAM SPACE ADDRESS GENERATION
Program Counter
Program Counter
0
0
23 Bits
EA
Table Operations(2)
1/0
1/0
TBLPAG
8 Bits
16 Bits
24 Bits
Select
Program Space Visibility(1)
(Remapping)
1-Bit
0
1
1/0
EA
DSRPAG<7:0>
8 Bits
15 Bits
23 Bits
User/Configuration
Space Select
Byte Select
Note 1:
DSRPAG<8> acts as word select. DSRPAG<9> should always be ‘1’ to map program memory to data memory.
2:
The instructions, TBLRDH/TBLWTH/TBLRDL/TBLWTL, decide if the higher or lower word of program memory
is accessed. TBLRDH/TBLWTH instructions access the higher word and TBLRDL/TBLWTL instructions access
the lower word. Table Read operations are permitted in the configuration memory space.
DS30010089C-page 84
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
4.4.2
DATA ACCESS FROM PROGRAM
MEMORY USING TABLE
INSTRUCTIONS
The TBLRDL and TBLWTL instructions offer a direct
method of reading or writing the lower word of any
address within the program space without going through
Data Space. The TBLRDH and TBLWTH instructions are
the only method to read or write the upper 8 bits of a
program space word as data.
The PC is incremented by two for each successive
24-bit program word. This allows program memory
addresses to directly map to Data Space addresses.
Program memory can thus be regarded as two, 16-bit
word-wide address spaces, residing side by side, each
with the same address range. TBLRDL and TBLWTL
access the space which contains the least significant
data word, and TBLRDH and TBLWTH access the space
which contains the upper data byte.
Two table instructions are provided to move byte or
word-sized (16-bit) data to and from program space.
Both function as either byte or word operations.
1.
TBLRDL (Table Read Low): In Word mode, it
maps the lower word of the program space
location (P<15:0>) to a data address (D<15:0>).
In Byte mode, either the upper or lower byte of
the lower program word is mapped to the lower
byte of a data address. The upper byte is
selected when byte select is ‘1’; the lower byte
is selected when it is ‘0’.
FIGURE 4-11:
2.
TBLRDH (Table Read High): In Word mode, it
maps the entire upper word of a program address
(P<23:16>) to a data address. Note that
D<15:8>, the ‘phantom’ byte, will always be ‘0’.
In Byte mode, it maps the upper or lower byte of
the program word to D<7:0> of the data
address, as above. Note that the data will
always be ‘0’ when the upper ‘phantom’ byte is
selected (Byte Select = 1).
In a similar fashion, two table instructions, TBLWTH
and TBLWTL, are used to write individual bytes or
words to a program space address. The details of
their operation are described in Section 6.0 “Flash
Program Memory”.
For all table operations, the area of program memory
space to be accessed is determined by the Table
Memory Page Address (TBLPAG) register. TBLPAG
covers the entire program memory space of the
device, including user and configuration spaces. When
TBLPAG<7> = 0, the table page is located in the user
memory space. When TBLPAG<7> = 1, the page is
located in configuration space.
Note:
Only Table Read operations will execute
in the configuration memory space where
Device IDs are located. Table Write
operations are not allowed.
ACCESSING PROGRAM MEMORY WITH TABLE INSTRUCTIONS
Program Space
TBLPAG
02
Data EA<15:0>
23
15
0
000000h
23
16
8
0
00000000
020000h
030000h
00000000
00000000
00000000
‘Phantom’ Byte
TBLRDH.B (Wn<0> = 0)
TBLRDL.B (Wn<0> = 1)
TBLRDL.B (Wn<0> = 0)
TBLRDL.W
800000h
 2015 Microchip Technology Inc.
The address for the table operation is determined by the data EA
within the page defined by the TBLPAG register.
Only read operations are shown; write operations are also valid in
the user memory area.
DS30010089C-page 85
PIC24FJ256GA412/GB412 FAMILY
4.4.3
READING DATA FROM PROGRAM
MEMORY USING EDS
The upper 32 Kbytes of Data Space may optionally be
mapped into any 16K word page of the program space.
This provides transparent access of stored constant
data from the Data Space without the need to use
special instructions (i.e., TBLRDL/H).
Program space access through the Data Space occurs
when the MSb of EA is ‘1’ and the DSRPAG<9> is also
‘1’. The lower 8 bits of DSRPAG are concatenated to the
Wn<14:0> bits to form a 23-bit EA to access program
memory. The DSRPAG<8> decides which word should
be addressed; when the bit is ‘0’, the lower word and
when ‘1’, the upper word of the program memory is
accessed.
The entire program memory is divided into 512 EDS
pages, from 200h to 3FFh, each consisting of 16K words
of data. Pages, 200h to 2FFh, correspond to the lower
words of the program memory, while 300h to 3FFh
correspond to the upper words of the program memory.
Using this EDS technique, the entire program memory
can be accessed. Previously, the access to the upper
word of the program memory was not supported.
TABLE 4-16:
For operations that use PSV, and are executed outside
a REPEAT loop, the MOV and MOV.D instructions will
require one instruction cycle in addition to the specified
execution time. All other instructions will require two
instruction cycles in addition to the specified execution
time.
For operations that use PSV, which are executed inside
a REPEAT loop, there will be some instances that
require two instruction cycles in addition to the
specified execution time of the instruction:
• Execution in the first iteration
• Execution in the last iteration
• Execution prior to exiting the loop due to an
interrupt
• Execution upon re-entering the loop after an
interrupt is serviced
Any other iteration of the REPEAT loop will allow the
instruction accessing data, using PSV, to execute in a
single cycle.
EDS PROGRAM ADDRESS WITH DIFFERENT PAGES AND ADDRESSES
DSRPAG
(Data Space Read Register)
Source Address While
Indirect Addressing
200h
•
•
•
2FFh
300h
•
•
•
3FFh
000h
Note 1:
Table 4-16 provides the corresponding 23-bit EDS
address for program memory with EDS page and
source addresses.
8000h to FFFFh
23-Bit EA Pointing
to EDS
Comment
000000h to 007FFEh
•
•
•
7F8000h to 7FFFFEh
Lower words of 4M program
instructions; (8 Mbytes) for
read operations only
000001h to 007FFFh
•
•
•
7F8001h to 7FFFFFh
Upper words of 4M program
instructions (4 Mbytes remaining,
4 Mbytes are phantom bytes); for
read operations only
Invalid Address
Address error trap(1)
When the source/destination address is above 8000h and DSRPAG/DSWPAG are ‘0’, an address error
trap will occur.
EXAMPLE 4-3:
EDS READ CODE FROM PROGRAM MEMORY IN ASSEMBLY
; Set the EDS page from where the data to be read
mov
#0x0202, w0
mov
w0, DSRPAG
;page 0x202, consisting lower words, is selected for read
mov
#0x000A, w1
;select the location (0x0A) to be read
bset
w1, #15
;set the MSB of the base address, enable EDS mode
;Read a byte from the selected location
mov.b
[w1++], w2
;read Low byte
mov.b
[w1++], w3
;read High byte
;Read a word from the selected location
mov
[w1], w2
;
;Read Double - word from the selected location
mov.d
[w1], w2
;two word read, stored in w2 and w3
DS30010089C-page 86
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
FIGURE 4-12:
PROGRAM SPACE VISIBILITY OPERATION TO ACCESS LOWER WORD
When DSRPAG<9:8> = 10 and EA<15> = 1:
Program Space
DSRPAG
202h
23
15
Data Space
0
000000h
0000h
Data EA<14:0>
010000h
017FFEh
The data in the page
designated by
DSRPAG is mapped
into the upper half of
the data memory
space....
8000h
EDS Window
FFFFh
7FFFFEh
FIGURE 4-13:
...while the lower
15 bits of the EA
specify an exact
address within the
EDS area. This corresponds exactly to the
same lower 15 bits of
the actual program
space address.
PROGRAM SPACE VISIBILITY OPERATION TO ACCESS UPPER WORD
When DSRPAG<9:8> = 11 and EA<15> = 1:
Program Space
DSRPAG
302h
23
15
Data Space
0
000000h
0000h
Data EA<14:0>
010001h
017FFFh
The data in the page
designated by
DSRPAG is mapped
into the upper half of
the data memory
space....
8000h
EDS Window
FFFFh
7FFFFEh
 2015 Microchip Technology Inc.
...while the lower
15 bits of the EA
specify an exact
address within the
EDS area. This corresponds exactly to the
same lower 15 bits of
the actual program
space address.
DS30010089C-page 87
PIC24FJ256GA412/GB412 FAMILY
NOTES:
DS30010089C-page 88
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
5.0
DIRECT MEMORY ACCESS
CONTROLLER (DMA)
Note:
The controller also monitors CPU instruction processing directly, allowing it to be aware of when the CPU
requires access to peripherals on the DMA bus and
automatically relinquishing control to the CPU as
needed. This increases the effective bandwidth for
handling data without DMA operations causing a
processor stall. This makes the controller essentially
transparent to the user.
This data sheet summarizes the features of
this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to
the “dsPIC33/PIC24 Family Reference
Manual”, “Direct Memory Access
Controller (DMA)” (DS39742). The information in this data sheet supersedes the
information in the FRM.
The DMA Controller has these features:
• Six Multiple Independent and Independently
Programmable Channels
• Concurrent Operation with the CPU (no DMA
caused Wait states)
• DMA Bus Arbitration
• Five Programmable Address modes
• Four Programmable Transfer modes
• Four Flexible Internal Data Transfer modes
• Byte or Word Support for Data Transfer
• 16-Bit Source and Destination Address Register
for Each Channel, Dynamically Updated and
Reloadable
• 16-Bit Transaction Count Register, Dynamically
Updated and Reloadable
• Upper and Lower Address Limit Registers
• Counter Half-Full Level Interrupt
• Software Triggered Transfer
• Null Write mode for Symmetric Buffer Operations
The Direct Memory Access Controller (DMA) is
designed to service high data throughput peripherals
operating on the SFR bus, allowing them to access
data memory directly and alleviating the need for CPU
intensive management. By allowing these data intensive peripherals to share their own data path, the main
data bus is also deloaded, resulting in additional power
savings.
The DMA Controller functions both as a peripheral and
a direct extension of the CPU. It is located on the
microcontroller data bus between the CPU and
DMA-enabled peripherals, with direct access to SRAM.
This partitions the SFR bus into two buses, allowing the
DMA Controller access to the DMA-capable peripherals
located on the new DMA SFR bus. The controller
serves as a master device on the DMA SFR bus,
controlling data flow from DMA-capable peripherals.
FIGURE 5-1:
A simplified block diagram of the DMA Controller is
shown if Figure 5-1.
DMA FUNCTIONAL BLOCK DIAGRAM
CPU Execution Monitoring
To DMA-Enabled
Peripherals
To I/O Ports
and Peripherals
Control
Logic
DMACON
DMAH
DMAL
DMABUF
Data
Bus
DMACH0
DMAINT0
DMASRC0
DMADST0
DMACNT0
DMACH1
DMAINT1
DMASRC1
DMADST1
DMACNT1
DMACH2
DMAINT2
DMASRC2
DMADST2
DMACNT2
DMACHn
DMAINTn
DMASRCn
DMADSTn
DMACNTn
Channel 0
Channel 1
Channel 2
Channel n
Data RAM
 2015 Microchip Technology Inc.
Data RAM
Address Generation
DS30010089C-page 89
PIC24FJ256GA412/GB412 FAMILY
5.1
Summary of DMA Operations
The DMA Controller is capable of moving data between
addresses according to a number of different parameters. Each of these parameters can be independently
configured for any transaction. In addition, any or all of
the DMA channels can independently perform a different
transaction at the same time. Transactions are classified
by these parameters:
•
•
•
•
Source and destination (SFRs and data RAM)
Data size (byte or word)
Trigger source
Transfer mode (One-Shot, Repeated or
Continuous)
• Addressing modes (Fixed Address or
Address Blocks with or without Address
Increment/Decrement)
In addition, the DMA Controller provides channel priority
arbitration for all channels.
5.1.1
SOURCE AND DESTINATION
Using the DMA Controller, data may be moved between
any two addresses in the Data Space. The SFR space
(0000h to 07FFh) or the data RAM space (0800h to
FFFFh) can serve as either the source or the destination. Data can be moved between these areas in either
direction or between addresses in either area. The four
different combinations are shown in Figure 5-2.
If it is necessary to protect areas of data RAM, the DMA
Controller allows the user to set upper and lower address
boundaries for operations in the Data Space above the
SFR space. The boundaries are set by the DMAH and
DMAL Limit registers. If a DMA channel attempts an
operation outside of the address boundaries, the
transaction is terminated and an interrupt is generated.
5.1.2
DATA SIZE
The DMA Controller can handle both 8-bit and 16-bit
transactions. Size is user-selectable using the SIZE bit
(DMACHn<1>). By default, each channel is configured
for word-size transactions. When byte-size transactions are chosen, the LSb of the source and/or
destination address determines if the data represents
the upper or lower byte of the data RAM location.
5.1.3
TRIGGER SOURCE
The DMA Controller can use 63 of the device’s interrupt
sources to initiate a transaction. The DMA trigger
sources occur in reverse order than their natural
interrupt priority and are shown in Table 5-1.
DS30010089C-page 90
Since the source and destination addresses for any
transaction can be programmed independently of the
trigger source, the DMA Controller can use any trigger
to perform an operation on any peripheral. This also
allows DMA channels to be cascaded to perform more
complex transfer operations.
5.1.4
TRANSFER MODE
The DMA Controller supports four types of data
transfers, based on the volume of data to be moved for
each trigger.
• One-Shot: A single transaction occurs for each
trigger.
• Continuous: A series of back-to-back transactions
occur for each trigger; the number of transactions is
determined by the DMACNTn transaction counter.
• Repeated One-Shot: A single transaction is performed repeatedly, once per trigger, until the DMA
channel is disabled.
• Repeated Continuous: A series of transactions
are performed repeatedly, one cycle per trigger,
until the DMA channel is disabled.
All transfer modes allow the option to have the source
and destination addresses, and counter value, automatically reloaded after the completion of a transaction;
Repeated mode transfers do this automatically.
5.1.5
ADDRESSING MODES
The DMA Controller also supports transfers between
single addresses or address ranges. The four basic
options are:
• Fixed-to-Fixed: Between two constant addresses
• Fixed-to-Block: From a constant source address
to a range of destination addresses
• Block-to-Fixed: From a range of source addresses
to a single, constant destination address
• Block-to-Block: From a range of source
addresses to a range of destination addresses
The option to select auto-increment or auto-decrement
of source and/or destination addresses is available for
Block Addressing modes.
In addition to the four basic modes, the DMA Controller
also supports Peripheral Indirect Addressing (PIA)
mode, where the source or destination address is generated jointly by the DMA Controller and a PIA-capable
peripheral. When enabled, the DMA channel provides
a base source and/or destination address, while the
peripheral provides a fixed range offset address.
For PIC24FJ256GA412/GB412 family devices, the
12-bit A/D Converter module is the only PIA-capable
peripheral. Details for its use in PIA mode are provided
in Section 27.0 “12-Bit A/D Converter with Threshold
Detect”.
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
FIGURE 5-2:
TYPES OF DMA DATA TRANSFERS
Peripheral to Memory
Memory to Peripheral
SFR Area
SFR Area
DMASRCn
Data RAM
07FFh
0800h
DMAL
DMA RAM Area
DMADSTn
Data RAM
DMA RAM Area
07FFh
0800h
DMAL
DMADSTn
DMASRCn
DMAH
DMAH
Peripheral to Peripheral
Memory to Memory
SFR Area
SFR Area
DMASRCn
DMADSTn
Data RAM
DMA RAM Area
07FFh
0800h
DMAL
Data RAM
DMA RAM Area
07FFh
0800h
DMAL
DMASRCn
DMADSTn
DMAH
Note:
DMAH
Relative sizes of memory areas are not shown to scale.
 2015 Microchip Technology Inc.
DS30010089C-page 91
PIC24FJ256GA412/GB412 FAMILY
5.1.6
CHANNEL PRIORITY
Each DMA channel functions independently of the
others, but also competes with the others for access to
the data and DMA buses. When access collisions
occur, the DMA Controller arbitrates between the
channels using a user-selectable priority scheme. Two
schemes are available:
• Round Robin: When two or more channels collide,
the lower numbered channel receives priority on
the first collision. On subsequent collisions, the
higher numbered channels each receive priority
based on their channel number.
• Fixed: When two or more channels collide, the
lowest numbered channel always receives
priority, regardless of past history; however, any
channel being actively processed is not available
for an immediate retrigger. If a higher priority
channel is continually requesting service, it will be
scheduled for service after the next lower priority
channel with a pending request.
5.2
Typical Setup
To set up a DMA channel for a basic data transfer:
1.
Enable the DMA Controller (DMAEN = 1) and
select an appropriate channel priority scheme
by setting or clearing PRSSEL.
2. Program DMAH and DMAL with appropriate
upper and lower address boundaries for data
RAM operations.
3. Select the DMA channel to be used and disable
its operation (CHEN = 0).
4. Program the appropriate source and destination
addresses for the transaction into the channel’s
DMASRCn and DMADSTn registers. For PIA
Addressing mode, use the base address value.
5. Program the DMACNTn register for the number
of triggers per transfer (One-Shot or Continuous
modes) or the number of words (bytes) to be
transferred (Repeated modes).
6. Set or clear the SIZE bit to select the data size.
7. Program the TRMODE<1:0> bits to select the
Data Transfer mode.
8. Program the SAMODE<1:0> and DAMODE<1:0>
bits to select the addressing mode.
9. Enable the DMA channel by setting CHEN.
10. Enable the trigger source interrupt.
DS30010089C-page 92
5.3
Peripheral Module Disable
Unlike other peripheral modules, the channels of the
DMA Controller cannot be individually powered down
using the Peripheral Module Disable (PMD) registers.
Instead, the channels are controlled as two groups.
The DMA0MD bit (PMD7<4>) selectively controls
DMACH0 through DMACH3. The DMA1MD bit
(PMD7<5>) controls DMACH4 and DMACH5. Setting
both bits effectively disables the DMA Controller.
5.4
Registers
The DMA Controller uses a number of registers to control its operation. The number of registers depends on
the number of channels implemented for a particular
device.
There are always four module-level registers (one
control and three buffer/address):
• DMACON: DMA Engine Control Register
(Register 5-1)
• DMAH and DMAL: DMA High and Low Address
Limit Registers
• DMABUF: DMA Transfer Data Buffer
Each of the DMA channels implements five registers
(two control and three buffer/address):
• DMACHn: DMA Channel n Control Register
(Register 5-2)
• DMAINTn: DMA Channel n Interrupt Register
(Register 5-3)
• DMASRCn: DMA Data Source Address Pointer
for Channel n Register
• DMADSTn: DMA Data Destination Source for
Channel n Register
• DMACNTn: DMA Transaction Counter for
Channel n Register
For PIC24FJ256GA412/GB412 family devices, there
are a total of 34 registers.
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 5-1:
DMACON: DMA ENGINE CONTROL REGISTER
R/W-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
DMAEN
—
—
—
—
—
—
—
bit 15
bit 8
U-0
U-0
U-0
U-0
U-0
U-0
U-0
R/W-0
—
—
—
—
—
—
—
PRSSEL
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
x = Bit is unknown
DMAEN: DMA Module Enable bit
1 = Enables module
0 = Disables module and terminates all active DMA operation(s)
bit 14-1
Unimplemented: Read as ‘0’
bit 0
PRSSEL: Channel Priority Scheme Selection bit
1 = Round robin scheme
0 = Fixed priority scheme
 2015 Microchip Technology Inc.
DS30010089C-page 93
PIC24FJ256GA412/GB412 FAMILY
REGISTER 5-2:
DMACHn: DMA CHANNEL n CONTROL REGISTER
U-0
U-0
U-0
r-0
U-0
R/W-0
R/W-0
R/W-0
—
—
—
—
—
NULLW
RELOAD(1)
CHREQ(3)
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
SAMODE1
SAMODE0
DAMODE1
DAMODE0
TRMODE1
TRMODE0
SIZE
CHEN
bit 7
bit 0
Legend:
r = Reserved bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-13
x = Bit is unknown
Unimplemented: Read as ‘0’
bit 12
Reserved: Maintain as ‘0’
bit 11
Unimplemented: Read as ‘0’
bit 10
NULLW: Null Write Mode bit
1 = A dummy write is initiated to DMASRCn for every write to DMADSTn
0 = No dummy write is initiated
bit 9
RELOAD: Address and Count Reload bit(1)
1 = DMASRCn, DMADSTn and DMACNTn registers are reloaded to their previous values upon the
start of the next operation
0 = DMASRCn, DMADSTn and DMACNTn are not reloaded on the start of the next operation(2)
bit 8
CHREQ: DMA Channel Software Request bit(3)
1 = A DMA request is initiated by software; automatically cleared upon completion of a DMA transfer
0 = No DMA request is pending
bit 7-6
SAMODE<1:0>: Source Address Mode Selection bits
11 = DMASRCn is used in Peripheral Indirect Addressing and remains unchanged
10 = DMASRCn is decremented based on the SIZE bit after a transfer completion
01 = DMASRCn is incremented based on the SIZE bit after a transfer completion
00 = DMASRCn remains unchanged after a transfer completion
bit 5-4
DAMODE<1:0>: Destination Address Mode Selection bits
11 = DMADSTn is used in Peripheral Indirect Addressing and remains unchanged
10 = DMADSTn is decremented based on the SIZE bit after a transfer completion
01 = DMADSTn is incremented based on the SIZE bit after a transfer completion
00 = DMADSTn remains unchanged after a transfer completion
bit 3-2
TRMODE<1:0>: Transfer Mode Selection bits
11 = Repeated Continuous mode
10 = Continuous mode
01 = Repeated One-Shot mode
00 = One-Shot mode
bit 1
SIZE: Data Size Selection bit
1 = Byte (8-bit)
0 = Word (16-bit)
bit 0
CHEN: DMA Channel Enable bit
1 = The corresponding channel is enabled
0 = The corresponding channel is disabled
Note 1:
2:
3:
Only the original DMACNTn is required to be stored to recover the original DMASRCn and DMADSTn values.
DMACNTn will always be reloaded in Repeated mode transfers, regardless of the state of the RELOAD bit.
The number of transfers executed while CHREQ is set depends on the configuration of TRMODE<1:0>.
DS30010089C-page 94
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 5-3:
R-0
DBUFWF
(1)
DMAINTn: DMA CHANNEL n INTERRUPT REGISTER
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
CHSEL6
CHSEL5
CHSEL4
CHSEL3
CHSEL2
CHSEL1
CHSEL0
bit 15
bit 8
R/W-0
HIGHIF
R/W-0
(1,2)
LOWIF
R/W-0
(1,2)
R/W-0
(1)
DONEIF
(1)
HALFIF
R/W-0
OVRUNIF
(1)
U-0
U-0
R/W-0
—
—
HALFEN
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
DBUFWF: DMA Buffered Data Write Flag bit(1)
1 = The content of the DMA buffer has not been written to the location specified in DMADSTn or
DMASRCn in Null Write mode
0 = The content of the DMA buffer has been written to the location specified in DMADSTn or
DMASRCn in Null Write mode
bit 14-8
CHSEL<6:0>: DMA Channel Trigger Selection bits
See Table 5-1 for a complete list.
bit 7
HIGHIF: DMA High Address Limit Interrupt Flag bit(1,2)
1 = The DMA channel has attempted to access an address higher than DMAH or the upper limit of the
data RAM space
0 = The DMA channel has not invoked the high address limit interrupt
bit 6
LOWIF: DMA Low Address Limit Interrupt Flag bit(1,2)
1 = The DMA channel has attempted to access the DMA SFR address lower than DMAL, but above
the SFR range (07FFh)
0 = The DMA channel has not invoked the low address limit interrupt
bit 5
DONEIF: DMA Complete Operation Interrupt Flag bit(1)
If CHEN = 1:
1 = The previous DMA session has ended with completion
0 = The current DMA session has not yet completed
If CHEN = 0:
1 = The previous DMA session has ended with completion
0 = The previous DMA session has ended without completion
bit 4
HALFIF: DMA 50% Watermark Level Interrupt Flag bit(1)
1 = DMACNTn has reached the halfway point to 0000h
0 = DMACNTn has not reached the halfway point
bit 3
OVRUNIF: DMA Channel Overrun Flag bit(1)
1 = The DMA channel is triggered while it is still completing the operation based on the previous trigger
0 = The overrun condition has not occurred
bit 2-1
Unimplemented: Read as ‘0’
bit 0
HALFEN: Halfway Completion Watermark bit
1 = Interrupts are invoked when DMACNTn has reached its halfway point and at completion
0 = An interrupt is invoked only at the completion of the transfer
Note 1:
2:
Setting these flags in software does not generate an interrupt.
Testing for address limit violations (DMASRCn or DMADSTn is either greater than DMAH or less than
DMAL) is NOT done before the actual access.
 2015 Microchip Technology Inc.
DS30010089C-page 95
PIC24FJ256GA412/GB412 FAMILY
TABLE 5-1:
CHSEL<6:0>
DMA CHANNEL TRIGGER SOURCES
Trigger (Interrupt)
CHSEL<6:0>
Trigger (Interrupt)
CHSEL<6:0>
Trigger (Interrupt)
0000000 00h
(Unimplemented)
0100110 26h
SPI1 Receive Event
1001100 4Ch
DMA Channel 4
0000001 01h
SCCP7 IC/OC Event
0100111 27h
SPI1 Transmit Event
1001101 4Dh
DMA Channel 3
DMA Channel 2
0000010 02h
SCCP7 Timer
0101000 28h
SPI1 General Event
1001110 4Eh
0000011 03h
SCCP6 IC/OC Event
0101001 29h
(Reserved, do not use)
1001111 4Fh
DMA Channel 1
0000100 04h
SCCP6 Timer
0101010 2Ah
(Reserved, do not use)
1010000 50h
DMA Channel 0
0000101 05h
SCCP5 IC/OC Event
0101011 2Bh
(Reserved, do not use)
1010001 51h
A/D Converter
0000110 06h
SCCP5 Timer
0101100 2Ch
I2C3 Slave Event
1010010 52h
USB
0000111 07h
SCCP4 IC/OC Event
0101101 2Dh
I2C3 Master Event
1010011 53h
EPMP
0001000 08h
SCCP4 Timer
0101110 2Eh
I2C3 Collision Event
1010100 54h
HLVD
0001001 09h
(Reserved, do not use)
0101111 2Fh
I2C2 Slave Event
1010101 55h
CRC Done
0001010 0Ah
(Reserved, do not use)
0110000 30h
I2C2 Master Event
1010110 56h
LCD
0001011 0Bh
MCCP3 IC/OC Event
0110001 31h
I2C2 Collision Event
1010111 57h
Crypto Done
0001100 0Ch
MCCP3 Timer
0110010 32h
I2C1 Slave Event
1011000 58h
Crypto OTP Done
0001101 0Dh
MCCP2 IC/OC Event
0110011 33h
I2C1 Master Event
1011001 59h
CLC4 Output
0001110 0Eh
MCCP2 Timer
0110100 34h
I2C1 Collision Event
1011010 5Ah
CLC3 Output
0001111 0Fh
MCCP1 IC/OC Event
0110101 35h
UART6 Transmit
1011011 5Bh
CLC2 Output
0010000 10h
MCCP1 Timer
0110110 36h
UART6 Receive
1011100 5Ch
CLC1 Output
0010001 11h
Output Compare 6
0110111 37h
UART6 Error
1011101 5Dh
(Reserved, do not use)
0010010 12h
Output Compare 5
0111000 38h
UART5 Transmit
1011110 5Eh
RTCC
0010011 13h
Output Compare 4
0111001 39h
UART5 Receive
1011111 5Fh
Timer5
0010100 14h
Output Compare 3
0111010 3Ah
UART5 Error
1100000 60h
Timer4
0010101 15h
Output Compare 2
0111011 3Bh
UART4 Transmit
1100001 61h
Timer3
0010110 16h
Output Compare 1
0111100 3Ch
UART4 Receive
1100010 62h
Timer2
0010111 17h
Input Capture 6
0111101 3Dh
UART4 Error
1100011 63h
Timer1
0011000 18h
Input Capture 5
0111110 3Eh
UART3 Transmit
1100100 64h
(Reserved, do not use)
0011001 19h
Input Capture 4
0111111 3Fh
UART3 Receive
1100101 65h
DAC
0011010 1Ah
Input Capture 3
1000000 40h
UART3 Error
1100110 66h
CTMU
0011011 1Bh
Input Capture 2
1000001 41h
UART2 Transmit
1100111 67h
Comparators Event
0011100 1Ch
Input Capture 1
1000010 42h
UART2 Receive
1101000 68h
External Interrupt 4
0011101 1Dh
SPI4 Receive Event
1000011 43h
UART2 Error
1101001 69h
External Interrupt 3
0011110 1Eh
SPI4 Transmit Event
1000100 44h
UART1 Transmit
1101010 6Ah
External Interrupt 2
0011111 1Fh
SPI4 General Event
1000101 45h
UART1 Receive
1101011 6Bh
External Interrupt 1
0100000 20h
SPI3 Receive Event
1000110 46h
UART1 Error
1101100 6Ch
External Interrupt 0
0100001 21h
SPI3 Transmit Event
1000111 47h
(Reserved, do not use)
1101101 6Dh
Interrupt-On-Change
1101110 6Eh
0100010 22h
SPI3 General Event
1001000 48h
(Reserved, do not use)
0100011 23h
SPI2 Receive Event
1001001 49h
(Reserved, do not use)
0100100 24h
SPI2 Transmit Event
1001010 4Ah
(Reserved, do not use)
0100101 25h
SPI2 General Event
1001011 4Bh
DMA Channel 5
DS30010089C-page 96
•
•
•
•
•
•
(Unimplemented)
1111111 7Fh
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
6.0
Note:
FLASH PROGRAM MEMORY
RTSP is accomplished using TBLRD (Table Read) and
TBLWT (Table Write) instructions. With RTSP, the user
may write program memory data in blocks of 64 instructions (192 bytes) at a time and erase program memory
in blocks of 512 instructions (1536 bytes) at a time.
This data sheet summarizes the features of
this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to
the “dsPIC33/PIC24F Family Reference
Manual”, “Dual Partition Flash Program
Memory” (DS70005156). The information in this data sheet supersedes the
information in the FRM.
6.1
Regardless of the method used, all programming of
Flash memory is done with the Table Read and Table
Write instructions. These allow direct read and write
access to the program memory space from the data
memory while the device is in normal operating mode.
The 24-bit target address in the program memory is
formed using the TBLPAG<7:0> bits and the Effective
Address (EA) from a W register, specified in the table
instruction, as shown in Figure 6-1.
The PIC24FJ256GA412/GB412 family of devices contains internal Flash program memory for storing and
executing application code. The program memory is
readable, writable and erasable. The Flash memory
can be programmed in three ways:
• In-Circuit Serial Programming™ (ICSP™)
• Run-Time Self-Programming (RTSP)
• Enhanced In-Circuit Serial Programming
(Enhanced ICSP)
The TBLRDL and the TBLWTL instructions are used to
read or write to bits<15:0> of program memory.
TBLRDL and TBLWTL can access program memory in
both Word and Byte modes.
ICSP allows a PIC24FJ256GA412/GB412 family
device to be serially programmed while in the end
application circuit. This is simply done with two lines for
the programming clock and programming data (named
PGECx and PGEDx, respectively), and three other
lines for power (VDD), ground (VSS) and Master Clear
(MCLR). This allows customers to manufacture boards
with unprogrammed devices and then program the
microcontroller just before shipping the product. This
also allows the most recent firmware or a custom
firmware to be programmed.
FIGURE 6-1:
Table Instructions and Flash
Programming
The TBLRDH and TBLWTH instructions are used to read
or write to bits<23:16> of program memory. TBLRDH
and TBLWTH can also access program memory in Word
or Byte mode.
ADDRESSING FOR TABLE REGISTERS
24 Bits
Using
Program
Counter
Program Counter
0
0
Working Reg EA
Using
Table
Instruction
1/0
TBLPAG Reg
8 Bits
User/Configuration
Space Select
 2015 Microchip Technology Inc.
16 Bits
24-Bit EA
Byte
Select
DS30010089C-page 97
PIC24FJ256GA412/GB412 FAMILY
6.2
RTSP Operation
The PIC24F Flash program memory array is organized
into rows of 64 instructions or 192 bytes. RTSP allows
the user to erase blocks of eight rows (512 instructions)
at a time and to program one row at a time. It is also
possible to program two words.
The 8-row erase blocks and single row write blocks are
edge-aligned, from the beginning of program memory on
boundaries of 1536 bytes and 192 bytes, respectively.
When data is written to program memory using TBLWT
instructions, the data is not written directly to memory.
Instead, data written using Table Writes is stored in
holding latches until the programming sequence is
executed.
Any number of TBLWT instructions can be executed
and a write will be successfully performed. However,
64 TBLWT instructions are required to write the full row
of memory.
To ensure that no data is corrupted during a write, any
unused address should be programmed with
FFFFFFh. This is because the holding latches reset to
an unknown state, so if the addresses are left in the
Reset state, they may overwrite the locations on rows
which were not rewritten.
The basic sequence for RTSP programming is:
• Set up a Table Pointer to point to the programming
latches
• Perform a series of TBLWT instructions to load the
buffers
• Set the NVM Address registers to point to the
destination
Programming is performed by setting the control bits in
the NVMCON register.
Data can be loaded in any order and the holding registers can be written to multiple times before performing
a write operation. Subsequent writes, however, will
wipe out any previous writes.
Note:
6.3
JTAG Operation
The PIC24F family supports JTAG boundary scan.
Boundary scan can improve the manufacturing
process by verifying pin to PCB connectivity.
6.4
Enhanced In-Circuit Serial
Programming
Enhanced In-Circuit Serial Programming uses an
on-board bootloader, known as the Program Executive
(PE), to manage the programming process. Using an
SPI data frame format, the Program Executive can
erase, program and verify program memory. For more
information on Enhanced ICSP, see the device
programming specification.
6.5
Control Registers
There are four SFRs used to read and write the
program Flash memory:
•
•
•
•
NVMCON
NVMKEY
NVMADRL
NVMADRH
The NVMCON register (Register 6-1) controls which
blocks are to be erased, which memory type is to be
programmed and when the programming cycle starts.
NVMKEY is a write-only register that is used for write
protection. To start a programming or erase sequence,
the user must consecutively write 55h and AAh to the
NVMKEY register. For more information, refer to
Section 6.6 “Programming Operations”.
The NVMADRL and NVMADRH registers contain the
lower word and upper byte of the destination address
of the NVM write or erase operation. Some operations
(e.g., chip erase, Inactive Partition erase) operate on
fixed locations and do not require an address value.
Writing to a location multiple times without
erasing is not recommended.
All of the Table Write operations are single-word writes
(2 instruction cycles), because only the buffers are
written. A programming cycle is required for
programming each row.
DS30010089C-page 98
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 6-1:
NVMCON: FLASH MEMORY CONTROL REGISTER
R/S-0, HC(1)
R/W-0(1)
R-0, HSC(1)
R/W-0
R/C-0, HSC(2)
R-0
U-0
U-0
WR
WREN
WRERR
NVMPIDL
SFTSWP
P2ACTIV
—
—
bit 15
U-0
—
bit 8
R/W-0(1)
U-0
ERASE
—
R/W-0(1)
U-0
(3)
—
NVMOP3
R/W-0(1)
(3)
NVMOP2
R/W-0(1)
(3)
NVMOP1
R/W-0(1)
NVMOP0(3)
bit 7
bit 0
Legend:
S = Settable bit
U = Unimplemented, read as ‘0’
R = Readable bit
W = Writable bit
HSC = Hardware Settable/Clearable bit
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
C = Clearable bit
HC = Hardware Clearable bit
x = Bit is unknown
bit 15
WR: Write Control bit(1)
1 = Initiates a Flash memory program or erase operation; the operation is self-timed and the bit is
cleared by hardware once the operation is complete
0 = Program or erase operation is complete and inactive
bit 14
WREN: Write Enable bit(1)
1 = Enables Flash program/erase operations
0 = Inhibits Flash program/erase operations
bit 13
WRERR: Write Sequence Error Flag bit(1)
1 = An improper program or erase sequence attempt, or termination has occurred (bit is set
automatically on any set attempt of the WR bit)
0 = The program or erase operation completed normally
bit 12
NVMPIDL: NVM Power-Down in Idle Enable bit
1 = Removes power from program memory when device enters Idle mode
0 = Keeps program memory powered in Standby mode when device enters Idle mode
bit 11
SFTSWP: Soft Swap Status bit(2)
In Dual Partition Flash Modes (BTMOD<1:0> = 10 or 0x):
1 = Partitions have been successfully swapped using the BOOTSWP instruction
0 = Awaiting successful partition swap using the BOOTSWP instruction
In Single Partition Flash Mode (BTMOD<1:0> = 11):
Unimplemented, read as ‘0’.
bit 10
P2ACTIV: Dual Active Partition Status bit
In Dual Partition Flash Modes (BTMOD<1:0> = 10 or 0x):
1 = Partition 2 Flash is the Active Partition
0 = Partition 1 Flash is the Active Partition
In Single Partition Flash Mode (BTMOD<1:0> = 11):
Unimplemented, read as ‘0’.
bit 9-7
Unimplemented: Read as ‘0’
bit 6
ERASE: Erase/Program Enable bit(1)
1 = Performs the erase operation specified by the NVMOP<3:0> bits on the next WR command
0 = Performs the program operation specified by the NVMOP<3:0> bits on the next WR command
Note 1:
2:
3:
4:
These bits can only be reset on a Power-on Reset.
Clearable in software, as well as on device Resets.
All other combinations of NVMOP<3:0> are unimplemented in this device family.
Available only in Dual Partition modes (BTMOD<1:0> = 10 or 0x).
 2015 Microchip Technology Inc.
DS30010089C-page 99
PIC24FJ256GA412/GB412 FAMILY
REGISTER 6-1:
NVMCON: FLASH MEMORY CONTROL REGISTER (CONTINUED)
bit 5-4
Unimplemented: Read as ‘0’
bit 3-0
NVMOP<3:0>: NVM Operation Select bits(1,3)
1110 = Chip erase operation, ERASE = 1 (does not erase Device ID, OTP or Program Executive)
0100 = Erase Inactive Partition, ERASE = 1 (user memory and Configuration Words)(4)
0011 = Memory page erase operation, ERASE = 1 (program or executive memory)
0010 = Memory row program operation, ERASE = 0
0001 = Memory double-word program operation, ERASE = 0
Note 1:
2:
3:
4:
6.6
These bits can only be reset on a Power-on Reset.
Clearable in software, as well as on device Resets.
All other combinations of NVMOP<3:0> are unimplemented in this device family.
Available only in Dual Partition modes (BTMOD<1:0> = 10 or 0x).
Programming Operations
A complete programming sequence is necessary for
programming or erasing the internal Flash in RTSP
mode. During a programming or erase operation, the
processor stalls (waits) until the operation is finished.
Setting the WR bit (NVMCON<15>) starts the operation
and the WR bit is automatically cleared when the operation is finished. In Dual Partition modes, programming or
DS30010089C-page 100
erasing the Inactive Partition does not stall the
processor; the code in the Active Partition continues to
execute during the programming operation.
For more information on programming the device,
please refer to the “dsPIC33/PIC24 Family Reference
Manual”, “Dual Partition Flash Program Memory”
(DS70005156).
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
7.0
Note:
RESETS
This data sheet summarizes the features of
this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to
the “dsPIC33/PIC24 Family Reference
Manual”, “Reset” (DS39712). The information in this data sheet supersedes the
information in the FRM.
The Reset module combines all Reset sources and
controls the device Master Reset Signal, SYSRST. The
following is a list of device Reset sources:
•
•
•
•
•
•
•
•
•
POR: Power-on Reset
MCLR: Master Clear Pin Reset
SWR: RESET Instruction
WDT: Watchdog Timer Reset
BOR: Brown-out Reset
CM: Configuration Mismatch Reset
TRAPR: Trap Conflict Reset
IOPUWR: Illegal Opcode Reset
UWR: Uninitialized W Register Reset
Any active source of Reset will make the SYSRST
signal active. Many registers associated with the CPU
and peripherals are forced to a known Reset state.
Most registers are unaffected by a Reset; their status is
unknown on POR and unchanged by all other Resets.
Note:
All types of device Reset will set a corresponding status
bit in the RCON register to indicate the type of Reset
(see Register 7-1). In addition, Reset events occurring
while an extreme power-saving feature is in use (such
as VBAT) will set one or more status bits in the RCON2
register (Register 7-2). A POR will clear all bits, except
for the BOR and POR (RCON<1:0>) bits, which are
set. The user may set or clear any bit at any time during
code execution. The RCON bits only serve as status
bits. Setting a particular Reset status bit in software will
not cause a device Reset to occur.
The RCON register also has other bits associated with
the Watchdog Timer and device power-saving states.
The function of these bits is discussed in other sections
of this data sheet.
A simplified block diagram of the Reset module is
shown in Figure 7-1.
FIGURE 7-1:
Refer to the specific peripheral or CPU
section of this data sheet for register
Reset states.
Note:
The status bits in the RCON registers
should be cleared after they are read so
that the next RCON register values after a
device Reset will be meaningful.
RESET SYSTEM BLOCK DIAGRAM
RESET
Instruction
Glitch Filter
MCLR
WDT
Module
Sleep or Idle
VDD Rise
Detect
POR
Brown-out
Reset
BOR
SYSRST
VDD
Enable Voltage Regulator
Trap Conflict
Illegal Opcode
Configuration Mismatch
Uninitialized W Register
 2015 Microchip Technology Inc.
DS30010089C-page 101
PIC24FJ256GA412/GB412 FAMILY
REGISTER 7-1:
RCON: RESET CONTROL REGISTER
R/W-0
R/W-0
TRAPR(1)
IOPUWR
U-0
(1)
R/W-0
—
RETEN
U-0
(2)
R/W-0
(1)
—
DPSLP
R/W-0
(1)
CM
R/W-0
PMSLP(3)
bit 15
bit 8
R/W-0
R/W-0
(1)
(1)
SWR
EXTR
R/W-0
R/W-0
(4)
SWDTEN
R/W-0
(1)
(1)
WDTO
SLEEP
R/W-0
R/W-1
R/W-1
(1)
(1)
POR(1)
IDLE
BOR
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
TRAPR: Trap Reset Flag bit(1)
1 = A Trap Conflict Reset has occurred
0 = A Trap Conflict Reset has not occurred
bit 14
IOPUWR: Illegal Opcode or Uninitialized W Access Reset Flag bit(1)
1 = An illegal opcode detection, an illegal address mode or Uninitialized W register is used as an
Address Pointer and caused a Reset
0 = An illegal opcode or Uninitialized W Register Reset has not occurred
bit 13
Unimplemented: Read as ‘0’
bit 12
RETEN: Retention Mode Enable bit(2)
1 = Retention mode is enabled while device is in Sleep modes (1.2V regulator supplies to the core)
0 = Retention mode is disabled; normal voltage levels are present
bit 11
Unimplemented: Read as ‘0’
bit 10
DPSLP: Deep Sleep Flag bit(1)
1 = Device has been in Deep Sleep mode
0 = Device has not been in Deep Sleep mode
bit 9
CM: Configuration Word Mismatch Reset Flag bit(1)
1 = A Configuration Word Mismatch Reset has occurred
0 = A Configuration Word Mismatch Reset has not occurred
bit 8
PMSLP: Program Memory Power During Sleep bit(3)
1 = Program memory bias voltage remains powered during Sleep
0 = Program memory bias voltage is powered down during Sleep
bit 7
EXTR: External Reset (MCLR) Pin bit(1)
1 = A Master Clear (pin) Reset has occurred
0 = A Master Clear (pin) Reset has not occurred
bit 6
SWR: Software Reset (Instruction) Flag bit(1)
1 = A RESET instruction has been executed
0 = A RESET instruction has not been executed
Note 1:
2:
3:
4:
All of the Reset status bits may be set or cleared in software. Setting one of these bits in software does not
cause a device Reset.
If the LPCFG Configuration bit is ‘1’ (unprogrammed), the retention regulator is disabled and the RETEN
bit has no effect.
Re-enabling the regulator after it enters Standby mode will add a delay, TVREG, when waking up from
Sleep. Applications that do not use the voltage regulator should set this bit to prevent this delay from
occurring.
If the FWDTEN Configuration bit is ‘1’ (unprogrammed), the WDT is always enabled, regardless of the
SWDTEN bit setting.
DS30010089C-page 102
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 7-1:
RCON: RESET CONTROL REGISTER (CONTINUED)
bit 5
SWDTEN: Software Enable/Disable of WDT bit(4)
1 = WDT is enabled
0 = WDT is disabled
bit 4
WDTO: Watchdog Timer Time-out Flag bit(1)
1 = WDT time-out has occurred
0 = WDT time-out has not occurred
bit 3
SLEEP: Wake from Sleep Flag bit(1)
1 = Device has been in Sleep mode
0 = Device has not been in Sleep mode
bit 2
IDLE: Wake-up from Idle Flag bit(1)
1 = Device has been in Idle mode
0 = Device has not been in Idle mode
bit 1
BOR: Brown-out Reset Flag bit(1)
1 = A Brown-out Reset has occurred (also set after a Power-on Reset).
0 = A Brown-out Reset has not occurred
bit 0
POR: Power-on Reset Flag bit(1)
1 = A Power-on Reset has occurred
0 = A Power-on Reset has not occurred
Note 1:
2:
3:
4:
All of the Reset status bits may be set or cleared in software. Setting one of these bits in software does not
cause a device Reset.
If the LPCFG Configuration bit is ‘1’ (unprogrammed), the retention regulator is disabled and the RETEN
bit has no effect.
Re-enabling the regulator after it enters Standby mode will add a delay, TVREG, when waking up from
Sleep. Applications that do not use the voltage regulator should set this bit to prevent this delay from
occurring.
If the FWDTEN Configuration bit is ‘1’ (unprogrammed), the WDT is always enabled, regardless of the
SWDTEN bit setting.
 2015 Microchip Technology Inc.
DS30010089C-page 103
PIC24FJ256GA412/GB412 FAMILY
REGISTER 7-2:
RCON2: RESET AND SYSTEM CONTROL REGISTER 2
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
U-0
U-0
—
U-0
—
r-0
—
—
R/CO-1
(1)
VDDBOR
R/CO-1
R/CO-1
(1,2)
VDDPOR
(1,3)
VBPOR
R/CO-0
VBAT(1)
bit 7
bit 0
Legend:
CO = Clearable Only bit
r = Reserved bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-5
x = Bit is unknown
Unimplemented: Read as ‘0’
bit 4
Reserved: Maintain as ‘0’
bit 3
VDDBOR: VDD Brown-out Reset Flag bit(1)
1 = A VDD Brown-out Reset has occurred (set by hardware)
0 = A VDD Brown-out Reset has not occurred
bit 2
VDDPOR: VDD Power-on Reset Flag bit(1,2)
1 = A VDD Power-on Reset has occurred (set by hardware)
0 = A VDD Power-on Reset has not occurred
bit 1
VBPOR: VBPOR Flag bit(1,3)
1 = A VBAT POR has occurred (no battery connected to VBAT pin or VBAT power below Deep Sleep
Semaphore register retention level is set by hardware)
0 = A VBAT POR has not occurred
bit 0
VBAT: VBAT Flag bit(1)
1 = A POR exit has occurred while power was applied to VBAT pin (set by hardware)
0 = A POR exit from VBAT has not occurred
Note 1:
2:
3:
This bit is set in hardware only; it can only be cleared in software.
This bit indicates a VDD Power-on Reset. Setting the POR bit (RCON<0>) indicates a VCORE Power-on Reset.
This bit is set when the device is originally powered up, even if power is present on VBAT.
TABLE 7-1:
RESET FLAG BIT OPERATION
Flag Bit
TRAPR (RCON<15>)
Setting Event
Trap Conflict Event
Clearing Event
POR
IOPUWR (RCON<14>) Illegal Opcode or Uninitialized W Register Access
POR
CM (RCON<9>)
Configuration Mismatch Reset
POR
EXTR (RCON<7>)
MCLR Reset
POR
SWR (RCON<6>)
RESET Instruction
WDTO (RCON<4>)
WDT Time-out
POR
CLRWDT, PWRSAV Instruction, POR
SLEEP (RCON<3>)
PWRSAV #0 Instruction
POR
DPSLP (RCON<10>)
PWRSAV #0 Instruction while DSEN bit is set
POR
POR
IDLE (RCON<2>)
PWRSAV #1 Instruction
BOR (RCON<1>)
POR, BOR
—
POR (RCON<0>)
POR
—
Note:
All Reset flag bits may be set or cleared by the user software.
DS30010089C-page 104
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
7.1
Special Function Register Reset
States
Most of the Special Function Registers (SFRs) associated with the PIC24F CPU and peripherals are reset to a
particular value at a device Reset. The SFRs are
grouped by their peripheral or CPU function and their
Reset values are specified in each section of this manual.
The Reset value for each SFR does not depend on the
type of Reset, with the exception of four registers. The
Reset value for the Reset Control register, RCON, will
depend on the type of device Reset. The Reset value
for the Oscillator Control register, OSCCON, will
depend on the type of Reset and the programmed
values of the FNOSC<2:0> bits in the Oscillator Select
Configuration Word (FOSCSEL) (see Table 7-2). The
NVMCON register is only affected by a POR.
7.2
Device Reset Times
The Reset times for various types of device Reset are
summarized in Table 7-3. Note that the Master Reset
Signal, SYSRST, is released after the POR delay time
expires.
The time at which the device actually begins to execute
code will also depend on the system oscillator delays,
which include the Oscillator Start-up Timer (OST) and
the PLL lock time. The OST and PLL lock times occur
in parallel with the applicable SYSRST delay times.
The Fail-Safe Clock Monitor (FSCM) delay determines
the time at which the FSCM begins to monitor the system
clock source after the SYSRST signal is released.
 2015 Microchip Technology Inc.
7.3
Brown-out Reset (BOR)
PIC24FJ256GA412/GB412 family devices implement
a BOR circuit that provides the user with several
configuration and power-saving options. The BOR is
controlled by the BOREN (FPOR<0>) Configuration
bit. When BOR is enabled, any drop of VDD below the
BOR trip point results in a device BOR. The BOR trip
point, VBOR, is characterized (Parameter DC17B) in
Section 36.1 “DC Characteristics”.
7.4
Clock Source Selection at Reset
If clock switching is enabled, the system clock source at
device Reset is chosen, as shown in Table 7-2. If clock
switching is disabled, the system clock source is always
selected according to the Oscillator Configuration bits. For
more information, refer to the “dsPIC33/PIC24 Family
Reference Manual”, “Oscillator” (DS39700).
TABLE 7-2:
Reset Type
POR
BOR
MCLR
WDTO
SWR
OSCILLATOR SELECTION vs.
TYPE OF RESET (CLOCK
SWITCHING ENABLED)
Clock Source Determinant
FNOSC<2:0> Configuration bits
(FOSCSEL<2:0>)
COSC<2:0> Control bits
(OSCCON<14:12>)
DS30010089C-page 105
PIC24FJ256GA412/GB412 FAMILY
TABLE 7-3:
RESET DELAY TIMES FOR VARIOUS DEVICE RESETS
SYSRST Delay
System Clock
Delay
EC
TPOR + TSTARTUP + TRST
—
ECPLL
TPOR + TSTARTUP + TRST
TLOCK
1, 2, 3, 5
XT, HS, SOSC
TPOR + TSTARTUP + TRST
TOST
1, 2, 3, 4
XTPLL, HSPLL
TPOR + TSTARTUP + TRST
TOST + TLOCK
1, 2, 3, 4, 5
FRC, FRCDIV
TPOR + TSTARTUP + TRST
TFRC
1, 2, 3, 6, 7
FRCPLL
TPOR + TSTARTUP + TRST
TFRC + TLOCK
1, 2, 3, 5, 6
LPRC
TPOR + TSTARTUP + TRST
TLPRC
Reset Type
POR
BOR
Clock Source
Notes
1, 2, 3
1, 2, 3, 6
EC
TSTARTUP + TRST
—
ECPLL
TSTARTUP + TRST
TLOCK
2, 3
2, 3, 5
XT, HS, SOSC
TSTARTUP + TRST
TOST
2, 3, 4
XTPLL, HSPLL
TSTARTUP + TRST
TOST + TLOCK
2, 3, 4, 5
FRC, FRCDIV
TSTARTUP + TRST
TFRC
2, 3, 6, 7
FRCPLL
TSTARTUP + TRST
TFRC + TLOCK
2, 3, 5, 6
LPRC
TSTARTUP + TRST
TLPRC
2, 3, 6
MCLR
Any Clock
TRST
—
3
WDT
Any Clock
TRST
—
3
Software
Any clock
TRST
—
3
Illegal Opcode
Any Clock
TRST
—
3
Uninitialized W
Any Clock
TRST
—
3
Trap Conflict
Any Clock
TRST
—
3
Note 1:
2:
3:
4:
5:
6:
7:
7.4.1
TPOR = Power-on Reset Delay (10 s nominal).
TSTARTUP = TVREG.
TRST = Internal State Reset Time (2 s nominal).
TOST = Oscillator Start-up Timer (OST). A 10-bit counter counts 1024 oscillator periods before releasing
the oscillator clock to the system.
TLOCK = PLL Lock Time.
TFRC and TLPRC = RC Oscillator Start-up Times.
If Two-Speed Start-up is enabled, regardless of the Primary Oscillator selected, the device starts with FRC
so the system clock delay is just TFRC, and in such cases, FRC start-up time is valid; it switches to the
Primary Oscillator after its respective clock delay.
POR AND LONG OSCILLATOR
START-UP TIMES
The oscillator start-up circuitry and its associated delay
timers are not linked to the device Reset delays that
occur at power-up. Some crystal circuits (especially
low-frequency crystals) will have a relatively long
start-up time. Therefore, one or more of the following
conditions is possible after SYSRST is released:
• The oscillator circuit has not begun to oscillate.
• The Oscillator Start-up Timer has not expired (if a
crystal oscillator is used).
• The PLL has not achieved a lock (if PLL is used).
DS30010089C-page 106
The device will not begin to execute code until a valid
clock source has been released to the system. Therefore, the oscillator and PLL start-up delays must be
considered when the Reset delay time must be known.
7.4.2
FAIL-SAFE CLOCK MONITOR
(FSCM) AND DEVICE RESETS
If the FSCM is enabled, it will begin to monitor the
system clock source when SYSRST is released. If a
valid clock source is not available at this time, the
device will automatically switch to the FRC Oscillator
and the user can switch to the desired crystal oscillator
in the Trap Service Routine (TSR).
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
8.0
Note:
INTERRUPT CONTROLLER
This data sheet summarizes the features
of this group of PIC24F devices. It is not
intended to be a comprehensive reference source. For more information, refer
to the “dsPIC33/PIC24 Family Reference
Manual”, “Interrupts” (DS70000600).
The information in this data sheet
supersedes the information in the FRM.
The PIC24F interrupt controller reduces the numerous
peripheral interrupt request signals to a single interrupt
request signal to the PIC24F CPU. It has the following
features:
•
•
•
•
Up to 8 Processor Exceptions and Software Traps
Seven User-Selectable Priority Levels
Interrupt Vector Table (IVT) with up to 118 Vectors
Unique Vector for Each Interrupt or Exception
Source
• Fixed Priority within a Specified User Priority
Level
• Alternate Interrupt Vector Table (AIVT) for Debug
Support
• Fixed Interrupt Entry and Return Latencies
8.1
Interrupt Vector Table
The Interrupt Vector Table (IVT) is shown in Figure 8-1.
The IVT resides in program memory, starting at location,
000004h. The IVT contains 126 vectors, consisting of
8 non-maskable trap vectors, plus up to 118 source
interrupts. In general, each interrupt source has its own
vector. Each interrupt vector contains a 24-bit wide
address. The value programmed into each interrupt vector location is the starting address of the associated
Interrupt Service Routine (ISR).
8.1.1
ALTERNATE INTERRUPT VECTOR
TABLE
The Alternate Interrupt Vector Table (AIVT) is located
after the IVT, as shown in Figure 8-1. The ALTIVT
(INTCON2<8>) control bit provides access to the AIVT.
If the ALTIVT bit is set, all interrupt and exception
processes will use the alternate vectors instead of the
default vectors. The alternate vectors are organized in
the same manner as the default vectors.
The AIVT supports emulation and debugging efforts by
providing a means to switch between an application,
and a support environment, without requiring the interrupt vectors to be reprogrammed. This feature also
enables switching between applications for evaluation
of different software algorithms at run time. If the AIVT
is not needed, the AIVT should be programmed with
the same addresses used in the IVT.
8.2
Reset Sequence
A device Reset is not a true exception because the
interrupt controller is not involved in the Reset process.
The PIC24F devices clear their registers in response to
a Reset, which forces the PC to zero. The microcontroller then begins program execution at location,
000000h. The user programs a GOTO instruction at the
Reset address, which redirects program execution to
the appropriate start-up routine.
Note:
Any unimplemented or unused vector
locations in the IVT and AIVT should be
programmed with the address of a default
interrupt handler routine that contains a
RESET instruction.
Interrupt vectors are prioritized in terms of their natural
priority; this is linked to their position in the vector table.
All other things being equal, lower addresses have a
higher natural priority. For example, the interrupt associated with Vector 0 will take priority over interrupts at
any other vector address.
PIC24FJ256GA412/GB412 family devices implement
non-maskable traps and unique interrupts. These are
summarized in Table 8-1 and Table 8-2.
 2015 Microchip Technology Inc.
DS30010089C-page 107
PIC24FJ256GA412/GB412 FAMILY
FIGURE 8-1:
PIC24F INTERRUPT VECTOR TABLES
Interrupt Vector Table (IVT)(1)
Decreasing Natural Order Priority
Reset – GOTO Instruction
Reset – GOTO Address
Oscillator Fail Trap Vector
Address Error Trap Vector
General Hard Trap Vector
Stack Error Trap Vector
Math Error Trap Vector
Reserved
General Soft Trap Vector
Reserved
Interrupt Vector 0
Interrupt Vector 1
—
—
Interrupt Vector 52
Interrupt Vector 53
Interrupt Vector 54
—
—
Interrupt Vector 116
Interrupt Vector 117
Legend:
Note 1:
2:
TABLE 8-1:
Alternate Interrupt Vector Table (AIVT)(1,2)
000000h
000002h
000004h
000014h
00007Ch
00007Eh
000080h
0000FCh
0000FEh
Reserved
Reserved
Oscillator Fail Trap Vector
Address Error Trap Vector
General Hard Trap Vector
Stack Error Trap Vector
Math Error Trap Vector
Reserved
General Soft Trap Vector
Reserved
Interrupt Vector 0
Interrupt Vector 1
—
—
Interrupt Vector 52
Interrupt Vector 53
Interrupt Vector 54
—
—
Interrupt Vector 116
Interrupt Vector 117
(Start of Code)
BOA+00h
BOA+02h
BOA+04h
BOA+14h
BOA+7Ch
BOA+7Eh
BOA+80h
BOA+FEh
(BOA+100h)
BOA: Base Offset Address for AIVT, which is the starting address of the last page of the Boot Segment.
All addresses are in hexadecimal.
See Table 8-2 for the interrupt vector list.
AIVT is only available when a Boot Segment is implemented.
TRAP VECTOR DETAILS
Vector Number
IVT Address
AIVT Address
Trap Source
0
000004h
BOA+04h
Oscillator Failure
1
000006h
BOA+06h
Address Error
2
000008h
BOA+08h
General Hardware Error
3
00000Ah
BOA+0Ah
Stack Error
4
00000Ch
BOA+0Ch
Math Error
5
00000Eh
BOA+0Eh
Reserved
6
000010h
BOA+10h
General Software Error
7
000012h
BOA+12h
Reserved
Legend: BOA = Base Offset Address for AIVT segment, which is the starting address of the last page of the
Boot Segment.
DS30010089C-page 108
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
TABLE 8-2:
IMPLEMENTED INTERRUPT VECTORS
Interrupt Bit Locations
Vector
Number
IRQ #
IVT
Address
Flag
Enable
Priority
ADC1 Interrupt
21
13
00002Eh
IFS0<13>
IEC0<13>
IPC3<6:4>
CLC1
104
96
0000D4h
IFS6<0>
IEC6<0>
IPC24<2:0>
CLC2
105
97
0000D6h
IFS6<1>
IEC6<1>
IPC24<6:4>
CLC3
106
98
0000D8h
IFS6<2>
IEC6<2>
IPC24<10:8>
CLC4
107
99
0000DAh
IFS6<3>
IEC6<3>
IPC24<14:12>
Interrupt Source
Comparator Event
26
18
000038h
IFS1<2>
IEC1<2>
IPC4<10:8>
CRC Generator
75
67
00009Ah
IFS4<3>
IEC4<3>
IPC16<14:12>
Crypto Buffer Ready
42
34
000058h
IFS2<2>
IEC2<2>
IPC8<10:8>
Crypto Operation Done
63
55
000082h
IFS3<7>
IEC3<7>
IPC13<14:12>
Crypto Key Store Program Done
64
56
000084h
IFS3<8>
IEC3<8>
IPC14<2:0>
Crypto Rollover
43
35
00005Ah
IFS2<3>
IEC2<3>
IPC8<14:12>
CTMU Event
85
77
0000AEh
IFS4<13>
IEC4<13>
IPC19<6:4>
DAC
86
78
0000B0h
IFS4<14>
IEC4<14>
IPC19<10:8>
DMA Channel 0
12
4
00001Ch
IFS0<4>
IEC0<4>
IPC1<2:0>
DMA Channel 1
22
14
000030h
IFS0<14>
IEC0<14>
IPC3<10:8>
DMA Channel 2
32
24
000044h
IFS1<8>
IEC1<8>
IPC6<2:0>
DMA Channel 3
44
36
00005Ch
IFS2<4>
IEC2<4>
IPC9<2:0>
DMA Channel 4
54
46
000070h
IFS2<14>
IEC2<14>
IPC11<10:8>
DMA Channel 5
69
61
00008Eh
IFS3<13>
IEC3<13>
IPC15<6:4>
Enhanced Parallel Master Port (EPMP)
53
45
00006Eh
IFS2<13>
IEC2<13>
IPC11<6:4>
External Interrupt 0
8
0
000014h
IFS0<0>
IEC0<0>
IPC0<2:0>
External Interrupt 1
28
20
00003Ch
IFS1<4>
IEC1<4>
IPC5<2:0>
External Interrupt 2
37
29
00004Eh
IFS1<13>
IEC1<13>
IPC7<6:4>
External Interrupt 3
61
53
00007Eh
IFS3<5>
IEC3<5>
IPC13<6:4>
External Interrupt 4
62
54
000080h
IFS3<6>
IEC3<6>
IPC13<10:8>
Flash Write/Program Done
23
15
000032h
IFS0<15>
IEC0<15>
IPC3<14:12>
FRC Self-Tune
114
106
0000E8h
IFS6<10>
IEC6<10>
IPC26<10:8>
High/Low-Voltage Detect (HLVD)
80
72
0000A4h
IFS4<8>
IEC4<8>
IPC18<2:0>
I2C1 Bus Collision
92
84
0000BCh
IFS5<4>
IEC5<4>
IPC21<2:0>
I2C1 Master Event
25
17
000036h
IFS1<1>
IEC1<1>
IPC4<6:4>
I2C1 Slave Event
24
16
000034h
IFS1<0>
IEC1<0>
IPC4<2:0>
I2C2 Bus Collision
93
85
0000BEh
IFS5<5>
IEC5<5>
IPC21<6:4>
I2C2 Master Event
58
50
000078h
IFS3<2>
IEC3<2>
IPC12<10:8>
I2C2 Slave Event
57
49
000076h
IFS3<1>
IEC3<1>
IPC12<6:4>
I2C3 Master Event
79
71
0000A2h
IFS4<7>
IEC4<7>
IPC17<14:12>
I2C3 Slave Event
78
70
0000A0h
IFS4<6>
IEC4<6>
IPC17<10:8>
IC23 Collision
117
109
0000EEh
IFS6<13>
IEC6<13>
IPC27<6:4>
Input Capture 1
9
1
000016h
IFS0<1>
IEC0<1>
IPC0<6:4>
Input Capture 2
13
5
00001Eh
IFS0<5>
IEC0<5>
IPC1<6:4>
Input Capture 3
45
37
00005Eh
IFS2<5>
IEC2<5>
IPC9<6:4>
Input Capture 4
46
38
000060h
IFS2<6>
IEC2<6>
IPC9<10:8>
Input Capture 5
47
39
000062h
IFS2<7>
IEC2<7>
IPC9<14:12>
Input Capture 6
48
40
000064h
IFS2<8>
IEC2<8>
IPC10<2:0>
Interrupt-On-Change (IOC)
27
19
00003Ah
IFS1<3>
IEC1<3>
IPC4<14:12>
JTAG
125
117
0000FEh
IFS7<5>
IEC7<5>
IPC29<6:4>
LCD
108
100
0000DCh
IFS6<4>
IEC6<4>
IPC25<2:0>
 2015 Microchip Technology Inc.
DS30010089C-page 109
PIC24FJ256GA412/GB412 FAMILY
TABLE 8-2:
IMPLEMENTED INTERRUPT VECTORS (CONTINUED)
Interrupt Bit Locations
Vector
Number
IRQ #
IVT
Address
Flag
Enable
Priority
MCCP1 Capture/Compare
71
63
000092h
IFS3<15>
IEC3<15>
IPC15<14:12>
MCCP1 Timer
109
101
0000DEh
IFS6<5>
IEC6<5>
IPC25<6:4>
MCCP2 Capture/Compare
72
64
000094h
IFS4<0>
IEC4<0>
IPC16<2:0>
MCCP2 Timer
110
102
0000E0h
IFS6<6>
IEC6<6>
IPC25<10:8>
MCCP3 Capture/Compare
102
94
0000D0h
IFS5<14>
IEC5<14>
IPC23<10:8>
MCCP3 Timer
51
43
00006Ah
IFS2<11>
IEC2<11>
IPC10<14:12>
MCCP4 Capture/Compare
103
95
0000D2h
IFS5<15>
IEC5<15>
IPC23<14:12>
MCCP4 Timer
52
44
00006Ch
IFS2<12>
IEC2<12>
IPC11<2:0>
Output Compare 1
10
2
000018h
IFS0<2>
IEC0<2>
IPC0<10:8>
Output Compare 2
14
6
000020h
IFS0<6>
IEC0<6>
IPC1<10:8>
Output Compare 3
33
25
000046h
IFS1<9>
IEC1<9>
IPC6<6:4>
Output Compare 4
34
26
000048h
IFS1<10>
IEC1<10>
IPC6<10:8>
Output Compare 5
49
41
000066h
IFS2<9>
IEC2<9>
IPC10<6:4>
Output Compare 6
50
42
000068h
IFS2<10>
IEC2<10>
IPC10<10:8>
Real-Time Clock and Calendar (RTCC)
70
62
000090h
IFS3<14>
IEC3<14>
IPC15<10:8>
RTCC Timestamp
118
110
0000F0h
IFS6<14>
IEC6<14>
IPC27<10:8>
SCCP5 Capture/Compare
30
22
000040h
IFS1<6>
IEC1<6>
IPC5<10:8>
SCCP6 Capture/Compare
31
23
000042h
IFS1<7>
IEC1<7>
IPC5<14:12>
SCCP7 Capture/Compare
81
73
0000A6h
IFS4<9>
IEC4<9>
IPC18<6:4>
SCCP5 Timer
55
47
000072h
IFS2<15>
IEC2<15>
IPC11<14:12>
SCCP6 Timer
56
48
000074h
IFS3<0>
IEC3<0>
IPC12<2:0>
SCCP7 Timer
59
51
00007Ah
IFS3<3>
IEC3<3>
IPC12<14:12>
SPI1 General
17
9
000026h
IFS0<9>
IEC0<9>
IPC2<6:4>
SPI1 Receive
66
58
000088h
IFS3<10>
IEC3<10>
IPC14<10:8>
SPI1 Transmit
18
10
000028h
IFS0<10>
IEC0<10>
IPC2<10:8>
SPI2 General
40
32
000054h
IFS2<0>
IEC2<0>
IPC8<2:0>
SPI2 Receive
67
59
00008Ah
IFS3<11>
IEC3<11>
IPC14<14:12>
SPI2 Transmit
41
33
000056h
IFS2<1>
IEC2<1>
IPC8<6:4>
SPI3 General
98
90
0000C8h
IFS5<10>
IEC5<10>
IPC22<10:8>
Interrupt Source
SPI3 Receive
68
60
00008Ch
IFS3<12>
IEC3<12>
IPC15<2:0>
SPI3 Transmit
99
91
0000CAh
IFS5<11>
IEC5<11>
IPC22<14:12>
SPI3 Transmit
101
93
0000CEh
IFS5<13>
IEC5<13>
IPC23<6:4>
SPI4 General
100
92
0000CCh
IFS5<12>
IEC5<12>
IPC23<2:0>
SPI4 Receive
65
57
000086h
IFS3<9>
IEC3<9>
IPC14<6:4>
Timer1
11
3
00001Ah
IFS0<3>
IEC0<3>
IPC0<14:12>
Timer2
15
7
000022h
IFS0<7>
IEC0<7>
IPC1<14:12>
Timer3
16
8
000024h
IFS0<8>
IEC0<8>
IPC2<2:0>
Timer4
35
27
00004Ah
IFS1<11>
IEC1<11>
IPC6<14:12>
Timer5
36
28
00004Ch
IFS1<12>
IEC1<12>
IPC7<2:0>
UART1 Error
73
65
000096h
IFS4<1>
IEC4<1>
IPC16<6:4>
UART1 Receiver
19
11
00002Ah
IFS0<11>
IEC0<11>
IPC2<14:12>
UART1 Transmitter
20
12
00002Ch
IFS0<12>
IEC0<12>
IPC3<2:0>
UART2 Error
74
66
000098h
IFS4<2>
IEC4<2>
IPC16<10:8>
UART2 Receiver
38
30
000050h
IFS1<14>
IEC1<14>
IPC7<10:8>
UART2 Transmitter
39
31
000052h
IFS1<15>
IEC1<15>
IPC7<14:12>
DS30010089C-page 110
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
TABLE 8-2:
IMPLEMENTED INTERRUPT VECTORS (CONTINUED)
Interrupt Source
UART3 Error
Interrupt Bit Locations
Vector
Number
IRQ #
IVT
Address
Flag
Enable
Priority
89
81
0000B6h
IFS5<1>
IEC5<1>
IPC20<6:4>
UART3 Receiver
90
82
0000B8h
IFS5<2>
IEC5<2>
IPC20<10:8>
UART3 Transmitter
91
83
0000BAh
IFS5<3>
IEC5<3>
IPC20<14:12>
UART4 Error
95
87
0000C2h
IFS5<7>
IEC5<7>
IPC21<14:12>
UART4 Receiver
96
88
0000C4h
IFS5<8>
IEC5<8>
IPC22<2:0>
IPC22<6:4>
UART4 Transmitter
97
89
0000C6h
IFS5<9>
IEC5<9>
UART5 Error
121
113
0000F6h
IFS7<1>
IEC7<1>
IPC28<6:4>
UART5 Receive
119
111
0000F2h
IFS6<15>
IEC6<15>
IPC27<14:12>
UART5 Transmit
120
112
0000F4h
IFS7<0>
IEC7<0>
IPC28<2:0>
UART6 Error
124
116
0000FCh
IFS7<4>
IEC7<4>
IPC29<2:0>
UART6 Receive
122
114
0000F8h
IFS7<2>
IEC7<2>
IPC28<10:8>
UART6 Transmit
123
113
0000FAh
IFS7<3>
IEC7<3>
IPC28<14:12>
USB
94
86
0000C0h
IFS5<6>
IEC5<6>
IPC21<10:8>
 2015 Microchip Technology Inc.
DS30010089C-page 111
PIC24FJ256GA412/GB412 FAMILY
8.3
Interrupt Control and Status
Registers
The PIC24FJ256GA412/GB412 family of devices
implements a total of 50 registers for the interrupt
controller:
•
•
•
•
•
•
•
INTCON1
INTCON2
INTCON4
IFS0 through IFS7
IEC0 through IEC7
IPC0 through ICP29
INTTREG
Global interrupt control functions are controlled from
INTCON1 and INTCON2. INTCON1 contains the Interrupt Nesting Disable (NSTDIS) bit, as well as the
control and status flags for the processor trap sources.
The INTCON2 register controls global interrupt generation, the external interrupt request signal behavior and
the use of the Alternate Interrupt Vector Table (AIVT).
INTCON2 and INTCON4 also contain status flags for
various hardware trap events.
The IFSx registers maintain all of the interrupt request
flags. Each source of interrupt has a status bit, which is
set by the respective peripherals or an external signal
and is cleared via software.
The IECx registers maintain all of the interrupt enable
bits. These control bits are used to individually enable
interrupts from the peripherals or external signals.
The IPCx registers are used to set the Interrupt Priority
Level (IPL) for each source of interrupt. Each user
interrupt source can be assigned to one of eight priority
levels.
The interrupt sources are assigned to the IFSx, IECx
and IPCx registers in the order of their vector numbers,
as shown in Table 8-2. For example, the INT0 (External
Interrupt 0) is shown as having a vector number and a
natural order priority of 0. Thus, the INT0IF status bit is
found in IFS0<0>, the INT0IE enable bit in IEC0<0>
and the INT0IP<2:0> priority bits in the first position of
IPC0 (IPC0<2:0>).
Although they are not specifically part of the interrupt
control hardware, two of the CPU Control registers contain bits that control interrupt functionality. The ALU
STATUS Register (SR) contains the IPL<2:0> bits
(SR<7:5>). These indicate the current CPU Interrupt
Priority Level. The user can change the current CPU
priority level by writing to the IPLx bits.
The CORCON register contains the IPL3 bit, which
together with the IPL<2:0> bits, indicates the current
CPU priority level. IPL3 is a read-only bit so that trap
events cannot be masked by the user software.
The interrupt controller has the Interrupt Controller Test
register, INTTREG, which displays the status of the
interrupt controller. When an interrupt request occurs,
its associated vector number and the new Interrupt Priority Level are latched into INTTREG. This information
can be used to determine a specific interrupt source if
a generic ISR is used for multiple vectors (such as
when ISR remapping is used in bootloader applications) or to check if another interrupt is pending while in
an ISR.
All Interrupt registers are described in Register 8-3
through Register 8-52 in the succeeding pages.
The INTTREG register contains the associated
interrupt vector number and the new CPU Interrupt
Priority Level, which are latched into the Vector
Number (VECNUM<6:0>) and the Interrupt Priority
Level (ILR<3:0>) bit fields in the INTTREG register.
The new Interrupt Priority Level is the priority of the
pending interrupt.
DS30010089C-page 112
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-1:
SR: ALU STATUS REGISTER (IN CPU)
U-0
U-0
U-0
U-0
U-0
U-0
U-0
R/W-0
—
—
—
—
—
—
—
DC(1)
bit 15
bit 8
R/W-0
IPL2
(2,3)
R/W-0
R/W-0
R-0
R/W-0
R/W-0
R/W-0
R/W-0
IPL1(2,3)
IPL0(2,3)
RA(1)
N(1)
OV(1)
Z(1)
C(1)
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-9
Unimplemented: Read as ‘0’
bit 7-5
IPL<2:0>: CPU Interrupt Priority Level Status bits(2,3)
111 = CPU Interrupt Priority Level is 7 (15); user interrupts are disabled
110 = CPU Interrupt Priority Level is 6 (14)
101 = CPU Interrupt Priority Level is 5 (13)
100 = CPU Interrupt Priority Level is 4 (12)
011 = CPU Interrupt Priority Level is 3 (11)
010 = CPU Interrupt Priority Level is 2 (10)
001 = CPU Interrupt Priority Level is 1 (9)
000 = CPU Interrupt Priority Level is 0 (8)
Note 1:
2:
3:
x = Bit is unknown
See Register 3-1 for the description of the remaining bits (bits 8, 4, 3, 2, 1 and 0) that are not dedicated to
interrupt control functions.
The IPLx bits are concatenated with the IPL3 (CORCON<3>) bit to form the CPU Interrupt Priority Level.
The value in parentheses indicates the Interrupt Priority Level if IPL3 = 1.
The IPLx Status bits are read-only when NSTDIS (INTCON1<15>) = 1.
 2015 Microchip Technology Inc.
DS30010089C-page 113
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-2:
CORCON: CPU CONTROL REGISTER
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
U-0
U-0
—
—
U-0
—
U-0
—
R/C-0
r-1
U-0
U-0
(1)
—
—
—
IPL3
bit 7
bit 0
Legend:
r = Reserved bit
C = Clearable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-4
Unimplemented: Read as ‘0’
bit 3
IPL3: CPU Interrupt Priority Level Status bit(1)
1 = CPU Interrupt Priority Level is greater than 7
0 = CPU Interrupt Priority Level is 7 or less
bit 2
Reserved: Read as ‘1’
bit 1-0
Unimplemented: Read as ‘0’
Note 1:
x = Bit is unknown
The IPL3 bit is concatenated with the IPL<2:0> bits (SR<7:5>) to form the CPU Interrupt Priority Level;
see Register 3-2 for bit description.
DS30010089C-page 114
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-3:
INTCON1: INTERRUPT CONTROL REGISTER 1
R/W-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
NSTDIS
—
—
—
—
—
—
—
bit 15
bit 8
U-0
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
U-0
—
—
—
MATHERR
ADDRERR
STKERR
OSCFAIL
—
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
NSTDIS: Interrupt Nesting Disable bit
1 = Interrupt nesting is disabled
0 = Interrupt nesting is enabled
bit 14-5
Unimplemented: Read as ‘0’
bit 4
MATHERR: Arithmetic Error Trap Status bit
1 = Overflow trap has occurred
0 = Overflow trap has not occurred
bit 3
ADDRERR: Address Error Trap Status bit
1 = Address error trap has occurred
0 = Address error trap has not occurred
bit 2
STKERR: Stack Error Trap Status bit
1 = Stack error trap has occurred
0 = Stack error trap has not occurred
bit 1
OSCFAIL: Oscillator Failure Trap Status bit
1 = Oscillator failure trap has occurred
0 = Oscillator failure trap has not occurred
bit 0
Unimplemented: Read as ‘0’
 2015 Microchip Technology Inc.
x = Bit is unknown
DS30010089C-page 115
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-4:
INTCON2: INTERRUPT CONTROL REGISTER 2
R/W-0
R-0, HSC
R/W-0
U-0
U-0
U-0
U-0
R/W-0
GIE
DISI
SWTRAP
—
—
—
—
ALTIVT
bit 15
bit 8
U-0
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
—
INT4EP
INT3EP
INT2EP
INT1EP
INT0EP
bit 7
bit 0
Legend:
HSC = Hardware Settable/Clearable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
GIE: Global Interrupt Enable bit
1 = Interrupt and associated interrupt enable bits are enabled
0 = Interrupts are disabled; traps remain enabled
bit 14
DISI: DISI Instruction Status bit
1 = DISI instruction is active
0 = DISI instruction is not active
bit 13
SWTRAP: Software Trap Status bit
1 = Generates a software trap
0 = Software trap is not requested
bit 12-9
Unimplemented: Read as ‘0’
bit 8
ALTIVT: Enable Alternate Interrupt Vector Table bit
1 = Uses Alternate Interrupt Vector Table
0 = Uses standard (default) Interrupt Vector Table
bit 7-5
Unimplemented: Read as ‘0’
bit 4
INT4EP: External Interrupt 4 Edge Detect Polarity Select bit
1 = Interrupt on negative edge
0 = Interrupt on positive edge
bit 3
INT3EP: External Interrupt 3 Edge Detect Polarity Select bit
1 = Interrupt on negative edge
0 = Interrupt on positive edge
bit 2
INT2EP: External Interrupt 2 Edge Detect Polarity Select bit
1 = Interrupt on negative edge
0 = Interrupt on positive edge
bit 1
INT1EP: External Interrupt 1 Edge Detect Polarity Select bit
1 = Interrupt on negative edge
0 = Interrupt on positive edge
bit 0
INT0EP: External Interrupt 0 Edge Detect Polarity Select bit
1 = Interrupt on negative edge
0 = Interrupt on positive edge
DS30010089C-page 116
x = Bit is unknown
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-5:
INTCON4: INTERRUPT CONTROL REGISTER 4
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
U-0
U-0
U-0
U-0
U-0
U-0
U-0
R/W-0, HSC
—
—
—
—
—
—
—
SGHT
bit 7
bit 0
Legend:
HSC = Hardware Settable/Clearable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-1
Unimplemented: Read as ‘0’
bit 0
SGHT: Software Generated Hard Trap Status bit
1 = A software generated hard trap has occurred
0 = No software generated hard trap has occurred
 2015 Microchip Technology Inc.
x = Bit is unknown
DS30010089C-page 117
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-6:
IFS0: INTERRUPT FLAG STATUS REGISTER 0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
NVMIF
DMA1IF
AD1IF
U1TXIF
U1RXIF
SPI1TXIF
SPI1IF
T3IF
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0,
R/W-0
R/W-0
T2IF
OC2IF
IC2IF
DMA0IF
T1IF
OC1IF
IC1IF
INT0IF
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
NVMIF: Flash Memory Write/Program Done Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 14
DMA1IF: DMA Channel 1 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 13
AD1IF: 12-Bit Pipeline A/D Event Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 12
U1TXIF: UART1 Transmitter Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 11
U1RXIF: UART1 Receiver Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 10
SPI1TXIF: SPI1 Transmit Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 9
SPI1IF: SPI1 General Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 8
T3IF: Timer3 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 7
T2IF: Timer2 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 6
OC2IF: Output Compare Channel 2 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 5
IC2IF: Input Capture Channel 2 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 4
DMA0IF: DMA Channel 0 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
DS30010089C-page 118
x = Bit is unknown
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-6:
IFS0: INTERRUPT FLAG STATUS REGISTER 0 (CONTINUED)
bit 3
T1IF: Timer1 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 2
OC1IF: Output Compare Channel 1 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 1
IC1IF: Input Capture Channel 1 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 0
INT0IF: External Interrupt 0 Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
 2015 Microchip Technology Inc.
DS30010089C-page 119
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-7:
IFS1: INTERRUPT FLAG STATUS REGISTER 1
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
U2TXIF
U2RXIF
INT2IF
T5IF
T4IF
OC4IF
OC3IF
DMA2IF
bit 15
bit 8
R/W-0
R/W-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
CCP6IF
CCP5IF
—
INT1IF
CNIF
CMIF
MI2C1IF
SI2C1IF
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
U2TXIF: UART2 Transmitter Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 14
U2RXIF: UART2 Receiver Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 13
INT2IF: External Interrupt 2 Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 12
T5IF: Timer5 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 11
T4IF: Timer4 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 10
OC4IF: Output Compare Channel 4 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 9
OC3IF: Output Compare Channel 3 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 8
DMA2IF: DMA Channel 2 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 7
CCP6IF: SCCP6 Capture/Compare Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 6
CCP5IF: SCCP5 Capture/Compare Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 5
Unimplemented: Read as ‘0’
bit 4
INT1IF: External Interrupt 1 Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 3
CNIF: Interrupt-On-Change Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
DS30010089C-page 120
x = Bit is unknown
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-7:
IFS1: INTERRUPT FLAG STATUS REGISTER 1 (CONTINUED)
bit 2
CMIF: Comparator Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 1
MI2C1IF: Master I2C1 Event Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 0
SI2C1IF: Slave I2C1 Event Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
 2015 Microchip Technology Inc.
DS30010089C-page 121
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-8:
IFS2: INTERRUPT FLAG STATUS REGISTER 2
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
CCT5IF
DMA4IF
PMPIF
CCT4IF
CCT3IF
OC6IF
OC5IF
IC6IF
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
IC5IF
IC4IF
IC3IF
DMA3IF
R/W-0
R/W-0
CRYROLLIF CRYFREEIF
R/W-0
R/W-0
SPI2TXIF
SPI2IF
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
CCT5IF: SCCP5 Timer Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 14
DMA4IF: DMA Channel 4 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 13
PMPIF: Parallel Master Port Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 12
CCT4IF: SCCP4 Timer Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 11
CCT3IF: MCCP3 Timer Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 10
OC6IF: Output Compare Channel 6 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 9
OC5IF: Output Compare Channel 5 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 8
IC6IF: Input Capture Channel 6 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 7
IC5IF: Input Capture Channel 5 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 6
IC4IF: Input Capture Channel 4 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 5
IC3IF: Input Capture Channel 3 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 4
DMA3IF: DMA Channel 3 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
DS30010089C-page 122
x = Bit is unknown
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-8:
IFS2: INTERRUPT FLAG STATUS REGISTER 2 (CONTINUED)
bit 3
CRYROLLIF: Cryptographic Rollover Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 2
CRYFREEIF: Cryptographic Buffer Free Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 1
SPI2TXIF: SPI2 Transmit Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 0
SPI2IF: SPI2 General Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
 2015 Microchip Technology Inc.
DS30010089C-page 123
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-9:
IFS3: INTERRUPT FLAG STATUS REGISTER 3
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
CCP1IF
RTCIF
DMA5IF
SPI3RXIF
SPI2RXIF
SPI1RXIF
SPI4RXIF
KEYSTRIF
bit 15
bit 8
R/W-0
R/W-0
R/W-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
CRYDNIF
INT4IF
INT3IF
—
CCT7IF
MI2C2IF
SI2C2IF
CCT6IF
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
CCP1IF: MCCP1 Capture/Compare Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 14
RTCIF: Real-Time Clock and Calendar Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 13
DMA5IF: DMA Channel 5 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 12
SPI3RXIF: SPI3 Receive Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 11
SPI2RXIF: SPI2 Receive Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 10
SPI1RXIF: SPI1 Receive Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 9
SPI4RXIF: SPI4 Receive Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 8
KEYSTRIF: Cryptographic Key Store Program Done Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 7
CRYDNIF: Cryptographic Operation Done Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 6
INT4IF: External Interrupt 4 Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 5
INT3IF: External Interrupt 3 Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 4
Unimplemented: Read as ‘0’
bit 3
CCT7IF: SCCP7 Timer Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
DS30010089C-page 124
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-9:
IFS3: INTERRUPT FLAG STATUS REGISTER 3 (CONTINUED)
bit 2
MI2C2IF: Master I2C2 Event Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 1
SI2C2IF: Slave I2C2 Event Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 0
CCT6IF: SCCP6 Timer Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
 2015 Microchip Technology Inc.
DS30010089C-page 125
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-10:
IFS4: INTERRUPT FLAG STATUS REGISTER 4
U-0
R/W-0
R/W-0
U-0
U-0
U-0
R/W-0
R/W-0
—
DAC1IF
CTMUIF
—
—
—
CCP7IF
HLVDIF
bit 15
bit 8
R/W-0
R/W-0
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
MI2C3IF
SI2C3IF
—
—
CRCIF
U2ERIF
U1ERIF
CCP2IF
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
Unimplemented: Read as ‘0’
bit 14
DAC1IF: DAC Converter Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 13
CTMUIF: CTMU Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 12-10
Unimplemented: Read as ‘0’
bit 9
CCP7IF: SCCP7 Capture/Compare Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 8
HLVDIF: High/Low-Voltage Detect Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 7
MI2C3IF: Master I2C3 Event Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 6
SI2C3IF: Slave I2C3 Event Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 5-4
Unimplemented: Read as ‘0’
bit 3
CRCIF: CRC Generator Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 2
U2ERIF: UART2 Error Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 1
U1ERIF: UART1 Error Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 0
CCP2IF: MCCP2 Capture/Compare Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
DS30010089C-page 126
x = Bit is unknown
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-11:
IFS5: INTERRUPT FLAG STATUS REGISTER 5
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
CCP4IF
CCP3IF
SPI4TXIF
SPI4IF
SPI3TXIF
SPI3IF
U4TXIF
U4RXIF
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
U-0
U4ERIF
USB1IF
I2C2BCIF
I2C1BCIF
U3TXIF
U3RXIF
U3ERIF
—
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
CCP4IF: SCCP4 Capture/Compare Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 14
CCP3IF: MCCP3 Capture/Compare Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 13
SPI4TXIF: SPI4 Transmit Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 12
SPI4IF: SPI4 General Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 11
SPI3TXIF: SPI3 Transmit Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 10
SPI3IF: SPI3 General Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 9
U4TXIF: UART4 Transmitter Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 8
U4RXIF: UART4 Receiver Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 7
U4ERIF: UART4 Error Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 6
USB1IF: USB1 (USB OTG) Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 5
I2C2BCIF: I2C2 Bus Collision Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 4
I2C1BCIF: I2C1 Bus Collision Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
 2015 Microchip Technology Inc.
x = Bit is unknown
DS30010089C-page 127
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-11:
IFS5: INTERRUPT FLAG STATUS REGISTER 5 (CONTINUED)
bit 3
U3TXIF: UART3 Transmitter Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 2
U3RXIF: UART3 Receiver Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 1
U3ERIF: UART3 Error Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 0
Unimplemented: Read as ‘0’
DS30010089C-page 128
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-12:
R/W-0
U5RXIF
IFS6: INTERRUPT FLAG STATUS REGISTER 6
R/W-0
RTCTSIF
R/W-0
U-0
U-0
R/W-0
U-0
U-0
I2C3BCIF
—
—
FSTIF
—
—
bit 15
bit 8
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
CCT2IF
CCT1IF
LCDIF
CLC4IF
CLC3IF
CLC2IF
CLC1IF
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
U5RXIF: UART5 Receiver Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 14
RTCTSIF: RTCC Timestamp Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 13
I2C3BCIF: I2C3 Bus Collision Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 12-11
Unimplemented: Read as ‘0’
bit 10
FSTIF: FRC Self-Tune Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 9-7
Unimplemented: Read as ‘0’
bit 6
CCT2IF: MCCP2 Timer Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 5
CCT1IF: MCCP1 Timer Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 4
LCDIF: LCD Controller Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 3
CLC4IF: CLC4 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 2
CLC3IF: CLC3 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 1
CLC2IF: CLC2 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 0
CLC1IF: CLC1 Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
 2015 Microchip Technology Inc.
x = Bit is unknown
DS30010089C-page 129
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-13:
IFS7: INTERRUPT FLAG STATUS REGISTER 7
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
JTAGIF
U6ERIF
U6TXIF
U6RXIF
U5ERIF
U5TXIF
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-6
Unimplemented: Read as ‘0’
bit 5
JTAGIF: JTAG Controller Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 4
U6ERIF: UART6 Error Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 3
U6TXIF: UART6 Transmitter Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 2
U6RXIF: UART6 Receiver Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 1
U5ERIF: UART5 Error Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 0
U5TXIF: UART5 Transmitter Interrupt Flag Status bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
DS30010089C-page 130
x = Bit is unknown
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-14:
IEC0: INTERRUPT ENABLE CONTROL REGISTER 0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
NVMIE
DMA1IE
AD1IE
U1TXIE
U1RXIE
SPI1TXIE
SPI1IE
T3IE
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0,
R/W-0
R/W-0
T2IE
OC2IE
IC2IE
DMA0IE
T1IE
OC1IE
IC1IE
INT0IE
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
NVMIE: Flash Memory Write/Program Done Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 14
DMA1IE: DMA Channel 1 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 13
AD1IE: 12-Bit Pipeline A/D Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 12
U1TXIE: UART1 Transmitter Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 11
U1RXIE: UART1 Receiver Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 10
SPI1TXIE: SPI1 Transmit Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 9
SPI1IE: SPI1 General Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 8
T3IE: Timer3 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 7
T2IE: Timer2 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 6
OC2IE: Output Compare Channel 2 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 5
IC2IE: Input Capture Channel 2 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 4
DMA0IE: DMA Channel 0 Interrupt Flag Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
 2015 Microchip Technology Inc.
x = Bit is unknown
DS30010089C-page 131
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-14:
IEC0: INTERRUPT ENABLE CONTROL REGISTER 0 (CONTINUED)
bit 3
T1IE: Timer1 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 2
OC1IE: Output Compare Channel 1 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 1
IC1IE: Input Capture Channel 1 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 0
INT0IE: External Interrupt 0 Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
DS30010089C-page 132
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-15:
R/W-0
U2TXIE
IEC1: INTERRUPT ENABLE CONTROL REGISTER 1
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
U2RXIE
INT2IE(1)
T5IE
T4IE
OC4IE
OC3IE
DMA2IE
bit 15
bit 8
R/W-0
R/W-0
CCP6IE
U-0
—
CCP5IE
R/W-0
(1)
INT1IE
R/W-0
R/W-0
R/W-0
R/W-0
CNIE
CMIE
MI2C1IE
SI2C1IE
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
U2TXIE: UART2 Transmitter Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 14
U2RXIE: UART2 Receiver Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 13
INT2IE: External Interrupt 2 Enable bit(1)
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 12
T5IE: Timer5 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 11
T4IE: Timer4 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 10
OC4IE: Output Compare Channel 4 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 9
OC3IE: Output Compare Channel 3 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 8
DMA2IE: DMA Channel 2 Interrupt Flag Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 7
CCP6IE: SCCP6 Capture/Compare Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 6
CCP5IE: SCCP5 Capture/Compare Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 5
Unimplemented: Read as ‘0’
bit 4
INT1IE: External Interrupt 1 Enable bit(1)
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
Note 1:
x = Bit is unknown
If an external interrupt is enabled, the interrupt input must also be configured to an available RPn or RPIn
pin. See Section 11.4 “Peripheral Pin Select (PPS)” for more information.
 2015 Microchip Technology Inc.
DS30010089C-page 133
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-15:
IEC1: INTERRUPT ENABLE CONTROL REGISTER 1 (CONTINUED)
bit 3
CNIE: Input Change Notification Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 2
CMIE: Comparator Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 1
MI2C1IE: Master I2C1 Event Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 0
SI2C1IE: Slave I2C1 Event Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
Note 1:
If an external interrupt is enabled, the interrupt input must also be configured to an available RPn or RPIn
pin. See Section 11.4 “Peripheral Pin Select (PPS)” for more information.
DS30010089C-page 134
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-16:
IEC2: INTERRUPT ENABLE CONTROL REGISTER 2
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
CCT5IE
DMA4IE
PMPIE
CCT4IE
CCT3IE
OC6IE
OC5IE
IC6IE
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
IC5IE
IC4IFE
IC3IE
DMA3IFE
R/W-0
R/W-0
CRYROLLIFE CRYFREEIE
R/W-0
R/W-0
SPI2TXIE
SPI2IE
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
CCT5IE: SCCP5 Timer Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 14
DMA4IE: DMA Channel 4 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 13
PMPIE: Parallel Master Port Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 12
CCT4IE: SCCP4 Timer Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 11
CCT3IE: MCCP3 Timer Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 10
OC6IE: Output Compare Channel 6 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 9
OC5IE: Output Compare Channel 5 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 8
IC6IE: Input Capture Channel 6 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 7
IC5IE: Input Capture Channel 5 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 6
IC4IE: Input Capture Channel 4 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 5
IC3IE: Input Capture Channel 3 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 4
DMA3IE: DMA Channel 3 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
 2015 Microchip Technology Inc.
x = Bit is unknown
DS30010089C-page 135
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-16:
IEC2: INTERRUPT ENABLE CONTROL REGISTER 2 (CONTINUED)
bit 3
CRYROLLIE: Cryptographic Rollover Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 2
CRYFREEIE: Cryptographic Buffer Free Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 1
SPI2TXIE: SPI2 Transmit Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 0
SPI2IE: SPI2 General Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
DS30010089C-page 136
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-17:
IEC3: INTERRUPT ENABLE CONTROL REGISTER 3
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
CCP1IE
RTCIE
DMA5IE
SPI3RXIE
SPI2RXIE
SPI1RXIE
SPI4RXIE
KEYSTRIE
bit 15
bit 8
R/W-0
R/W-0
R/W-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
CRYDNIE
INT4IE(1)
INT3IE(1)
—
CCT7IE
MI2C2IE
SI2C2IE
CCT6IE
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
CCP1IE: MCCP1 Capture/Compare Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 14
RTCIE: Real-Time Clock and Calendar Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 13
DMA5IE: DMA Channel 5 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 12
SPI3RXIE: SPI3 Receive Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 11
SPI2RXIE: SPI2 Receive Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 10
SPI1RXIE: SPI1 Receive Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 9
SPI4RXIE: SPI4 Receive Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 8
KEYSTRIE: Cryptographic Key Store Program Done Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 7
CRYDNIE: Cryptographic Operation Done Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 6
INT4IE: External Interrupt 4 Enable bit(1)
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 5
INT3IE: External Interrupt 3 Enable bit(1)
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 4
Unimplemented: Read as ‘0’
Note 1:
x = Bit is unknown
If an external interrupt is enabled, the interrupt input must also be configured to an available RPn or RPIn
pin. See Section 11.4 “Peripheral Pin Select (PPS)” for more information.
 2015 Microchip Technology Inc.
DS30010089C-page 137
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-17:
IEC3: INTERRUPT ENABLE CONTROL REGISTER 3 (CONTINUED)
bit 3
CCT7IE: SCCP7 Timer Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 2
MI2C2IE: Master I2C2 Event Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 1
SI2C2IE: Slave I2C2 Event Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 0
CCT6IE: SCCP6 Timer Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
Note 1:
If an external interrupt is enabled, the interrupt input must also be configured to an available RPn or RPIn
pin. See Section 11.4 “Peripheral Pin Select (PPS)” for more information.
DS30010089C-page 138
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-18:
IEC4: INTERRUPT ENABLE CONTROL REGISTER 4
U-0
R/W-0
R/W-0
U-0
U-0
U-0
R/W-0
R/W-0
—
DAC1IE
CTMUIE
—
—
—
CCP7IE
HLVDIE
bit 15
bit 8
R/W-0
R/W-0
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
MI2C3IE
SI2C3IE
—
—
CRCIE
U2ERIE
U1ERIE
CCP2IE
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
Unimplemented: Read as ‘0’
bit 14
DAC1IE: DAC Converter Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 13
CTMUIE: CTMU Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 12-10
Unimplemented: Read as ‘0’
bit 9
CCP7IE: SCCP7 Capture/Compare Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 8
HLVDIE: High/Low-Voltage Detect Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 7
MI2C3IE: Master I2C3 Event Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 6
SI2C3IE: Slave I2C3 Event Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 5-4
Unimplemented: Read as ‘0’
bit 3
CRCIE: CRC Generator Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 2
U2ERIE: UART2 Error Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 1
U1ERIE: UART1 Error Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 0
CCP2IE: MCCP2 Capture/Compare Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
 2015 Microchip Technology Inc.
x = Bit is unknown
DS30010089C-page 139
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-19:
IEC5: INTERRUPT ENABLE CONTROL REGISTER 5
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
CCP4IE
CCP3IE
SPI4TXIE
SPI4IE
SPI3TXIE
SPI3IE
U4TXIE
U4RXIE
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
U-0
U4ERIE
USB1IE
I2C2BCIE
I2C1BCIFE
U3TXIE
U3RXIE
U3ERIE
—
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
CCP4IE: SCCP4 Capture/Compare Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 14
CCP3IE: MCCP3 Capture/Compare Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 13
SPI4TXIE: SPI4 Transmit Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 12
SPI4IE: SPI4 General Interrupt Enable bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 11
SPI3TXIE: SPI3 Transmit Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 10
SPI3IE: SPI3 General Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 9
U4TXIE: UART4 Transmitter Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 8
U4RXIE: UART4 Receiver Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 7
U4ERIE: UART4 Error Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 6
USB1IE: USB1 (USB OTG) Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 5
I2C2BCIE: I2C2 Bus Collision Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 4
I2C1BCIE: I2C1 Bus Collision Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
DS30010089C-page 140
x = Bit is unknown
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-19:
IEC5: INTERRUPT ENABLE CONTROL REGISTER 5 (CONTINUED)
bit 3
U3TXIE: UART3 Transmitter Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 2
U3RXIE: UART3 Receiver Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 1
U3ERIE: UART3 Error Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 0
Unimplemented: Read as ‘0’
 2015 Microchip Technology Inc.
DS30010089C-page 141
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-20:
IEC6: INTERRUPT ENABLE CONTROL REGISTER 6
R/W-0
R/W-0
R/W-0
U-0
U-0
R/W-0
U-0
U-0
U5RXIE
RTCTSIE
I2C3BCIE
—
—
FSTIE
—
—
bit 15
bit 8
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
CCT2IE
CCT1IE
LCDIE
CLC4IE
CLC3IE
CLC2IE
CLC1IE
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
U5RXIE: UART5 Receiver Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 14
RTCTSIE: RTCC Timestamp Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 13
I2C3BCIE: I2C3 Bus Collision Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 12-11
Unimplemented: Read as ‘0’
bit 10
FSTIE: FRC Self-Tune Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 9-7
Unimplemented: Read as ‘0’
bit 6
CCT2IE: MCCP2 Timer Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 5
CCT1IE: MCCP1 Timer Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 4
LCDIE: LCD Controller Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 3
CLC4IE: CLC4 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 2
CLC3IE: CLC3 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 1
CLC2IE: CLC2 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 0
CLC1IE: CLC1 Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
DS30010089C-page 142
x = Bit is unknown
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-21:
IEC7: INTERRUPT ENABLE CONTROL REGISTER 7
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
JTAGIE
U6ERIE
U6TXIE
U6RXIE
U5ERIE
U5TXIE
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-6
Unimplemented: Read as ‘0’
bit 5
JTAGIE: JATG Interrupt Enable bit
1 = Interrupt request is enabled
0 = Interrupt request is not enabled
bit 4
U6ERIE: UART6 Error Interrupt Enable bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 3
U6TXIE: UART6 Transmitter Interrupt Enable bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 2
U6RXIE: UART6 Receiver Interrupt Enable bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 1
U5ERIE: UART5 Error Interrupt Enable bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
bit 0
U5TXIE: UART5 Transmitter Interrupt Enable bit
1 = Interrupt request has occurred
0 = Interrupt request has not occurred
 2015 Microchip Technology Inc.
x = Bit is unknown
DS30010089C-page 143
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-22:
IPC0: INTERRUPT PRIORITY CONTROL REGISTER 0
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
T1IP2
T1IP1
T1IP0
—
OC1IP2
OC1IP1
OC1IP0
bit 15
bit 8
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
IC1IP2
IC1IP1
IC1IP0
—
INT0IP2
INT0IP1
INT0IP0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
Unimplemented: Read as ‘0’
bit 14-12
T1IP<2:0>: Timer1 Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
x = Bit is unknown
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 11
Unimplemented: Read as ‘0’
bit 10-8
OC1IP<2:0>: Output Compare Channel 1 Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 7
Unimplemented: Read as ‘0’
bit 6-4
IC1IP<2:0>: Input Capture Channel 1 Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 3
Unimplemented: Read as ‘0’
bit 2-0
INT0IP<2:0>: External Interrupt 0 Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
DS30010089C-page 144
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-23:
IPC1: INTERRUPT PRIORITY CONTROL REGISTER 1
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
T2IP2
T2IP1
T2IP0
—
OC2IP2
OC2IP1
OC2IP0
bit 15
bit 8
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
IC2IP2
IC2IP1
IC2IP0
—
DMA0IP2
DMA0IP1
DMA0IP0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
Unimplemented: Read as ‘0’
bit 14-12
T2IP<2:0>: Timer2 Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 11
Unimplemented: Read as ‘0’
bit 10-8
OC2IP<2:0>: Output Compare Channel 2 Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 7
Unimplemented: Read as ‘0’
bit 6-4
IC2IP<2:0>: Input Capture Channel 2 Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
x = Bit is unknown
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 3
Unimplemented: Read as ‘0’
bit 2-0
DMA0IP<2:0>: DMA Channel 0 Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
 2015 Microchip Technology Inc.
DS30010089C-page 145
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-24:
IPC2: INTERRUPT PRIORITY CONTROL REGISTER 2
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
U1RXIP2
U1RXIP1
U1RXIP0
—
SPI1TXIP2
SPI1TXIP1
SPI1TXIP0
bit 15
bit 8
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
SPI1IP2
SPI1IP1
SPI1IP0
—
T3IP2
T3IP1
T3IP0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
Unimplemented: Read as ‘0’
bit 14-12
U1RXIP<2:0>: UART1 Receiver Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 11
Unimplemented: Read as ‘0’
bit 10-8
SPI1TXIP<2:0>: SPI1 Transmit Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 7
Unimplemented: Read as ‘0’
bit 6-4
SPI1IP<2:0>: SPI1 General Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
x = Bit is unknown
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 3
Unimplemented: Read as ‘0’
bit 2-0
T3IP<2:0>: Timer3 Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
DS30010089C-page 146
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-25:
IPC3: INTERRUPT PRIORITY CONTROL REGISTER 3
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
NVMIP2
NVMIP1
NVMIP0
—
DMA1IP2
DMA1IP1
DMA1IP0
bit 15
bit 8
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
AD1IP2
AD1IP1
AD1IP0
—
U1TXIP2
U1TXIP1
U1TXIP0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
Unimplemented: Read as ‘0’
bit 14-11
NVMIP<2:0>: Flash Memory Write/Program Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 7
Unimplemented: Read as ‘0’
bit 10-8
DMA1IP<2:0>: DMA Channel 1 Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 7
Unimplemented: Read as ‘0’
bit 6-4
AD1IP<2:0>: 12-Bit Pipeline A/D Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 3
Unimplemented: Read as ‘0’
bit 2-0
U1TXIP<2:0>: UART1 Transmitter Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
x = Bit is unknown
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
 2015 Microchip Technology Inc.
DS30010089C-page 147
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-26:
IPC4: INTERRUPT PRIORITY CONTROL REGISTER 4
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
CNIP2
CNIP1
CNIP0
—
CMIP2
CMIP1
CMIP0
bit 15
bit 8
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
MI2C1IP2
MI2C1IP1
MI2C1IP0
—
SI2C1IP2
SI2C1IP1
SI2C1IP0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
Unimplemented: Read as ‘0’
bit 14-12
CNIP<2:0>: Input Change Notification Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 11
Unimplemented: Read as ‘0’
bit 10-8
CMIP<2:0>: Comparator Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 7
Unimplemented: Read as ‘0’
bit 6-4
MI2C1IP<2:0>: Master I2C1 Event Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
x = Bit is unknown
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 3
Unimplemented: Read as ‘0’
bit 2-0
SI2C1IP<2:0>: Slave I2C1 Event Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
DS30010089C-page 148
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-27:
IPC5: INTERRUPT PRIORITY CONTROL REGISTER 5
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
CCP6IP2
CCP6IP1
CCP6IP0
—
CCP5IP2
CCP5IP1
CCP5IP0
bit 15
bit 8
U-0
U-0
U-0
U-0
U-0
R/W-1
R/W-0
R/W-0
—
—
—
—
—
INT1IP2
INT1IP1
INT1IP0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
Unimplemented: Read as ‘0’
bit 14-12
CCP6IP<2:0>: SCCP6 Capture/Compare Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 11
Unimplemented: Read as ‘0’
bit 10-8
CCP5IP<2:0>: SCCP5 Capture/Compare Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 7-3
Unimplemented: Read as ‘0’
bit 2-0
INT1IP<2:0>: External Interrupt 1 Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
x = Bit is unknown
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
 2015 Microchip Technology Inc.
DS30010089C-page 149
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-28:
IPC6: INTERRUPT PRIORITY CONTROL REGISTER 6
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
T4IP2
T4IP1
T4IP0
—
OC4IP2
OC4IP1
OC4IP0
bit 15
bit 8
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
OC3IP2
OC3IP1
OC3IP0
—
DMA2IP2
DMA2IP1
DMA2IP0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
Unimplemented: Read as ‘0’
bit 14-12
T4IP<2:0>: Timer4 Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 11
Unimplemented: Read as ‘0’
bit 10-8
OC4IP<2:0>: Output Compare Channel 4 Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 7
Unimplemented: Read as ‘0’
bit 6-4
OC3IP<2:0>: Output Compare Channel 3 Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
x = Bit is unknown
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 3
Unimplemented: Read as ‘0’
bit 2-0
DMA2IP<2:0>: DMA Channel 2 Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
DS30010089C-page 150
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-29:
IPC7: INTERRUPT PRIORITY CONTROL REGISTER 7
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
U2TXIP2
U2TXIP1
U2TXIP0
—
U2RXIP2
U2RXIP1
U2RXIP0
bit 15
bit 8
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
INT2IP2
INT2IP1
INT2IP0
—
T5IP2
T5IP1
T5IP0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
Unimplemented: Read as ‘0’
bit 14-12
U2TXIP<2:0>: UART2 Transmitter Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 11
Unimplemented: Read as ‘0’
bit 10-8
U2RXIP<2:0>: UART2 Receiver Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 7
Unimplemented: Read as ‘0’
bit 6-4
INT2IP<2:0>: External Interrupt 2 Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
x = Bit is unknown
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 3
Unimplemented: Read as ‘0’
bit 2-0
T5IP<2:0>: Timer5 Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
 2015 Microchip Technology Inc.
DS30010089C-page 151
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-30:
U-0
—
IPC8: INTERRUPT PRIORITY CONTROL REGISTER 8
R/W-1
R/W-0
R/W-0
CRYROLLIP2 CRYROLLIP1 CRYROLLIP0
U-0
—
R/W-1
R/W-0
R/W-0
CRYFREEIP2 CRYFREEIP1 CRYFREEIP0
bit 15
bit 8
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
SPI2TXIP2
SPI2TXIP1
SPI2TXIP0
—
SPI2IP2
SPI2IP1
SPI2IP0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
Unimplemented: Read as ‘0’
bit 14-12
CRYROLLIP<2:0>: Cryptographic Rollover Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 11
Unimplemented: Read as ‘0’
bit 10-8
CRYFREEIP<2:0>: Cryptographic Buffer Free Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 7
Unimplemented: Read as ‘0’
bit 6-4
SPI2TXIP<2:0>: SPI2 Transmit Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 3
Unimplemented: Read as ‘0’
bit 2-0
SPI2IP<2:0>: SPI2 General Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
DS30010089C-page 152
x = Bit is unknown
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-31:
IPC9: INTERRUPT PRIORITY CONTROL REGISTER 9
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
IC5IP2
IC5IP1
IC5IP0
—
IC4IP2
IC4IP1
IC4IP0
bit 15
bit 8
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
IC3IP2
IC3IP1
IC3IP0
—
DMA3IP2
DMA3IP1
DMA3IP0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
Unimplemented: Read as ‘0’
bit 14-12
IC5IP<2:0>: Input Capture Channel 5 Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 11
Unimplemented: Read as ‘0’
bit 10-8
IC4IP<2:0>: Input Capture Channel 4 Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 7
Unimplemented: Read as ‘0’
bit 6-4
IC3IP<2:0>: Input Capture Channel 3 Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
x = Bit is unknown
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 3
Unimplemented: Read as ‘0’
bit 2-0
DMA3IP<2:0>: DMA Channel 3 Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
 2015 Microchip Technology Inc.
DS30010089C-page 153
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-32:
IPC10: INTERRUPT PRIORITY CONTROL REGISTER 10
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
CCT3IP2
CCT3IP1
CCT3IP0
—
OC6IP2
OC6IP1
OC6IP0
bit 15
bit 8
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
OC5IP2
OC5IP1
OC5IP0
—
IC6IP2
IC6IP1
IC6IP0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
Unimplemented: Read as ‘0’
bit 14-12
CCT3IP<2:0>: MCCP3 Timer Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 11
Unimplemented: Read as ‘0’
bit 10-8
OC6IP<2:0>: Output Compare Channel 6 Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 7
Unimplemented: Read as ‘0’
bit 6-4
OC5IP<2:0>: Output Compare Channel 5 Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
x = Bit is unknown
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 3
Unimplemented: Read as ‘0’
bit 2-0
IC6IP<2:0>: Input Capture Channel 6 Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
DS30010089C-page 154
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-33:
IPC11: INTERRUPT PRIORITY CONTROL REGISTER 11
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
CCT5IP2
CCT5IP1
CCT5IP0
—
DMA4IP2
DMA4IP1
DMA4IP0
bit 15
bit 8
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
PMPIP2
PMPIP1
PMPIP0
—
CCT4IP2
CCT4IP1
CCT4IP0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
Unimplemented: Read as ‘0’
bit 14-12
CCT5IP<2:0>: SCCP5 Timer Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
x = Bit is unknown
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 10-8
DMA4IP<2:0>: DMA Channel 4 Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 7
Unimplemented: Read as ‘0’
bit 6-4
PMPIP<2:0>: Parallel Master Port Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 3
Unimplemented: Read as ‘0’
bit 2-0
CCT4IP<2:0>: SCCP4 Timer Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
 2015 Microchip Technology Inc.
DS30010089C-page 155
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-34:
IPC12: INTERRUPT PRIORITY CONTROL REGISTER 12
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
CCT7IP2
CCT7IP1
CCT7IP0
—
MI2C2IP2
MI2C2IP1
MI2C2IP0
bit 15
bit 8
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
SI2C2IP2
SI2C2IP1
SI2C2IP0
—
CCT6IP2
CCT6IP1
CCT6IP0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
Unimplemented: Read as ‘0’
bit 14-12
CCT7IP<2:0>: SCCP7 Timer Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 11
Unimplemented: Read as ‘0’
bit 10-8
MI2C2IP<2:0>: Master I2C2 Event Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 7
Unimplemented: Read as ‘0’
bit 6-4
SI2C2IP<2:0>: Slave I2C2 Event Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 3
Unimplemented: Read as ‘0’
bit 2-0
CCT6IP<2:0>: SCCP6 Timer Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
DS30010089C-page 156
x = Bit is unknown
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-35:
IPC13: INTERRUPT PRIORITY CONTROL REGISTER 13
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
CRYDNIP2
CRYDNIP21
CRYDNIP0
—
INT4IP2
INT4IP1
INT4IP0
bit 15
bit 8
U-0
R/W-1
R/W-0
R/W-0
U-0
U-0
U-0
U-0
—
INT3IP2
INT3IP1
INT3IP0
—
—
—
—
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
Unimplemented: Read as ‘0’
bit 14-12
CRYDNIP<2:0>: Cryptographic Operation Done Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 11
Unimplemented: Read as ‘0’
bit 10-8
INT4IP<2:0>: External Interrupt 4 Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 7
Unimplemented: Read as ‘0’
bit 6-4
INT3IP<2:0>: External Interrupt 3 Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 3-0
Unimplemented: Read as ‘0’
 2015 Microchip Technology Inc.
x = Bit is unknown
DS30010089C-page 157
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-36:
IPC14: INTERRUPT PRIORITY CONTROL REGISTER 14
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
SPI2RXIP2
SPI2RXIP1
SPI2RXIP0
—
SPI1RXIP2
SPI1RXIP1
SPI1RXIP0
bit 15
bit 8
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
SPI4RXIP2
SPI4RXIP1
SPI4RXIP0
—
KEYSTRIP2
KEYSTRIP1
KEYSTRIP0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
Unimplemented: Read as ‘0’
bit 14-12
SPI2RXIP<2:0>: SPI2 Receive Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 11
Unimplemented: Read as ‘0’
bit 10-8
SPI1RXIP<2:0>: SPI1 Receive Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 7
Unimplemented: Read as ‘0’
bit 6-4
SPI4RXIP<2:0>: SPI4 Receive Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
x = Bit is unknown
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 3
Unimplemented: Read as ‘0’
bit 2-0
KEYSTRIP<2:0>: Cryptographic Key Store Program Done Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
DS30010089C-page 158
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-37:
IPC15: INTERRUPT PRIORITY CONTROL REGISTER 15
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
CCP1IP2
CCP1IP1
CCP1IP0
—
RTCIP2
RTCIP1
RTCIP0
bit 15
bit 8
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
DMA5IP2
DMA5IP1
DMA5IP0
—
SPI3RXIP2
SPI3RXIP1
SPI3RXIP0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
Unimplemented: Read as ‘0’
bit 14-12
CCP1IP<2:0>: MCCP1 Capture/Compare Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 11
Unimplemented: Read as ‘0’
bit 10-8
RTCIP<2:0>: Real-Time Clock and Calendar Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 7
Unimplemented: Read as ‘0’
bit 6-4
DMA5IP<2:0>: DMA Channel 5 Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 3
Unimplemented: Read as ‘0’
bit 2-0
SPI3RXIP<2:0>: SPI3 Receive Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
 2015 Microchip Technology Inc.
x = Bit is unknown
DS30010089C-page 159
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-38:
IPC16: INTERRUPT PRIORITY CONTROL REGISTER 16
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
CRCIP2
CRCIP1
CRCIP0
—
U2ERIP2
U2ERIP1
U2ERIP0
bit 15
bit 8
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
U1ERIP2
U1ERIP1
U1ERIP0
—
CCP2IP2
CCP2IP1
CCP2IP0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
Unimplemented: Read as ‘0’
bit 14-12
CRCIP<2:0>: CRC Generator Error Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 11
Unimplemented: Read as ‘0’
bit 10-8
U2ERIP<2:0>: UART2 Error Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 7
Unimplemented: Read as ‘0’
bit 6-4
U1ERIP<2:0>: UART1 Error Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
x = Bit is unknown
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 3
Unimplemented: Read as ‘0’
bit 2-0
CCP2IP<2:0>: MCCP2 Capture/Compare Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
DS30010089C-page 160
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-39:
IPC17: INTERRUPT PRIORITY CONTROL REGISTER 17
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
MI2C3IP2
MI2C3IP1
MI2C3IP0
—
SI2C3IP2
SI2C3IP1
SI2C3IP0
bit 15
bit 8
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
Unimplemented: Read as ‘0’
bit 14-12
MI2C3IP<2:0>: Master I2C3 Event Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 11
Unimplemented: Read as ‘0’
bit 10-8
SI2C3IP<2:0>: Slave I2C3 Event Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 7-0
Unimplemented: Read as ‘0’
 2015 Microchip Technology Inc.
x = Bit is unknown
DS30010089C-page 161
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-40:
IPC18: INTERRUPT PRIORITY CONTROL REGISTER 18
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
CCP7IP2
CCP7IP1
CCP7IP0
—
HLVDIP2
HLVDIP1
HLVDIP0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-7
Unimplemented: Read as ‘0’
bit 6-4
CCP7IP<2:0>: SCCP7 Capture/Compare Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 3
Unimplemented: Read as ‘0’
bit 2-0
HLVDIP<2:0>: High/Low-Voltage Detect Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
DS30010089C-page 162
x = Bit is unknown
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-41:
IPC19: INTERRUPT PRIORITY CONTROL REGISTER 19
U-0
U-0
U-0
U-0
U-0
R/W-1
R/W-0
R/W-0
—
—
—
—
—
DAC1IP2
DAC1IP1
DAC1IP0
bit 15
bit 8
U-0
R/W-1
R/W-0
R/W-0
U-0
U-0
U-0
U-0
—
CTMUIP2
CTMUIP1
CTMUIP0
—
—
—
—
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-11
Unimplemented: Read as ‘0’
bit 10-8
DAC1IP<2:0>: DAC Converter Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 7
Unimplemented: Read as ‘0’
bit 6-4
CTMUIP<2:0>: CTMU Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
x = Bit is unknown
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 3-0
Unimplemented: Read as ‘0’
 2015 Microchip Technology Inc.
DS30010089C-page 163
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-42:
IPC20: INTERRUPT PRIORITY CONTROL REGISTER 20
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
U3TXIP2
U3TXIP1
U3TXIP0
—
U3RXIP2
U3RXIP1
U3RXIP0
bit 15
bit 8
U-0
R/W-1
R/W-0
R/W-0
U-0
U-0
U-0
U-0
—
U3ERIP2
U3ERIP1
U3ERIP0
—
—
—
—
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
Unimplemented: Read as ‘0’
bit 14-12
U3TXIP<2:0>: UART3 Transmitter Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 11
Unimplemented: Read as ‘0’
bit 10-8
U3RXIP<2:0>: UART3 Receiver Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 7
Unimplemented: Read as ‘0’
bit 6-4
U3ERIP<2:0>: UART3 Error Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
x = Bit is unknown
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 3-0
Unimplemented: Read as ‘0’
DS30010089C-page 164
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-43:
IPC21: INTERRUPT PRIORITY CONTROL REGISTER 21
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
U4ERIP2
U4ERIP1
U4ERIP0
—
USB1IP2
USB1IP1
USB1IP0
bit 15
bit 8
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
I2C2BCIP2
I2C2BCIP1
I2C2BCIP0
—
I2C1BCIP2
I2C1BCIP1
I2C1BCIP0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
Unimplemented: Read as ‘0’
bit 14-12
U4ERIP<2:0>: UART4 Error Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 11
Unimplemented: Read as ‘0’
bit 10-8
USB1IP<2:0>: USB1 (USB OTG) Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 7
Unimplemented: Read as ‘0’
bit 6-4
I2C2BCIP<2:0>: I2C2 Bus Collision Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 3
Unimplemented: Read as ‘0’
bit 2-0
I2C1BCIP<2:0>: I2C1 Bus Collision Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
 2015 Microchip Technology Inc.
x = Bit is unknown
DS30010089C-page 165
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-44:
IPC22: INTERRUPT PRIORITY CONTROL REGISTER 22
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
SPI3TXIP2
SPI3TXIP1
SPI3TXIP0
—
SPI3IP2
SPI3IP1
SPI3IP0
bit 15
bit 8
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
U4TXIP2
U4TXIP1
U4TXIP0
—
U4RXIP2
U4RXIP1
U4RXIP0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
Unimplemented: Read as ‘0’
bit 14-12
SPI3TXIP<2:0>: SPI3 Transmit Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 11
Unimplemented: Read as ‘0’
bit 10-8
SPI3IP<2:0>: SPI3 General Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 7
Unimplemented: Read as ‘0’
bit 6-4
U4TXIP<2:0>: UART4 Transmitter Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 3
Unimplemented: Read as ‘0’
bit 2-0
U4RXIP<2:0>: UART4 Receiver Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
DS30010089C-page 166
x = Bit is unknown
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-45:
IPC23: INTERRUPT PRIORITY CONTROL REGISTER 23
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
CCP4IP2
CCP4IP1
CCP4IP0
—
CCP3IP2
CCP3IP1
CCP3IP0
bit 15
bit 8
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
SPI4TXIP2
SPI4TXIP1
SPI4TXIP0
—
SPI4IP2
SPI4IP1
SPI4IP0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
Unimplemented: Read as ‘0’
bit 14-12
CCP4IP<2:0>: SCCP4 Capture/Compare Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 11
Unimplemented: Read as ‘0’
bit 10-8
CCP3IP<2:0>: MCCP3 Capture/Compare Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 7
Unimplemented: Read as ‘0’
bit 6-4
SPI4TXIP<2:0>: SPI4 Transmit Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 3
Unimplemented: Read as ‘0’
bit 2-0
SPI4IP<2:0>: SPI4 General Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
 2015 Microchip Technology Inc.
x = Bit is unknown
DS30010089C-page 167
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-46:
IPC24: INTERRUPT PRIORITY CONTROL REGISTER 24
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
CLC4IP2
CLC4IP1
CLC4IP0
—
CLC3IP2
CLC3IP1
CLC3IP0
bit 15
bit 8
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
CLC2IP2
CLC2IP1
CLC2IP0
—
CLC1IP2
CLC1IP1
CLC1IP0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
Unimplemented: Read as ‘0’
bit 14-12
CLC4IP<2:0>: CLC4 Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 11
Unimplemented: Read as ‘0’
bit 10-8
CLC3IP<2:0>: CLC3 Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 7
Unimplemented: Read as ‘0’
bit 6-4
CLC2IP<2:0>: CLC2 Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
x = Bit is unknown
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 3
Unimplemented: Read as ‘0’
bit 2-0
CLC1IP<2:0>: CLC1 Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
DS30010089C-page 168
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-47:
IPC25: INTERRUPT PRIORITY CONTROL REGISTER 25
U-0
U-0
U-0
U-0
U-0
R/W-1
R/W-0
R/W-0
—
—
—
—
—
CCT2IP2
CCT2IP1
CCT2IP0
bit 15
bit 8
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
CCT1IP2
CCT1IP1
CCT1IP0
—
LCDIP2
LCDIP1
LCDIP0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-11
Unimplemented: Read as ‘0’
bit 10-8
CCT2IP<2:0>: MCCP2 Timer Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 7
Unimplemented: Read as ‘0’
bit 6-4
CCT1IP<2:0>: MCCP1 Timer Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 3
Unimplemented: Read as ‘0’
bit 2-0
LCDIP<2:0>: LCD Controller Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
 2015 Microchip Technology Inc.
x = Bit is unknown
DS30010089C-page 169
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-48:
IPC26: INTERRUPT PRIORITY CONTROL REGISTER 26
U-0
U-0
U-0
U-0
U-0
R/W-1
R/W-0
R/W-0
—
—
—
—
—
FSTIP2
FSTIP1
FSTIP0
bit 15
bit 8
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-11
Unimplemented: Read as ‘0’
bit 10-8
FSTIP<2:0>: FRC Self-Tune Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 7-0
Unimplemented: Read as ‘0’
DS30010089C-page 170
x = Bit is unknown
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-49:
IPC27: INTERRUPT PRIORITY CONTROL REGISTER 27
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
U5RXIP2
U5RXIP1
U5RXIP0
—
RTCTSIP2
RTCTSIP1
RTCTSIP0
bit 15
bit 8
U-0
R/W-1
R/W-0
R/W-0
U-0
U-0
U-0
U-0
—
I2C3BCIP2
I2C3BCIP1
I2C3BCIP0
—
—
—
—
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
Unimplemented: Read as ‘0’
bit 14-12
U5RXIP<2:0>: UART5 Receiver Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 1
Unimplemented: Read as ‘0’
bit 10-8
RTCTSIP<2:0>: RTCC Timestamp Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 7
Unimplemented: Read as ‘0’
bit 6-4
I2C3BCIP<2:0>: I2C3 Bus Collision Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
x = Bit is unknown
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 3-0
Unimplemented: Read as ‘0’
 2015 Microchip Technology Inc.
DS30010089C-page 171
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-50:
IPC28: INTERRUPT PRIORITY CONTROL REGISTER 28
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
U6TXIP2
U6TXIP1
U6TXIP0
—
U6RXIP2
U6RXIP1
U6RXIP0
bit 15
bit 8
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
U5ERIP2
U5ERIP1
U5ERIP0
—
U5TXIP2
U5TXIP1
U5TXIP0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
Unimplemented: Read as ‘0’
bit 14-12
U6TXIP<2:0>: UART6 Transmitter Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 11
Unimplemented: Read as ‘0’
bit 10-8
U6RXIP<2:0>: UART6 Receiver Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 7
Unimplemented: Read as ‘0’
bit 6-4
U5ERIP<2:0>: UART5 Error Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
x = Bit is unknown
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 3
Unimplemented: Read as ‘0’
bit 2-0
U5TXIP<2:0>: UART5 Transmitter Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
DS30010089C-page 172
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-51:
IPC29: INTERRUPT PRIORITY CONTROL REGISTER 29
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
U-0
R/W-1
R/W-0
R/W-0
U-0
R/W-1
R/W-0
R/W-0
—
JTAGIP2
JTAGIP1
JTAGIP0
—
U6ERIP2
U6ERIP1
U6ERIP0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-7
Unimplemented: Read as ‘0’
bit 6-4
JTAGIP<2:0>: JTAG Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
bit 3
Unimplemented: Read as ‘0’
bit 2-0
U6ERIP<2:0>: UART6 Error Interrupt Priority bits
111 = Interrupt is Priority 7 (highest priority interrupt)
•
•
•
001 = Interrupt is Priority 1
000 = Interrupt source is disabled
 2015 Microchip Technology Inc.
x = Bit is unknown
DS30010089C-page 173
PIC24FJ256GA412/GB412 FAMILY
REGISTER 8-52:
INTTREG: INTERRUPT CONTROLLER TEST REGISTER
R-0
r-0
R/W-0
U-0
R-0
R-0
R-0
R-0
CPUIRQ
—
VHOLD
—
ILR3
ILR2
ILR1
ILR0
bit 15
bit 8
U-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
—
VECNUM6
VECNUM5
VECNUM4
VECNUM3
VECNUM2
VECNUM1
VECNUM0
bit 7
bit 0
Legend:
r = Reserved bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
CPUIRQ: Interrupt Request from Interrupt Controller CPU bit
1 = An interrupt request has occurred but has not yet been Acknowledged by the CPU; this happens
when the CPU priority is higher than the interrupt priority
0 = No interrupt request is unacknowledged
bit 14
Reserved: Maintain as ‘0’
bit 13
VHOLD: Vector Number Capture Configuration bit
1 = VECNUM<6:0> bits contain the value of the highest priority pending interrupt
0 = VECNUM<6:0> bits contain the value of the last Acknowledged interrupt (i.e., the last interrupt that
has occurred with higher priority than the CPU, even if other interrupts are pending)
bit 12
Unimplemented: Read as ‘0’
bit 11-8
ILR<3:0>: New CPU Interrupt Priority Level bits
1111 = CPU Interrupt Priority Level is 15
•
•
•
0001 = CPU Interrupt Priority Level is 1
0000 = CPU Interrupt Priority Level is 0
bit 7
Unimplemented: Read as ‘0’
bit 6-0
VECNUM<6:0>: Vector Number of Pending Interrupt or Last Acknowledged Interrupt bits
When VHOLD = 1:
Indicates the vector number (from 0 to 118) of the last interrupt to occur.
When VHOLD = 0:
Indicates the vector number (from 0 to 118) of the interrupt request currently being handled.
DS30010089C-page 174
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
8.4
Interrupt Setup Procedures
8.4.1
INITIALIZATION
To configure an interrupt source:
1.
2.
Set the NSTDIS (INTCON1<15>) control bit if
nested interrupts are not desired.
Select the user-assigned priority level for the
interrupt source by writing the control bits in the
appropriate IPCx register. The priority level will
depend on the specific application and type of
interrupt source. If multiple priority levels are not
desired, the IPCx register control bits, for all
enabled interrupt sources, may be programmed
to the same non-zero value.
Note:
3.
4.
At a device Reset, the IPCx registers are
initialized such that all user interrupt
sources are assigned to Priority Level 4.
Clear the interrupt flag status bit associated with
the peripheral in the associated IFSx register.
Enable the interrupt source by setting the
interrupt enable control bit associated with the
source in the appropriate IECx register.
8.4.2
8.4.3
TRAP SERVICE ROUTINE (TSR)
A Trap Service Routine (TSR) is coded like an ISR,
except that the appropriate trap status flag in the
INTCON1 register must be cleared to avoid re-entry
into the TSR.
8.4.4
INTERRUPT DISABLE
All user interrupts can be disabled using the following
procedure:
1.
2.
Push the current SR value onto the software
stack using the PUSH instruction.
Force the CPU to Priority Level 7 by inclusive
ORing the value, 0Eh, with SRL.
To enable user interrupts, the POP instruction may be
used to restore the previous SR value.
Note that only user interrupts with a priority level of 7 or
less can be disabled. Trap sources (Levels 8-15) cannot
be disabled.
The DISI instruction provides a convenient way to
disable interrupts of Priority Levels 1-6 for a fixed
period of time. Level 7 interrupt sources are not
disabled by the DISI instruction.
INTERRUPT SERVICE ROUTINE
(ISR)
The method that is used to declare an Interrupt Service
Routine (ISR) and initialize the IVT with the correct vector address will depend on the programming language
(i.e., ‘C’ or assembler), and the language development
toolsuite that is used to develop the application. In
general, the user must clear the interrupt flag in the
appropriate IFSx register for the source of the interrupt
that the ISR handles; otherwise, the ISR will be
re-entered immediately after exiting the routine. If the
ISR is coded in assembly language, it must be terminated using a RETFIE instruction to unstack the saved
PC value, SRL value and old CPU priority level.
 2015 Microchip Technology Inc.
DS30010089C-page 175
PIC24FJ256GA412/GB412 FAMILY
NOTES:
DS30010089C-page 176
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
9.0
OSCILLATOR
CONFIGURATION
Note:
• An On-Chip PLL Block to provide a Wide Range of
Precise Frequency Options for the System Clock, plus
a Stable 48 MHz Clock for USB Devices
• Software-Controllable Switching between Various
Clock Sources
• Software-Controllable Postscaler for Selective
Clocking of CPU for System Power Savings
• A Fail-Safe Clock Monitor (FSCM) that Detects
Clock Failure and Permits Safe Application
Recovery or Shutdown
• A Separate and Independently Configurable
Reference Clock for Synchronizing External Hardware
This data sheet summarizes the features of
this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to
the “dsPIC33/PIC24 Family Reference
Manual”, “Oscillator” (DS39700).
The oscillator system for PIC24FJ256GA412/GB412
family devices has the following features:
• A Total of Four External and Internal Oscillator Options
as Clock Sources, providing 11 Different Clock Modes
FIGURE 9-1:
A simplified diagram of the oscillator system is shown
in Figure 9-1.
PIC24FJ256GA412/GB412 FAMILY GENERAL CLOCK DIAGRAM
PIC24FJ256GX412 Family
48 MHz USB Clock
Primary Oscillator
XT, HS, EC
OSCO
PLL Block
XTPLL, HSPLL
ECPLL,FRCPLL
PLL
OSCI
PLL96
+ DIV
FRC
Oscillator
8 MHz
(nominal)
Postscaler
PLLMODE<3:0> CPDIV<1:0>
8 MHz
4 MHz
Peripherals
RCDIV<2:0>
FRC
CLKO
FRC
Self-Tune
Control
LPRC
Oscillator
31 kHz (nominal)
Postscaler
Reference
from USB
D+/D-
FRCDIV
LPRC
Secondary Oscillator
DOZE<2:0>
SOSC
SOSCO
SOSCI
CPU
SOSCEN
Enable
Oscillator
Reference Clock
Generator
REFI
Clock Control Logic
Fail-Safe
Clock
Monitor
WDT, PWRT
Clock Source Option
for Other Modules
REFO
 2015 Microchip Technology Inc.
REFO
DS30010089C-page 177
PIC24FJ256GA412/GB412 FAMILY
9.1
CPU Clocking Scheme
9.2
The system clock source can be provided by one of
four sources:
• Primary Oscillator (POSC) on the OSCI and
OSCO pins
• Secondary Oscillator (SOSC) on the SOSCI and
SOSCO pins
• Fast Internal RC (FRC) Oscillator
• Low-Power Internal RC (LPRC) Oscillator
The Primary Oscillator and FRC sources have the
option of using the internal USB PLL block, which
generates both the USB module clock and a separate
system clock from the 96 MHZ PLL. Refer to
Section 9.6 “PLL Block” for additional information.
The internal FRC provides an 8 MHz clock source. It
can optionally be reduced by the programmable clock
divider to provide a range of system clock frequencies.
The selected clock source generates the processor
and peripheral clock sources. The processor clock
source is divided by two to produce the internal instruction cycle clock, FCY. In this document, the instruction
cycle clock is also denoted by FOSC/2. The internal
instruction cycle clock, FOSC/2, can be provided on the
OSCO I/O pin for some operating modes of the Primary
Oscillator.
TABLE 9-1:
Initial Configuration on POR
The oscillator source (and operating mode) that is used
at a device Power-on Reset event is selected using Configuration bit settings. The Oscillator Configuration bit
settings are located in the Configuration registers in the
program memory (refer to Section 33.1 “Configuration
Bits” for further details). The Primary Oscillator
Configuration bits, POSCMOD<1:0> (FOSC<1:0>),
and the Initial Oscillator Select Configuration bits,
FNOSC<2:0> (FOSCSEL<2:0>), select the oscillator
source that is used at a Power-on Reset. The FRC
Primary Oscillator with Postscaler (FRCDIV) is the
default (unprogrammed) selection. The Secondary
Oscillator (SOSC), or one of the internal oscillators,
may be chosen by programming these bit locations.
The Configuration bits allow users to choose between
the various clock modes, as shown in Table 9-1.
9.2.1
CLOCK SWITCHING MODE
CONFIGURATION BITS
The FCKSM<1:0> Configuration bits (FOSC<7:6>) are
used to jointly configure device clock switching and the
Fail-Safe Clock Monitor (FSCM). Clock switching is
enabled only when FCKSM1 is programmed (‘0’). The
FSCM is enabled only when FCKSM<1:0> are both
programmed (‘00’).
CONFIGURATION BIT VALUES FOR CLOCK SELECTION
Oscillator Mode
Oscillator Source
POSCMOD<1:0>
FNOSC<2:0>
Fast RC Oscillator with Postscaler
(FRCDIV)
Internal
11
111
1, 2
(Reserved)
Internal
xx
110
1
Low-Power RC Oscillator (LPRC)
Notes
Internal
11
101
1
Secondary
11
100
1
Primary Oscillator (XT) with PLL
Module (XTPLL)
Primary
01
011
Primary Oscillator (EC) with PLL
Module (ECPLL)
Primary
00
011
Primary Oscillator (HS)
Primary
10
010
Primary Oscillator (XT)
Primary
01
010
Primary Oscillator (EC)
Primary
00
010
Fast RC Oscillator with PLL Module
(FRCPLL)
Internal
11
001
1
Fast RC Oscillator (FRC)
Internal
11
000
1
Secondary (Timer1) Oscillator
(SOSC)
Note 1:
2:
OSCO pin function is determined by the OSCIOFCN Configuration bit.
This is the default oscillator mode for an unprogrammed (erased) device.
DS30010089C-page 178
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
9.3
Control Registers
The operation of the oscillator is controlled by three
Special Function Registers:
• OSCCON
• CLKDIV
• OSCTUN
The OSCCON register (Register 9-1) is the main control register for the oscillator. It controls clock source
switching and allows the monitoring of clock sources.
REGISTER 9-1:
OSCCON is protected by a write lock to prevent
inadvertent clock switches. See Section 9.4 “Clock
Switching Operation” for more information.
The CLKDIV register (Register 9-2) controls the
features associated with Doze mode, as well as the
postscaler for the FRC Oscillator.
The OSCTUN register (Register 9-3) allows the user to
fine-tune the FRC Oscillator over a range of approximately ±1.5%. It also controls the FRC self-tuning
features, described in Section 9.5 “FRC Active Clock
Tuning”.
OSCCON: OSCILLATOR CONTROL REGISTER
U-0
R-0
R-0
R-0
U-0
R/W-x(1)
R/W-x(1)
R/W-x(1)
—
COSC2
COSC1
COSC0
—
NOSC2
NOSC1
NOSC0
bit 15
bit 8
R/SO-0
R/W-0
R-0(3)
U-0
R/CO-0
R/W-0
R/W-0
R/W-0
CLKLOCK
IOLOCK(2)
LOCK
—
CF
POSCEN
SOSCEN
OSWEN
bit 7
bit 0
Legend:
CO = Clearable Only bit
SO = Settable Only bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
Unimplemented: Read as ‘0’
bit 14-12
COSC<2:0>: Current Oscillator Selection bits
111 = Fast RC Oscillator with Postscaler (FRCDIV)
110 = Reserved
101 = Low-Power RC Oscillator (LPRC)
100 = Secondary Oscillator (SOSC)
011 = Primary Oscillator with PLL module (XTPLL, HSPLL, ECPLL)
010 = Primary Oscillator (XT, HS, EC)
001 = Fast RC Oscillator with Postscaler and PLL module (FRCPLL)(4)
000 = Fast RC Oscillator (FRC)
bit 11
Unimplemented: Read as ‘0’
bit 10-8
NOSC<2:0>: New Oscillator Selection bits(1)
111 = Fast RC Oscillator with Postscaler (FRCDIV)
110 = Reserved
101 = Low-Power RC Oscillator (LPRC)
100 = Secondary Oscillator (SOSC)
011 = Primary Oscillator with PLL module (XTPLL, HSPLL, ECPLL)
010 = Primary Oscillator (XT, HS, EC)
001 = Fast RC Oscillator with Postscaler and PLL module (FRCPLL)(4)
000 = Fast RC Oscillator (FRC)
Note 1:
2:
3:
4:
x = Bit is unknown
Reset values for these bits are determined by the FNOSCx Configuration bits.
The state of the IOLOCK bit can only be changed once an unlocking sequence has been executed. In
addition, if the IOL1WAY Configuration bit is ‘1’ once the IOLOCK bit is set, it cannot be cleared.
This bit also resets to ‘0’ during any valid clock switch or whenever a non-PLL Clock mode is selected.
The default divisor of the postscaler is 2, which will generate a 4 MHz clock to the PLL module.
 2015 Microchip Technology Inc.
DS30010089C-page 179
PIC24FJ256GA412/GB412 FAMILY
REGISTER 9-1:
OSCCON: OSCILLATOR CONTROL REGISTER (CONTINUED)
bit 7
CLKLOCK: Clock Selection Lock Enable bit
If FSCM is enabled (FCKSM1 = 1):
1 = Clock and PLL selections are locked
0 = Clock and PLL selections are not locked and may be modified by setting the OSWEN bit
If FSCM is disabled (FCKSM1 = 0):
Clock and PLL selections are never locked and may be modified by setting the OSWEN bit.
bit 6
IOLOCK: I/O Lock Enable bit(2)
1 = I/O lock is active
0 = I/O lock is not active
bit 5
LOCK: PLL Lock Status bit(3)
1 = PLL module is in lock or PLL module start-up timer is satisfied
0 = PLL module is out of lock, PLL start-up timer is running or PLL is disabled
bit 4
Unimplemented: Read as ‘0’
bit 3
CF: Clock Fail Detect bit
1 = FSCM has detected a clock failure
0 = No clock failure has been detected
bit 2
POSCEN: Primary Oscillator Sleep Enable bit
1 = Primary Oscillator continues to operate during Sleep mode
0 = Primary Oscillator is disabled during Sleep mode
bit 1
SOSCEN: 32 kHz Secondary Oscillator (SOSC) Enable bit
1 = Enables Secondary Oscillator
0 = Disables Secondary Oscillator
bit 0
OSWEN: Oscillator Switch Enable bit
1 = Initiates an oscillator switch to a clock source specified by the NOSC<2:0> bits
0 = Oscillator switch is complete
Note 1:
2:
3:
4:
Reset values for these bits are determined by the FNOSCx Configuration bits.
The state of the IOLOCK bit can only be changed once an unlocking sequence has been executed. In
addition, if the IOL1WAY Configuration bit is ‘1’ once the IOLOCK bit is set, it cannot be cleared.
This bit also resets to ‘0’ during any valid clock switch or whenever a non-PLL Clock mode is selected.
The default divisor of the postscaler is 2, which will generate a 4 MHz clock to the PLL module.
DS30010089C-page 180
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 9-2:
CLKDIV: CLOCK DIVIDER REGISTER
R/W-0
R/W-0
R/W-1
R/W-1
R/W-0
R/W-0
R/W-0
R/W-1
ROI
DOZE2
DOZE1
DOZE0
DOZEN(1)
RCDIV2
RCDIV1
RCDIV0
bit 15
bit 8
R/W-0
R/W-0
R/W-0
U-0
U-0
U-0
U-0
U-0
CPDIV1
CPDIV0
PLLEN
—
—
—
—
—
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
ROI: Recover on Interrupt bit
1 = Interrupts clear the DOZEN bit and reset the CPU peripheral clock ratio to 1:1
0 = Interrupts have no effect on the DOZEN bit
bit 14-12
DOZE<2:0>: CPU Peripheral Clock Ratio Select bits
111 = 1:128
110 = 1:64
101 = 1:32
100 = 1:16
011 = 1:8 (default)
010 = 1:4
001 = 1:2
000 = 1:1
bit 11
DOZEN: Doze Enable bit(1)
1 = DOZE<2:0> bits specify the CPU peripheral clock ratio
0 = CPU peripheral clock ratio is set to 1:1
bit 10-8
RCDIV<2:0>: FRC Postscaler Select bits
111 = 31.25 kHz (divide-by-256)
110 = 125 kHz (divide-by-64)
101 = 250 kHz (divide-by-32)
100 = 500 kHz (divide-by-16)
011 = 1 MHz (divide-by-8)
010 = 2 MHz (divide-by-4)
001 = 4 MHz (divide-by-2) (default)
000 = 8 MHz (divide-by-1)
bit 7-6
CPDIV<1:0>: System Clock Select bits (postscaler select from fast PLL branch)
11 = 4 MHz (divide-by-8)(2)
10 = 8 MHz (divide-by-4)(2)
01 = 16 MHz (divide-by-2)
00 = 32 MHz (divide-by-1)
bit 5
PLLEN: USB PLL Enable bit
1 = PLL is always active
0 = PLL is only active when a PLL Oscillator mode is selected (OSCCON<14:12> = 011 or 001)
bit 4-0
Unimplemented: Read as ‘0’
Note 1:
2:
This bit is automatically cleared when the ROI bit is set and an interrupt occurs.
This setting is not allowed while the USB module is enabled.
 2015 Microchip Technology Inc.
DS30010089C-page 181
PIC24FJ256GA412/GB412 FAMILY
REGISTER 9-3:
R/W-0
OSCTUN: FRC OSCILLATOR TUNE REGISTER
U-0
STEN
—
R/W-0
STSIDL
R/W-0
STSRC
(1)
R-0
R/W-0
R-0
R/W-0
STLOCK
STLPOL
STOR
STORPOL
bit 15
bit 8
U-0
U-0
—
—
R/W-0
TUN5
(2)
R/W-0
(2)
TUN4
R/W-0
(2)
TUN3
R/W-0
TUN2
R/W-0
(2)
TUN1
(2)
R/W-0
TUN0(2)
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
STEN: FRC Self-Tune Enable bit
1 = FRC self-tuning is enabled; TUNx bits are controlled by hardware
0 = FRC self-tuning is disabled; application may optionally control TUNx bits
bit 14
Unimplemented: Read as ‘0’
bit 13
STSIDL: FRC Self-Tune Stop in Idle bit
1 = Self-tuning stops during Idle mode
0 = Self-tuning continues during Idle mode
bit 12
STSRC: FRC Self-Tune Reference Clock Source bit(1)
1 = FRC is tuned to approximately match the USB host clock tolerance
0 = FRC is tuned to approximately match the 32.768 kHz SOSC tolerance
bit 11
STLOCK: FRC Self-Tune Lock Status bit
1 = FRC accuracy is currently within ±0.2% of the STSRC reference accuracy
0 = FRC accuracy may not be within ±0.2% of the STSRC reference accuracy
bit 10
STLPOL: FRC Self-Tune Lock Interrupt Polarity bit
1 = A self-tune lock interrupt is generated when STLOCK is ‘0’
0 = A self-tune lock interrupt is generated when STLOCK is ‘1’
bit 9
STOR: FRC Self-Tune Out of Range Status bit
1 = STSRC reference clock error is beyond the range of TUN<5:0>; no tuning is performed
0 = STSRC reference clock is within the tunable range; tuning is performed
bit 8
STORPOL: FRC Self-Tune Out of Range Interrupt Polarity bit
1 = A self-tune out of range interrupt is generated when STOR is ‘0’
0 = A self-tune out of range interrupt is generated when STOR is ‘1’
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
TUN<5:0>: FRC Oscillator Tuning bits(2)
011111 = Maximum frequency deviation
011110 =

000001 =
000000 = Center frequency, oscillator is running at factory calibrated frequency
111111 =

100001 =
100000 = Minimum frequency deviation
Note 1:
2:
Use of either clock tuning reference source has specific application requirements. See Section 9.5 “FRC
Active Clock Tuning” for details.
These bits are read-only when STEN = 1.
DS30010089C-page 182
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
9.4
Clock Switching Operation
With few limitations, applications are free to switch
between any of the four clock sources (POSC, SOSC,
FRC and LPRC) under software control and at any
time. To limit the possible side effects that could result
from this flexibility, PIC24F devices have a safeguard
lock built into the switching process.
Note:
9.4.1
The Primary Oscillator mode has three
different submodes (XT, HS and EC)
which are determined by the POSCMODx
Configuration bits. While an application
can switch to and from Primary Oscillator
mode in software, it cannot switch
between the different primary submodes
without reprogramming the device.
ENABLING CLOCK SWITCHING
To enable clock switching, the FCKSMx Configuration
bits in the FOSC Configuration Word must be programmed. (Refer to Section 33.1 “Configuration
Bits” for further details.) If the bits are unmodified, the
clock switching function and Fail-Safe Clock Monitor
function are disabled; this is the default setting.
The NOSCx control bits (OSCCON<10:8>) do not control
the clock selection when clock switching is disabled.
However, the COSC<2:0> bits (OSCCON<14:12>) will
reflect the clock source selected by the FNOSCx
Configuration bits.
The OSWEN control bit (OSCCON<0>) has no effect
when clock switching is disabled; it is held at ‘0’ at all
times.
9.4.2
OSCILLATOR SWITCHING
SEQUENCE
At a minimum, performing a clock switch requires this
basic sequence:
1.
2.
3.
4.
5.
If desired, read the COSC<2:0> bits
(OSCCON<14:12>) to determine the current
oscillator source.
Perform the unlock sequence to allow a write to
the OSCCON register high byte.
Write the appropriate value to the NOSCx bits
(OSCCON<10:8>) for the new oscillator source.
Perform the unlock sequence to allow a write to
the OSCCON register low byte.
Set the OSWEN bit to initiate the oscillator
switch.
 2015 Microchip Technology Inc.
Once the basic sequence is completed, the system
clock hardware responds automatically as follows:
1.
2.
3.
4.
5.
6.
The clock switching hardware compares the
COSCx bits with the new value of the NOSCx
bits. If they are the same, then the clock switch
is a redundant operation. In this case, the
OSWEN bit is cleared automatically and the
clock switch is aborted.
If a valid clock switch has been initiated, the
LOCK (OSCCON<5>) and CF (OSCCON<3>)
bits are cleared.
The new oscillator is turned on by the hardware
if it is not currently running. If a crystal oscillator
must be turned on, the hardware will wait until
the OST expires. If the new source is using the
PLL, then the hardware waits until a PLL lock is
detected (LOCK = 1).
The hardware waits for 10 clock cycles from the
new clock source and then performs the clock
switch.
The hardware clears the OSWEN bit to indicate
a successful clock transition. In addition, the
NOSCx bits value is transferred to the COSCx
bits.
The old clock source is turned off at this time,
with the exception of LPRC (if WDT or FSCM is
enabled) or SOSC (if SOSCEN remains set).
Note 1: The processor will continue to execute
code throughout the clock switching
sequence. Timing-sensitive code should
not be executed during this time.
2: Direct clock switches between any
Primary Oscillator mode with PLL and
FRCPLL mode are not permitted. This
applies to clock switches in either direction. In these instances, the application
must switch to FRC mode as a transitional
clock source between the two PLL modes.
DS30010089C-page 183
PIC24FJ256GA412/GB412 FAMILY
A recommended code sequence for a clock switch
includes the following:
1.
2.
3.
4.
5.
6.
7.
8.
Disable interrupts during the OSCCON register
unlock and write sequence.
Execute the unlock sequence for the OSCCON
high byte by writing 78h and 9Ah to
OSCCON<15:8> in two back-to-back instructions.
Write the new oscillator source to the NOSCx
bits in the instruction immediately following the
unlock sequence.
Execute the unlock sequence for the OSCCON
low byte by writing 46h and 57h to
OSCCON<7:0> in two back-to-back instructions.
Set the OSWEN bit in the instruction immediately
following the unlock sequence.
Continue to execute code that is not clock-sensitive
(optional).
Invoke an appropriate amount of software delay
(cycle counting) to allow the selected oscillator
and/or PLL to start and stabilize.
Check to see if OSWEN is ‘0’. If it is, the switch
was successful. If OSWEN is still set, then
check the LOCK bit to determine the cause of
the failure.
The core sequence for unlocking the OSCCON register
and initiating a clock switch is shown in Example 9-1.
EXAMPLE 9-1:
BASIC CODE SEQUENCE
FOR CLOCK SWITCHING
;Place the new oscillator selection in W0
;OSCCONH (high byte) Unlock Sequence
MOV
#OSCCONH, w1
MOV
#0x78, w2
MOV
#0x9A, w3
MOV.b
w2, [w1]
MOV.b
w3, [w1]
;Set new oscillator selection
MOV.b
WREG, OSCCONH
;OSCCONL (low byte) unlock sequence
MOV
#OSCCONL, w1
MOV
#0x46, w2
MOV
#0x57, w3
MOV.b
w2, [w1]
MOV.b
w3, [w1]
;Start oscillator switch operation
BSET
OSCCON,#0
9.5
FRC Active Clock Tuning
PIC24FJ256GA412/GB412 family devices include an
automatic mechanism to calibrate the FRC during run
time. This system uses active clock tuning from a source
of known accuracy to maintain the FRC within a very
narrow margin of its nominal 8 MHz frequency. This
allows for a frequency accuracy that is well within the
requirements of the “USB 2.0 Specification”, regarding
full-speed USB devices.
Note:
The self-tune feature maintains sufficient
accuracy for operation in USB Device
mode. For applications that function as a
USB host, a high-accuracy clock source
(±0.05%) is still required.
The self-tune system is controlled by the bits in the
upper half of the OSCTUN register. Setting the STEN
bit (OSCTUN<15>) enables the self-tuning feature,
allowing the hardware to calibrate to a source selected
by the STSRC bit (OSCTUN<12>). When STSRC = 1,
the system uses the Start-of-Frame (SOF) packets
from an external USB host for its source. When
STSRC = 0, the system uses the crystal-controlled
SOSC for its calibration source. Regardless of the
source, the system uses the TUN<5:0> bits
(OSCTUN<5:0>) to change the FRC Oscillator’s
frequency. Frequency monitoring and adjustment is
dynamic, occurring continuously during run time. While
the system is active, the TUNx bits cannot be written to
by software.
Note:
To use the USB as a reference clock
tuning source (STSRC = 1), the microcontroller must be configured for USB
device operation and connected to a
non-suspended USB host or hub port.
If the SOSC is to be used as the reference
clock tuning source (STSRC = 0), the
SOSC must also be enabled for clock
tuning to occur.
The self-tune system can generate a hardware
interrupt, FSTIF. The interrupt can result from a drift of
the FRC from the reference by greater than 0.2%, in
either direction, or whenever the frequency deviation is
beyond the ability of the TUNx bits to correct (i.e.,
greater than 1.5%). The STLOCK and STOR status
bits (OSCTUN<11,9>) are used to indicate these
conditions.
The STLPOL and STORPOL bits (OSCTUN<10,8>)
configure the FSTIF interrupt to occur in the presence
or the absence of the conditions. It is the user’s responsibility to monitor both the STLOCK and STOR bits to
determine the exact cause of the interrupt.
Note:
DS30010089C-page 184
The STLPOL and STORPOL bits should
be ignored when the self-tune system is
disabled (STEN = 0).
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
9.6
PLL Block
PIC24FJ256GA412/GB412 family devices include a
versatile PLL block as part of the clock generation
system. This allows for economical high-speed operation up to FOSCMAX (32 MHz) without the need of an
external HS crystal for most applications. It also provides
the option to generate a high-precision 48 MHz clock for
USB operation, without regard for the system clock
frequency. The PLL block is shown in Figure 9-2.
The PLL block has two separate branches:
• A Fixed PLL branch that multiplies the input clock
frequency by a factor of 4, 6 or 8. The output
frequency is provided as the system clock, as well
as an input for the reference clock.
• A 96 MHz PLL that multiplies the input frequency
to 96 MHz. The PLL is able to generate a system
clock output of 4 MHz, 8 MHz, 16 MHz or 32 MHz.
In USB devices, this branch also generates the
48 MHz full-speed USB clock. The 96 MHz output
is provided directly as an input for the reference
clock.
The fixed PLL multiplier is selected by the
PLLMODE<3:0> Configuration bits. As it does not
automatically sense the input frequency, the user must
select a frequency that will not result in an output
frequency greater than 32 MHz.
The 96 MHz PLL branch does not automatically sense
the incoming oscillator frequency. The user must
manually configure the PLL for the input frequency in
order to generate the 96 MHz output, using the
PLLMODE<3:0> Configuration bits. This limits the
choices for input frequencies to a total of 8 possibilities,
shown in Table 9-2. The CPDIV<1:0> bits independently
select the system clock speed; available clock options
are listed in Table 9-3.
TABLE 9-2:
Input Oscillator
Frequency
The PLL block uses either the Primary Oscillator or the
FRC as its input source, as selected by the
COSC<2:0> or NOSC<2:0> oscillator select bits. For
both PLL branches, the minimum input frequency is
4 MHz. For the FRC, the only valid input options are
4 MHz or 8 MHz. The input from the Primary Oscillator
can range from up to 48 MHz, in 4 MHz increments.
PLL Multiplier
(PLLMODE<3:0>)
Clock Mode
48 MHz
ECPLL
2 (0111)
32 MHz
HSPLL, ECPLL
3 (0110)
24 MHz
HSPLL, ECPLL
4 (0101)
20 MHz
HSPLL, ECPLL
4.8 (0100)
16 MHz
HSPLL, ECPLL
6 (0011)
12 MHz
HSPLL, ECPLL
8 (0010)
8 MHz
ECPLL, XTPLL,
FRCPLL(1)
12 (0001)
4 MHz
ECPLL, XTPLL,
FRCPLL(1)
24 (0000)
Note 1:
FIGURE 9-2:
VALID OSCILLATOR INPUTS
FOR 96 MHz PLL
This requires the use of the FRC self-tune
feature to maintain required clock accuracy.
PLL SYSTEM BLOCK
PLL Output
for REFO
PLLMODE<3:0>
PLL Output
for System Clock
x4/6/8
PLL
Input from
POSC
(4-48 MHz)
Input from
FRC
(4 or 8 MHz)
(Note 1)
PLLMODE<3:0>
CPU
Divider
96 MHz
PLL
8
4
2
1
11
10
01
00
3
PLLMODE3
CPDIV<1:0>
2
48 MHz Clock
for USB Module
Note 1: This MUX is controlled by the COSC<2:0> bits when running from the PLL or the NOSC<2:0> bits when
preparing to switch to the PLL.
 2015 Microchip Technology Inc.
DS30010089C-page 185
PIC24FJ256GA412/GB412 FAMILY
TABLE 9-3:
SYSTEM CLOCK OPTIONS
WITH 96 MHz PLL
MCU Clock Division
(CPDIV<1:0>)
Microcontroller
Clock Frequency
None (00)
32 MHz
2 (01)
16 MHz
4 (10)(1)
8 MHz
8 (11)(1)
4 MHz
Note 1:
9.6.1
This is not compatible with USB operation. The
USB module must be disabled to use this
system clock option.
CONSIDERATIONS FOR USB
OPERATION
The 96 MHz PLL branch allows for the generation of a
USB clock signal that meets the timing requirements of
the USB specification. However, some limitations,
including the use of a crystal-controlled clock source
during Host operation, must also be met to meet the
timing requirements. When using the USB On-The-Go
module in PIC24FJ256GB412 family devices, users
must always observe these rules in configuring the
system clock:
• Only the Crystal Oscillator modes listed in
Table 9-2 can be used for USB operation. There is
no provision to provide a separate external clock
source to the USB module.
• The selected clock source (EC, HS or XT) must
meet the USB clock tolerance requirements.
• When the FRCPLL Oscillator mode is used for
USB applications, the FRC self-tune system
should be used as well. While the FRC is
accurate, the only two ways to ensure the level of
accuracy required by the “USB 2.0 Specification”,
throughout the application’s operating range, are
either the self-tune system or manually changing
the TUN<5:0> bits.
• The user must always ensure that the FRC
source is configured to provide a frequency of
4 MHz or 8 MHz (RCDIV<2:0> = 001 or 000) and
that the 96 MHz PLL is configured appropriately.
• All other oscillator modes are available; however,
USB operation is not possible when these modes
are selected. They may still be useful in cases
where other power levels of operation are
desirable and the USB module is not needed
(e.g., the application is Sleeping and waiting for a
bus attachment).
DS30010089C-page 186
9.7
9.7.1
Secondary Oscillator
BASIC SOSC OPERATION
PIC24FJ256GA412/GB412 family devices do not have
to set the SOSCEN bit to use the Secondary Oscillator.
Any module requiring the SOSC (such as RTCC,
Timer1 or DSWDT) will automatically turn on the SOSC
when the clock signal is needed. The SOSC, however,
has a long start-up time (as long as 1 second).To avoid
delays for peripheral start-up, the SOSC can be
manually started using the SOSCEN bit.
To use the Secondary Oscillator, the SOSCSEL Configuration bit (FOSC<3>) must be set to ‘1’. Programming
the SOSCSEL bit to ‘0’ configures the SOSC pins for
Digital mode, enabling digital I/O functionality on the
pins.
9.7.2
CRYSTAL SELECTION
The 32.768 kHz crystal used for the SOSC must have
the following specifications in order to properly start up
and run at the correct frequency:
• 12.5 pF loading capacitance
• 1.0 pF shunt capacitance
• A typical ESR of 50 kΩ; 70 kΩ maximum
In addition, the two external crystal loading capacitors
should be in the range of 22-27 pF, which will be based
on the PC board layout. The capacitors should be C0G,
5% tolerance and rated 25V or greater.
The accuracy and duty cycle of the SOSC can be
measured on the REFO pin and is recommended to be
in the range of 40-60% and accurate to ±0.65 Hz.
Note:
Do not enable the LCD Segment pin,
SEG17, on RD0 when using the 64-pin
package if the SOSC is used for
time-sensitive
applications.
Avoid
high-frequency traces adjacent to the
SOSCO and SOSCI pins as this can
cause errors in the SOSC frequency
and/or duty cycle.
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
9.8
Reference Clock
In addition to the CLKO output (FOSC/2), available in
certain oscillator modes, the device clock in the
PIC24FJ256GA412/GB412 family devices can also be
configured to provide a reference clock output signal to
a port pin. This feature is available in all oscillator configurations and allows the user to select a greater range
of clock submultiples to drive external devices in the
application.
This reference clock output is controlled by the
REFOCONL register (Register 9-4). Setting the
ROEN bit (REFOCON<15>) makes the clock signal
available on the REFO pin. The ROSEL<3:0> bits
(REFOCONL<3:0>) determine which clock source is
used for the reference clock output.
The REFOCONH and REFOTRIML registers
(Register 9-5 and Register 9-6) select the divider from
the selected clock input source from a wide range of
options. The RODIV<14:0> bits (REFOCONH<14:0>)
enable the selection of integer clock divider options,
from 1:1 to 1:65,534. The ROTRIM<8:0> bits
(REFOTRIM<15:7>) allow the user to add a fractional
submultiple of the clock input to the RODIVx value.
The ROSWEN bit (REFOCONL<9>) indicates that the
clock divider is currently being switched. In order to
change the values of the RODIVx or ROTRIMx bits:
1.
2.
3.
Verify that ROSWEN is clear
Write the updated values to the ROTRIMx and
RODIVx bits.
Set the ROSWEN bit, then wait until it is clear
before assuming that the REFO clock is valid.
FIGURE 9-3:
The ROSLP bit (REFOCONL<11>) determines if the
reference source is available on REFO when the
device is in Sleep mode.To use the reference clock output in Sleep mode, the ROSLP bit must be set and the
clock selected by the ROSELx bits must be enabled for
operation during Sleep mode, if possible. Clearing the
ROSELx bits allows the reference output frequency
to change as the system clock changes during any
clock switches. The ROOUT bit enables/disables the
reference clock output on the REFO pin.
The ROACTIV bit (REFOCONL<8>) indicates that the
module is active; it can be cleared by disabling the
module (ROEN = 0). The user must not change the reference clock source, or adjust the trim or divider when
the ROACTIV bit indicates that the module is active. To
avoid glitches, the user should not disable the module
until the ROACTIV bit is ‘1’.
9.8.1
REMAPPABLE OUTPUT
For PIC24FJ256GA412/GB412 family devices, the reference clock output is not available as a dedicated pin
function. Instead, it is made available as an optional
remappable digital output. If the reference clock output is
required for an external consumer, it must be mapped to
an available output pin. See Section 11.4.3.2 “Output
Mapping” for more information.
When REFO is mapped to RP29 (RB15 pin), a reference clock frequency of up to 32 MHz may be used.
The drive strength on this pin is also compatible with
the fixed REFO pin on previous PIC24F devices. If
REFO is mapped to any other output pin, the maximum
reference clock frequency is limited to 16 MHz, with a
lower drive strength.
SIMPLIFIED REFERENCE CLOCK BLOCK DIAGRAM
REFI
Primary Osc
Secondary Osc
PLL Block Output
FRC
LPRC
CPU Clock
Peripheral Clock
REFO
Trim
Divisor
RODIV<14:0>
ROTRIM<8:0>
ROOUT
ROSEL<3:0>
 2015 Microchip Technology Inc.
Divide-by-n
To Other
Peripherals
DS30010089C-page 187
PIC24FJ256GA412/GB412 FAMILY
REGISTER 9-4:
REFOCONL: REFERENCE CLOCK CONTROL LOW REGISTER
R/W-0
U-0
R/W-0
R/W-0
R/W-0
U-0
R/W-0, HC
R-0, HSC
ROEN
—
ROSIDL
ROOUT
ROSLP
—
ROSWEN
ROACTIV
bit 15
bit 8
U-0
U-0
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
—
—
ROSEL3
ROSEL2
ROSEL1
ROSEL0
bit 7
bit 0
Legend:
HC = Hardware Clearable bit
HSC = Hardware Settable/Clearable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
ROEN: Reference Clock Enable bit
1 = Reference Oscillator is enabled on the REFO pin
0 = Reference Oscillator is disabled
bit 14
Unimplemented: Read as ‘0’
bit 13
ROSIDL: Reference Clock Stop in Idle bit
1 = Reference Oscillator continues to run in Idle mode
0 = Reference Oscillator is disabled in Idle mode
bit 12
ROOUT: Reference Clock Output Enable bit
1 = Reference clock external output is enabled and available on the REFO pin
0 = Reference clock external output is disabled
bit 11
ROSLP: Reference Clock Stop in Sleep bit
1 = Reference Oscillator continues to run in Sleep modes
0 = Reference Oscillator is disabled in Sleep
bit 10
Unimplemented: Read as ‘0’
bit 9
ROSWEN: Reference Clock Output Enable bit
1 = Clock divider change (requested by changes to ROTRIMx and/or RODIVx) is requested or is in
progress (set in software, cleared by hardware upon completion)
0 = Clock divider change has completed or is not pending
bit 8
ROACTIV: Reference Clock Status bit
1 = Reference clock is active; do not change clock source
0 = Reference clock is stopped; clock source and configuration may be safely changed
bit 7-4
Unimplemented: Read as ‘0’
bit 3-0
ROSEL<3:0>: Reference Clock Source Select bits
1111 =
   = Reserved
1001 =
1000 = REFI pin
0111 = Reserved
0110 = PLL block (Fixed PLL output frequency or 96 MHz PLL output)
0101 = Secondary Oscillator
0100 = LPRC
0011 = FRC
0010 = Primary Oscillator
0001 = Peripheral clock (FCY)
0000 = CPU clock
DS30010089C-page 188
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 9-5:
U-0
REFOCONH: REFERENCE CLOCK CONTROL HIGH REGISTER
R/W-0
R/W-0
R/W-0
—
R/W-0
R/W-0
R/W-0
R/W-0
RODIV<14:8>
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
RODIV<7:0>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
Unimplemented: Read as ‘0’
bit 14-0
RODIV<14:0>: Reference Clock Integer Divisor Select bits
Divisor for the selected input clock source is two times the selected value.
111 1111 1111 1111 = Base clock value divided by 65,534 (2 * 7FFFh)
111 1111 1111 1110 = Base clock value divided by 65,532 (2 * 7FFEh)
111 1111 1111 1101 = Base clock value divided by 65,530 (2 * 7FFDh)
......
000 0000 0000 0010 = Base clock value divided by 4 (2 * 2)
000 0000 0000 0001 = Base clock value divided by 2 (2 * 1)
000 0000 0000 0000 = Base clock value
REGISTER 9-6:
R/W-0
REFOTRIM: REFERENCE CLOCK TRIM REGISTER
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
ROTRIM<8:1>
bit 15
bit 8
R/W-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
ROTRIM0
—
—
—
—
—
—
—
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-7
ROTRIM<8:0>: Reference Clock Fractional Divisor Select bits
Added fractional portion of the divisor for the selected input clock source is the value, divided by 512.
111111111 = 1 (512/512)
111111110 = 0.998947 (511/512)
111111101 = 0.996094 (510/512)
......
000000010 = 0.003906 (2/512)
000000001 = 0.001953 (1/512)
000000000 = No fractional portion (0/512)
bit 6-0
Unimplemented: Read as ‘0’
 2015 Microchip Technology Inc.
DS30010089C-page 189
PIC24FJ256GA412/GB412 FAMILY
NOTES:
DS30010089C-page 190
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
10.0
POWER-SAVING FEATURES
Note:
This data sheet summarizes the features of
this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to
the “dsPIC33/PIC24 Family Reference
Manual”, “Power-Saving Features with
Deep Sleep” (DS39727).
The PIC24FJ256GA412/GB412 family of devices
provides the ability to manage power consumption by
selectively managing clocking to the CPU and the
peripherals. In general, a lower clock frequency and a
reduction in the number of circuits being clocked
reduces consumed power.
PIC24FJ256GA412/GB412 family devices manage
power consumption with five strategies:
•
•
•
•
•
Instruction-Based Power Reduction Modes
Hardware-Based Power Reduction Features
Clock Frequency Control
Software Controlled Doze Mode
Selective Peripheral Control in Software
10.1
Overview of Power-Saving Modes
In addition to full-power operation, otherwise known as
Run mode, the PIC24FJ256GA412/GB412 family of
devices offers three Instruction-Based Power-Saving
modes and one Hardware-Based mode:
•
•
•
•
Idle
Sleep (Sleep and Low-Voltage Sleep)
Deep Sleep (without retention)
VBAT (with and without RTCC)
All four modes can be activated by powering down different functional areas of the microcontroller, allowing
progressive reductions of operating and Idle power
consumption. In addition, three of the modes can be
tailored for more power reduction at a trade-off of some
operating features. Table 10-1 lists all of the operating
modes in order of increasing power savings. Table 10-2
summarizes how the microcontroller exits the different
modes. Specific information is provided in the following
sections.
Combinations of these methods can be used to
selectively tailor an application’s power consumption,
while still maintaining critical application features, such
as timing-sensitive communications.
TABLE 10-1:
OPERATING MODES FOR PIC24FJ256GA412/GB412 FAMILY DEVICES
Active Systems
Mode
Run (default)
Entry
Core
Peripherals
Data RAM
Retention
RTCC(1)
DSGPR0/
DSGPR1
Retention
N/A
Y
Y
Y
Y
Y
Instruction
N
Y
Y
Y
Y
Instruction
N
S(2)
Y
Y
Y
Instruction +
RETEN bit
N
S(2)
Y
Y
Y
Instruction +
DSEN bit
N
N
N
Y
Y
with RTCC
Hardware
N
N
N
Y
Y
w/o RTCC
Hardware +
RTCBAT
Config. bit
N
N
N
N
Y
Idle
Sleep:
Sleep
Low-Voltage Sleep
Deep Sleep:
Deep Sleep
VBAT:
Note 1:
2:
If RTCC is otherwise enabled in firmware.
A select peripheral can operate during this mode from LPRC or some external clock.
 2015 Microchip Technology Inc.
DS30010089C-page 191
PIC24FJ256GA412/GB412 FAMILY
TABLE 10-2:
EXITING POWER-SAVING MODES
Exit Conditions
All
INT0
All
POR
MCLR
RTCC
Alarm
WDT
VDD
Restore(2)
Code
Execution
Resumes
Idle
Y
Y
Y
Y
Y
Y
Y
N/A
Next instruction
Sleep (all modes)
Y
Y
Y
Y
Y
Y
Y
N/A
(1)
N/A
Reset vector
Y
Reset vector
Mode
Interrupts
Resets
Deep Sleep
N
Y
N
Y
Y
Y
VBAT
N
N
N
N
N
N
Note 1:
2:
10.1.1
N
Deep Sleep WDT.
A POR or POR-like Reset results whenever VDD is removed and restored in any mode.
INSTRUCTION-BASED
POWER-SAVING MODES
Three of the power-saving modes are entered through
the execution of the PWRSAV instruction. Sleep mode
stops clock operation and halts all code execution. Idle
mode halts the CPU and code execution, but allows
peripheral modules to continue operation. Deep Sleep
mode stops clock operation, code execution and all
peripherals, except RTCC and DSWDT. It also freezes
I/O states and removes power to Flash memory, and
may remove power to SRAM.
The assembly syntax of the PWRSAV instruction is shown
in Example 10-1. Sleep and Idle modes are entered
directly with a single assembler command. Deep Sleep
requires an additional sequence to unlock and enable
the entry into Deep Sleep, which is described in
Section 10.4.1 “Entering Deep Sleep Mode”.
Note:
Y
SLEEP_MODE and IDLE_MODE are
constants defined in the assembler include
file for the selected device.
Sleep and Idle modes can be exited as a result of an
enabled interrupt, WDT time-out or a device Reset.
When the device exits these modes, it is said to
“wake-up”.
EXAMPLE 10-1:
The features enabled with the low-voltage/retention
regulator result in some changes to the way that Sleep
and Deep Sleep modes behave. See Section 10.3
“Sleep Mode” and Section 10.4 “Deep Sleep Mode”
for additional information.
10.1.1.1
Interrupts Coincident with Power
Save Instructions
Any interrupt that coincides with the execution of a
PWRSAV instruction will be held off until entry into Sleep
or Idle mode has completed. The device will then
wake-up from Sleep or Idle mode.
For Deep Sleep mode, interrupts that coincide with the
execution of the PWRSAV instruction may be lost. The
microcontroller resets on leaving Deep Sleep and the
interrupt will be lost.
Interrupts that occur during the Deep Sleep unlock
sequence will interrupt the mandatory five-instruction
cycle sequence timing and cause a failure to enter
Deep Sleep. For this reason, it is recommended to
disable all interrupts during the Deep Sleep unlock
sequence.
PWRSAV INSTRUCTION SYNTAX
// Syntax to enter Sleep mode:
PWRSAV
#SLEEP_MODE
; Put the device into SLEEP mode
//
//Synatx to enter Idle mode:
PWRSAV
#IDLE_MODE
; Put the device into IDLE mode
//
// Syntax to enter Deep Sleep mode:
// First use the unlock sequence to set the DSEN bit (see Example 10-2)
BSET
DSCON, #DSEN
; Enable Deep Sleep
BSET
DSCON, #DSEN
; Enable Deep Sleep(repeat the command)
PWRSAV
#SLEEP_MODE
; Put the device into Deep SLEEP mode
DS30010089C-page 192
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
10.1.2
HARDWARE-BASED
POWER-SAVING MODE
The hardware-based VBAT mode does not require any
action by the user during code development. Instead, it
is a hardware design feature that allows the microcontroller to retain critical data (using the DSGPRx
registers) and maintain the RTCC when VDD is removed
from the application. This is accomplished by supplying
a backup power source to a specific power pin. VBAT
mode is described in more detail in Section 10.5 “VBAT
Mode”.
10.1.3
LOW-VOLTAGE/RETENTION
REGULATOR
PIC24FJ256GA412/GB412 family devices incorporate
a second on-chip voltage regulator, designed to provide power to select microcontroller features at 1.2V,
nominal. This regulator allows features, such as data
RAM and the WDT, to be maintained in power-saving
modes where they would otherwise be inactive, or
maintain them at a lower power than would otherwise
be the case.
The low-voltage/retention regulator is only available
when Sleep mode is invoked. It is controlled by the
LPCFG Configuration bit (FPOR<2>) and in firmware
by the RETEN bit (RCON<12>). LPCFG must be programmed (= 0) and the RETEN bit must be set (= 1) for
the regulator to be enabled.
10.2
Idle Mode
Idle mode provides these features:
• The CPU will stop executing instructions.
• The WDT is automatically cleared.
• The system clock source remains active. By
default, all peripheral modules continue to operate
normally from the system clock source, but can
also be selectively disabled (see Section 10.8
“Selective Peripheral Module Control”).
• If the WDT or FSCM is enabled, the LPRC will
also remain active.
The device will wake from Idle mode on any of these
events:
• Any interrupt that is individually enabled
• Any device Reset
• A WDT time-out
On wake-up from Idle, the clock is reapplied to the CPU
and instruction execution begins immediately, starting
with the instruction following the PWRSAV instruction or
the first instruction in the Interrupt Service Routine
(ISR).
 2015 Microchip Technology Inc.
10.3
Sleep Mode
Sleep mode includes these features:
• The system clock source is shut down. If an
on-chip oscillator is used, it is turned off.
• The device current consumption will be reduced
to a minimum provided that no I/O pin is sourcing
current.
• The I/O pin directions and states are frozen.
• The Fail-Safe Clock Monitor does not operate
during Sleep mode since the system clock source
is disabled.
• The LPRC clock will continue to run in Sleep
mode if the WDT or RTCC, with LPRC as the
clock source, is enabled.
• The WDT, if enabled, is automatically cleared
prior to entering Sleep mode.
• Some device features or peripherals may
continue to operate in Sleep mode. This includes
items, such as the Input Change Notification
(ICN) on the I/O ports or peripherals that use an
external clock input. Any peripheral that requires
the system clock source for its operation will be
disabled in Sleep mode.
The device will wake-up from Sleep mode on any of
these events:
• On any interrupt source that is individually
enabled
• On any form of device Reset
• On a WDT time-out
On wake-up from Sleep, the processor will restart with
the same clock source that was active when Sleep
mode was entered.
10.3.1
LOW-VOLTAGE/RETENTION SLEEP
MODE
Low-Voltage/Retention Sleep mode functions as Sleep
mode with the same features and wake-up triggers.
The difference is that the low-voltage/retention regulator allows Core Digital Logic Voltage (VCORE) to drop to
1.2V nominal. This permits an incremental reduction of
power consumption over what would be required if
VCORE was maintained at a 1.8V (minimum) level.
Low-Voltage Sleep mode requires a longer wake-up
time than Sleep mode, due to the additional time
required to bring VCORE back to 1.8V (known as TREG).
In addition, the use of the low-voltage/retention regulator limits the amount of current that can be sourced to
any active peripherals, such as the RTCC/LCD, etc.
DS30010089C-page 193
PIC24FJ256GA412/GB412 FAMILY
10.4
Deep Sleep Mode
Deep Sleep mode provides the lowest levels of power
consumption available from the Instruction-Based
modes.
Deep Sleep modes have these features:
• The system clock source is shut down. If an
on-chip oscillator is used, it is turned off.
• The device current consumption will be reduced
to a minimum.
• The I/O pin directions and states are frozen.
• The Fail-Safe Clock Monitor does not operate
during Sleep mode since the system clock source
is disabled.
• The LPRC clock will continue to run in Deep
Sleep mode if the WDT, or RTCC with LPRC as
the clock source, is enabled.
• The dedicated Deep Sleep WDT and BOR
systems, if enabled, are used.
• The RTCC and its clock source continue to run, if
enabled. All other peripherals are disabled.
Entry into Deep Sleep mode is completely under
software control. Exit from the Deep Sleep modes can
be triggered from any of the following events:
•
•
•
•
•
POR event
MCLR event
RTCC alarm (if the RTCC is present)
External Interrupt 0
Deep Sleep Watchdog Timer (DSWDT) time-out
10.4.1
Deep Sleep mode is entered by setting the DSEN bit in
the DSCON register and then executing a Sleep
command (PWRSAV #SLEEP_MODE), within one
instruction cycle, to minimize the chance that Deep
Sleep will be spuriously entered.
If the PWRSAV command is not given within one
instruction cycle, the DSEN bit will be cleared by the
hardware and must be set again by the software before
entering Deep Sleep mode. The DSEN bit is also
automatically cleared when exiting Deep Sleep mode.
Note:
To re-enter Deep Sleep after a Deep Sleep
wake-up, allow a delay of at least 3 TCY
after clearing the RELEASE bit.
The sequence to enter Deep Sleep mode is:
1.
2.
3.
4.
5.
If the application requires the Deep Sleep WDT,
enable it and configure its clock source. For
more information on Deep Sleep WDT, see
Section 10.4.5 “Deep Sleep WDT”.
If the application requires Deep Sleep BOR,
enable it by programming the DSBOREN
Configuration bit (FDS<6>).
If the application requires wake-up from Deep
Sleep on RTCC alarm, enable and configure the
RTCC module. For more information on RTCC,
see Section 24.0 “Real-Time Clock and
Calendar (RTCC) with Timestamp”.
If needed, save any critical application context
data by writing it to the DSGPR0 and DSGPR1
registers (optional).
Enable Deep Sleep mode by setting the DSEN
bit (DSCON<15>).
Note:
6.
DS30010089C-page 194
ENTERING DEEP SLEEP MODE
A repeat sequence is required to set the
DSEN bit. The repeat sequence (repeating
the instruction twice) is required to write to
any of the Deep Sleep registers (DSCON,
DSWAKE, DSGPR0, DSGPR1). This is
required to prevent the user from entering
Deep Sleep by mistake. Any write to these
registers has to be done twice to actually
complete the write (see Example 10-2).
Enter Deep Sleep mode by issuing three NOP
commands and then a PWRSAV #0 instruction.
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
Any time the DSEN bit is set, all bits in the DSWAKE
register will be automatically cleared.
EXAMPLE 10-2:
The sequence for exiting Deep Sleep mode is:
1.
THE REPEAT SEQUENCE
Example 1:
MOV
MOV
MOV
#0x8000, W2
W2, DSCON
W2, DSCON
;enable DS
;second write required to
;actually write to DSCON
3.
Example 2:
BSET
NOP
NOP
NOP
BSET
2.
DSCON, #15
DSCON, #15
4.
;enable DS
;(two writes required)
5.
6.
10.4.2
EXITING DEEP SLEEP MODES
Deep Sleep modes exit on any one of the following events:
• POR event on VDD supply. If there is no DSBOR
circuit to re-arm the VDD supply POR circuit, the
external VDD supply must be lowered to the
natural arming voltage of the POR circuit.
• DSWDT time-out. When the DSWDT timer times
out, the device exits Deep Sleep.
• RTCC alarm (if RTCEN = 1).
• Assertion (‘0’) of the MCLR pin.
• Assertion of the INT0 pin (if the interrupt was
enabled before Deep Sleep mode was entered).
The polarity configuration is used to determine the
assertion level (‘0’ or ‘1’) of the pin that will cause
an exit from Deep Sleep mode. Exiting from Deep
Sleep mode requires a change on the INT0 pin
while in Deep Sleep mode.
Note:
Any interrupt pending when entering
Deep Sleep mode is cleared.
Exiting Deep Sleep generally does not retain the state
of the device and is equivalent to a Power-on Reset
(POR) of the device. Exceptions to this include the
RTCC (if present), which remains operational through
the wake-up, the DSGPRx registers and DSWDT.
Wake-up events that occur from the time Deep Sleep
exits, until the time the POR sequence completes, are
not ignored. The DSWAKE register will capture ALL
wake-up events, from setting DSEN to clearing
RELEASE.
 2015 Microchip Technology Inc.
After a wake-up event, the device exits Deep
Sleep and performs a POR. The DSEN bit is
cleared automatically. Code execution resumes
at the Reset vector.
To determine if the device exited Deep Sleep,
read the Deep Sleep bit, DPSLP (RCON<10>).
This bit will be set if there was an exit from Deep
Sleep mode. If the bit is set, clear it.
Determine the wake-up source by reading the
DSWAKE register.
Determine if a DSBOR event occurred during
Deep Sleep mode by reading the DSBOR bit
(DSCON<1>).
If application context data has been saved, read
it back from the DSGPR0 and DSGPR1 registers.
Clear the RELEASE bit (DSCON<0>).
10.4.3
SAVING CONTEXT DATA WITH THE
DSGPRx REGISTERS
As exiting Deep Sleep mode causes a POR, most
Special Function Registers reset to their default POR
values. In addition, because VCORE power is not
supplied in Deep Sleep mode, information in data RAM
may be lost when exiting this mode.
Applications which require critical data to be saved
prior to Deep Sleep may use the Deep Sleep General
Purpose registers, DSGPR0 and DSGPR1, or data
EEPROM (if available). Unlike other SFRs, the contents of these registers are preserved while the device
is in Deep Sleep mode. After exiting Deep Sleep,
software can restore the data by reading the registers
and clearing the RELEASE bit (DSCON<0>).
10.4.4
I/O PINS IN DEEP SLEEP MODES
During Deep Sleep, the general purpose I/O pins retain
their previous states and the Secondary Oscillator
(SOSC) will remain running, if enabled. Pins that are
configured as inputs (TRISx bit is set), prior to entry into
Deep Sleep, remain high-impedance during Deep
Sleep. Pins that are configured as outputs (TRISx bit is
clear), prior to entry into Deep Sleep, remain as output
pins during Deep Sleep. While in this mode, they
continue to drive the output level determined by their
corresponding LATx bit at the time of entry into Deep
Sleep.
DS30010089C-page 195
PIC24FJ256GA412/GB412 FAMILY
Once the device wakes back up, all I/O pins continue to
maintain their previous states, even after the device
has finished the POR sequence and is executing
application code again. Pins configured as inputs
during Deep Sleep remain high-impedance and pins
configured as outputs continue to drive their previous
value. After waking up, the TRISx and LATx registers,
and the SOSCEN bit (OSCCON<1>), are reset. If
firmware modifies any of these bits or registers, the
I/O will not immediately go to the newly configured
states. Once the firmware clears the RELEASE bit
(DSCON<0>), the I/O pins are “released”. This causes
the I/O pins to take the states configured by their
respective TRISx and LATx bit values.
This means that keeping the SOSC running after
waking up requires the SOSCEN bit to be set before
clearing RELEASE.
If the Deep Sleep BOR (DSBOR) is enabled, and a
DSBOR or a true POR event occurs during Deep
Sleep, the I/O pins will be immediately released, similar
to clearing the RELEASE bit. All previous state
information will be lost, including the general purpose
DSGPR0 and DSGPR1 contents.
If a MCLR Reset event occurs during Deep Sleep, the
DSGPRx, DSCON and DSWAKE registers will remain
valid, and the RELEASE bit will remain set. The state
of the SOSC will also be retained. The I/O pins,
however, will be reset to their MCLR Reset state. Since
RELEASE is still set, changes to the SOSCEN bit
(OSCCON<1>) cannot take effect until the RELEASE
bit is cleared.
In all other Deep Sleep wake-up cases, application
firmware must clear the RELEASE bit in order to
reconfigure the I/O pins.
10.4.5
DEEP SLEEP WDT
To enable the DSWDT in Deep Sleep mode, program
the Configuration bit, DSWDTEN (FDS<7>). The
device WDT need not be enabled for the DSWDT to
function. Entry into Deep Sleep modes automatically
resets the DSWDT.
The DSWDT clock source is selected by the
DSWDTOSC Configuration bit (FDS<5>). The postscaler
options are programmed by the DSWDTPS<4:0> Configuration bits (FDS<4:0>). The minimum time-out period
that can be achieved is 1 ms and the maximum is
25.7 days. For more details on DSWDT configuration
options, refer to Section 33.0 “Special Features”.
DS30010089C-page 196
10.4.5.1
Switching Clocks in Deep Sleep
Mode
Both the RTCC and the DSWDT may run from either
SOSC or the LPRC clock source. This allows both the
RTCC and DSWDT to run without requiring both the
LPRC and SOSC to be enabled together, reducing
power consumption.
Running the RTCC from LPRC will result in a loss of
accuracy in the RTCC, of approximately 5 to 10%. If a
more accurate RTCC is required, it must be run from the
SOSC clock source. The RTCC clock source is selected
with the CLKSEL<1:0> bits (RTCCON2L<1:0>).
Under certain circumstances, it is possible for the
DSWDT clock source to be off when entering Deep
Sleep mode. In this case, the clock source is turned on
automatically (if DSWDT is enabled) without the need
for software intervention. However, this can cause a
delay in the start of the DSWDT counters. In order to
avoid this delay when using SOSC as a clock source,
the application can activate SOSC prior to entering
Deep Sleep mode.
10.4.6
CHECKING AND CLEARING THE
STATUS OF DEEP SLEEP
Upon entry into Deep Sleep mode, the status bit,
DPSLP (RCON<10>), becomes set and must be
cleared by the software.
On power-up, the software should read this status bit to
determine if the Reset was due to an exit from Deep
Sleep mode and clear the bit if it is set. Of the four
possible combinations of DPSLP and POR bit states,
three cases can be considered:
• Both the DPSLP and POR bits are cleared. In this
case, the Reset was due to some event other
than a Deep Sleep mode exit.
• The DPSLP bit is clear, but the POR bit is set; this
is a normal POR.
• Both the DPSLP and POR bits are set. This
means that Deep Sleep mode was entered, the
device was powered down and Deep Sleep mode
was exited.
10.4.7
POWER-ON RESETS (PORs)
VDD voltage is monitored to produce PORs. Since
exiting from Deep Sleep mode functionally looks like a
POR, the technique described in Section 10.4.6
“Checking and Clearing the Status of Deep Sleep”
should be used to distinguish between Deep Sleep and
a true POR event. When a true POR occurs, the entire
device, including all Deep Sleep logic (Deep Sleep
registers, RTCC, DSWDT, etc.), is reset.
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
10.5
VBAT Mode
This mode represents the lowest power state that the
microcontroller can achieve and still resume operation.
VBAT mode is automatically triggered when the microcontroller’s main power supply on VDD fails. When this
happens, the microcontroller’s on-chip power switch
connects to a backup power source, such as a battery,
supplied to the VBAT pin. This maintains a few key
systems at an extremely low-power draw until VDD is
restored.
The power supplied on VBAT only runs two systems:
the RTCC and the Deep Sleep Semaphore registers
(DSGPR0 and DSGPR1). To maintain these systems
during a sudden loss of VDD, it is essential to connect a
power source, other than VDD or AVDD, to the VBAT pin.
When the RTCC is enabled, it continues to operate with
the same clock source (SOSC or LPRC) that was
selected prior to entering VBAT mode. There is no provision to switch to a lower power clock source after the
mode switch.
Since the loss of VDD is usually an unforeseen event, it
is recommended that the contents of the Deep Sleep
Semaphore registers be loaded with the data to be
retained at an early point in code execution.
10.5.1
VBAT MODE WITH NO RTCC
By disabling RTCC operation during VBAT mode,
power consumption is reduced to the lowest of all
power-saving modes. This is done by programming the
RTCBAT Configuration bit (FDS<14>) to ‘0’. In this
mode, only the Deep Sleep Semaphore registers are
maintained.
10.5.2
WAKE-UP FROM VBAT MODES
When VDD is restored to a device in VBAT mode, it automatically wakes. Wake-up occurs with a POR, after
which, the device starts executing code from the Reset
vector. All SFRs, except the Deep Sleep Semaphore
registers, are reset to their POR values. IF the RTCC
was not configured to run during VBAT mode, it will
remain disabled and RTCC will not run. Wake-up timing
is similar to that for a normal POR.
 2015 Microchip Technology Inc.
To differentiate a wake-up from VBAT mode from other
POR states, check the VBAT status bit (RCON2<0>). If
this bit is set while the device is starting to execute the
code from the Reset vector, it indicates that there has
been an exit from VBAT mode. The application must
clear the VBAT bit to ensure that future VBAT wake-up
events are captured.
If a POR occurs without a power source connected to
the VBAT pin, the VBPOR bit (RCON2<1>) is set. If this
bit is set on a POR, it indicates that a battery needs to
be connected to the VBAT pin.
In addition, if the VBAT power source falls below the
level needed for Deep Sleep semaphore operation
while in VBAT mode (e.g., the battery has been
drained), the VBPOR bit will be set. VBPOR is also set
when the microcontroller is powered up the very first
time, even if power is supplied to VBAT.
10.5.3
I/O PINS DURING VBAT MODES
All I/O pins switch to Input mode during VBAT mode.
The only exceptions are the SOSCI and SOSCO pins,
which maintain their states if the Secondary Oscillator
is being used as the RTCC clock source. It is the user’s
responsibility to restore the I/O pins to their proper
states, using the TRISx and LATx bits, once VDD has
been restored.
10.5.4
SAVING CONTEXT DATA WITH THE
DSGPRx REGISTERS
As with Deep Sleep mode (i.e., without the
low-voltage/retention regulator), all SFRs are reset to
their POR values after VDD has been restored. Only the
Deep Sleep Semaphore registers are preserved. Applications which require critical data to be saved should
save it in DSGPR0 and DSGPR1.
Note:
If the VBAT mode is not used, it is
recommended to connect the VBAT pin
to VDD.
The POR should be enabled for the reliable operation
of the VBAT.
DS30010089C-page 197
PIC24FJ256GA412/GB412 FAMILY
DSCON: DEEP SLEEP CONTROL REGISTER(1)
REGISTER 10-1:
R/W-0
U-0
U-0
R/W-0
R/W-0
U-0
U-0
U-0
DSEN
—
—
RTCCMD
KEYRAMEN
—
—
—
bit 15
bit 8
U-0
U-0
—
—
U-0
—
U-0
U-0
—
—
R/W-0
R/W-0
(2)
WAKEDIS
DSBOR
R/C-0, HS
RELEASE
bit 7
bit 0
Legend:
C = Clearable bit
HS = Hardware Settable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
x = Bit is unknown
DSEN: Deep Sleep Enable bit
1 = Enters Deep Sleep on execution of PWRSAV #0
0 = Enters normal Sleep on execution of PWRSAV #0
bit 14-13
Unimplemented: Read as ‘0’
bit 12
RTCCMD: RTCC Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 11
KEYRAMEN: Cryptographic Engine Key RAM Deep Sleep Enable bit
1 = Power is maintained to Key RAM during Deep Sleep and VBAT modes
0 = Power is disabled during Deep Sleep and VBAT modes
bit 10-3
Unimplemented: Read as ‘0’
bit 2
WAKEDIS: External Wake-up Source Disable bit
1 = External wake-up source is disabled and ignored during Deep Sleep modes
0 = External wake-up source is enabled and can be used to wake device from Deep Sleep
bit 1
DSBOR: Deep Sleep BOR Event bit(2)
1 = The DSBOR was active and a BOR event was detected during Deep Sleep
0 = The DSBOR was not active, or was active, but did not detect a BOR event during Deep Sleep
bit 0
RELEASE: I/O Pin State Release bit
1 = Upon waking from Deep Sleep, I/O pins maintain their states previous to Deep Sleep entry
0 = Releases I/O pins from their state previous to Deep Sleep entry, and allows their respective TRISx
and LATx bits to control their states
Note 1:
2:
All register bits are reset only in the case of a POR event outside of Deep Sleep mode.
Unlike all other events, a Deep Sleep BOR event will NOT cause a wake-up from Deep Sleep; this
re-arms the POR.
DS30010089C-page 198
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 10-2:
DSWAKE: DEEP SLEEP WAKE-UP SOURCE REGISTER(1)
U-0
U-0
U-0
U-0
U-0
U-0
U-0
R/W-0, HS
—
—
—
—
—
—
—
DSINT0
bit 15
bit 8
R/W-0, HS
U-0
U-0
R/W-0, HS
R/W-0, HS
R/W-0, HS
U-0
U-0
DSFLT
—
—
DSWDT
DSRTCC
DSMCLR
—
—
bit 7
bit 0
Legend:
HS = Hardware Settable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-9
Unimplemented: Read as ‘0’
bit 8
DSINT0: Deep Sleep Interrupt-On-Change bit
1 = Interrupt-On-Change was asserted during Deep Sleep
0 = Interrupt-On-Change was not asserted during Deep Sleep
bit 7
DSFLT: Deep Sleep Fault Detect bit
1 = A Fault occurred during Deep Sleep and some Deep Sleep configuration settings may have been
corrupted
0 = No Fault was detected during Deep Sleep
bit 6-5
Unimplemented: Read as ‘0’
bit 4
DSWDT: Deep Sleep Watchdog Timer Time-out bit
1 = The Deep Sleep Watchdog Timer timed out during Deep Sleep
0 = The Deep Sleep Watchdog Timer did not time out during Deep Sleep
bit 3
DSRTCC: Deep Sleep Real-Time Clock and Calendar Alarm bit
1 = The Real-Time Clock and Calendar triggered an alarm during Deep Sleep
0 = The Real-Time Clock and Calendar did not trigger an alarm during Deep Sleep
bit 2
DSMCLR: Deep Sleep MCLR Event bit
1 = The MCLR pin was active and was asserted during Deep Sleep
0 = The MCLR pin was not active, or was active, but not asserted during Deep Sleep
bit 1-0
Unimplemented: Read as ‘0’
Note 1:
All register bits are cleared when the DSEN (DSCON<15>) bit is set.
 2015 Microchip Technology Inc.
DS30010089C-page 199
PIC24FJ256GA412/GB412 FAMILY
REGISTER 10-3:
RCON2: RESET AND SYSTEM CONTROL REGISTER 2
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
U-0
U-0
U-0
r-0
—
—
—
—
R/CO-1
R/CO-1
VDDBOR(1) VDDPOR(1,2)
R/CO-1
R/CO-0
VBPOR(1,3)
VBAT(1)
bit 7
bit 0
Legend:
r = Reserved bit
CO = Clearable Only bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-5
x = Bit is unknown
Unimplemented: Read as ‘0’
bit 4
Reserved: Maintain as ‘0’
bit 3
VDDBOR: VDD Brown-out Reset Flag bit(1)
1 = A VDD Brown-out Reset has occurred (set by hardware)
0 = A VDD Brown-out Reset has not occurred
bit 2
VDDPOR: VDD Power-on Reset Flag bit(1,2)
1 = A VDD Power-on Reset has occurred (set by hardware)
0 = A VDD Power-on Reset has not occurred
bit 1
VBPOR: VBAT Power-on Reset Flag bit(1,3)
1 = A VBAT POR has occurred (no battery connected to the VBAT pin or VBAT power is below Deep
Sleep semaphore retention level, set by hardware)
0 = A VBAT POR has not occurred
bit 0
VBAT: VBAT Flag bit(1)
1 = A POR exit has occurred while power was applied to the VBAT pin (set by hardware)
0 = A POR exit from VBAT has not occurred
Note 1:
2:
3:
This bit is set in hardware only; it can only be cleared in software.
This indicates a VDD POR. Setting the POR bit (RCON<0>) indicates a VCORE POR.
This bit is set when the device is originally powered up, even if power is present on VBAT.
DS30010089C-page 200
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
10.6
Clock Frequency and Clock
Switching
In Run and Idle modes, all PIC24FJ devices allow for
a wide range of clock frequencies to be selected
under application control. If the system clock configuration is not locked, users can choose low-power or
high-precision oscillators by simply changing the
NOSCx bits. The process of changing a system clock
during operation, as well as limitations to the process,
are discussed in more detail in Section 9.0 “Oscillator
Configuration”.
10.7
Doze Mode
Generally, changing clock speed and invoking one of
the power-saving modes are the preferred strategies
for reducing power consumption. There may be circumstances, however, where this is not practical. For
example, it may be necessary for an application to
maintain uninterrupted synchronous communication,
even while it is doing nothing else. Reducing system
clock speed may introduce communication errors,
while using a power-saving mode may stop
communications completely.
Doze mode is a simple and effective alternative method
to reduce power consumption while the device is still
executing code. In this mode, the system clock
continues to operate from the same source and at the
same speed. Peripheral modules continue to be
clocked at the same speed, while the CPU clock speed
is reduced. Synchronization between the two clock
domains is maintained, allowing the peripherals to
access the SFRs while the CPU executes code at a
slower rate.
Doze mode is enabled by setting the DOZEN bit
(CLKDIV<11>). The ratio between peripheral and
core clock speed is determined by the DOZE<2:0>
bits (CLKDIV<14:12>). There are eight possible
configurations, from 1:1 to 1:128, with 1:8 being the
default.
It is also possible to use Doze mode to selectively reduce
power consumption in event-driven applications. This
allows clock-sensitive functions, such as synchronous
communications, to continue without interruption while
the CPU Idles, waiting for something to invoke an interrupt routine. Enabling the automatic return to full-speed
CPU operation on interrupts is enabled by setting the
ROI bit (CLKDIV<15>). By default, interrupt events have
no effect on Doze mode operation.
 2015 Microchip Technology Inc.
10.8
Selective Peripheral Module
Control
Idle and Doze modes allow users to substantially
reduce power consumption by slowing or stopping the
CPU clock. Even so, peripheral modules still remain
clocked, and thus, consume power. There may be
cases where the application needs what these modes
do not provide: the allocation of power resources to the
CPU processing with minimal power consumption from
the peripherals.
PIC24F devices address this requirement by allowing
peripheral modules to be selectively disabled, reducing
or eliminating their power consumption. This can be
done with two control bits:
• The Peripheral Enable bit, generically named,
“XXXEN”, located in the module’s main control
SFR.
• The Peripheral Module Disable (PMD) bit, located
in one of the PMDx registers (Register 10-4
through Register 10-11).
Both bits have similar functions in enabling or disabling
its associated module. Setting the PMDx bit for a module
disables all clock sources to that module, reducing its
power consumption to an absolute minimum. In this
state, the control and status registers associated with the
peripheral will also be disabled, so writes to those
registers will have no effect and read values will be
invalid. Many peripheral modules have a corresponding
PMDx bit.
In contrast, disabling a module by clearing its XXXEN
bit disables its functionality, but leaves its registers
available to be read and written to. Power consumption
is reduced, but not by as much as when the PMDx bits
are used. Most peripheral modules have an enable bit;
exceptions include capture, compare and RTCC.
To achieve more selective power savings, peripheral
modules can also be selectively disabled when the
device enters Idle mode. This is done through the control
bit of the generic name format, “XXXIDL”. By default, all
modules that can operate during Idle mode will do so.
Using the disable on Idle feature disables the module
while in Idle mode, allowing further reduction of power
consumption during Idle mode, enhancing power
savings for extremely critical power applications.
DS30010089C-page 201
PIC24FJ256GA412/GB412 FAMILY
REGISTER 10-4:
PMD1: PERIPHERAL MODULE DISABLE REGISTER 1
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
U-0
U-0
U-0
T5MD
T4MD
T3MD
T2MD
T1MD
—
—
—
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
U-0
U-0
R/W-0
I2C1MD
U2MD
U1MD
SPI2MD
SPI1MD
—
—
ADC1MD
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
T5MD: Timer5 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 14
T4MD: Timer4 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 13
T3MD: Timer3 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 12
T2MD: Timer2 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 11
T1MD: Timer1 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 10-8
Unimplemented: Read as ‘0’
bit 7
I2C1MD: I2C1 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 6
U2MD: UART2 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 5
U1MD: UART1 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 4
SPI2MD: SPI2 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 3
SPI1MD: SPI1 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 2-1
Unimplemented: Read as ‘0’
bit 0
ADC1MD: A/D Converter Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
DS30010089C-page 202
x = Bit is unknown
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 10-5:
PMD2: PERIPHERAL MODULE DISABLE REGISTER 2
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
IC6MD
IC5MD
IC4MD
IC3MD
IC2MD
IC1MD
bit 15
bit 8
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
OC6MD
OC5MD
OC4MD
OC3MD
OC2MD
OC1MD
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-14
Unimplemented: Read as ‘0’
bit 13
IC6MD: Input Capture 6 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 12
IC5MD: Input Capture 5 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 11
IC4MD: Input Capture 4 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 10
IC3MD: Input Capture 3 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 9
IC2MD: Input Capture 2 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 8
IC1MD: Input Capture 1 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 7-6
Unimplemented: Read as ‘0’
bit 5
OC6MD: Output Capture 6 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 4
OC5MD: Output Capture 5 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 3
OC4MD: Output Capture 4 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 2
OC3MD: Output Capture 3 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 1
OC2MD: Output Capture 2 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 0
OC1MD: Output Capture 1 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
 2015 Microchip Technology Inc.
x = Bit is unknown
DS30010089C-page 203
PIC24FJ256GA412/GB412 FAMILY
REGISTER 10-6:
PMD3: PERIPHERAL MODULE DISABLE REGISTER 3
U-0
U-0
U-0
U-0
U-0
R/W-0
U-0
R/W-0
—
—
—
—
—
CMPMD
—
PMPMD
bit 15
bit 8
R/W-0
R/W-0
U-0
U-0
R/W-0
R/W-0
R/W-0
U-0
CRCMD
DACMD
—
—
U3MD
I2C3MD
I2C2MD
—
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-11
Unimplemented: Read as ‘0’
bit 10
CMPMD: Triple Comparator Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 9
Unimplemented: Read as ‘0’
bit 8
PMPMD: Enhanced Parallel Master Port Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 7
CRCMD: CRC Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 6
DACMD: DAC Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 5-4
Unimplemented: Read as ‘0’
bit 3
U3MD: UART3 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 2
I2C3MD: I2C3 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 1
I2C2MD: I2C2 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 0
Unimplemented: Read as ‘0’
DS30010089C-page 204
x = Bit is unknown
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 10-7:
PMD4: PERIPHERAL MODULE DISABLE REGISTER 4
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
U-0
U-0
R/W-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
U4MD
—
REFOMD
CTMUMD
LVDMD
USB1MD
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-6
Unimplemented: Read as ‘0’
bit 5
U4MD: UART4 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 4
Unimplemented: Read as ‘0’
bit 3
REFOMD: Reference Output Clock Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 2
CTMUMD: CTMU Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 1
LVDMD: High/Low-Voltage Detect Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 0
USB1MD: USB On-The-Go Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
 2015 Microchip Technology Inc.
x = Bit is unknown
DS30010089C-page 205
PIC24FJ256GA412/GB412 FAMILY
REGISTER 10-8:
PMD5: PERIPHERAL MODULE DISABLE REGISTER 5
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
CCP7MD
CCP6MD
CCP5MD
CCP4MD
CCP3MD
CCP2MD
CCP1MD
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-7
Unimplemented: Read as ‘0’
bit 6
CCP7MD: SCCP7 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 5
CCP6MD: SCCP6 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 4
CCP5MD: SCCP5 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 3
CCP4MD: MCCP4 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 2
CCP3MD: MCCP3 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 1
CCP2MD: MCCP2 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 0
CCP1MD: MCCP1 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
DS30010089C-page 206
x = Bit is unknown
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 10-9:
PMD6: PERIPHERAL MODULE DISABLE REGISTER 6
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
U-0
R/W-0
U-0
U-0
U-0
U-0
R/W-0
R/W-0
—
LCDMD
—
—
—
—
SPI4MD
SPI3MD
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-7
Unimplemented: Read as ‘0’
bit 6
LCDMD: LCD Controller Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enable
bit 5-2
Unimplemented: Read as ‘0’
bit 1
SPI4MD: SPI4 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 0
SPI3MD: SPI3 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
x = Bit is unknown
REGISTER 10-10: PMD7: PERIPHERAL MODULE DISABLE REGISTER 7
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
U-0
U-0
R/W-0
R/W-0
U-0
U-0
U-0
U-0
—
—
DMA1MD
DMA0MD
—
—
—
—
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-6
Unimplemented: Read as ‘0’
bit 5
DMA1MD: DMA1 Controller (Channels 4 and 5) Disable bit
1 = Controller is disabled
0 = Controller power and clock sources are enabled
bit 4
DMA0MD: DMA0 Controller (Channels 0 through 3) Disable bit
1 = Controller is disabled
0 = Controller power and clock sources are enabled
bit 3-0
Unimplemented: Read as ‘0’
 2015 Microchip Technology Inc.
x = Bit is unknown
DS30010089C-page 207
PIC24FJ256GA412/GB412 FAMILY
REGISTER 10-11: PMD8: PERIPHERAL MODULE DISABLE REGISTER 8
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
U-0
R/W-0
U6MD
U5MD
CLC4MD
CLC3MD
CLC2MD
CLC1MD
—
CRYMD
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-8
Unimplemented: Read as ‘0’
bit 7
U6MD: UART6 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 6
U5MD: UART5 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 5
CLC4MD: CLC4 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 4
CLC3MD: CLC3 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 3
CLC2MD: CLC2 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 2
CLC1MD: CLC1 Module Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
bit 1
Unimplemented: Read as ‘0’
bit 0
CRYMD: Cryptographic Engine Disable bit
1 = Module is disabled
0 = Module power and clock sources are enabled
DS30010089C-page 208
x = Bit is unknown
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
11.0
Note:
I/O PORTS
This data sheet summarizes the features of
this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to the
“dsPIC33/PIC24 Family Reference Manual”, “I/O Ports with Interrupt-On-Change
(IOC)” (DS70005186). The information in
this data sheet supersedes the information
in the FRM.
All of the device pins (except VDD, VSS, MCLR and
OSCI/CLKI) are shared between the peripherals and
the Parallel I/O ports. All I/O input ports feature Schmitt
Trigger (ST) inputs for improved noise immunity.
11.1
Parallel I/O (PIO) Ports
A Parallel I/O port that shares a pin with a peripheral is,
in general, subservient to the peripheral. The peripheral’s output buffer data and control signals are
provided to a pair of multiplexers. The multiplexers
select whether the peripheral or the associated port
has ownership of the output data and control signals of
the I/O pin. The logic also prevents “loop through”, in
which a port’s digital output can drive the input of a
peripheral that shares the same pin. Figure 11-1 shows
how ports are shared with other peripherals and the
associated I/O pin to which they are connected.
FIGURE 11-1:
When a peripheral is enabled and the peripheral is
actively driving an associated pin, the use of the pin as
a general purpose output pin is disabled. The I/O pin
may be read, but the output driver for the parallel port
bit will be disabled. If a peripheral is enabled, but the
peripheral is not actively driving a pin, that pin may be
driven by a port.
All port pins have three registers directly associated
with their operation as digital I/Os and one register
associated with their operation as analog inputs. The
Data Direction register (TRIS) determines whether the
pin is an input or an output. If the data direction bit is a
‘1’, then the pin is an input. All port pins are defined as
inputs after a Reset. Reads from the Output Latch
register (LAT), read the latch; writes to the latch, write
the latch. Reads from the PORT register, read the port
pins; writes to the port pins, write the latch.
Any bit and its associated data and control registers
that are not valid for a particular device will be
disabled. That means the corresponding LAT and
TRIS registers, and the port pin, will read as zeros.
When a pin is shared with another peripheral or function that is defined as an input only, it is regarded as a
dedicated port because there is no other competing
source of inputs.
BLOCK DIAGRAM OF A TYPICAL SHARED PORT STRUCTURE
Peripheral Module
Output Multiplexers
Peripheral Input Data
Peripheral Module Enable
Peripheral Output Enable
Peripheral Output Data
PIO Module
WR TRISx
1
Output Enable
0
1
Output Data
0
Read TRISx
Data Bus
I/O
D
Q
I/O Pin
CK
TRISx Latch
D
WR LATx +
WR PORTx
Q
CK
Data Latch
Read LATx
Input Data
Read PORTx
 2015 Microchip Technology Inc.
DS30010089C-page 209
PIC24FJ256GA412/GB412 FAMILY
11.1.1
11.2
I/O PORT WRITE/READ TIMING
One instruction cycle is required between a port
direction change or port write operation and a read
operation of the same port. Typically, this instruction
would be a NOP.
11.1.2
OPEN-DRAIN CONFIGURATION
In addition to the PORTx, LATx and TRISx registers for
data control, each port pin can also be individually
configured for either a digital or open-drain output. This
is controlled by the Open-Drain Control register, ODCx,
associated with each port. Setting any of the bits configures the corresponding pin to act as an open-drain
output.
The open-drain feature allows the generation of
outputs higher than VDD (e.g., 5V) on any desired
digital only pins by using external pull-up resistors. The
maximum open-drain voltage allowed is the same as
the maximum VIH specification.
Configuring Analog Port Pins
(ANSx)
The ANSx and TRISx registers control the operation of
the pins with analog function. Each port pin with analog
function is associated with one of the ANSx bits (see
Register 11-1 through Register 11-8), which decides if
the pin function should be analog or digital. Refer to
Table 11-1 for detailed behavior of the pin for different
ANSx and TRISx bit settings.
When reading the PORTx register, all pins configured as
analog input channels will read as cleared (a low level).
11.2.1
ANALOG INPUT PINS AND
VOLTAGE CONSIDERATIONS
The voltage tolerance of pins used as device inputs is
dependent on the pin’s input function. Most input pins
are able to handle DC voltages of up to 5.5V, a level typical for digital logic circuits. However, several pins can
only tolerate voltages up to VDD. Voltage excursions
beyond VDD on these pins should always be avoided.
Information on voltage tolerance is provided in the pinout
diagrams in the beginning of this data sheet. For
more information, refer to Section 36.0 “Electrical
Characteristics” for more details.
TABLE 11-1:
CONFIGURING ANALOG/DIGITAL FUNCTION OF AN I/O PIN
Pin Function
Analog Input
ANSx
Setting
TRISx
Setting
1
1
It is recommended to keep ANSx = 1.
Comments
Analog Output
1
1
It is recommended to keep ANSx = 1.
Digital Input
0
1
Firmware must wait at least one instruction cycle after configuring
a pin as a digital input before a valid input value can be read.
Digital Output
0
0
Make sure to disable the analog output function on the pin if any is
present.
DS30010089C-page 210
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 11-1:
R/W-1
ANSA: PORTA ANALOG FUNCTION SELECTION REGISTER(1)
R/W-1
ANSA<15:14>
U-0
U-0
U-0
—
—
—
R/W-1
R/W-1
U-0
ANSA<10:9>
—
bit 15
bit 8
R/W-1
R/W-1
R/W-1
U-0
R/W-1
—
ANSA<7:5>
R/W-1
U-0
R/W-1
—
ANSA0
ANSA<3:2>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-14
ANSA<15:14>: PORTA Analog Function Selection bits
1 = Pin is configured in Analog mode; I/O port read is disabled
0 = Pin is configured in Digital mode; I/O port read is enabled
bit 13-11
Unimplemented: Read as ‘0’
bit 10-9
ANSA<10:9>: PORTA Analog Function Selection bits
1 = Pin is configured in Analog mode; I/O port read is disabled
0 = Pin is configured in Digital mode; I/O port read is enabled
bit 8
Unimplemented: Read as ‘0’
bit 7-5
ANSA<7:5>: PORTA Analog Function Selection bits
1 = Pin is configured in Analog mode; I/O port read is disabled
0 = Pin is configured in Digital mode; I/O port read is enabled
bit 4
Unimplemented: Read as ‘0’
bit 3-2
ANSA<3:2>: PORTA Analog Function Selection bits
1 = Pin is configured in Analog mode; I/O port read is disabled
0 = Pin is configured in Digital mode; I/O port read is enabled
bit 1
Unimplemented: Read as ‘0’
bit 0
ANSA0: PORTA Analog Function Selection bit
1 = Pin is configured in Analog mode; I/O port read is disabled
0 = Pin is configured in Digital mode; I/O port read is enabled
Note 1:
x = Bit is unknown
PORTA pins are not available on 64-pin devices.
 2015 Microchip Technology Inc.
DS30010089C-page 211
PIC24FJ256GA412/GB412 FAMILY
REGISTER 11-2:
R/W-1
ANSB: PORTB ANALOG FUNCTION SELECTION REGISTER
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
ANSB<15:8>
bit 15
bit 8
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
ANSB<7:0>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-0
x = Bit is unknown
ANSB<15:0>: PORTB Analog Function Selection bits
1 = Pin is configured in Analog mode; I/O port read is disabled
0 = Pin is configured in Digital mode; I/O port read is enabled
ANSC: PORTC ANALOG FUNCTION SELECTION REGISTER(1)
REGISTER 11-3:
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
U-0
U-0
U-0
—
—
—
R/W-1
R/W-1
R/W-1
R/W-1
ANSC<4:1>
U-0
—
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-5
Unimplemented: Read as ‘0’
bit 4-1
ANSC<4:1>: PORTC Analog Function Selection bits
1 = Pin is configured in Analog mode; I/O port read is disabled
0 = Pin is configured in Digital mode; I/O port read is enabled
bit 0
Unimplemented: Read as ‘0’
Note 1:
x = Bit is unknown
PORTC pins are not available on 64-pin devices.
DS30010089C-page 212
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 11-4:
R/W-1
ANSD: PORTD ANALOG FUNCTION SELECTION REGISTER
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
ANSD<15:8>(1)
bit 15
bit 8
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
ANSD<7:0>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-0
Note 1:
x = Bit is unknown
ANSD<15:0>: PORTD Analog Function Selection bits(1)
1 = Pin is configured in Analog mode; I/O port read is disabled
0 = Pin is configured in Digital mode; I/O port read is enabled
The ANSD<15:12> bits are not available on 64-pin devices.
REGISTER 11-5:
ANSE: PORTE ANALOG FUNCTION SELECTION REGISTER
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
R/W-1
R/W-1
ANSE<9:8>(1)
bit 15
bit 8
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
ANSE<7:0>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-10
Unimplemented: Read as ‘0’
bit 9-0
ANSE<9:0>: PORTE Analog Function Selection bits(1)
1 = Pin is configured in Analog mode; I/O port read is disabled
0 = Pin is configured in Digital mode; I/O port read is enabled
Note 1:
x = Bit is unknown
The ANSE<9:8> bits are not available on 64-pin devices.
 2015 Microchip Technology Inc.
DS30010089C-page 213
PIC24FJ256GA412/GB412 FAMILY
REGISTER 11-6:
U-0
ANSF: PORTF ANALOG FUNCTION SELECTION REGISTER
U-0
—
—
R/W-1
R/W-1
U-0
U-0
U-0
R/W-1
(1)
—
—
—
ANSF8(1)
ANSF<13:12>
bit 15
bit 8
U-0
U-0
—
—
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
ANSF<5:0>(2)
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-14
Unimplemented: Read as ‘0’
bit 13-12
ANSF<13:12>: PORTF Analog Function Selection bits(1)
1 = Pin is configured in Analog mode; I/O port read is disabled
0 = Pin is configured in Digital mode; I/O port read is enabled
bit 11-9
Unimplemented: Read as ‘0’
bit 8
ANSF8: PORTA Analog Function Selection bit(1)
1 = Pin is configured in Analog mode; I/O port read is disabled
0 = Pin is configured in Digital mode; I/O port read is enabled
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
ANSF<5:0>: PORTA Analog Function Selection bits(2)
1 = Pin is configured in Analog mode; I/O port read is disabled
0 = Pin is configured in Digital mode; I/O port read is enabled
Note 1:
2:
x = Bit is unknown
The ANSF<13:12,8> bits are not available on 64-pin devices.
The ANSF2 bit is not available on PIC24FJXXXGB406 devices.
DS30010089C-page 214
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 11-7:
R/W-1
ANSG: PORTG ANALOG FUNCTION SELECTION REGISTER
R/W-1
R/W-1
R/W-1
ANSG<15:12>(1)
U-0
U-0
—
—
R/W-1
R/W-1
ANSG<9:8>
bit 15
bit 8
R/W-1
R/W-1
ANSG<7:6>
U-0
U-0
U-0
U-0
—
—
—
—
R/W-1
R/W-1
ANSG<1:0>(1)
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-12
ANSG<15:12>: PORTG Analog Function Selection bits(1)
1 = Pin is configured in Analog mode; I/O port read is disabled
0 = Pin is configured in Digital mode; I/O port read is enabled
bit 11-10
Unimplemented: Read as ‘0’
bit 9-6
ANSG<9:6>: PORTG Analog Function Selection bits
1 = Pin is configured in Analog mode; I/O port read is disabled
0 = Pin is configured in Digital mode; I/O port read is enabled
bit 5-2
Unimplemented: Read as ‘0’
bit 1-0
ANSG<1:0>: PORTG Analog Function Selection bits(1)
1 = Pin is configured in Analog mode; I/O port read is disabled
0 = Pin is configured in Digital mode; I/O port read is enabled
Note 1:
x = Bit is unknown
The ANSG<15:12,1:0> bits are not available on 64-pin devices.
REGISTER 11-8:
ANSH: PORTH ANALOG FUNCTION SELECTION REGISTER(1)
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
U-0
U-0
U-0
—
—
—
R/W-1
R/W-1
R/W-1
R/W-1
ANSH<4:1>
U-0
—
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-5
Unimplemented: Read as ‘0’
bit 4-1
ANSH<4:1>: PORTH Analog Function Selection bits
1 = Pin is configured in Analog mode; I/O port read is disabled
0 = Pin is configured in Digital mode; I/O port read is enabled
bit 0
Unimplemented: Read as ‘0’
Note 1:
x = Bit is unknown
PORTH pins are not available on 64-pin and 100-pin devices.
 2015 Microchip Technology Inc.
DS30010089C-page 215
PIC24FJ256GA412/GB412 FAMILY
11.3
Interrupt-On-Change (IOC)
The Interrupt-On-Change function of the I/O ports
allows the PIC24FJ256GA412/GB412 family of
devices to generate interrupt requests to the processor
in response to a Change-of-State (COS) on any of the
input port pins. This feature is capable of detecting
input Change-of-States, even in Sleep mode when the
clocks are disabled.
Interrupt-On-Change functionality is globally enabled
by setting the IOCON bit in the PADCON register
(Register 11-9). Functionality is then enabled for a particular pin by setting the IOCPx and/or IOCNx register
bit for that pin. Setting a value of ‘1’ in the IOCPx register enables interrupts for low-to-high transitions, while
setting a value of ‘1’ in the IOCNx register enables
interrupts for high-to-low transitions. Setting a value of
‘1’ in both register bits will enable interrupts for either
case (e.g., a pulse on the pin will generate two
interrupts).
When an interrupt request is generated for a pin, the
corresponding status flag bit in the IOCFx register will
be set, indicating that a Change-of-State occurred on
that pin. The IOCFx register bit will remain set until
cleared by writing a zero to it. When any IOCFx flag bit
in a given port is set, the corresponding IOCPxF bit in
the IOCSTAT register (Register 11-10) will also be set.
This flag indicates that a change was detected on one
of the bits on the given port. The IOCPxF flag will be
cleared when all IOCFx<15:0> bits are cleared.
Multiple individual status flags can be cleared by writing
a zero to one or more bits using a Read-Modify-Write
operation. If another edge is detected on a pin whose
status bit is being cleared during the Read-Modify-Write
sequence, the associated change flag will still be set at
the end of the Read-Modify-Write sequence.
EXAMPLE 11-1:
MOV
XOR
AND
0xFFFF, W0
IOCFx, W0
IOCFx
EXAMPLE 11-2:
MOV
MOV
NOP
BTSS
0xFF00, W0
W0, TRISB
PORTB, #13
EXAMPLE 11-3:
At the end of this sequence, the W0 register will contain
a zero for each bit for which the port pin had a change
detected. In this way, any indication of a pin changing
will not be lost.
Due to the asynchronous and real-time nature of the
Interrupt-On-Change, the value read on the port pins
may not indicate the state of the port when the change
was detected, as a second change can occur during
the interval between clearing the flag and reading the
port. It is up to the user code to handle this case if it is
a possibility in their application. To keep this interval to
a minimum, it is recommended that any code modifying
the IOCFx registers be run either in the interrupt
handler or with interrupts disabled.
11.3.1
PULL-UPS AND PULL-DOWNS
Each IOC pin has both a weak pull-up and a weak
pull-down connected to it. The pull-ups act as a current
source connected to the pin, while the pull-downs act
as a current sink connected to the pin. These eliminate
the need for external resistors when push button or
keypad devices are connected.
The pull-ups and pull-downs are separately enabled
using the IOCPUx registers (for pull-ups) and the
IOCPDx registers (for pull-downs). Each IOC pin has
individual control bits for its pull-up and pull-down. Setting a control bit enables the weak pull-up or pull-down
for the corresponding pin.
Note:
Pull-ups and pull-downs on pins should
always be disabled whenever the pin is
configured as a digital output.
IOC STATUS READ/CLEAR IN ASSEMBLY
; Initial mask value 0xFFFF -> W0
; W0 has '1' for each bit set in IOCFx
; IOCFx & W0 ->IOCFx
PORT READ/WRITE IN ASSEMBLY
;
;
;
;
Configure PORTB<15:8> as inputs
and PORTB<7:0> as outputs
Delay 1 cycle
Next Instruction
PORT READ/WRITE IN ‘C’
TRISB = 0xFF00;
Nop();
If (PORTBbits.RB13){ };
DS30010089C-page 216
The user should use the instruction sequence (or
equivalent) shown in Example 11-1 to clear the
Interrupt-On-Change Status registers.
// Configure PORTB<15:8> as inputs and PORTB<7:0> as outputs
// Delay 1 cycle
// Next Instruction
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 11-9:
PADCON: PORT CONFIGURATION REGISTER
R/W-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
IOCON
—
—
—
—
—
—
—
bit 15
bit 8
U-0
U-0
U-0
U-0
U-0
U-0
U-0
R/W-0
—
—
—
—
—
—
—
PMPTTL
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
IOCON: Interrupt-On-Change Enable bit
1 = Interrupt-On-Change functionality is enabled
0 = Interrupt-On-Change functionality is disabled
bit 14-1
Unimplemented: Read as ‘0’
bit 0
PMPTTL: EPMP Module TTL Input Buffer Select bit (unused by the GPIO module)
Not used by IOC; see Register 21-9 for definition.
 2015 Microchip Technology Inc.
DS30010089C-page 217
PIC24FJ256GA412/GB412 FAMILY
REGISTER 11-10: IOCSTAT: INTERRUPT-ON-CHANGE STATUS REGISTER
U-0
U-0
U-0
U-0
U-0
U-0
U-0
R-0, HSC
—
—
—
—
—
—
—
IOCPJF(1)
bit 15
bit 8
R-0, HSC
R-0, HSC
R-0, HSC
R-0, HSC
R-0, HSC
R-0, HSC
R-0, HSC
R-0, HSC
IOCPHF(1)
IOCPGF
IOCPFF
IOCPEF
IOCPDF
IOCPCF
IOCPBF
IOCPAF(2)
bit 7
bit 0
Legend:
HSC = Hardware Settable/Clearable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-9
Unimplemented: Read as ‘0’
bit 8
IOCPJF: Interrupt-On-Change PORTJ Flag bit(1)
1 = A change was detected on an IOC-enabled pin on PORTJ
0 = No change was detected or the user has cleared all detected changes
bit 7
IOCPHF: Interrupt-On-Change PORTH Flag bit(1)
1 = A change was detected on an IOC-enabled pin on PORTH
0 = No change was detected or the user has cleared all detected changes
bit 6
IOCPGF: Interrupt-On-Change PORTG Flag bit
1 = A change was detected on an IOC-enabled pin on PORTG
0 = No change was detected or the user has cleared all detected changes
bit 5
IOCPFF: Interrupt-On-Change PORTF Flag bit
1 = A change was detected on an IOC-enabled pin on PORTF
0 = No change was detected or the user has cleared all detected changes
bit 4
IOCPEF: Interrupt-On-Change PORTE Flag bit
1 = A change was detected on an IOC-enabled pin on PORTE
0 = No change was detected or the user has cleared all detected changes
bit 3
IOCPDF: Interrupt-On-Change PORTD Flag bit
1 = A change was detected on an IOC-enabled pin on PORTD
0 = No change was detected or the user has cleared all detected changes
bit 2
IOCPCF: Interrupt-On-Change PORTC Flag bit
1 = A change was detected on an IOC-enabled pin on PORTC
0 = No change was detected or the user has cleared all detected changes
bit 1
IOCPBF: Interrupt-On-Change PORTB Flag bit
1 = A change was detected on an IOC-enabled pin on PORTB
0 = No change was detected or the user has cleared all detected changes
bit 0
IOCPAF: Interrupt-On-Change PORTA Flag bit(2)
1 = A change was detected on an IOC-enabled pin on PORTA
0 = No change was detected, or the user has cleared all detected change
Note 1:
2:
These ports are not available on 64-pin or 100-pin devices.
This port is not available on 64-pin devices.
DS30010089C-page 218
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
11.4
Peripheral Pin Select (PPS)
A major challenge in general purpose devices is providing the largest possible set of peripheral features while
minimizing the conflict of features on I/O pins. In an
application that needs to use more than one peripheral
multiplexed on a single pin, inconvenient work arounds
in application code, or a complete redesign, may be the
only option.
The Peripheral Pin Select (PPS) feature provides an
alternative to these choices by enabling the user’s
peripheral set selection and its placement on a wide
range of I/O pins. By increasing the pinout options
available on a particular device, users can better tailor
the microcontroller to their entire application, rather
than trimming the application to fit the device.
The Peripheral Pin Select feature operates over a fixed
subset of digital I/O pins. Users may independently
map the input and/or output of any one of many digital
peripherals to any one of these I/O pins. PPS is performed in software and generally does not require the
device to be reprogrammed. Hardware safeguards are
included that prevent accidental or spurious changes to
the peripheral mapping once it has been established.
11.4.1
AVAILABLE PINS
A key difference between pin select and non-pin select
peripherals is that pin select peripherals are not associated with a default I/O pin. The peripheral must
always be assigned to a specific I/O pin before it can be
used. In contrast, non-pin select peripherals are always
available on a default pin, assuming that the peripheral
is active and not conflicting with another peripheral.
11.4.2.1
Peripheral Pin Select Function
Priority
Pin-selectable peripheral outputs (e.g., output compare, UART transmit) will take priority over general
purpose digital functions on a pin, such as EPMP and
port I/O. Specialized digital outputs will take priority
over PPS outputs on the same pin. The pin diagrams
list peripheral outputs in the order of priority. Refer to
them for priority concerns on a particular pin.
Unlike PIC24F devices with fixed peripherals,
pin-selectable peripheral inputs will never take ownership of a pin. The pin’s output buffer will be controlled
by the TRISx setting or by a fixed peripheral on the pin.
If the pin is configured in Digital mode, then the PPS
input will operate correctly. If an analog function is
enabled on the pin, the PPS input will be disabled.
11.4.3
CONTROLLING PERIPHERAL PIN
SELECT
The PPS feature is used with a range of up to 44 pins,
depending on the particular device and its pin count.
Pins that support the Peripheral Pin Select feature
include the designation, “RPn” or “RPIn”, in their full pin
designation, where “n” is the remappable pin number.
“RP” is used to designate pins that support both remappable input and output functions, while “RPI” indicates
pins that support remappable input functions only.
PPS features are controlled through two sets of Special
Function Registers (SFRs): one to map peripheral
inputs and one to map outputs. Because they are
separately controlled, a particular peripheral’s input
and output (if the peripheral has both) can be placed on
any selectable function pin without constraint.
PIC24FJ256GA412/GB412 family devices support a
larger number of remappable input only pins than
remappable input/output pins. In this device family,
there are up to 32 remappable input/output pins,
depending on the pin count of the particular device
selected. These pins are numbered: RP0 through
RP31. See Table 1-4 and Table 1-5 for a summary of
pinout options in each package offering.
11.4.3.1
11.4.2
AVAILABLE PERIPHERALS
The peripherals managed by the PPS are all digital
only peripherals. These include general serial communications (UART and SPI), general purpose timer clock
inputs, timer related peripherals (input capture and
output compare) and external interrupt inputs. Also
included are the outputs of the comparator module,
since these are discrete digital signals.
PPS is not available for analog peripherals or these
digital peripherals:
•
•
•
•
I2C (input and output)
RTCC Alarm and Power Gate Outputs
EPMP Signals (input and output)
INT0
 2015 Microchip Technology Inc.
The association of a peripheral to a peripheral-selectable
pin is handled in two different ways, depending on if an
input or an output is being mapped.
Input Mapping
The inputs of the Peripheral Pin Select options are
mapped on the basis of the peripheral; that is, a control
register associated with a peripheral dictates the pin
it will be mapped to. The RPINRx registers
(Register 11-11 through Register 11-30) are used to
configure peripheral input mapping. Each register contains two sets of 6-bit fields, with each set associated
with one of the pin-selectable peripherals. Programming a given peripheral’s bit field with an appropriate
6-bit value maps the RPn/RPIn pin with that value to
that peripheral.
Table 11-2 summarizes the remappable inputs
available with Peripheral Pin Select. For any given
device, the valid range of values for any of the bit fields
corresponds to the maximum number of Peripheral Pin
Selections supported by the device.
Note:
Unless otherwise noted, all remappable
inputs utilize Schmitt Trigger buffers.
DS30010089C-page 219
PIC24FJ256GA412/GB412 FAMILY
TABLE 11-2:
SELECTABLE INPUT SOURCES (MAPS INPUT TO FUNCTION)
Input Name
CCP Clock Input A
CCP Clock Input B
Function Name
Register
Function Mapping Bits
TCKIA
RPINR12<5:0>
TCKIAR<5:0>
TCKIB
RPINR12<13:8>
TCKIBR<5:0>
CLC Input A
CLCINA
RPINR25<5:0>
CLCINAR<5:0>
CLC Input B
CLCINB
RPINR25<13:8>
CLCINBR<5:0>
INT1
RPINR0<13:8>
INT1R<5:0>
External Interrupt 1
External Interrupt 2
INT2
RPINR1<5:0>
INT2R<5:0>
External Interrupt 3
INT3
RPINR1<13:8>
INT3R<5:0>
External Interrupt 4
Generic Timer External input
INT4
RPINR2<5:0>
INT4R<5:0>
TMRCK
RPINR23<13:8>
TXCKR<5:0>
Input Capture 1
IC1
RPINR7<5:0>
IC1R<5:0>
Input Capture 2
IC2
RPINR7<13:8>
IC2R<5:0>
Input Capture 3
Output Compare Fault A
Output Compare Fault B
IC3
RPINR8<5:0>
IC3R<5:0>
OCFA
RPINR11<5:0>
OCFAR<5:0>
OCFB
RPINR11<13:8>
OCFBR<5:0>
Output Compare Trigger 1
OCTRIG1
RPINR0<5:0>
OCTRIG1R<5:0>
Output Compare Trigger 1
OCTRIG2
RPINR2<13:8>
OCTRIG2R<5:0>
SCK1IN
RPINR20<13:8>
SCK1R<5:0>
SPI1 Clock Input
SPI1 Data Input
SDI1
RPINR20<5:0>
SDI1R<5:0>
SPI1 Slave Select
SS1IN
RPINR21<5:0>
SS1R<5:0>
SPI2 Clock Input
SCK2IN
RPINR22<13:8>
SCK2R<5:0>
SPI2 Data Input
SDI2
RPINR22<5:0>
SDI2R<5:0>
SPI2 Slave Select
SS2IN
RPINR23<5:0>
SS2R<5:0>
SPI3 Clock Input
SCK3IN
RPINR28<13:8>
SCK3R<5:0>
SPI3 Data Input
SDI3
RPINR28<5:0>
SDI3R<5:0>
SPI3 Slave Select
SS3IN
RPINR29<5:0>
SS3R<5:0>
Timer2 External Clock
T2CK
RPINR3<5:0>
T2CKR<5:0>
Timer3 External Clock
T3CK
RPINR3<13:8>
T3CKR<5:0>
Timer4 External Clock
T4CK
RPINR4<5:0>
T4CKR<5:0>
Timer5 External Clock
T5CK
RPINR4<13:8>
T5CKR<5:0>
UART1 Clear-to-Send
U1CTS
RPINR18<13:8>
U1CTSR<5:0>
UART1 Receive
UART2 Clear-to-Send
UART2 Receive
UART3 Clear-to-Send
UART3 Receive
UART4 Clear-to-Send
UART4 Receive
DS30010089C-page 220
U1RX
RPINR18<5:0>
U1RXR<5:0>
U2CTS
RPINR19<13:8>
U2CTSR<5:0>
U2RX
RPINR19<5:0>
U2RXR<5:0>
U3CTS
RPINR21<13:8>
U3CTSR<5:0>
U3RX
RPINR17<13:8>
U3RXR<5:0>
U4CTS
RPINR27<13:8>
U4CTSR<5:0>
U4RX
RPINR27<5:0>
U4RXR<5:0>
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
11.4.3.2
Output Mapping
Register 11-46). The value of the bit field corresponds to
one of the peripherals and that peripheral’s output is
mapped to the pin (see Table 11-3).
In contrast to inputs, the outputs of the Peripheral Pin
Select options are mapped on the basis of the pin. In this
case, a control register associated with a particular pin
dictates the peripheral output to be mapped. The RPORx
registers are used to control output mapping. Each
register contains two 6-bit fields, with each field being
associated with one RPn pin (see Register 11-31 through
TABLE 11-3:
Because of the mapping technique, the list of peripherals
for output mapping also includes a null value of ‘000000’.
This permits any given pin to remain disconnected from
the output of any of the pin-selectable peripherals.
SELECTABLE OUTPUT SOURCES (MAPS FUNCTION TO OUTPUT)
Output Function Number(1)
Function
0
NULL(2)
Null
1
C1OUT
Comparator 1 Output
2
C2OUT
Comparator 2 Output
3
U1TX
Note 1:
2:
3:
4:
(3)
4
U1RTS
5
U2TX
6
U2RTS(3)
Output Name
UART1 Transmit
UART1 Request-to-Send
UART2 Transmit
UART2 Request-to-Send
7
SDO1
SPI1 Data Output
8
SCK1OUT
SPI1 Clock Output
9
SS1OUT
10
SDO2
SPI2 Data Output
SPI1 Slave Select Output
SPI2 Clock Output
11
SCK2OUT
12
SS2OUT
13
OC1
Output Compare 1
14
OC2
Output Compare 2
SPI2 Slave Select Output
15
OC3
16
OCM4
SCCP Output Compare 4
Output Compare 3
17
OCM5
SCCP Output Compare 5
18
OCM6
SCCP Output Compare 6
19
U3TX
UART3 Transmit
20
U3RTS
21
U4TX
(3)
UART3 Request-to-Send
UART4 Transmit
UART4 Request-to-Send
22
U4RTS
23
SDO3
SPI3 Data Output
24
SCK3OUT
SPI3 Clock Output
25
SS3OUT
26
C3OUT
Comparator 3 Output
27
OCM7
SCCP Output Compare 7
28
REFO(4)
29
CLC1OUT
CLC1 Output
30
CLC2OUT
CLC2 Output
SPI3 Slave Select Output
Reference Clock Output
Setting the RPORx register with the listed value assigns that output function to the associated RPn pin.
The NULL function is assigned to all RPn outputs at device Reset and disables the RPn output function.
IrDA® BCLK functionality uses this output.
Map to RP29 (RB15) to maintain the high output driver found in previous PIC24F devices.
 2015 Microchip Technology Inc.
DS30010089C-page 221
PIC24FJ256GA412/GB412 FAMILY
11.4.3.3
Mapping Limitations
11.4.4.1
The control schema of the Peripheral Pin Select is
extremely flexible. Other than systematic blocks that
prevent signal contention caused by two physical pins
being configured as the same functional input or two
functional outputs configured as the same pin, there
are no hardware enforced lockouts. The flexibility
extends to the point of allowing a single input to drive
multiple peripherals or a single functional output to
drive multiple output pins.
11.4.3.4
Mapping Exceptions for
PIC24FJ256GA412/GB412 Family
Devices
Although the PPS registers theoretically allow for up to
44 remappable I/O pins, not all of these are implemented in all devices. For PIC24FJ256GA412/GB412
family devices, the maximum number of remappable
pins available is 44, which includes 12 input only pins.
The differences in available remappable pins are
summarized in Table 11-4.
When developing applications that use remappable
pins, users should also keep these things in mind:
• For the RPINRx registers, bit combinations corresponding to an unimplemented pin for a particular
device are treated as invalid; the corresponding
module will not have an input mapped to it.
• For RPORx registers, the bit fields corresponding
to an unimplemented pin will also be
unimplemented; writing to these fields will have
no effect.
11.4.4
CONTROLLING CONFIGURATION
CHANGES
Because peripheral remapping can be changed during
run time, some restrictions on peripheral remapping
are needed to prevent accidental configuration
changes. PIC24F devices include three features to
prevent alterations to the peripheral map:
• Control register lock sequence
• Continuous state monitoring
• Configuration bit remapping lock
TABLE 11-4:
Control Register Lock
Under normal operation, writes to the RPINRx and
RPORx registers are not allowed. Attempted writes will
appear to execute normally, but the contents of the
registers will remain unchanged. To change these registers, they must be unlocked in hardware. The register
lock is controlled by the IOLOCK bit (OSCCON<6>).
Setting IOLOCK prevents writes to the control
registers; clearing IOLOCK allows writes.
To set or clear IOLOCK, a specific command sequence
must be executed:
1.
2.
3.
Write 46h to OSCCON<7:0>.
Write 57h to OSCCON<7:0>.
Clear (or set) IOLOCK as a single operation.
Unlike the similar sequence with the oscillator’s LOCK
bit, IOLOCK remains in one state until changed. This
allows all of the Peripheral Pin Selects to be configured
with a single unlock sequence, followed by an update
to all control registers, then locked with a second lock
sequence.
11.4.4.2
Continuous State Monitoring
In addition to being protected from direct writes, the
contents of the RPINRx and RPORx registers are
constantly monitored in hardware by shadow registers.
If an unexpected change in any of the registers occurs
(such as cell disturbances caused by ESD or other
external events), a Configuration Mismatch Reset will
be triggered.
11.4.4.3
Configuration Bit Pin Select Lock
As an additional level of safety, the device can be
configured to prevent more than one write session to
the RPINRx and RPORx registers. The IOL1WAY
(FOSC<5>) Configuration bit blocks the IOLOCK bit
from being cleared after it has been set once. If
IOLOCK remains set, the register unlock procedure will
not execute and the Peripheral Pin Select Control
registers cannot be written to. The only way to clear the
bit and re-enable peripheral remapping is to perform a
device Reset.
In the default (unprogrammed) state, IOL1WAY is set,
restricting users to one write session. Programming
IOL1WAY allows users unlimited access (with the
proper use of the unlock sequence) to the Peripheral
Pin Select registers.
REMAPPABLE PIN EXCEPTIONS FOR PIC24FJ256GA412/GB412 FAMILY DEVICES
Device
RP Pins (I/O)
Total
RPI Pins
Unimplemented
Total
Unimplemented
PIC24FJXXXGA406
29
RP5, RP15, RP31
1
RPI32-36, RPI38-43
PIC24FJXXXGB406
28
RP4, RP12, RP30, RP31
1
RPI32-36, RPI38-43
DS30010089C-page 222
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
11.4.5
CONSIDERATIONS FOR
PERIPHERAL PIN SELECTION
The ability to control Peripheral Pin Selection introduces several considerations into application design
that could be overlooked. This is particularly true for
several common peripherals that are available only as
remappable peripherals.
The main consideration is that the Peripheral Pin
Selects are not available on default pins in the device’s
default (Reset) state. Since all RPINRx registers reset
to ‘111111’ and all RPORx registers reset to ‘000000’,
all Peripheral Pin Select inputs are tied to VSS, and all
Peripheral Pin Select outputs are disconnected.
This situation requires the user to initialize the device
with the proper peripheral configuration before any
other application code is executed. Since the IOLOCK
bit resets in the unlocked state, it is not necessary to
execute the unlock sequence after the device has
come out of Reset. For application safety, however, it is
best to set IOLOCK and lock the configuration after
writing to the control registers.
Because the unlock sequence is timing-critical, it must
be executed as an assembly language routine in the
same manner as changes to the oscillator configuration. If the bulk of the application is written in ‘C’, or
another high-level language, the unlock sequence
should be performed by writing in-line assembly.
Choosing the configuration requires the review of all
Peripheral Pin Selects and their pin assignments,
especially those that will not be used in the application.
In all cases, unused pin-selectable peripherals should
be disabled completely. Unused peripherals should
have their inputs assigned to an unused RPn/RPIn pin
function. I/O pins with unused RPn functions should be
configured with the null peripheral output.
The assignment of a peripheral to a particular pin does
not automatically perform any other configuration of the
pin’s I/O circuitry. In theory, this means adding a
pin-selectable output to a pin may mean inadvertently
driving an existing peripheral input when the output is
driven. Users must be familiar with the behavior of
other fixed peripherals that share a remappable pin and
know when to enable or disable them. To be safe, fixed
digital peripherals that share the same pin should be
disabled when not in use.
Along these lines, configuring a remappable pin for a
specific peripheral does not automatically turn that feature
on. The peripheral must be specifically configured for
operation and enabled as if it were tied to a fixed pin.
Where this happens in the application code (immediately
following a device Reset and peripheral configuration or
inside the main application routine) depends on the
peripheral and its use in the application.
A final consideration is that Peripheral Pin Select functions neither override analog inputs nor reconfigure
pins with analog functions for digital I/O. If a pin is
configured as an analog input on device Reset, it must
be explicitly reconfigured as a digital I/O when used
with a Peripheral Pin Select.
Example 11-4 shows a configuration for bidirectional
communication with flow control using UART1. The
following input and output functions are used:
• Input Functions: U1RX, U1CTS
• Output Functions: U1TX, U1RTS
EXAMPLE 11-4:
CONFIGURING UART1
INPUT AND OUTPUT
FUNCTIONS
// Unlock Registers
asm volatile
("MOV
"MOV
"MOV
"MOV.b
"MOV.b
"BCLR
#OSCCON, w1
#0x46, w2
#0x57, w3
w2, [w1]
w3, [w1]
OSCCON, #6");
\n"
\n"
\n"
\n"
\n"
// or use the XC16 built-in macro:
// __builtin_write_OSCCONL(OSCCON & 0xbf);
// Configure Input Functions (Table 11-2)
// Assign U1RX To Pin RP0
RPINR18bits.U1RXR = 0;
// Assign U1CTS To Pin RP1
RPINR18bits.U1CTSR = 1;
// Configure Output Functions (Table 11-3)
// Assign U1TX To Pin RP2
RPOR1bits.RP2R = 3;
// Assign U1RTS To Pin RP3
RPOR1bits.RP3R = 4;
// Lock Registers
asm volatile
("MOV
"MOV
"MOV
"MOV.b
"MOV.b
"BSET
#OSCCON, w1
#0x46, w2
#0x57, w3
w2, [w1]
w3, [w1]
OSCCON, #6");
\n"
\n"
\n"
\n"
\n"
// or use the XC16 built-in macro:
// __builtin_write_OSCCONL(OSCCON | 0x40);
 2015 Microchip Technology Inc.
DS30010089C-page 223
PIC24FJ256GA412/GB412 FAMILY
11.4.6
PERIPHERAL PIN SELECT
REGISTERS
Note:
The PIC24FJ256GA412/GB412 family of devices
implements a total of 36 registers for remappable
peripheral configuration:
Input and output register values can only
be changed if IOLOCK (OSCCON<6>) = 0.
See Section 11.4.4.1 “Control Register
Lock” for a specific command sequence.
• Input Remappable Peripheral Registers (20)
• Output Remappable Peripheral Registers (16)
REGISTER 11-11: RPINR0: PERIPHERAL PIN SELECT INPUT REGISTER 0
U-0
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
—
INT1R5
INT1R4
INT1R3
INT1R2
INT1R1
INT1R0
bit 15
bit 8
U-0
U-0
—
—
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
OCTRIG1R5 OCTRIG1R4 OCTRIG1R3 OCTRIG1R2 OCTRIG1R1 OCTRIG1R0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
Unimplemented: Read as ‘0’
bit 13-8
INT1R<5:0>: Assign External Interrupt 1 (INT1) to Corresponding RPn or RPIn Pin bits
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
OCTRIG1R<5:0>: Assign Output Compare Trigger 1 (OCTRIG1) to Corresponding RPn or RPIn Pin bits
REGISTER 11-12: RPINR1: PERIPHERAL PIN SELECT INPUT REGISTER 1
U-0
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
—
INT3R5
INT3R4
INT3R3
INT3R2
INT3R1
INT3R0
bit 15
bit 8
U-0
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
—
INT2R5
INT2R4
INT2R3
INT2R2
INT2R1
INT2R0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
Unimplemented: Read as ‘0’
bit 13-8
INT3R<5:0>: Assign External Interrupt 3 (INT3) to Corresponding RPn or RPIn Pin bits
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
INT2R<5:0>: Assign External Interrupt 2 (INT2) to Corresponding RPn or RPIn Pin bits
DS30010089C-page 224
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 11-13: RPINR2: PERIPHERAL PIN SELECT INPUT REGISTER 2
U-0
U-0
—
—
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
OCTRIG2R5 OCTRIG2R4 OCTRIG2R3 OCTRIG2R2 OCTRIG2R1 OCTRIG2R0
bit 15
bit 8
U-0
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
—
INT4R5
INT4R4
INT4R3
INT4R2
INT4R1
INT4R0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
Unimplemented: Read as ‘0’
bit 13-8
OCTRIG2R<5:0>: Assign Output Compare Trigger 2 (OCTRIG2) to Corresponding RPn or RPIn Pin bits
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
INT4R<5:0>: Assign External Interrupt 4 (INT4) to Corresponding RPn or RPIn Pin bits
REGISTER 11-14: RPINR3: PERIPHERAL PIN SELECT INPUT REGISTER 3
U-0
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
—
T3CKR5
T3CKR4
T3CKR3
T3CKR2
T3CKR1
T3CKR0
bit 15
bit 8
U-0
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
—
T2CKR5
T2CKR4
T2CKR3
T2CKR2
T2CKR1
T2CKR0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
Unimplemented: Read as ‘0’
bit 13-8
T3CKR<5:0>: Assign Timer3 Clock Input (T3CK) to Corresponding RPn or RPIn Pin bits
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
T2CKR<5:0>: Assign Timer2 Clock Input (T2CK) to Corresponding RPn or RPIn Pin bits
 2015 Microchip Technology Inc.
DS30010089C-page 225
PIC24FJ256GA412/GB412 FAMILY
REGISTER 11-15: RPINR4: PERIPHERAL PIN SELECT INPUT REGISTER 4
U-0
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
—
T5CKR5
T5CKR4
T5CKR3
T5CKR2
T5CKR1
T5CKR0
bit 15
bit 8
U-0
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
—
T4CKR5
T4CKR4
T4CKR3
T4CKR2
T4CKR1
T4CKR0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
Unimplemented: Read as ‘0’
bit 13-8
T5CKR<5:0>: Assign Timer5 Clock Input (T5CK) to Corresponding RPn or RPIn Pin bits
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
T4CKR<5:0>: Assign Timer4 Clock Input (T4CK) to Corresponding RPn or RPIn Pin bits
REGISTER 11-16: RPINR7: PERIPHERAL PIN SELECT INPUT REGISTER 7
U-0
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
—
IC2R5
IC2R4
IC2R3
IC2R2
IC2R1
IC2R0
bit 15
bit 8
U-0
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
—
IC1R5
IC1R4
IC1R3
IC1R2
IC1R1
IC1R0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
Unimplemented: Read as ‘0’
bit 13-8
IC2R<5:0>: Assign Input Capture 2 (IC2) to Corresponding RPn or RPIn Pin bits
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
IC1R<5:0>: Assign Input Capture 1 (IC1) to Corresponding RPn or RPIn Pin bits
DS30010089C-page 226
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 11-17: RPINR8: PERIPHERAL PIN SELECT INPUT REGISTER 8
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
U-0
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
—
IC3R5
IC3R4
IC3R3
IC3R2
IC3R1
IC3R0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-6
Unimplemented: Read as ‘0’
bit 5-0
IC3R<5:0>: Assign Input Capture 3 (IC3) to Corresponding RPn or RPIn Pin bits
REGISTER 11-18: RPINR11: PERIPHERAL PIN SELECT INPUT REGISTER 11
U-0
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
—
OCFBR5
OCFBR4
OCFBR3
OCFBR2
OCFBR1
OCFBR0
bit 15
bit 8
U-0
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
—
OCFAR5
OCFAR4
OCFAR3
OCFAR2
OCFAR1
OCFAR0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
Unimplemented: Read as ‘0’
bit 13-8
OCFBR<5:0>: Assign Output Compare Fault B (OCFB) to Corresponding RPn or RPIn Pin bits
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
OCFAR<5:0>: Assign Output Compare Fault A (OCFA) to Corresponding RPn or RPIn Pin bits
 2015 Microchip Technology Inc.
DS30010089C-page 227
PIC24FJ256GA412/GB412 FAMILY
REGISTER 11-19: RPINR12: PERIPHERAL PIN SELECT INPUT REGISTER 12
U-0
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
—
TCKIBR5
TCKIBR4
TCKIBR3
TCKIBR2
TCKIBR1
TCKIBR0
bit 15
bit 8
U-0
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
—
TCKIAR5
TCKIAR4
TCKIAR3
TCKIAR2
TCKIAR1
TCKIAR0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
Unimplemented: Read as ‘0’
bit 13-8
TCKIBR<5:0>: Assign CCP External Clock Input B (TCKIB) to Corresponding RPn or RPIn Pin bits
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
TCKIAR<5:0>: Assign CCP External Clock Input A (TCKIA) to Corresponding RPn or RPIn Pin bits
REGISTER 11-20: RPINR17: PERIPHERAL PIN SELECT INPUT REGISTER 17
U-0
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
—
U3RXR5
U3RXR4
U3RXR3
U3RXR2
U3RXR1
U3RXR0
bit 15
bit 8
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
Unimplemented: Read as ‘0’
bit 13-8
U3RXR<5:0>: Assign UART3 Receive (U3RX) to Corresponding RPn or RPIn Pin bits
bit 7-0
Unimplemented: Read as ‘0’
DS30010089C-page 228
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 11-21: RPINR18: PERIPHERAL PIN SELECT INPUT REGISTER 18
U-0
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
—
U1CTSR5
U1CTSR4
U1CTSR3
U1CTSR2
U1CTSR1
U1CTSR0
bit 15
bit 8
U-0
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
—
U1RXR5
U1RXR4
U1RXR3
U1RXR2
U1RXR1
U1RXR0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-14
x = Bit is unknown
Unimplemented: Read as ‘0’
bit 13-8
U1CTSR<5:0>: Assign UART1 Clear-to-Send (U1CTS) to Corresponding RPn or RPIn Pin bits
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
U1RXR<5:0>: Assign UART1 Receive (U1RX) to Corresponding RPn or RPIn Pin bits
REGISTER 11-22: RPINR19: PERIPHERAL PIN SELECT INPUT REGISTER 19
U-0
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
—
U2CTSR5
U2CTSR4
U2CTSR3
U2CTSR2
U2CTSR1
U2CTSR0
bit 15
bit 8
U-0
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
—
U2RXR5
U2RXR4
U2RXR3
U2RXR2
U2RXR1
U2RXR0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
Unimplemented: Read as ‘0’
bit 13-8
U2CTSR<5:0>: Assign UART2 Clear-to-Send (U2CTS) to Corresponding RPn or RPIn Pin bits
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
U2RXR<5:0>: Assign UART2 Receive (U2RX) to Corresponding RPn or RPIn Pin bits
 2015 Microchip Technology Inc.
DS30010089C-page 229
PIC24FJ256GA412/GB412 FAMILY
REGISTER 11-23: RPINR20: PERIPHERAL PIN SELECT INPUT REGISTER 20
U-0
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
—
SCK1R5
SCK1R4
SCK1R3
SCK1R2
SCK1R1
SCK1R0
bit 15
bit 8
U-0
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
—
SDI1R5
SDI1R4
SDI1R3
SDI1R2
SDI1R1
SDI1R0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
Unimplemented: Read as ‘0’
bit 13-8
SCK1R<5:0>: Assign SPI1 Clock Input (SCK1IN) to Corresponding RPn or RPIn Pin bits
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
SDI1R<5:0>: Assign SPI1 Data Input (SDI1) to Corresponding RPn or RPIn Pin bits
REGISTER 11-24: RPINR21: PERIPHERAL PIN SELECT INPUT REGISTER 21
U-0
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
—
U3CTSR5
U3CTSR4
U3CTSR3
U3CTSR2
U3CTSR1
U3CTSR0
bit 15
bit 8
U-0
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
—
SS1R5
SS1R4
SS1R3
SS1R2
SS1R1
SS1R0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-14
x = Bit is unknown
Unimplemented: Read as ‘0’
bit 13-8
U3CTSR<5:0>: Assign UART3 Clear-to-Send (U3CTS) to Corresponding RPn or RPIn Pin bits
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
SS1R<5:0>: Assign SPI1 Slave Select Input (SS1IN) to Corresponding RPn or RPIn Pin bits
DS30010089C-page 230
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 11-25: RPINR22: PERIPHERAL PIN SELECT INPUT REGISTER 22
U-0
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
—
SCK2R5
SCK2R4
SCK2R3
SCK2R2
SCK2R1
SCK2R0
bit 15
bit 8
U-0
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
—
SDI2R5
SDI2R4
SDI2R3
SDI2R2
SDI2R1
SDI2R0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
Unimplemented: Read as ‘0’
bit 13-8
SCK2R<5:0>: Assign SPI2 Clock Input (SCK2IN) to Corresponding RPn or RPIn Pin bits
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
SDI2R<5:0>: Assign SPI2 Data Input (SDI2) to Corresponding RPn or RPIn Pin bits
REGISTER 11-26: RPINR23: PERIPHERAL PIN SELECT INPUT REGISTER 23
U-0
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
—
TXCKR5
TXCKR4
TXCKR3
TXCKR2
TXCKR1
TXCKR0
bit 15
bit 8
U-0
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
—
SS2R5
SS2R4
SS2R3
SS2R2
SS2R1
SS2R0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
Unimplemented: Read as ‘0’
bit 13-8
TXCKR<5:0>: Assign General Timer External Input (TMRCK) to Corresponding RPn or RPIn Pin bits
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
SS2R<5:0>: Assign SPI2 Slave Select Input (SS2IN) to Corresponding RPn or RPIn Pin bits
 2015 Microchip Technology Inc.
DS30010089C-page 231
PIC24FJ256GA412/GB412 FAMILY
REGISTER 11-27: RPINR25: PERIPHERAL PIN SELECT INPUT REGISTER 25
U-0
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
—
CLCINBR5
CLCINBR4
CLCINBR3
CLCINBR2
CLCINBR1
CLCINBR0
bit 15
bit 8
U-0
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
—
CLCINAR5
CLCINAR4
CLCINAR3
CLCINAR2
CLCINAR1
CLCINAR0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
Unimplemented: Read as ‘0’
bit 13-8
CLCINBR<5:0>: Assign CLC External Input B (CLCINB) to Corresponding RPn or RPIn Pin bits
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
CLCINAR<5:0>: Assign CLC External Input A (CLCINA) to Corresponding RPn or RPIn Pin bits
REGISTER 11-28: RPINR27: PERIPHERAL PIN SELECT INPUT REGISTER 27
U-0
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
—
U4CTSR5
U4CTSR4
U4CTSR3
U4CTSR2
U4CTSR1
U4CTSR0
bit 15
bit 8
U-0
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
—
U4RXR5
U4RXR4
U4RXR3
U4RXR2
U4RXR1
U4RXR0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
Unimplemented: Read as ‘0’
bit 13-8
U4CTSR<5:0>: Assign UART4 Clear-to-Send Input (U4CTS) to Corresponding RPn or RPIn Pin bits
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
U4RXR<5:0>: Assign UART4 Receive Input (U4RX) to Corresponding RPn or RPIn Pin bits
DS30010089C-page 232
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 11-29: RPINR28: PERIPHERAL PIN SELECT INPUT REGISTER 28
U-0
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
—
SCK3R5
SCK3R4
SCK3R3
SCK3R2
SCK3R1
SCK3R0
bit 15
bit 8
U-0
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
—
SDI3R5
SDI3R4
SDI3R3
SDI3R2
SDI3R1
SDI3R0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
Unimplemented: Read as ‘0’
bit 13-8
SCK3R<5:0>: Assign SPI3 Clock Input (SCK3IN) to Corresponding RPn or RPIn Pin bits
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
SDI3R<5:0>: Assign SPI3 Data Input (SDI3) to Corresponding RPn or RPIn Pin bits
REGISTER 11-30: RPINR29: PERIPHERAL PIN SELECT INPUT REGISTER 29
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
U-0
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
—
SS3R5
SS3R4
SS3R3
SS3R2
SS3R1
SS3R0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-6
Unimplemented: Read as ‘0’
bit 5-0
SS3R<5:0>: Assign SPI3 Slave Select Input (SS3IN) to Corresponding RPn or RPIn Pin bits
 2015 Microchip Technology Inc.
DS30010089C-page 233
PIC24FJ256GA412/GB412 FAMILY
REGISTER 11-31: RPOR0: PERIPHERAL PIN SELECT OUTPUT REGISTER 0
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
RP1R5
RP1R4
RP1R3
RP1R2
RP1R1
RP1R0
bit 15
bit 8
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
RP0R5
RP0R4
RP0R3
RP0R2
RP0R1
RP0R0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
Unimplemented: Read as ‘0’
bit 13-8
RP1R<5:0>: RP1 Output Pin Mapping bits
Peripheral Output Number n is assigned to pin, RP1 (see Table 11-3 for peripheral function numbers).
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
RP0R<5:0>: RP0 Output Pin Mapping bits
Peripheral Output Number n is assigned to pin, RP0 (see Table 11-3 for peripheral function numbers).
REGISTER 11-32: RPOR1: PERIPHERAL PIN SELECT OUTPUT REGISTER 1
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
RP3R5
RP3R4
RP3R3
RP3R2
RP3R1
RP3R0
bit 15
bit 8
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
RP2R5
RP2R4
RP2R3
RP2R2
RP2R1
RP2R0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
Unimplemented: Read as ‘0’
bit 13-8
RP3R<5:0>: RP3 Output Pin Mapping bits
Peripheral Output Number n is assigned to pin, RP3 (see Table 11-3 for peripheral function numbers).
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
RP2R<5:0>: RP2 Output Pin Mapping bits
Peripheral Output Number n is assigned to pin, RP2 (see Table 11-3 for peripheral function numbers).
DS30010089C-page 234
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 11-33: RPOR2: PERIPHERAL PIN SELECT OUTPUT REGISTER 2
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
RP5R5
RP5R4
RP5R3
RP5R2
RP5R1
RP5R0
bit 15
bit 8
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
RP4R5(1)
RP4R4(1)
RP4R3(1)
RP4R2(1)
RP4R1(1)
RP4R0(1)
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
Unimplemented: Read as ‘0’
bit 13-8
RP5R<5:0>: RP5 Output Pin Mapping bits
Peripheral Output Number n is assigned to pin, RP5 (see Table 11-3 for peripheral function numbers).
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
RP4R<5:0>: RP4 Output Pin Mapping bits(1)
Peripheral Output Number n is assigned to pin, RP4 (see Table 11-3 for peripheral function numbers).
Note 1:
RP4 and its associated bits are not available in 64-pin devices.
REGISTER 11-34: RPOR3: PERIPHERAL PIN SELECT OUTPUT REGISTER 3
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
RP7R5
RP7R4
RP7R3
RP7R2
RP7R1
RP7R0
bit 15
bit 8
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
RP6R5
RP6R4
RP6R3
RP6R2
RP6R1
RP6R0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
Unimplemented: Read as ‘0’
bit 13-8
RP7R<5:0>: RP7 Output Pin Mapping bits
Peripheral Output Number n is assigned to pin, RP7 (see Table 11-3 for peripheral function numbers).
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
RP6R<5:0>: RP6 Output Pin Mapping bits
Peripheral Output Number n is assigned to pin, RP6 (see Table 11-3 for peripheral function numbers).
 2015 Microchip Technology Inc.
DS30010089C-page 235
PIC24FJ256GA412/GB412 FAMILY
REGISTER 11-35: RPOR4: PERIPHERAL PIN SELECT OUTPUT REGISTER 4
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
RP9R5
RP9R4
RP9R3
RP9R2
RP9R1
RP9R0
bit 15
bit 8
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
RP8R5
RP8R4
RP8R3
RP8R2
RP8R1
RP8R0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
Unimplemented: Read as ‘0’
bit 13-8
RP9R<5:0>: RP9 Output Pin Mapping bits
Peripheral Output Number n is assigned to pin, RP9 (see Table 11-3 for peripheral function numbers).
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
RP8R<5:0>: RP8 Output Pin Mapping bits
Peripheral Output Number n is assigned to pin, RP8 (see Table 11-3 for peripheral function numbers).
REGISTER 11-36: RPOR5: PERIPHERAL PIN SELECT OUTPUT REGISTER 5
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
RP11R5
RP11R4
RP11R3
RP11R2
RP11R1
RP11R0
bit 15
bit 8
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
RP10R5
RP10R4
RP10R3
RP10R2
RP10R1
RP10R0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
Unimplemented: Read as ‘0’
bit 13-8
RP11R<5:0>: RP11 Output Pin Mapping bits
Peripheral Output Number n is assigned to pin, RP11 (see Table 11-3 for peripheral function numbers).
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
RP10R<5:0>: RP10 Output Pin Mapping bits
Peripheral Output Number n is assigned to pin, RP10 (see Table 11-3 for peripheral function numbers).
DS30010089C-page 236
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 11-37: RPOR6: PERIPHERAL PIN SELECT OUTPUT REGISTER 6
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
RP13R5
RP13R4
RP13R3
RP13R2
RP13R1
RP13R0
bit 15
bit 8
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
RP12R5
RP12R4
RP12R3
RP12R2
RP12R1
RP12R0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
Unimplemented: Read as ‘0’
bit 13-8
RP13R<5:0>: RP13 Output Pin Mapping bits
Peripheral Output Number n is assigned to pin, RP13 (see Table 11-3 for peripheral function numbers).
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
RP12R<5:0>: RP12 Output Pin Mapping bits
Peripheral Output Number n is assigned to pin, RP12 (see Table 11-3 for peripheral function numbers).
REGISTER 11-38: RPOR7: PERIPHERAL PIN SELECT OUTPUT REGISTER 7
U-0
—
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
RP15R5(1)
RP15R4(1)
RP15R3(1)
RP15R2(1)
RP15R1(1)
RP15R0(1)
bit 15
bit 8
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
RP14R5
RP14R4
RP14R3
RP14R2
RP14R1
RP14R0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
Unimplemented: Read as ‘0’
bit 13-8
RP15R<5:0>: RP15 Output Pin Mapping bits(1)
Peripheral Output Number n is assigned to pin, RP15 (see Table 11-3 for peripheral function numbers).
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
RP14R<5:0>: RP14 Output Pin Mapping bits
Peripheral Output Number n is assigned to pin, RP14 (see Table 11-3 for peripheral function numbers).
Note 1:
RP15 and its associated bits are not available on 64-pin devices.
 2015 Microchip Technology Inc.
DS30010089C-page 237
PIC24FJ256GA412/GB412 FAMILY
REGISTER 11-39: RPOR8: PERIPHERAL PIN SELECT OUTPUT REGISTER 8
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
RP17R5
RP17R4
RP17R3
RP17R2
RP17R1
RP17R0
bit 15
bit 8
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
RP16R5
RP16R4
RP16R3
RP16R2
RP16R1
RP16R0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
Unimplemented: Read as ‘0’
bit 13-8
RP17R<5:0>: RP17 Output Pin Mapping bits
Peripheral Output Number n is assigned to pin, RP17 (see Table 11-3 for peripheral function numbers).
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
RP16R<5:0>: RP16 Output Pin Mapping bits
Peripheral Output Number n is assigned to pin, RP16 (see Table 11-3 for peripheral function numbers).
REGISTER 11-40: RPOR9: PERIPHERAL PIN SELECT OUTPUT REGISTER 9
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
RP19R5
RP19R4
RP19R3
RP19R2
RP19R1
RP19R0
bit 15
bit 8
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
RP18R5
RP18R4
RP18R3
RP18R2
RP18R1
RP18R0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
Unimplemented: Read as ‘0’
bit 13-8
RP19R<5:0>: RP19 Output Pin Mapping bits
Peripheral Output Number n is assigned to pin, RP19 (see Table 11-3 for peripheral function numbers).
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
RP18R<5:0>: RP18 Output Pin Mapping bits
Peripheral Output Number n is assigned to pin, RP18 (see Table 11-3 for peripheral function numbers).
DS30010089C-page 238
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 11-41: RPOR10: PERIPHERAL PIN SELECT OUTPUT REGISTER 10
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
RP21R5
RP21R4
RP21R3
RP21R2
RP21R1
RP21R0
bit 15
bit 8
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
RP20R5
RP20R4
RP20R3
RP20R2
RP20R1
RP20R0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
Unimplemented: Read as ‘0’
bit 13-8
RP21R<5:0>: RP21 Output Pin Mapping bits
Peripheral Output Number n is assigned to pin, RP21 (see Table 11-3 for peripheral function numbers).
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
RP20R<5:0>: RP20 Output Pin Mapping bits
Peripheral Output Number n is assigned to pin, RP20 (see Table 11-3 for peripheral function numbers).
REGISTER 11-42: RPOR11: PERIPHERAL PIN SELECT OUTPUT REGISTER 11
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
RP23R5
RP23R4
RP23R3
RP23R2
RP23R1
RP23R0
bit 15
bit 8
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
RP22R5
RP22R4
RP22R3
RP22R2
RP22R1
RP22R0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
Unimplemented: Read as ‘0’
bit 13-8
RP23R<5:0>: RP23 Output Pin Mapping bits
Peripheral Output Number n is assigned to pin, RP23 (see Table 11-3 for peripheral function numbers).
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
RP22R<5:0>: RP22 Output Pin Mapping bits
Peripheral Output Number n is assigned to pin, RP22 (see Table 11-3 for peripheral function numbers).
 2015 Microchip Technology Inc.
DS30010089C-page 239
PIC24FJ256GA412/GB412 FAMILY
REGISTER 11-43: RPOR12: PERIPHERAL PIN SELECT OUTPUT REGISTER 12
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
RP25R5
RP25R4
RP25R3
RP25R2
RP25R1
RP25R0
bit 15
bit 8
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
RP24R5
RP24R4
RP24R3
RP24R2
RP24R1
RP24R0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
Unimplemented: Read as ‘0’
bit 13-8
RP25R<5:0>: RP25 Output Pin Mapping bits
Peripheral Output Number n is assigned to pin, RP25 (see Table 11-3 for peripheral function numbers).
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
RP24R<5:0>: RP24 Output Pin Mapping bits
Peripheral Output Number n is assigned to pin, RP24 (see Table 11-3 for peripheral function numbers).
REGISTER 11-44: RPOR13: PERIPHERAL PIN SELECT OUTPUT REGISTER 13
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
RP27R5
RP27R4
RP27R3
RP27R2
RP27R1
RP27R0
bit 15
bit 8
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
RP26R5
RP26R4
RP26R3
RP26R2
RP26R1
RP26R0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
Unimplemented: Read as ‘0’
bit 13-8
RP27R<5:0>: RP27 Output Pin Mapping bits
Peripheral Output Number n is assigned to pin, RP27 (see Table 11-3 for peripheral function numbers).
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
RP26R<5:0>: RP26 Output Pin Mapping bits
Peripheral Output Number n is assigned to pin, RP26 (see Table 11-3 for peripheral function numbers).
DS30010089C-page 240
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 11-45: RPOR14: PERIPHERAL PIN SELECT OUTPUT REGISTER 14
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
RP29R5
RP29R4
RP29R3
RP29R2
RP29R1
RP29R0
bit 15
bit 8
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
RP28R5
RP28R4
RP28R3
RP28R2
RP28R1
RP28R0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
Unimplemented: Read as ‘0’
bit 13-8
RP29R<5:0>: RP29 Output Pin Mapping bits
Peripheral Output Number n is assigned to pin, RP29 (see Table 11-3 for peripheral function numbers).
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
RP28R<5:0>: RP28 Output Pin Mapping bits
Peripheral Output Number n is assigned to pin, RP28 (see Table 11-3 for peripheral function numbers).
REGISTER 11-46: RPOR15: PERIPHERAL PIN SELECT OUTPUT REGISTER 15
U-0
—
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
RP31R5(1)
RP31R4(1)
RP31R3(1)
RP31R2(1)
RP31R1(1)
RP31R0(1)
bit 15
bit 8
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
RP30R5
RP30R4
RP30R3
RP30R2
RP30R1
RP30R0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
Unimplemented: Read as ‘0’
bit 13-8
RP31R<5:0>: RP31 Output Pin Mapping bits(1)
Peripheral Output Number n is assigned to pin, RP31 (see Table 11-3 for peripheral function numbers).
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
RP30R<5:0>: RP30 Output Pin Mapping bits
Peripheral Output Number n is assigned to pin, RP30 (see Table 11-3 for peripheral function numbers).
Note 1:
RP31 and its associated bits are not available on 64-pin devices.
 2015 Microchip Technology Inc.
DS30010089C-page 241
PIC24FJ256GA412/GB412 FAMILY
NOTES:
DS30010089C-page 242
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
12.0
TIMER1
Note:
Figure 12-1 shows a block diagram of the 16-bit timer
module.
This data sheet summarizes the features of
this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to
the “dsPIC33/PIC24 Family Reference
Manual”, “Timers” (DS39704). The information in this data sheet supersedes the
information in the FRM.
To configure Timer1 for operation:
1.
2.
3.
4.
The Timer1 module is a 16-bit timer, which serves as a
free-running, interval timer/counter. It can operate in
three modes:
• 16-Bit Timer
• 16-Bit Synchronous Counter
• 16-Bit Asynchronous Counter
5.
6.
Set the TON bit (= 1).
Select the timer prescaler ratio using the
TCKPS<1:0> bits.
Set the Clock and Gating modes using the TCS,
TECS<1:0> and TGATE bits.
Set or clear the TSYNC bit to configure
synchronous or asynchronous operation.
Load the timer period value into the PR1
register.
If interrupts are required, set the Timer1 Interrupt Enable bit, T1IE. Use the Timer1 Interrupt
Priority bits, T1IP<2:0>, to set the interrupt
priority.
Timer1 also supports these features:
•
•
•
•
Timer Gate Operation
Selectable Prescaler Settings
Timer Operation during CPU Idle and Sleep Modes
Interrupt on 16-Bit Period Register Match or
Falling Edge of External Gate Signal
FIGURE 12-1:
16-BIT TIMER1 MODULE BLOCK DIAGRAM
TGATE
LPRC
Clock
Input Select
SOSCO
D
Q
1
CK
Q
0
TMR1
SOSCI
Comparator
SOSCSEL<1:0>
SOSCEN
Set T1IF
Reset
Equal
PR1
Clock Input Select Detail
SOSC
Input
T1CK Input
TON
Gate
Output
TCKPS<1:0>
2
TMRCK Input
Gate
Sync
LPRC Input
2
0
Sync
TCY
TECS<1:0>
TGATE
TCS
 2015 Microchip Technology Inc.
Prescaler
1, 8, 64, 256
1
Clock
Output
to TMR1
TSYNC
DS30010089C-page 243
PIC24FJ256GA412/GB412 FAMILY
T1CON: TIMER1 CONTROL REGISTER(1)
REGISTER 12-1:
R/W-0
U-0
R/W-0
U-0
U-0
U-0
R/W-0
R/W-0
TON
—
TSIDL
—
—
—
TECS1
TECS0
bit 15
bit 8
U-0
R/W-0
R/W-0
R/W-0
U-0
R/W-0
R/W-0
U-0
—
TGATE
TCKPS1
TCKPS0
—
TSYNC
TCS
—
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
TON: Timer1 On bit
1 = Starts 16-bit Timer1
0 = Stops 16-bit Timer1
bit 14
Unimplemented: Read as ‘0’
bit 13
TSIDL: Timer1 Stop in Idle Mode bit
1 = Discontinues module operation when device enters Idle mode
0 = Continues module operation in Idle mode
bit 12-10
Unimplemented: Read as ‘0’
bit 9-8
TECS<1:0>: Timer1 Extended Clock Source Select bits (selected when TCS = 1)
When TCS = 1:
11 = Generic Timer (TMRCK) external input(2)
10 = LPRC Oscillator
01 = T1CK external clock input
00 = SOSC
When TCS = 0:
These bits are ignored; the timer is clocked from the internal system clock (FOSC/2).
bit 7
Unimplemented: Read as ‘0’
bit 6
TGATE: Timer1 Gated Time Accumulation Enable bit
When TCS = 1:
This bit is ignored.
When TCS = 0:
1 = Gated time accumulation is enabled
0 = Gated time accumulation is disabled
bit 5-4
TCKPS<1:0>: Timer1 Input Clock Prescale Select bits
11 = 1:256
10 = 1:64
01 = 1:8
00 = 1:1
bit 3
Unimplemented: Read as ‘0’
Note 1:
2:
Changing the value of T1CON while the timer is running (TON = 1) causes the timer prescale counter to
reset and is not recommended.
The TMRCK input must also be assigned to an available RPn or RPIn pin. See Section 11.4 “Peripheral
Pin Select (PPS)” for more information.
DS30010089C-page 244
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 12-1:
T1CON: TIMER1 CONTROL REGISTER(1) (CONTINUED)
bit 2
TSYNC: Timer1 External Clock Input Synchronization Select bit
When TCS = 1:
1 = Synchronizes external clock input
0 = Does not synchronize external clock input
When TCS = 0:
This bit is ignored.
bit 1
TCS: Timer1 Clock Source Select bit
1 = Extended clock selected by the TECS<1:0> bits
0 = Internal clock (FOSC/2)
bit 0
Unimplemented: Read as ‘0’
Note 1:
2:
Changing the value of T1CON while the timer is running (TON = 1) causes the timer prescale counter to
reset and is not recommended.
The TMRCK input must also be assigned to an available RPn or RPIn pin. See Section 11.4 “Peripheral
Pin Select (PPS)” for more information.
 2015 Microchip Technology Inc.
DS30010089C-page 245
PIC24FJ256GA412/GB412 FAMILY
NOTES:
DS30010089C-page 246
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
13.0
Note:
TIMER2/3 AND TIMER4/5
This data sheet summarizes the features of
this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to
the “dsPIC33/PIC24 Family Reference
Manual”, “Timers” (DS39704). The information in this data sheet supersedes the
information in the FRM.
The Timer2/3 and Timer4/5 modules are 32-bit timers,
which can also be configured as four independent, 16-bit
timers with selectable operating modes.
To configure Timer2/3 or Timer4/5 for 32-bit operation:
1.
2.
3.
4.
As 32-bit timers, Timer2/3 and Timer4/5 can each
operate in three modes:
• Two Independent 16-Bit Timers with all 16-Bit
Operating Modes (except Asynchronous Counter
mode)
• Single 32-Bit Timer
• Single 32-Bit Synchronous Counter
They also support these features:
•
•
•
•
•
Timer Gate Operation
Selectable Prescaler Settings
Timer Operation during Idle and Sleep Modes
Interrupt on a 32-Bit Period Register Match
A/D Event Trigger (only on Timer2/3 in 32-bit
mode and Timer3 in 16-bit mode)
Individually, all four of the 16-bit timers can function as
synchronous timers or counters. They also offer the
features listed above, except for the A/D Event Trigger.
This trigger is implemented only on Timer2/3 in 32-bit
mode and Timer3 in 16-bit mode. The operating modes
and enabled features are determined by setting the
appropriate bit(s) in the T2CON, T3CON, T4CON and
T5CON registers. T2CON and T4CON are shown in
generic form in Register 13-1; T3CON and T5CON are
shown in Register 13-2.
For 32-bit timer/counter operation, Timer2 and Timer4
are the least significant word; Timer3 and Timer5 are
the most significant word of the 32-bit timers.
Note:
5.
6.
Set the T32 or T45 bit (T2CON<3> or
T4CON<3> = 1).
Select the prescaler ratio for Timer2 or Timer4
using the TCKPS<1:0> bits.
Set the Clock and Gating modes using the TCS
and TGATE bits. If TCS is set to an external
clock, RPINRx (TxCK) must be configured to
an available RPn/RPIn pin. For more information, see Section 11.4 “Peripheral Pin Select
(PPS)”.
Load the timer period value. PR3 (or PR5) will
contain the most significant word (msw) of the
value, while PR2 (or PR4) contains the least
significant word (lsw).
If interrupts are required, set the interrupt enable
bit, T3IE or T5IE. Use the priority bits, T3IP<2:0>
or T5IP<2:0>, to set the interrupt priority. Note
that while Timer2 or Timer4 controls the timer, the
interrupt appears as a Timer3 or Timer5 interrupt.
Set the TON bit (= 1).
The timer value, at any point, is stored in the register
pair, TMR<3:2> (or TMR<5:4>). TMR3 (TMR5) always
contains the most significant word of the count, while
TMR2 (TMR4) contains the least significant word.
To configure any of the timers for individual 16-bit
operation:
1.
2.
3.
4.
5.
6.
Clear the T32 bit corresponding to that timer
(T2CON<3> for Timer2 and Timer3 or
T4CON<3> for Timer4 and Timer5).
Select the timer prescaler ratio using the
TCKPS<1:0> bits.
Set the Clock and Gating modes using the TCS
and TGATE bits. See Section 11.4 “Peripheral
Pin Select (PPS)” for more information.
Load the timer period value into the PRx register.
If interrupts are required, set the interrupt enable
bit, TxIE. Use the priority bits, TxIP<2:0>, to set
the interrupt priority.
Set the TON (TxCON<15> = 1) bit.
For 32-bit operation, T3CON and T5CON
control bits are ignored. Only T2CON and
T4CON control bits are used for setup and
control. Timer2 and Timer4 clock and gate
inputs are utilized for the 32-bit timer
modules, but an interrupt is generated
with the Timer3 or Timer5 interrupt flags.
 2015 Microchip Technology Inc.
DS30010089C-page 247
PIC24FJ256GA412/GB412 FAMILY
FIGURE 13-1:
TIMER2/3 AND TIMER4/5 (32-BIT) BLOCK DIAGRAM
T2CK
(T4CK)
TCY
TCKPS<1:0>
TMRCK
2
SOSC Input
LPRC Input
Prescaler
1, 8, 64, 256
Gate
Sync
TECS<1:0>
TGATE(2)
TCS(2)
TGATE
Set T3IF (T5IF)
1
Q
0
Q
PR3
(PR5)
Equal
D
CK
PR2
(PR4)
Comparator
A/D Event Trigger(3)
MSB
LSB
TMR3
(TMR5)
Reset
TMR2
(TMR4)
Sync
16
(1)
Read TMR2 (TMR4)
Write TMR2 (TMR4)(1)
16
TMR3HLD
(TMR5HLD)
16
Data Bus<15:0>
Note 1:
2:
3:
The 32-Bit Timer Configuration bit, T32, must be set for 32-bit timer/counter operation. All control bits are
respective to the T2CON and T4CON registers.
The timer clock input must be assigned to an available RPn/RPIn pin before use. See Section 11.4 “Peripheral Pin
Select (PPS)” for more information.
The A/D Event Trigger is available only on Timer2/3 in 32-bit mode and Timer3 in 16-bit mode.
DS30010089C-page 248
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
FIGURE 13-2:
TIMER2 AND TIMER4 (16-BIT SYNCHRONOUS) BLOCK DIAGRAM
T2CK
(T4CK)
TCY
TMRCK
TON
TCKPS<1:0>
2
SOSC Input
LPRC Input
Prescaler
1, 8, 64, 256
Gate
Sync
TECS<1:0>
TGATE(1)
TCS(1)
TGATE
1
Q
D
0
Q
CK
Set T2IF (T4IF)
Reset
Equal
Sync
TMR2 (TMR4)
Comparator
PR2 (PR4)
Note 1:
The timer clock input must be assigned to an available RPn/RPIn pin before use. See Section 11.4 “Peripheral
Pin Select (PPS)” for more information.
FIGURE 13-3:
TIMER3 AND TIMER5 (16-BIT ASYNCHRONOUS) BLOCK DIAGRAM
T3CK
(T5CK)
TCY
TON
TMRCK
TCKPS<1:0>
2
SOSC Input
LPRC Input
Prescaler
1, 8, 64, 256
Gate
Sync
TGATE
TECS<1:0>
1
Set T3IF (T5IF)
0
Reset
A/D Event Trigger(2)
Equal
TGATE(1)
TCS(1)
Q
D
Q
CK
TMR3 (TMR5)
Comparator
PR3 (PR5)
Note 1:
2:
The timer clock input must be assigned to an available RPn/RPIn pin before use. See Section 11.4 “Peripheral
Pin Select (PPS)” for more information.
The A/D Event Trigger is available only on Timer3.
 2015 Microchip Technology Inc.
DS30010089C-page 249
PIC24FJ256GA412/GB412 FAMILY
TxCON: TIMER2 AND TIMER4 CONTROL REGISTER(1)
REGISTER 13-1:
R/W-0
U-0
R/W-0
U-0
U-0
U-0
R/W-0
R/W-0
TON
—
TSIDL
—
—
—
TECS1(2)
TECS0(2)
bit 15
bit 8
U-0
R/W-0
R/W-0
R/W-0
R/W-0
U-0
R/W-0
U-0
—
TGATE
TCKPS1
TCKPS0
T32(3)
—
TCS(2)
—
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
TON: Timerx On bit
When TxCON<3> = 1:
1 = Starts 32-bit Timerx/y
0 = Stops 32-bit Timerx/y
When TxCON<3> = 0:
1 = Starts 16-bit Timerx
0 = Stops 16-bit Timerx
x = Bit is unknown
bit 14
Unimplemented: Read as ‘0’
bit 13
TSIDL: Timerx Stop in Idle Mode bit
1 = Discontinues module operation when device enters Idle mode
0 = Continues module operation in Idle mode
bit 12-10
Unimplemented: Read as ‘0’
bit 9-8
TECS<1:0>: Timerx Extended Clock Source Select bits (selected when TCS = 1)(2)
When TCS = 1:
11 = Generic Timer (TMRCK) external input
10 = LPRC Oscillator
01 = TxCK external clock input
00 = SOSC
When TCS = 0:
These bits are ignored; the Timer is clocked from the internal system clock (FOSC/2).
bit 7
Unimplemented: Read as ‘0’
bit 6
TGATE: Timerx Gated Time Accumulation Enable bit
When TCS = 1:
This bit is ignored.
When TCS = 0:
1 = Gated time accumulation is enabled
0 = Gated time accumulation is disabled
bit 5-4
TCKPS<1:0>: Timerx Input Clock Prescale Select bits
11 = 1:256
10 = 1:64
01 = 1:8
00 = 1:1
Note 1:
2:
3:
Changing the value of TxCON while the timer is running (TON = 1) causes the timer prescale counter to
reset and is not recommended.
If TCS = 1 and TECS<1:0> = x1, the selected external timer input (TMRCK or TxCK) must be configured
to an available RPn/RPIn pin. For more information, see Section 11.4 “Peripheral Pin Select (PPS)”.
In T4CON, the T45 bit is implemented instead of T32 to select 32-bit mode. In 32-bit mode, the T3CON or
T5CON control bits do not affect 32-bit timer operation.
DS30010089C-page 250
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 13-1:
TxCON: TIMER2 AND TIMER4 CONTROL REGISTER(1) (CONTINUED)
bit 3
T32: 32-Bit Timer Mode Select bit(3)
1 = Timerx and Timery form a single 32-bit timer
0 = Timerx and Timery act as two 16-bit timers
In 32-bit mode, T3CON control bits do not affect 32-bit timer operation.
bit 2
Unimplemented: Read as ‘0’
bit 1
TCS: Timerx Clock Source Select bit(2)
1 = Timer source is selected by TECS<1:0>
0 = Internal clock (FOSC/2)
bit 0
Unimplemented: Read as ‘0’
Note 1:
2:
3:
Changing the value of TxCON while the timer is running (TON = 1) causes the timer prescale counter to
reset and is not recommended.
If TCS = 1 and TECS<1:0> = x1, the selected external timer input (TMRCK or TxCK) must be configured
to an available RPn/RPIn pin. For more information, see Section 11.4 “Peripheral Pin Select (PPS)”.
In T4CON, the T45 bit is implemented instead of T32 to select 32-bit mode. In 32-bit mode, the T3CON or
T5CON control bits do not affect 32-bit timer operation.
 2015 Microchip Technology Inc.
DS30010089C-page 251
PIC24FJ256GA412/GB412 FAMILY
TyCON: TIMER3 AND TIMER5 CONTROL REGISTER(1)
REGISTER 13-2:
R/W-0
U-0
R/W-0
U-0
U-0
U-0
R/W-0
R/W-0
TON(2)
—
TSIDL(2)
—
—
—
TECS1(2,3)
TECS0(2,3)
bit 15
bit 8
U-0
R/W-0
R/W-0
R/W-0
U-0
U-0
R/W-0
U-0
—
TGATE(2)
TCKPS1(2)
TCKPS0(2)
—
—
TCS(2,3)
—
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
TON: Timery On bit(2)
1 = Starts 16-bit Timery
0 = Stops 16-bit Timery
bit 14
Unimplemented: Read as ‘0’
bit 13
TSIDL: Timery Stop in Idle Mode bit(2)
1 = Discontinues module operation when device enters Idle mode
0 = Continues module operation in Idle mode
bit 12-10
Unimplemented: Read as ‘0’
bit 9-8
TECS<1:0>: Timery Extended Clock Source Select bits (selected when TCS = 1)(2,3)
11 = Generic Timer (TMRCK) external input
10 = LPRC Oscillator
01 = TxCK external clock input
00 = SOSC
bit 7
Unimplemented: Read as ‘0’
bit 6
TGATE: Timery Gated Time Accumulation Enable bit(2)
When TCS = 1:
This bit is ignored.
When TCS = 0:
1 = Gated time accumulation is enabled
0 = Gated time accumulation is disabled
bit 5-4
TCKPS<1:0>: Timery Input Clock Prescale Select bits(2)
11 = 1:256
10 = 1:64
01 = 1:8
00 = 1:1
bit 3-2
Unimplemented: Read as ‘0’
bit 1
TCS: Timery Clock Source Select bit(2,3)
1 = External clock from pin, TyCK (on the rising edge)
0 = Internal clock (FOSC/2)
bit 0
Unimplemented: Read as ‘0’
Note 1:
2:
3:
Changing the value of TyCON while the timer is running (TON = 1) causes the timer prescale counter to
reset and is not recommended.
When 32-bit operation is enabled (T2CON<3> or T4CON<3> = 1), these bits have no effect on Timery
operation; all timer functions are set through T2CON and T4CON.
If TCS = 1 and TECS<1:0> = x1, the selected external timer input (TyCK) must be configured to an
available RPn/RPIn pin. For more information, see Section 11.4 “Peripheral Pin Select (PPS)”.
DS30010089C-page 252
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
14.0
Note:
CAPTURE/COMPARE/PWM/
TIMER MODULES (MCCP AND
SCCP)
This data sheet summarizes the features of
this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information on the
MCCP/SCCP modules, refer to the
“dsPIC33/PIC24
Family
Reference
Manual”, “Capture/Compare/PWM/Timer
(MCCP and SCCP)” (DS33035).
PIC24FJ256GA412/GB412 family devices include
several Capture/Compare/PWM/Timer base modules,
which provide the functionality of three different peripherals of earlier PIC24F devices. The module can operate
in one of three major modes:
• General Purpose Timer
• Input Capture
• Output Compare/PWM
The module is provided in two different forms, distinguished by the number of PWM outputs that the
module can generate. Single output modules (SCCPs)
provide only one PWM output. Multiple output modules
(MCCPs) can provide up to six outputs and an
extended range of power control features, depending
on the pin count of the particular device. All other
features of the modules are identical.
A conceptual block diagram for the module is shown in
Figure 14-1. All three modes share a time base generator and a common Timer register pair (CCPxTMRH/L);
other shared hardware components are added as a
particular mode requires.
Each module has a total of seven control and status
registers:
•
•
•
•
•
•
•
CCPxCON1L (Register 14-1)
CCPxCON1H (Register 14-2)
CCPxCON2L (Register 14-3)
CCPxCON2H (Register 14-4)
CCPxCON3L (Register 14-5)
CCPxCON3H (Register 14-6)
CCPxSTATL (Register 14-7)
Each module also includes eight buffer/counter registers that serve as Timer Value registers or data holding
buffers:
• CCPxTMRH/CCPxTMRL (CCPx Timer High/Low
Counters)
• CCPxPRH/CCPxPRL (CCPx Timer Period
High/Low)
• CCPxRAH/CCPxRAL (CCPx Primary Output
Compare Data High/Low Buffers)
• CCPxRBH/CCPxRBL (CCPx Secondary Output
Compare Data High/Low Buffers)
• CCPxBUFH/CCPxBUFL (CCPx Input Capture
High/Low Buffers)
The SCCP and MCCP modules can be operated only
in one of the three major modes at any time. The other
modes are not available unless the module is
reconfigured for the new mode.
FIGURE 14-1:
MCCPx/SCCPx CONCEPTUAL BLOCK DIAGRAM
CCPxIF
CCTxIF
External
Capture Input
Input Capture
Sync/Trigger Out
Special Trigger (to A/D)
Auxiliary Output (to CTMU)
Clock
Sources
Time Base
Generator
CCPxTMRH/L
Compare/PWM
Output(s)
T32
CCSEL
MOD<3:0>
Sync and
Gating
Sources
 2015 Microchip Technology Inc.
16/32-Bit
Timer
Output Compare/
PWM
OCFA/OCFB
DS30010089C-page 253
PIC24FJ256GA412/GB412 FAMILY
14.1
Time Base Generator
The Timer Clock Generator (TCG) generates a clock
for the module’s internal time base, using one of the
clock signals already available on the microcontroller.
This is used as the time reference for the module in its
three major modes. The internal time base is shown in
Figure 14-2.
FIGURE 14-2:
There are eight inputs available to the clock generator,
which are selected using the CLKSEL<2:0> bits
(CCPxCON1L<10:8>). Available sources include the
FRC and LPRC, the Secondary Oscillator and the TCKI
external clock inputs. The system clock is the default
source (CLKSEL<2:0> = 000).
TIMER CLOCK GENERATOR
Clock
Sources
TMRPS<1:0>
TMRSYNC
SSDG
Prescaler
Clock
Synchronizer
Gate(1)
To Rest
of Module
CLKSEL<2:0>
Note 1: Gating is available in Timer modes only.
14.2
General Purpose Timer
Timer mode is selected when CCSEL = 0 and
MOD<3:0> = 0000. The timer can function as a 32-bit
timer or a dual 16-bit timer, depending on the setting of
the T32 bit (Table 14-1).
TABLE 14-1:
TIMER OPERATION MODE
T32
(CCPxCON1L<5>)
Operating Mode
0
Dual Timer Mode (16-bit)
1
Timer Mode (32-bit)
Dual 16-Bit Timer mode provides a simple timer function with two independent 16-bit timer/counters. The
primary timer uses CCPxTMRL and CCPxPRL. Only
the primary timer can interact with other modules on
the device. It generates the MCCPx sync out signals for
use by other MCCP modules. It can also use the
SYNC<4:0> bits signal generated by other modules.
The secondary timer uses CCPxTMRH and CCPxPRH. It
is intended to be used only as a periodic interrupt source
for scheduling CPU events. It does not generate an output
sync/trigger signal like the primary time base. In Dual
Timer mode, the CCPx Secondary Timer Period register,
CCPxPRH, generates the MCCP compare event
(CCPxIF) used by many other modules on the device.
14.2.1
SYNC AND TRIGGER OPERATION
In both 16-bit and 32-bit modes, the timer can also
function in either synchronization (“sync”) or trigger
operation.
Both
use
the
SYNC<4:0>
bits
(CCPxCON1H<4:0>) to determine the input signal
source. The difference is how that signal affects the
timer.
In sync operation, the timer Reset or clear occurs when
the input selected by SYNC<4:0> is asserted. The
timer immediately begins to count again from zero
unless it is held for some other reason. Sync operation
is used whenever the TRIGEN bit (CCPxCON1H<7>)
is cleared. SYNC<4:0> can have any value except
‘11111’.
In trigger operation, the timer is held in Reset until the
input selected by SYNC<4:0> is asserted; when it
occurs, the timer starts counting. Trigger operation is
used whenever the TRIGEN bit is set. In Trigger mode,
the timer will continue running after a trigger event as
long as the CCPTRIG bit (CCPxSTATL<7>) is set. To
clear CCPTRIG, the TRCLR bit (CCPxSTATL<5>) must
be set to clear the trigger event, reset the timer and
hold it at zero until another trigger event occurs. On
PIC24FJ256GA412/GB412 family devices, trigger
operation can only be used when the system clock is
the time base source (CLKSEL<2:0> = 000).
The 32-Bit Timer mode uses the CCPxTMRL and
CCPxTMRH registers, together, as a single 32-bit timer.
When CCPxTMRL overflows, CCPxTMRH increments
by one. This mode provides a simple timer function
when it is important to track long time periods. Note that
the T32 bit (CCPxCON1L<5>) should be set before the
CCPxTMRL or CCPxPRH registers are written to
initialize the 32-bit timer.
DS30010089C-page 254
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
FIGURE 14-3:
DUAL 16-BIT TIMER MODE
CCPxPRL
Comparator
Sync/
Trigger
Control
SYNC<4:0>
CCPxTMRL
Comparator
Clock
Sources
Set CCTxIF
Special Event Trigger
Time Base
Generator
CCPxRBH/L
CCPxTMRH
Comparator
Set CCPxIF
CCPxPRH
FIGURE 14-4:
32-BIT TIMER MODE
Sync/
Trigger
Control
SYNC<4:0>
Clock
Sources
Time Base
Generator
CCPxTMRH
CCPxTMRL
Comparator
CCPxPRH
 2015 Microchip Technology Inc.
Set CCTxIF
CCPxPRL
DS30010089C-page 255
PIC24FJ256GA412/GB412 FAMILY
14.3
output pulses. Like most PIC® MCU peripherals, the
Output Compare x module can also generate interrupts
on a compare match event.
Output Compare Mode
Output Compare mode compares the Timer register
value with the value of one or two Compare registers,
depending on its mode of operation. The Output
Compare x module, on compare match events, has the
ability to generate a single output transition or a train of
TABLE 14-2:
Table 14-2 shows the various modes available in
Output Compare modes.
OUTPUT COMPARE/PWM MODES
MOD<3:0>
T32
(CCPxCON1L<3:0>) (CCPxCON1L<5>)
Operating Mode
0001
0
Output High on Compare (16-bit)
0001
0010
1
0
Output High on Compare (32-bit)
Output Low on Compare (16-bit)
0010
0011
1
0
Output Low on Compare (32-bit)
Output Toggle on Compare (16-bit)
0011
0100
1
0
Output Toggle on Compare (32-bit)
Dual Edge Compare (16-bit)
Dual Edge Mode
0101
0110
0
0
Dual Edge Compare (16-bit buffered)
Center-Aligned Pulse (16-bit buffered)
PWM Mode
Center PWM
0111
0111
0
1
Variable Frequency Pulse (16-bit)
Variable Frequency Pulse (32-bit)
FIGURE 14-5:
Single Edge Mode
OUTPUT COMPARE x BLOCK DIAGRAM
CCPxCON1H/L
CCPxCON2H/L
CCPxPRL
CCPxCON3H/L
Comparator
CCPxRAH/L
Rollover/Reset
CCPxRAH/L Buffer
Comparator
OCx Clock
Sources
Time Base
Generator
Increment
CCPxTMRH/L
Reset
Trigger and
Sync Sources
Trigger and
Sync Logic
Match Event
Comparator
Match
Event
Rollover
Match
Event
Edge
Detect
OCx Output,
Auto-Shutdown
and Polarity
Control
CCPx Pin(s)
OCFA/OCFB
Fault Logic
CCPxRBH/L Buffer
Rollover/Reset
CCPxRBH/L
Reset
DS30010089C-page 256
Output Compare
Interrupt
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
14.4
Input Capture Mode
Input Capture mode is used to capture a timer value
from an independent timer base upon an event on an
input pin or other internal trigger source. The input capture features are useful in applications requiring
frequency (time period) and pulse measurement.
Figure 14-6 depicts a simplified block diagram of Input
Capture mode.
TABLE 14-3:
Input Capture mode uses a dedicated 16/32-bit, synchronous, up counting timer for the capture function. The timer
value is written to the FIFO when a capture event occurs.
The internal value may be read (with a synchronization
delay) using the CCPxTMRH/L register.
To use Input Capture mode, the CCSEL bit
(CCPxCON1L<4>) must be set. The T32 and the
MOD<3:0> bits are used to select the proper Capture
mode, as shown in Table 14-3.
INPUT CAPTURE MODES
MOD<3:0>
(CCPxCON1L<3:0>)
T32
(CCPxCON1L<5>)
Operating Mode
0000
0
Edge Detect (16-bit capture)
0000
1
Edge Detect (32-bit capture)
0001
0
Every Rising (16-bit capture)
0001
1
Every Rising (32-bit capture)
0010
0
Every Falling (16-bit capture)
0010
1
Every Falling (32-bit capture)
0011
0
Every Rise/Fall (16-bit capture)
0011
1
Every Rise/Fall (32-bit capture)
0100
0
Every 4th Rising (16-bit capture)
0100
1
Every 4th Rising (32-bit capture)
0101
0
Every 16th Rising (16-bit capture)
0101
1
Every 16th Rising (32-bit capture)
FIGURE 14-6:
INPUT CAPTURE x BLOCK DIAGRAM
ICS<2:0>
ICx Clock
Sources
Clock
Select
MOD<3:0>
OPS<3:0>
Edge Detect Logic
and
Clock Synchronizer
Event and
Interrupt
Logic
Set CCPxIF
Increment
Reset
Trigger and
Sync Sources
Trigger and
Sync Logic
16
CCPxTMRH/L
4-Level FIFO Buffer
16
T32
16
CCPxBUFH/L
System Bus
 2015 Microchip Technology Inc.
DS30010089C-page 257
PIC24FJ256GA412/GB412 FAMILY
14.5
Auxiliary Output
The MCCPx and SCCPx modules have an auxiliary
(secondary) output that provides other peripherals
access to internal module signals. The auxiliary output
is intended to connect to other MCCP or SCCP
modules, or other digital peripherals, to provide these
types of functions:
The type of output signal is selected using the
AUXOUT<1:0> control bits (CCPxCON2H<4:3>). The
type of output signal is also dependent on the module
operating mode.
On the PIC24FJ256GA412/GB412 family of devices,
only the CTMU discharge trigger has access to the
auxiliary output signal.
• Time Base Synchronization
• Peripheral Trigger and Clock Inputs
• Signal Gating
TABLE 14-4:
AUXILIARY OUTPUT
AUXOUT<1:0>
CCSEL
MOD<3:0>
Comments
Signal Description
00
x
xxxx
Auxiliary output disabled
No Output
01
0
0000
Time Base modes
Time Base Period Reset or Rollover
10
Special Event Trigger Output
11
No Output
01
0
10
11
01
1
0001
through
1111
xxxx
Output Compare modes
Time Base Period Reset or Rollover
Output Compare Event Signal
Output Compare Signal
Input Capture modes
Time Base Period Reset or Rollover
10
Reflects the Value of the ICDIS bit
11
Input Capture Event Signal
DS30010089C-page 258
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 14-1:
CCPxCON1L: CCPx CONTROL 1 LOW REGISTERS
R/W-0
U-0
R/W-0
r-0
R/W-0
R/W-0
R/W-0
R/W-0
CCPON
—
CCPSIDL
—
TMRSYNC
CLKSEL2
CLKSEL1
CLKSEL0
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
TMRPS1
TMRPS0
T32
CCSEL
MOD3
MOD2
MOD1
MOD0
bit 7
bit 0
Legend:
r = Reserved bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
CCPON: CCPx Module Enable bit
1 = Module is enabled with an operating mode specified by the MOD<3:0> control bits
0 = Module is disabled
bit 14
Unimplemented: Read as ‘0’
bit 13
CCPSIDL: CCPx Stop in Idle Mode Bit
1 = Discontinues module operation when device enters Idle mode
0 = Continues module operation in Idle mode
bit 12
Reserved: Maintain as ‘0’
bit 11
TMRSYNC: Time Base Clock Synchronization bit
1 = Asynchronous module time base clock is selected and synchronized to the internal system clocks
(CLKSEL<2:0>  000)
0 = Synchronous module time base clock is selected and does not require synchronization
(CLKSEL<2:0> = 000)
bit 10-8
CLKSEL<2:0>: CCPx Time Base Clock Select bits
111 = External TCKIB input
110 = External TCKIA input
101 = CLC1
100 = 2 * System Clock
011 = CLCx output, as determined by the MCCPx or SCCPx module (see Table 14-5)
010 = Secondary Oscillator (SOSC)
001 = Reference clock (REFO)
000 = System clock (TCY)
bit 7-6
TMRPS<1:0>: Time Base Prescale Select bits
11 = 1:64 Prescaler
10 = 1:16 Prescaler
01 = 1:4 Prescaler
00 = 1:1 Prescaler
bit 5
T32: 32-Bit Time Base Select bit
1 = Uses 32-bit time base for timer, single edge output compare or input capture function
0 = Uses 16-bit time base for timer, single edge output compare or input capture function
bit 4
CCSEL: Capture/Compare Mode Select bit
1 = Input Capture peripheral
0 = Output Compare/PWM/Timer peripheral (exact function is selected by the MOD<3:0> bits)
 2015 Microchip Technology Inc.
DS30010089C-page 259
PIC24FJ256GA412/GB412 FAMILY
REGISTER 14-1:
bit 3-0
TABLE 14-5:
CCPxCON1L: CCPx CONTROL 1 LOW REGISTERS (CONTINUED)
MOD<3:0>: CCPx Mode Select bits
For CCSEL = 1 (Input Capture Modes):
1xxx = Reserved
011x = Reserved
0101 = Capture every 16th rising edge
0100 = Capture every 4th rising edge
0011 = Capture every rising and falling edge
0010 = Capture every falling edge
0001 = Capture every rising edge
0000 = Capture every rising and falling edge (Edge Detect mode)
For CCSEL = 0 (Output Compare/Timer Modes):
1111 = External Input mode: Pulse generator is disabled, source is selected by ICS<2:0>
1110 = Reserved
110x = Reserved
10xx = Reserved
0111 = Variable Frequency Pulse mode
0110 = Center-Aligned Pulse Compare mode, buffered
0101 = Dual Edge Compare mode, buffered
0100 = Dual Edge Compare mode
0011 = 16-Bit/32-Bit Single Edge mode, toggles output on compare match
0010 = 16-Bit/32-Bit Single Edge mode, drives output low on compare match
0001 = 16-Bit/32-Bit Single Edge mode, drives output high on compare match
0000 = 16-Bit/32-Bit Timer mode, output functions are disabled
CLC CLOCK SOURCE SELECTION (CLKSEL<2:0> = 011)
MCCP/SCCP Module
CLC Module for Clock Source
DS30010089C-page 260
MCCP1
MCCP2
MCCP3
SCCP4
SCCP5
SCCP6
SCCP7
1
2
3
1
2
3
4
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 14-2:
R/W-0
CCPxCON1H: CCPx CONTROL 1 HIGH REGISTERS
R/W-0
(1)
OPSSRC
U-0
(2)
RTRGEN
—
U-0
R/W-0
(3)
—
OPS3
R/W-0
OPS2
(3)
R/W-0
OPS1
(3)
R/W-0
OPS0(3)
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
TRIGEN
ONESHOT
ALTSYNC
SYNC4
SYNC3
SYNC2
SYNC1
SYNC0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
OPSSRC: Output Postscaler Source Select bit(1)
1 = Output postscaler scales module trigger output events
0 = Output postscaler scales time base interrupt events
bit 14
RTRGEN: Retrigger Enable bit(2)
1 = Time base can be retriggered when TRIGEN bit = 1
0 = Time base may not be retriggered when TRIGEN bit = 1
bit 13-12
Unimplemented: Read as ‘0’
bit 11-8
OPS3<3:0>: CCPx Interrupt Output Postscale Select bits(3)
1111 = Interrupt every 16th time base period match
1110 = Interrupt every 15th time base period match
...
0100 = Interrupt every 5th time base period match
0011 = Interrupt every 4th time base period match or 4th input capture event
0010 = Interrupt every 3rd time base period match or 3rd input capture event
0001 = Interrupt every 2nd time base period match or 2nd input capture event
0000 = Interrupt after each time base period match or input capture event
bit 7
TRIGEN: CCPx Trigger Enable bit
1 = Trigger operation of time base is enabled
0 = Trigger operation of time base is disabled
bit 6
ONESHOT: One-Shot Mode Enable bit
1 = One-Shot Trigger mode is enabled; trigger duration is set by OSCNT<2:0>
0 = One-Shot Trigger mode is disabled
bit 5
ALTSYNC: CCPx Clock Select bits
1 = An alternate signal is used as the module synchronization output signal
0 = The module synchronization output signal is the Time Base Reset/rollover event
bit 4-0
SYNC<4:0>: CCPx Synchronization Source Select bits
See Table 14-6 for the definition of inputs.
Note 1:
2:
3:
This control bit has no function in Input Capture modes.
This control bit has no function when TRIGEN = 0.
Output postscale settings, from 1:5 to 1:16 (‘0100’ to ‘1111’), will result in a FIFO buffer overflow for
Input Capture modes.
 2015 Microchip Technology Inc.
DS30010089C-page 261
PIC24FJ256GA412/GB412 FAMILY
TABLE 14-6:
SYNCHRONIZATION SOURCES
SYNC<4:0>
00000
None; Timer with Rollover on CCPxPRH/L Match or FFFFh
00001
Module’s Own Timer Sync Out
00010
MCCP1 Sync Output
00011
MCCP2 Sync Output
00100
MCCP3 Sync Output
00101
SCCP4 Sync Output
00110
SCCP5 Sync Output
00111
SCCP6 Sync Output
01000
SCCP7 Sync Output
01001
INT0
01010
INT1
01011
INT2
01100 to 01111
Unused
10000
CLC1 Output(1)
10010
CLC2 Output(1)
10011
CLC3 Output(1)
10100
CLC4 Output(1)
10101 to 10111
Unused
11000
Comparator 3 Trigger
11001
Comparator 2 Trigger
11010
Comparator 1 Trigger
11011
A/D(1)
11100
11101 and 11110
11111
Note 1:
Synchronization Source
CTMU Trigger
Unused
None; Timer with Auto-Rollover (FFFFh → 0000h)
These sources are only available when the source module is being used in a Synchronous mode.
DS30010089C-page 262
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 14-3:
CCPxCON2L: CCPx CONTROL 2 LOW REGISTERS
R/W-0
R/W-0
U-0
R/W-0
U-0
U-0
U-0
U-0
PWMRSEN
ASDGM
—
SSDG
—
—
—
—
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
ASDG7
ASDG6
ASDG5
ASDG4
ASDG3
ASDG2
ASDG1
ASDG0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
PWMRSEN: CCPx PWM Restart Enable bit
1 = ASEVT bit clears automatically at the beginning of the next PWM period, after the shutdown input
has ended
0 = ASEVT bit must be cleared in software to resume PWM activity on output pins
bit 14
ASDGM: CCPx Auto-Shutdown Gate Mode Enable bit
1 = Waits until the next Time Base Reset or rollover for shutdown to occur
0 = Shutdown event occurs immediately
bit 13
Unimplemented: Read as ‘0’
bit 12
SSDG: CCPx Software Shutdown/Gate Control bit
1 = Manually forces auto-shutdown, timer clock gate or input capture signal gate event (setting of
ASDGM bit still applies)
0 = Normal module operation
bit 11-8
Unimplemented: Read as ‘0’
bit 7-0
ASDG<7:0>: CCPx Auto-Shutdown/Gating Source Enable bits
1 = ASDGx Source n is enabled (see Table 14-7 for auto-shutdown/gating sources)
0 = ASDGx Source n is disabled
TABLE 14-7:
ASDG<x>
Bit
AUTO-SHUTDOWN AND GATING SOURCES
Auto-Shutdown/Gating Source
MCCP1
MCCP2
MCCP3
SCCP4
SCCP5
0
Comparator 1 Output
1
Comparator 2 Output
2
3
4
5
SCCP6
SCCP7
Comparator 3 Output
SCCP4 Output Compare
MCCP1 Output Compare
SCCP5 Output Compare
MCCP2 Output Compare
CLC1 Output CLC2 Output CLC3 Output CLC1 Output CLC2 Output CLC3 Output CLC4 Output
6
OCFA Fault Input
7
OCFB Fault Input
 2015 Microchip Technology Inc.
DS30010089C-page 263
PIC24FJ256GA412/GB412 FAMILY
REGISTER 14-4:
R/W-0
CCPxCON2H: CCPx CONTROL 2 HIGH REGISTERS
U-0
OENSYNC
—
R/W-0
(1)
OCFEN
R/W-0
(1)
OCEEN
R/W-0
OCDEN
(1)
R/W-0
R/W-0
(1)
(1)
OCCEN
OCBEN
R/W-0
OCAEN
bit 15
bit 8
R/W-0
ICGSM1
R/W-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
ICGSM0
—
AUXOUT1
AUXOUT0
ICS2
ICS1
ICS0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
OENSYNC: Output Enable Synchronization bit
1 = Update by output enable bits occurs on the next Time Base Reset or rollover
0 = Update by output enable bits occurs immediately
bit 14
Unimplemented: Read as ‘0’
bit 13-8
OC<F:A>EN: Output Enable/Steering Control bits(1)
1 = OCx pin is controlled by the CCPx module and produces an output compare or PWM signal
0 = OCx pin is not controlled by the CCPx module; the pin is available to the port logic or another
peripheral multiplexed on the pin
bit 7-6
ICGSM<1:0>: Input Capture Gating Source Mode Control bits
11 = Reserved
10 = One-Shot mode: Falling edge from gating source disables future capture events (ICDIS = 1)
01 = One-Shot mode: Rising edge from gating source enables future capture events (ICDIS = 0)
00 = Level-Sensitive mode: A high level from gating source will enable future capture events; a low
level will disable future capture events
bit 5
Unimplemented: Read as ‘0’
bit 4-3
AUXOUT<1:0>: Auxiliary Output Signal on Event Selection bits
11 = Input capture or output compare event; no signal in Timer mode
10 = Signal output is defined by module operating mode (see Table 14-4)
01 = Time base rollover event (all modes)
00 = Disabled
bit 2-0
ICS<2:0>: Input Capture Source Select bits
111 = CLC4 output
110 = CLC3 output
101 = CLC2 output
100 = CLC1 output
011 = Comparator 3 output
010 = Comparator 2 output
001 = Comparator 1 output
000 = MCCP Input Capture x (ICMx) pin
Note 1:
OCFEN through OCBEN (bits<13:9>) are implemented in MCCPx modules only.
DS30010089C-page 264
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 14-5:
CCPxCON3L: CCPx CONTROL 3 LOW REGISTERS(1)
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
U-0
U-0
—
—
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
DT<5:0>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-6
Unimplemented: Read as ‘0’
bit 5-0
DT<5:0>: CCPx Dead-Time Select bits
111111 = Inserts 63 dead-time delay periods between complementary output signals
111110 = Inserts 62 dead-time delay periods between complementary output signals
...
000010 = Inserts 2 dead-time delay periods between complementary output signals
000001 = Inserts 1 dead-time delay period between complementary output signals
000000 = Dead-time logic is disabled
Note 1:
This register is implemented in MCCPx modules only.
 2015 Microchip Technology Inc.
DS30010089C-page 265
PIC24FJ256GA412/GB412 FAMILY
REGISTER 14-6:
R/W-0
CCPxCON3H: CCPx CONTROL 3 HIGH REGISTERS
R/W-0
OETRIG
OSCNT2
R/W-0
R/W-0
OSCNT1
U-0
OSCNT0
—
R/W-0
OUTM2
R/W-0
(1)
OUTM1
R/W-0
(1)
OUTM0(1)
bit 15
bit 8
U-0
U-0
—
—
R/W-0
POLACE
R/W-0
R/W-0
(1)
POLBDF
PSSACE1
R/W-0
PSSACE0
R/W-0
PSSBDF1
R/W-0
(1)
PSSBDF0(1)
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
OETRIG: CCPx Dead-Time Select bit
1 = For Triggered mode (TRIGEN = 1): Module does not drive enabled output pins until triggered
0 = Normal output pin operation
bit 14-12
OSCNT<2:0>: One-Shot Event Count bits
111 = Extends one-shot event by 7 time base periods (8 time base periods total)
110 = Extends one-shot event by 6 time base periods (7 time base periods total)
101 = Extends one-shot event by 5 time base periods (6 time base periods total)
100 = Extends one-shot event by 4 time base periods (5 time base periods total)
011 = Extends one-shot event by 3 time base periods (4 time base periods total)
010 = Extends one-shot event by 2 time base periods (3 time base periods total)
001 = Extends one-shot event by 1 time base period (2 time base periods total)
000 = Does not extend one-shot trigger event
bit 11
Unimplemented: Read as ‘0’
bit 10-8
OUTM<2:0>: PWMx Output Mode Control bits(1)
111 = Reserved
110 = Output Scan mode
101 = Brush DC Output mode, forward
100 = Brush DC Output mode, reverse
011 = Reserved
010 = Half-Bridge Output mode
001 = Push-Pull Output mode
000 = Steerable Single Output mode
bit 7-6
Unimplemented: Read as ‘0’
bit 5
POLACE: CCPx Output Pins, OCxA, OCxC and OCxE, Polarity Control bit
1 = Output pin polarity is active-low
0 = Output pin polarity is active-high
bit 4
POLBDF: CCPx Output Pins, OCxB, OCxD and OCxF, Polarity Control bit(1)
1 = Output pin polarity is active-low
0 = Output pin polarity is active-high
bit 3-2
PSSACE<1:0>: PWMx Output Pins, OCxA, OCxC and OCxE, Shutdown State Control bits
11 = Pins are driven active when a shutdown event occurs
10 = Pins are driven inactive when a shutdown event occurs
0x = Pins are tri-stated when a shutdown event occurs
bit 1-0
PSSBDF<1:0>: PWMx Output Pins, OCxB, OCxD, and OCxF, Shutdown State Control bits(1)
11 = Pins are driven active when a shutdown event occurs
10 = Pins are driven inactive when a shutdown event occurs
0x = Pins are in a high-impedance state when a shutdown event occurs
Note 1:
These bits are implemented in MCCPx modules only.
DS30010089C-page 266
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 14-7:
CCPxSTATL: CCPx STATUS REGISTER
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
R-0
W1-0
W1-0
R/C-0
R/C-0
R/C-0
R/C-0
R/C-0
CCPTRIG
TRSET
TRCLR
ASEVT
SCEVT
ICDIS
ICOV
ICBNE
bit 7
bit 0
Legend:
C = Clearable bit
R = Readable bit
W1 = Write ‘1’ Only bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-8
Unimplemented: Read as ‘0’
bit 7
CCPTRIG: CCPx Trigger Status bit
1 = Timer has been triggered and is running
0 = Timer has not been triggered and is held in Reset
bit 6
TRSET: CCPx Trigger Set Request bit
Writes ‘1’ to this location to trigger the timer when TRIGEN = 1 (location always reads as ‘0’).
bit 5
TRCLR: CCPx Trigger Clear Request bit
Writes ‘1’ to this location to cancel the timer trigger when TRIGEN = 1 (location always reads as ‘0’).
bit 4
ASEVT: CCPx Auto-Shutdown Event Status/Control bit
1 = A shutdown event is in progress; CCPx outputs are in the shutdown state
0 = CCPx outputs operate normally
bit 3
SCEVT: Single Edge Compare Event Status bit
1 = A single edge compare event has occurred
0 = A single edge compare event has not occurred
bit 2
ICDIS: Input Capture x Disable bit
1 = Event on Input Capture x pin (ICx) does not generate a capture event
0 = Event on Input Capture x pin will generate a capture event
bit 1
ICOV: Input Capture x Buffer Overflow Status bit
1 = The Input Capture x FIFO buffer has overflowed
0 = The Input Capture x FIFO buffer has not overflowed
bit 0
ICBNE: Input Capture x Buffer Status bit
1 = Input Capture x buffer has data available
0 = Input Capture x buffer is empty
 2015 Microchip Technology Inc.
DS30010089C-page 267
PIC24FJ256GA412/GB412 FAMILY
NOTES:
DS30010089C-page 268
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
15.0
INPUT CAPTURE WITH
DEDICATED TIMERS
Note:
15.1
15.1.1
This data sheet summarizes the features of
this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to the
“dsPIC33/PIC24 Family Reference Manual”, “Input Capture” (DS70000352). The
information in this data sheet supersedes
the information in the FRM.
Devices in the PIC24FJ256GA412/GB412 family contain
six independent input capture modules. Each of the
modules offers a wide range of configuration and
operating options for capturing external pulse events
and generating interrupts.
Key features of the input capture module include:
• Hardware-Configurable for 32-Bit Operation in All
Modes by Cascading Two Adjacent Modules
• Synchronous and Trigger modes of Output
compare Operation, with up to 30 User-Selectable
Sync/Trigger Sources Available
• A 4-Level FIFO Buffer for Capturing and Holding
Timer Values for Several Events
• Configurable Interrupt Generation
• Up to 6 Clock Sources Available for Each Module,
Driving a Separate Internal 16-Bit Counter
The module is controlled through two registers: ICxCON1
(Register 15-1) and ICxCON2 (Register 15-2). A general
block diagram of the module is shown in Figure 15-1.
FIGURE 15-1:
SYNCHRONOUS AND TRIGGER
MODES
When the input capture module operates in a
Free-Running mode, the internal 16-bit counter,
ICxTMR, counts up continuously, wrapping around
from FFFFh to 0000h on each overflow. Its period is
synchronized to the selected external clock source.
When a capture event occurs, the current 16-bit value
of the internal counter is written to the FIFO buffer.
In Synchronous mode, the module begins capturing
events on the ICx pin as soon as its selected clock
source is enabled. Whenever an event occurs on the
selected sync source, the internal counter is reset. In
Trigger mode, the module waits for a sync event from
another internal module to occur before allowing the
internal counter to run.
Standard, free-running operation is selected by setting
the SYNCSEL<4:0> bits (ICxCON2<4:0>) to ‘00000’
and clearing the ICTRIG bit (ICxCON2<7>). Synchronous and Trigger modes are selected any time the
SYNCSELx bits are set to any value except ‘00000’.
The ICTRIG bit selects either Synchronous or Trigger
mode; setting the bit selects Trigger mode operation. In
both modes, the SYNCSELx bits determine the
sync/trigger source.
When the SYNCSELx bits are set to ‘00000’ and
ICTRIG is set, the module operates in Software Trigger
mode. In this case, capture operations are started by
manually setting the TRIGSTAT bit (ICxCON2<6>).
INPUT CAPTURE x BLOCK DIAGRAM
ICM<2:0>
ICx Pin(1)
General Operating Modes
Prescaler
Counter
1:1/4/16
ICI<1:0>
Event and
Interrupt
Logic
Edge Detect Logic
and
Clock Synchronizer
Set ICxIF
ICTSEL<2:0>
ICx Clock
Sources
Clock
Select
Sync and
Trigger Sources
Sync and
Trigger
Logic
Increment
16
ICxTMR
Reset
ICxBUF
SYNCSEL<4:0>
Trigger
Note 1:
16
4-Level FIFO Buffer
ICOV, ICBNE
16
System Bus
The ICx inputs must be assigned to an available RPn/RPIn pin before use. See Section 11.4 “Peripheral Pin
Select (PPS)” for more information.
 2015 Microchip Technology Inc.
DS30010089C-page 269
PIC24FJ256GA412/GB412 FAMILY
15.1.2
CASCADED (32-BIT) MODE
By default, each module operates independently with
its own 16-bit timer. To increase resolution, adjacent
even and odd modules can be configured to function as
a single 32-bit module. (For example, Modules 1 and 2
are paired, as are Modules 3 and 4, and so on.) The
odd numbered module, Input Capture x (ICx), provides
the Least Significant 16 bits of the 32-bit register pairs
and the even numbered module, Input Capture y (ICy),
provides the Most Significant 16 bits. Wrap arounds of
the ICx registers cause an increment of their
corresponding ICy registers.
For 32-bit cascaded operations, the setup procedure is
slightly different:
1.
2.
3.
Cascaded operation is configured in hardware by
setting the IC32 bits (ICxCON2<8>) for both modules.
15.2
Capture Operations
The input capture module can be configured to capture
timer values and generate interrupts on rising edges on
ICx or all transitions on ICx. Captures can be configured to occur on all rising edges or just some (every 4th
or 16th). Interrupts can be independently configured to
generate on each event or a subset of events.
4.
5.
Note:
To set up the module for capture operations:
1.
2.
3.
4.
5.
6.
7.
8.
9.
Configure the ICx input for one of the available
Peripheral Pin Select pins.
If Synchronous mode is to be used, disable the
sync source before proceeding.
Make sure that any previous data has been
removed from the FIFO by reading ICxBUF until
the ICBNE bit (ICxCON1<3>) is cleared.
Set the SYNCSELx bits (ICxCON2<4:0>) to the
desired sync/trigger source.
Set the ICTSELx bits (ICxCON1<12:10>) for the
desired clock source.
Set the ICIx bits (ICxCON1<6:5>) to the desired
interrupt frequency
Select Synchronous or Trigger mode operation:
a) Check that the SYNCSELx bits are not set
to ‘00000’.
b) For Synchronous mode, clear the ICTRIG
bit (ICxCON2<7>).
c) For Trigger mode, set ICTRIG and clear the
TRIGSTAT bit (ICxCON2<6>).
Set the ICMx bits (ICxCON1<2:0>) to the
desired operational mode.
Enable the selected sync/trigger source.
DS30010089C-page 270
Set the IC32 bits for both modules
(ICyCON2<8>) and (ICxCON2<8>), enabling
the even numbered module first. This ensures
that the modules will start functioning in unison.
Set the ICTSELx and SYNCSELx bits for both
modules to select the same sync/trigger and
time base source. Set the even module first,
then the odd module. Both modules must use
the same ICTSELx and SYNCSELx bit settings.
Clear the ICTRIG bit of the even module
(ICyCON2<7>). This forces the module to run in
Synchronous mode with the odd module,
regardless of its trigger setting.
Use the odd module’s ICIx bits (ICxCON1<6:5>)
to set the desired interrupt frequency.
Use the ICTRIG bit of the odd module
(ICxCON2<7>) to configure Trigger or
Synchronous mode operation.
6.
For Synchronous mode operation, enable
the sync source as the last step. Both
input capture modules are held in Reset
until the sync source is enabled.
Use the ICMx bits of the odd module
(ICxCON1<2:0>) to set the desired Capture
mode.
The module is ready to capture events when the time
base and the sync/trigger source are enabled. When
the ICBNE bit (ICxCON1<3>) becomes set, at least
one capture value is available in the FIFO. Read input
capture values from the FIFO until the ICBNE clears
to ‘0’.
For 32-bit operation, read both the ICxBUF and
ICyBUF for the full 32-bit timer value (ICxBUF for the
lsw, ICyBUF for the msw). At least one capture value is
available in the FIFO buffer when the odd module’s
ICBNE bit (ICxCON1<3>) becomes set. Continue to
read the buffer registers until ICBNE is cleared
(performed automatically by hardware).
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 15-1:
ICxCON1: INPUT CAPTURE x CONTROL REGISTER 1
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
U-0
U-0
—
—
ICSIDL
ICTSEL2
ICTSEL1
ICTSEL0
—
—
bit 15
bit 8
U-0
R/W-0
R/W-0
R-0, HSC
R-0, HSC
R/W-0
R/W-0
R/W-0
—
ICI1
ICI0
ICOV
ICBNE
ICM2(1)
ICM1(1)
ICM0(1)
bit 7
bit 0
Legend:
HSC = Hardware Settable/Clearable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
Unimplemented: Read as ‘0’
bit 13
ICSIDL: Input Capture x Module Stop in Idle Control bit
1 = Input capture module halts in CPU Idle mode
0 = Input capture module continues to operate in CPU Idle mode
bit 12-10
ICTSEL<2:0>: Input Capture x Timer Select bits
111 = System clock (FOSC/2)
110 = Reserved
101 = Reserved
100 = Timer1
011 = Timer5
010 = Timer4
001 = Timer2
000 = Timer3
bit 9-7
Unimplemented: Read as ‘0’
bit 6-5
ICI<1:0>: Select Number of Captures per Interrupt bits
11 = Interrupt on every fourth capture event
10 = Interrupt on every third capture event
01 = Interrupt on every second capture event
00 = Interrupt on every capture event
bit 4
ICOV: Input Capture x Overflow Status Flag bit (read-only)
1 = Input capture overflow has occurred
0 = No input capture overflow has occurred
bit 3
ICBNE: Input Capture x Buffer Empty Status bit (read-only)
1 = Input capture buffer is not empty, at least one more capture value can be read
0 = Input capture buffer is empty
bit 2-0
ICM<2:0>: Input Capture x Mode Select bits(1)
111 = Interrupt mode: Input capture functions as an interrupt pin only when the device is in Sleep or
Idle mode (rising edge detect only, all other control bits are not applicable)
110 = Unused (module is disabled)
101 = Prescaler Capture mode: Capture on every 16th rising edge
100 = Prescaler Capture mode: Capture on every 4th rising edge
011 = Simple Capture mode: Capture on every rising edge
010 = Simple Capture mode: Capture on every falling edge
001 = Edge Detect Capture mode: Capture on every edge (rising and falling); ICI<1:0> bits do not
control interrupt generation for this mode
000 = Input capture module is turned off
Note 1:
The ICx input must also be configured to an available RPn/RPIn pin. For more information, see
Section 11.4 “Peripheral Pin Select (PPS)”.
 2015 Microchip Technology Inc.
DS30010089C-page 271
PIC24FJ256GA412/GB412 FAMILY
REGISTER 15-2:
ICxCON2: INPUT CAPTURE x CONTROL REGISTER 2
U-0
U-0
U-0
U-0
U-0
U-0
U-0
R/W-0
—
—
—
—
—
—
—
IC32
bit 15
bit 8
R/W-0
R/W-0, HS
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
ICTRIG
TRIGSTAT
—
SYNCSEL4
SYNCSEL3
SYNCSEL2
SYNCSEL1
SYNCSEL0
bit 7
bit 0
Legend:
HS = Hardware Settable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-9
Unimplemented: Read as ‘0’
bit 8
IC32: Cascade Two IC Modules Enable bit (32-bit operation)
1 = ICx and ICy operate in cascade as a 32-bit module (this bit must be set in both modules)
0 = ICx functions independently as a 16-bit module
bit 7
ICTRIG: ICx Sync/Trigger Select bit
1 = Triggers ICx from the source designated by the SYNCSELx bits
0 = Synchronizes ICx with the source designated by the SYNCSELx bits
bit 6
TRIGSTAT: Timer Trigger Status bit
1 = Timer source has been triggered and is running (set in hardware, can be set in software)
0 = Timer source has not been triggered and is being held clear
bit 5
Unimplemented: Read as ‘0’
Note 1:
2:
Use these inputs as trigger sources only and never as sync sources.
Never use an ICx module as its own trigger source by selecting this mode.
DS30010089C-page 272
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 15-2:
bit 4-0
Note 1:
2:
ICxCON2: INPUT CAPTURE x CONTROL REGISTER 2 (CONTINUED)
SYNCSEL<4:0>: Synchronization/Trigger Source Selection bits
1111x = Reserved
11101 = Reserved
11100 = CTMU(1)
11011 = A/D(1)
11010 = Comparator 3(1)
11001 = Comparator 2(1)
11000 = Comparator 1(1)
10111 = SCCP5 capture/compare
10110 = SCCP4 capture/compare
10101 = MCCP3 capture/compare
10100 = MCCP2 capture/compare
10011 = MCCP1 capture/compare
10010 = Input Capture 3(2)
10001 = Input Capture 2(2)
10000 = Input Capture 1(2)
01111 = SCCP7 capture/compare
01110 = SCCP6 capture/compare
01101 = Timer3
01100 = Timer2
01011 = Timer1
01010 = SCCP7 sync/trigger
01001 = SCCP6 sync/trigger
01000 = SCCP5 sync/trigger
00111 = SCCP4 sync/trigger
00110 = MCCP3 sync/trigger
00101 = MCCP2 sync/trigger
00100 = MCCP1 sync/trigger
00011 = Output Compare 3
00010 = Output Compare 2
00001 = Output Compare 1
00000 = Not synchronized to any other module
Use these inputs as trigger sources only and never as sync sources.
Never use an ICx module as its own trigger source by selecting this mode.
 2015 Microchip Technology Inc.
DS30010089C-page 273
PIC24FJ256GA412/GB412 FAMILY
NOTES:
DS30010089C-page 274
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
16.0
Note:
OUTPUT COMPARE WITH
DEDICATED TIMERS
This data sheet summarizes the features of
this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to the
“dsPIC33/PIC24 Family Reference Manual”, “Output Compare with Dedicated
Timer” (DS70005159). The information in
this data sheet supersedes the information
in the FRM.
Devices in the PIC24FJ256GA412/GB412 family all
feature six independent output compare modules. Each
of these modules offers a wide range of configuration
and operating options for generating pulse trains on
internal device events, and can produce Pulse-Width
Modulated (PWM) waveforms for driving power
applications.
Key features of the output compare module include:
• Hardware-Configurable for 32-Bit Operation in All
Modes by Cascading Two Adjacent Modules
• Synchronous and Trigger Modes of Output
Compare Operation, with up to 31 User-Selectable
Trigger/Sync Sources Available
• Two Separate Period Registers (a main register,
OCxR, and a secondary register, OCxRS) for
Greater Flexibility in Generating Pulses of Varying
Widths
• Configurable for Single Pulse or Continuous
Pulse Generation on an Output Event, or
Continuous PWM Waveform Generation
• Up to 6 Clock Sources Available for Each Module,
Driving a Separate Internal 16-Bit Counter
16.1
16.1.1
In Synchronous mode, the module begins performing
its compare or PWM operation as soon as its selected
clock source is enabled. Whenever an event occurs on
the selected sync source, the module’s internal counter
is reset. In Trigger mode, the module waits for a sync
event from another internal module to occur before
allowing the counter to run.
Free-Running mode is selected by default or any time
that the SYNCSEL<4:0> bits (OCxCON2<4:0>) are set
to ‘00000’. Synchronous or Trigger modes are selected
any time the SYNCSELx bits are set to any value except
‘00000’. The OCTRIG bit (OCxCON2<7>) selects either
Synchronous or Trigger mode; setting the bit selects
Trigger mode operation. In both modes, the SYNCSELx
bits determine the sync/trigger source.
16.1.2
CASCADED (32-BIT) MODE
By default, each module operates independently with
its own set of 16-bit Timer and Duty Cycle registers. To
increase resolution, adjacent even and odd modules
can be configured to function as a single 32-bit module.
(For example, Modules 1 and 2 are paired, as are
Modules 3 and 4, and so on.) The odd numbered
module, Output Compare x (OCx), provides the Least
Significant 16 bits of the 32-bit register pairs and the
even numbered module, Output Compare y (OCy),
provides the Most Significant 16 bits. Wrap arounds of
the OCx registers cause an increment of their
corresponding OCy registers.
Cascaded operation is configured in hardware by
setting the OC32 bit (OCxCON2<8>) for both modules.
For more information on cascading, refer to the
“dsPIC33/PIC24 Family Reference Manual”, “Output
Compare with Dedicated Timer” (DS70005159).
General Operating Modes
SYNCHRONOUS AND TRIGGER
MODES
When the output compare module operates in a
Free-Running mode, the internal 16-bit counter,
OCxTMR, runs counts up continuously, wrapping
around from 0xFFFF to 0x0000 on each overflow. Its
period is synchronized to the selected external clock
source. Compare or PWM events are generated each
time a match between the internal counter and one of
the Period registers occurs.
 2015 Microchip Technology Inc.
DS30010089C-page 275
PIC24FJ256GA412/GB412 FAMILY
FIGURE 16-1:
OUTPUT COMPARE x BLOCK DIAGRAM (16-BIT MODE)
OCM<2:0>
OCINV
OCTRIS
FLTOUT
FLTTRIEN
FLTMD
ENFLT<2:0>
OCFLT<2:0>
DCB<1:0>
OCxCON1
OCTSEL<2:0>
SYNCSEL<4:0>
TRIGSTAT
TRIGMODE
OCTRIG
Clock
Select
OCx Clock
Sources
OCxCON2
OCxR and
DCB<1:0>
Increment
Comparator
OCx Output and
OCxTMR
Fault Logic
Reset
Match Event
Trigger and
Sync Sources
Trigger and
Sync Logic
Comparator
OCx Pin(1)
Match Event
Match Event
OCFA/OCFB(2)
OCxRS
Reset
OCx Interrupt
Note 1:
2:
16.2
The OCx outputs must be assigned to an available RPn pin before use. For more information, see
Section 11.4 “Peripheral Pin Select (PPS)”.
The OCFA/OCFB Fault inputs must be assigned to an available RPn/RPIn pin before use. For more information,
see Section 11.4 “Peripheral Pin Select (PPS)”.
Compare Operations
In Compare mode (Figure 16-1), the output compare
module can be configured for single-shot or continuous
pulse generation. It can also repeatedly toggle an
output pin on each timer event.
To set up the module for compare operations:
1.
2.
Configure the OCx output for one of the
available Peripheral Pin Select pins.
Calculate the required values for the OCxR and
(for Double Compare modes) OCxRS Duty
Cycle registers:
a) Determine the instruction clock cycle time.
Take into account the frequency of the
external clock to the timer source (if one is
used) and the timer prescaler settings.
b) Calculate the time to the rising edge of the
output pulse relative to the timer start value
(0000h).
c) Calculate the time to the falling edge of the
pulse based on the desired pulse width and
the time to the rising edge of the pulse.
DS30010089C-page 276
3.
4.
5.
6.
7.
8.
Write the rising edge value to OCxR and the
falling edge value to OCxRS.
Set the Timer Period register, PRy, to a value
equal to or greater than the value in OCxRS.
Set the OCM<2:0> bits for the appropriate
compare operation (‘0xx’).
For Trigger mode operations, set OCTRIG to
enable Trigger mode. Set or clear TRIGMODE
to configure trigger operation and TRIGSTAT to
select a hardware or software trigger. For
Synchronous mode, clear OCTRIG.
Set the SYNCSEL<4:0> bits to configure the
trigger or synchronization source. If free-running
timer operation is required, set the SYNCSELx
bits to ‘00000’ (no sync/trigger source).
Select the time base source with the
OCTSEL<2:0> bits. If necessary, set the TON
bits for the selected timer, which enables the
compare time base to count. Synchronous
mode operation starts as soon as the time base
is enabled; Trigger mode operation starts after a
trigger source event occurs.
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
For 32-bit cascaded operation, these steps are also
necessary:
1.
2.
3.
4.
5.
6.
Set the OC32 bits for both registers
(OCyCON2<8>) and (OCxCON2<8>). Enable
the even numbered module first to ensure the
modules will start functioning in unison.
Clear the OCTRIG bit of the even module
(OCyCON2<7>), so the module will run in
Synchronous mode.
Configure the desired output and Fault settings
for OCy.
Force the output pin for OCx to the output state
by clearing the OCTRIS bit.
If Trigger mode operation is required, configure
the trigger options in OCx by using the OCTRIG
(OCxCON2<7>), TRIGMODE (OCxCON1<3>)
and SYNCSELx (OCxCON2<4:0>) bits.
Configure the desired Compare or PWM mode
of operation (OCM<2:0>) for OCy first, then for
OCx.
16.3
In PWM mode, the output compare module can be
configured for edge-aligned or center-aligned pulse
waveform generation. All PWM operations are
double-buffered (buffer registers are internal to the
module and are not mapped into SFR space).
To configure the output compare module for PWM
operation:
1.
2.
3.
4.
Depending on the output mode selected, the module
holds the OCx pin in its default state and forces a transition to the opposite state when OCxR matches the
timer. In Double Compare modes, OCx is forced back
to its default state when a match with OCxRS occurs.
The OCxIF interrupt flag is set after an OCxR match in
Single Compare modes and after each OCxRS match
in Double Compare modes.
5.
Single-shot pulse events only occur once, but may be
repeated by simply rewriting the value of the
OCxCON1 register. Continuous pulse events continue
indefinitely until terminated.
8.
 2015 Microchip Technology Inc.
Pulse-Width Modulation (PWM)
Mode
6.
7.
9.
Configure the OCx output for one of the
available Peripheral Pin Select pins.
Calculate the desired duty cycles and load them
into the OCxR register.
Calculate the desired period and load it into the
OCxRS register.
Select the current OCx as the synchronization
source by writing ‘0x1F’ to the SYNCSEL<4:0>
bits (OCxCON2<4:0>) and ‘0’ to the OCTRIG bit
(OCxCON2<7>).
Select a clock source by writing to the
OCTSEL<2:0> bits (OCxCON1<12:10>).
Enable interrupts, if required, for the timer and
output compare modules. The output compare
interrupt is required for PWM Fault pin
utilization.
Select the desired PWM mode in the OCM<2:0>
bits (OCxCON1<2:0>).
Appropriate Fault inputs may be enabled by
using the ENFLT<2:0> bits as described in
Register 16-1.
If a timer is selected as a clock source, set the
selected timer prescale value. The selected
timer’s prescaler output is used as the clock
input for the OCx timer and not the selected
timer output.
Note:
This peripheral contains input and output
functions that may need to be configured by
the Peripheral Pin Select. For more information, see Section 11.4 “Peripheral Pin
Select (PPS)”.
Note:
Make sure the I/O ports are in Digital mode
and the TRISx bits are configured for Output
mode for the peripheral pin selected.
DS30010089C-page 277
PIC24FJ256GA412/GB412 FAMILY
FIGURE 16-2:
OUTPUT COMPARE x BLOCK DIAGRAM (DOUBLE-BUFFERED,
16-BIT PWM MODE)
OCxCON1
OCxCON2
OCTSEL<2:0>
SYNCSEL<4:0>
TRIGSTAT
TRIGMODE
OCTRIG
OCxR and
DCB<1:0>
Rollover/Reset
OCxR and
DCB<1:0> Buffers
OCM<2:0>
OCINV
OCTRIS
FLTOUT
FLTTRIEN
FLTMD
ENFLT<2:0>
OCFLT<2:0>
DCB<1:0>
OCx Pin(1)
Clock
Select
OCx Clock
Sources
Increment
Comparator
OCxTMR
Reset
Trigger and
Sync Logic
Trigger and
Sync Sources
Match Event
Comparator
Match
Event
OCx Output and
Rollover
Fault Logic
OCFA/OCFB(2)
Match
Event
OCxRS Buffer
Rollover/Reset
OCxRS
OCx Interrupt
Reset
Note 1:
2:
16.3.1
The OCx outputs must be assigned to an available RPn pin before use. For more information, see
Section 11.4 “Peripheral Pin Select (PPS)”.
The OCFA/OCFB Fault inputs must be assigned to an available RPn/RPIn pin before use. For more information,
see Section 11.4 “Peripheral Pin Select (PPS)”.
PWM PERIOD
The PWM period is specified by writing to PRy, the
Timery Period register. The PWM period can be
calculated using Equation 16-1.
EQUATION 16-1:
Note:
A PRy value of N will produce a PWM
period of N + 1 time base count cycles.
For example, a value of 7 written into the
PRy register, will yield a period consisting
of 8 time base cycles.
CALCULATING THE PWM
PERIOD(1)
PWM Period = [(PRy) + 1] • TCY • (Timer Prescale Value)
where: PWM Frequency = 1/[PWM Period]
Note 1:
Based on TCY = TOSC * 2; Doze mode
and PLL are disabled.
DS30010089C-page 278
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
16.3.2
PWM DUTY CYCLE
Some important boundary parameters of the PWM duty
cycle include:
The PWM duty cycle is specified by writing to the
OCxRS and OCxR registers. The OCxRS and OCxR
registers can be written to at any time, but the duty
cycle value is not latched until a match between PRy
and TMRy occurs (i.e., the period is complete). This
provides a double buffer for the PWM duty cycle and is
essential for glitchless PWM operation.
• If OCxR, OCxRS and PRy are all loaded with
0000h, the OCx pin will remain low (0% duty cycle).
• If OCxRS is greater than PRy, the pin will remain
high (100% duty cycle).
See Example 16-1 for PWM mode timing details.
Table 16-1 and Table 16-2 show example PWM
frequencies and resolutions for a device operating at
4 MIPS and 10 MIPS, respectively.
CALCULATION FOR MAXIMUM PWM RESOLUTION(1)
EQUATION 16-2:
log10
Maximum PWM Resolution (bits) =
(
FCY
FPWM • (Timer Prescale Value)
log10(2)
)
bits
Note 1: Based on FCY = FOSC/2; Doze mode and PLL are disabled.
EXAMPLE 16-1:
1.
PWM PERIOD AND DUTY CYCLE CALCULATIONS(1)
Find the Timer Period register value for a desired PWM frequency of 52.08 kHz, where FOSC = 8 MHz with PLL
(32 MHz device clock rate) and a Timer2 prescaler setting of 1:1.
TCY = 2 * TOSC = 62.5 ns
PWM Period = 1/PWM Frequency = 1/52.08 kHz = 19.2 ms
PWM Period = (PR2 + 1) • TCY • (Timer2 Prescale Value)
19.2 s = (PR2 + 1) • 62.5 ns • 1
PR2 = 306
2.
Find the maximum resolution of the duty cycle that can be used with a 52.08 kHz frequency and a 32 MHz
device clock rate:
PWM Resolution = log10 (FCY/FPWM)/log102) bits
= (log10 (16 MHz/52.08 kHz)/log102) bits
= 8.3 bits
Note 1:
Based on TCY = 2 * TOSC; Doze mode and PLL are disabled.
TABLE 16-1:
EXAMPLE PWM FREQUENCIES AND RESOLUTIONS AT 4 MIPS (FCY = 4 MHz)(1)
PWM Frequency
7.6 Hz
61 Hz
122 Hz
977 Hz
3.9 kHz
31.3 kHz
125 kHz
Timer Prescaler Ratio
8
1
1
1
1
1
1
Period Register Value
FFFFh
FFFFh
7FFFh
0FFFh
03FFh
007Fh
001Fh
16
16
15
12
10
7
5
Resolution (bits)
Note 1:
Based on FCY = FOSC/2; Doze mode and PLL are disabled.
TABLE 16-2:
EXAMPLE PWM FREQUENCIES AND RESOLUTIONS AT 16 MIPS (FCY = 16 MHz)(1)
PWM Frequency
30.5 Hz
244 Hz
488 Hz
3.9 kHz
15.6 kHz
125 kHz
500 kHz
Timer Prescaler Ratio
8
1
1
1
1
1
1
Period Register Value
FFFFh
FFFFh
7FFFh
0FFFh
03FFh
007Fh
001Fh
16
16
15
12
10
7
5
Resolution (bits)
Note 1:
Based on FCY = FOSC/2; Doze mode and PLL are disabled.
 2015 Microchip Technology Inc.
DS30010089C-page 279
PIC24FJ256GA412/GB412 FAMILY
REGISTER 16-1:
OCxCON1: OUTPUT COMPARE x CONTROL REGISTER 1
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
OCSIDL
OCTSEL2
OCTSEL1
OCTSEL0
ENFLT2(2)
ENFLT1(2)
bit 15
bit 8
R/W-0
R/W-0, HSC
R/W-0, HSC
R/W-0, HSC
R/W-0
R/W-0
R/W-0
R/W-0
ENFLT0(2)
OCFLT2(2,3)
OCFLT1(2,4)
OCFLT0(2,4)
TRIGMODE
OCM2(1)
OCM1(1)
OCM0(1)
bit 7
bit 0
Legend:
HSC = Hardware Settable/Clearable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-14
Unimplemented: Read as ‘0’
bit 13
OCSIDL: Output Compare x Stop in Idle Mode Control bit
1 = Output Compare x halts in CPU Idle mode
0 = Output Compare x continues to operate in CPU Idle mode
bit 12-10
OCTSEL<2:0>: Output Compare x Timer Select bits
111 = Peripheral clock (FCY)
110 = Reserved
101 = Reserved
100 = Timer1 clock (only synchronous clock is supported)
011 = Timer5 clock
010 = Timer4 clock
001 = Timer3 clock
000 = Timer2 clock
bit 9
ENFLT2: Fault Input 2 Enable bit(2)
1 = Fault 2 (Comparator 1/2/3 out) is enabled(3)
0 = Fault 2 is disabled
bit 8
ENFLT1: Fault Input 1 Enable bit(2)
1 = Fault 1 (OCFB pin) is enabled(4)
0 = Fault 1 is disabled
bit 7
ENFLT0: Fault Input 0 Enable bit(2)
1 = Fault 0 (OCFA pin) is enabled(4)
0 = Fault 0 is disabled
bit 6
OCFLT2: PWM Fault 2 (Comparator 1/2/3) Condition Status bit(2,3)
1 = PWM Fault 2 has occurred
0 = No PWM Fault 2 has occurred
bit 5
OCFLT1: PWM Fault 1 (OCFB pin) Condition Status bit(2,4)
1 = PWM Fault 1 has occurred
0 = No PWM Fault 1 has occurred
Note 1:
2:
3:
4:
x = Bit is unknown
The OCx output must also be configured to an available RPn pin. For more information, see Section 11.4
“Peripheral Pin Select (PPS)”.
The Fault input enable and Fault status bits are valid when OCM<2:0> = 111 or 110.
The Comparator 1 output controls the OC1-OC2 channels; Comparator 2 output controls the OC3-OC4
channels; Comparator 3 output controls the OC5-OC6 channels.
The OCFA/OCFB Fault input must also be configured to an available RPn/RPIn pin. For more information,
see Section 11.4 “Peripheral Pin Select (PPS)”.
DS30010089C-page 280
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 16-1:
OCxCON1: OUTPUT COMPARE x CONTROL REGISTER 1 (CONTINUED)
bit 4
OCFLT0: PWM Fault 0 (OCFA pin) Condition Status bit(2,4)
1 = PWM Fault 0 has occurred
0 = No PWM Fault 0 has occurred
bit 3
TRIGMODE: Trigger Status Mode Select bit
1 = TRIGSTAT (OCxCON2<6>) is cleared when OCxRS = OCxTMR or in software
0 = TRIGSTAT is only cleared by software
bit 2-0
OCM<2:0>: Output Compare x Mode Select bits(1)
111 = Center-Aligned PWM mode on OCx(2)
110 = Edge-Aligned PWM mode on OCx(2)
101 = Double Compare Continuous Pulse mode: Initializes the OCx pin low; toggles the OCx state
continuously on alternate matches of OCxR and OCxRS
100 = Double Compare Single-Shot mode: Initializes the OCx pin low; toggles the OCx state on
matches of OCxR and OCxRS for one cycle
011 = Single Compare Continuous Pulse mode: Compare events continuously toggle the OCx pin
010 = Single Compare Single-Shot mode: Initializes OCx pin high; compare event forces the OCx pin low
001 = Single Compare Single-Shot mode: Initializes OCx pin low; compare event forces the OCx pin high
000 = Output compare channel is disabled
Note 1:
2:
3:
4:
The OCx output must also be configured to an available RPn pin. For more information, see Section 11.4
“Peripheral Pin Select (PPS)”.
The Fault input enable and Fault status bits are valid when OCM<2:0> = 111 or 110.
The Comparator 1 output controls the OC1-OC2 channels; Comparator 2 output controls the OC3-OC4
channels; Comparator 3 output controls the OC5-OC6 channels.
The OCFA/OCFB Fault input must also be configured to an available RPn/RPIn pin. For more information,
see Section 11.4 “Peripheral Pin Select (PPS)”.
 2015 Microchip Technology Inc.
DS30010089C-page 281
PIC24FJ256GA412/GB412 FAMILY
REGISTER 16-2:
OCxCON2: OUTPUT COMPARE x CONTROL REGISTER 2
R/W-0
R/W-0
R/W-0
R/W-0
U-0
R/W-0
R/W-0
R/W-0
FLTMD
FLTOUT
FLTTRIEN
OCINV
—
DCB1(3)
DCB0(3)
OC32
bit 15
bit 8
R/W-0
R/W-0, HS
R/W-0
R/W-0
R/W-1
R/W-1
R/W-0
R/W-0
OCTRIG
TRIGSTAT
OCTRIS
SYNCSEL4
SYNCSEL3
SYNCSEL2
SYNCSEL1
SYNCSEL0
bit 7
bit 0
Legend:
HS = Hardware Settable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
FLTMD: Fault Mode Select bit
1 = Fault mode is maintained until the Fault source is removed and the corresponding OCFLT0 bit is
cleared in software
0 = Fault mode is maintained until the Fault source is removed and a new PWM period starts
bit 14
FLTOUT: Fault Out bit
1 = PWM output is driven high on a Fault
0 = PWM output is driven low on a Fault
bit 13
FLTTRIEN: Fault Output State Select bit
1 = Pin is forced to an output on a Fault condition
0 = Pin I/O condition is unaffected by a Fault
bit 12
OCINV: Output Compare x Invert bit
1 = OCx output is inverted
0 = OCx output is not inverted
bit 11
Unimplemented: Read as ‘0’
bit 10-9
DCB<1:0>: PWM Duty Cycle Least Significant bits(3)
11 = Delays OCx falling edge by ¾ of the instruction cycle
10 = Delays OCx falling edge by ½ of the instruction cycle
01 = Delays OCx falling edge by ¼ of the instruction cycle
00 = OCx falling edge occurs at the start of the instruction cycle
bit 8
OC32: Cascade Two Output Compare Modules Enable bit (32-bit operation)
1 = Cascade module operation is enabled
0 = Cascade module operation is disabled
bit 7
OCTRIG: Output Compare x Trigger/Sync Select bit
1 = Triggers OCx from the source designated by the SYNCSELx bits
0 = Synchronizes OCx with the source designated by the SYNCSELx bits
bit 6
TRIGSTAT: Timer Trigger Status bit
1 = Timer source has been triggered and is running
0 = Timer source has not been triggered and is being held clear
bit 5
OCTRIS: Output Compare x Output Pin Direction Select bit
1 = OCx pin is tri-stated
0 = Output Compare Peripheral x is connected to an OCx pin
Note 1:
2:
3:
Never use an OCx module as its own trigger source, either by selecting this mode or another equivalent
SYNCSELx setting.
Use these inputs as trigger sources only and never as sync sources.
The DCB<1:0> bits are double-buffered in PWM modes only (OCM<2:0> (OCxCON1<2:0>) = 111, 110).
DS30010089C-page 282
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 16-2:
bit 4-0
OCxCON2: OUTPUT COMPARE x CONTROL REGISTER 2 (CONTINUED)
SYNCSEL<4:0>: Trigger/Synchronization Source Selection bits
11111 = This OC module(1)
11110 = OCTRIG1 external input
11101 = OCTRIG2 external input
11100 = CTMU(2)
11011 = A/D(2)
11010 = Comparator 3(2)
11001 = Comparator 2(2)
11000 = Comparator 1(2)
10111 = SCCP5 capture/compare
10110 = SCCP4 capture/compare
10101 = MCCP3 capture/compare
10100 = MCCP2 capture/compare
10011 = MCCP1 capture/compare
10010 = Input Capture 3(2)
10001 = Input Capture 2(2)
10000 = Input Capture 1(2)
01111 = SCCP7 capture/compare
01110 = SCCP6 capture/compare
01101 = Timer3
01100 = Timer2
01011 = Timer1
01010 = SCCP7 sync/trigger
01001 = SCCP6 sync/trigger
01000 = SCCP5 sync/trigger
00111 = SCCP4 sync/trigger
00110 = MCCP3 sync/trigger
00101 = MCCP2 sync/trigger
00100 = MCCP1 sync/trigger
00011 = Output Compare 5(1)
00010 = Output Compare 3(1)
00001 = Output Compare 1(1)
00000 = Not synchronized to any other module
Note 1:
2:
3:
Never use an OCx module as its own trigger source, either by selecting this mode or another equivalent
SYNCSELx setting.
Use these inputs as trigger sources only and never as sync sources.
The DCB<1:0> bits are double-buffered in PWM modes only (OCM<2:0> (OCxCON1<2:0>) = 111, 110).
 2015 Microchip Technology Inc.
DS30010089C-page 283
PIC24FJ256GA412/GB412 FAMILY
NOTES:
DS30010089C-page 284
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
17.0
Note:
SERIAL PERIPHERAL
INTERFACE (SPI)
This data sheet summarizes the features of
the PIC24FJ256GA412/GB412 family of
devices. It is not intended to be a comprehensive reference source. To complement
the information in this data sheet, refer to
the “dsPIC33/PIC24 Family Reference
Manual”, “Serial Peripheral Interface
(SPI) with Audio Codec Support”
(DS70005136), which is available from the
Microchip web site (www.microchip.com).
The Serial Peripheral Interface (SPI) module is a
synchronous serial interface useful for communicating
with other peripheral or microcontroller devices. These
peripheral devices may be serial EEPROMs, shift
registers, display drivers, A/D Converters, etc. The SPI
module is compatible with the Motorola® SPI and SIOP
interfaces. All devices in the PIC24FJ256GA412/GB412
family include three SPI modules.
The module supports operation in two buffer modes. In
Standard mode, data is shifted through a single serial
buffer. In Enhanced Buffer mode, data is shifted
through a FIFO buffer. The FIFO level depends on the
configured mode.
The SPI serial interface consists of four pins:
•
•
•
•
The SPI module can be configured to operate using 2,
3 or 4 pins. In the 3-pin mode, SSx is not used. In the
2-pin mode, both SDOx and SSx are not used.
The SPI module has the ability to generate three interrupts reflecting the events that occur during the data
communication. The following types of interrupts can
be generated:
1.
Do not perform Read-Modify-Write operations (such as bit-oriented instructions) on
the SPIxBUF register in either Standard or
Enhanced Buffer mode.
The module also supports a basic framed SPI protocol
while operating in either Master or Slave mode. A total
of four framed SPI configurations are supported.
The module also supports Audio modes. Four different
Audio modes are available.
•
•
•
•
I2S mode
Left Justified
Right Justified
PCM/DSP
In each of these modes, the serial clock is free-running
and audio data is always transferred.
If an audio protocol data transfer takes place between
two devices, then usually one device is the master and
the other is the slave. However, audio data can be
transferred between two slaves. Because the audio
protocols require free-running clocks, the master can
be a third party controller. In either case, the master
generates two free-running clocks: SCKx and LRC
(Left, Right Channel Clock/SSx/FSYNC).
 2015 Microchip Technology Inc.
Receive interrupts are signalled by SPIxRXIF.
This event occurs when:
- RX watermark interrupt
- SPIROV = 1
- SPIRBF = 1
- SPIRBE = 1
provided the respective mask bits are enabled in
SPIxIMSKL/H.
2.
Variable length data can be transmitted and received,
from 2 to 32-bits.
Note:
SDIx: Serial Data Input
SDOx: Serial Data Output
SCKx: Shift Clock Input or Output
SSx: Active-Low Slave Select or Frame
Synchronization I/O Pulse
Transmit interrupts are signalled by SPIxTXIF.
This event occurs when:
- TX watermark interrupt
- SPITUR = 1
- SPITBF = 1
- SPITBE = 1
provided the respective mask bits are enabled in
SPIxIMSKL/H.
3.
General interrupts are signalled by SPIxIF. This
event occurs when
- FRMERR = 1
- SPIBUSY = 1
- SRMT = 1
provided the respective mask bits are enabled in
SPIxIMSKL/H.
Block diagrams of the module in Standard and Enhanced
modes are shown in Figure 17-1 and Figure 17-2.
Note:
In this section, the SPI modules are
referred to together as SPIx, or separately
as SPI1, SPI2 or SPI3. Special Function
Registers will follow a similar notation. For
example, SPIxCON1 and SPIxCON2
refer to the control registers for any of the
three SPI modules.
DS30010089C-page 285
PIC24FJ256GA412/GB412 FAMILY
To set up the SPIx module for the Standard Master
mode of operation:
To set up the SPIx module for the Standard Slave mode
of operation:
1.
1.
2.
2.
3.
4.
5.
If using interrupts:
a) Clear the interrupt flag bits in the respective
IFSx register.
b) Set the interrupt enable bits in the
respective IECx register.
c) Write the SPIxIP bits in the respective IPCx
register to set the interrupt priority.
Write the desired settings to the SPIxCON1L
and SPIxCON1H registers with the MSTEN bit
(SPIxCON1L<5>) = 1.
Clear the SPIROV bit (SPIxSTATL<6>).
Enable SPIx operation by setting the SPIEN bit
(SPIxCON1L<15>).
Write the data to be transmitted to the SPIxBUFL
and SPIxBUFH registers. Transmission (and
reception) will start as soon as data is written to
the SPIxBUFL and SPIxBUFH registers.
FIGURE 17-1:
3.
4.
5.
6.
7.
Clear the SPIxBUF registers.
If using interrupts:
a) Clear the SPIxBUFL and SPIxBUFH
registers.
b) Set the interrupt enable bits in the
respective IECx register.
c) Write the SPIxIP bits in the respective IPCx
register to set the interrupt priority.
Write the desired settings to the SPIxCON1L,
SPIxCON1H and SPIxCON2L registers with
the MSTEN bit (SPIxCON1L<5>) = 0.
Clear the SMP bit.
If the CKE bit (SPIxCON1L<8>) is set, then the
SSEN bit (SPIxCON1L<7>) must be set to
enable the SSx pin.
Clear the SPIROV bit (SPIxSTATL<6>).
Enable SPIx operation by setting the SPIEN bit
(SPIxCON1L<15>).
SPIx MODULE BLOCK DIAGRAM (STANDARD MODE)
Internal
Data Bus
Write
Read
SPIxTXB
SPIxRXB
SPIxURDT
MSB
Receive
Transmit
SPIxTXSR
SPIxRXSR
SDIx
MSB
0
Shift
Control
SDOx
SSx/FSYNC
SSx & FSYNC
Control
Clock
Control
1
TXELM<5:0> = 6’b0
URDTEN
Edge
Select
MCLKEN
MCLK
Baud Rate
Generator
PBCLK
SCKx
Edge
Select
DS30010089C-page 286
Clock
Control
Enable Master Clock
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
To set up the SPIx module for the Enhanced Buffer
Master mode of operation:
To set up the SPIx module for the Enhanced Buffer
Slave mode of operation:
1.
1.
2.
2.
3.
4.
5.
6.
If using interrupts:
a) Clear the interrupt flag bits in the respective
IFSx register.
b) Set the interrupt enable bits in the
respective IECx register.
c) Write the SPIxIP bits in the respective IPCx
register.
Write the desired settings to the SPIxCON1L,
SPIxCON1H and SPIxCON2L registers with
MSTEN (SPIxCON1L<5>) = 1.
Clear the SPIROV bit (SPIxSTATL<6>).
Select Enhanced Buffer mode by setting the
ENHBUF bit (SPIxCON1L<0>).
Enable SPIx operation by setting the SPIEN bit
(SPIxCON1L<15>).
Write the data to be transmitted to the
SPIxBUFL and SPIxBUFH registers. Transmission (and reception) will start as soon as data is
written to the SPIxBUFL and SPIxBUFH
registers.
FIGURE 17-2:
3.
4.
5.
6.
7.
8.
Clear the SPIxBUFL and SPIxBUFH registers.
If using interrupts:
a) Clear the interrupt flag bits in the respective
IFSx register.
b) Set the interrupt enable bits in the
respective IECx register.
c) Write the SPIxIP bits in the respective IPCx
register to set the interrupt priority.
Write the desired settings to the SPIxCON1L,
SPIxCON1H and SPIxCON2L registers with the
MSTEN bit (SPIxCON1L<5>) = 0.
Clear the SMP bit.
If the CKE bit is set, then the SSEN bit must be
set, thus enabling the SSx pin.
Clear the SPIROV bit (SPIxSTATL<6>).
Select Enhanced Buffer mode by setting the
ENHBUF bit (SPIxCON1L<0>).
Enable SPIx operation by setting the SPIEN bit
(SPIxCON1L<15>).
SPIx MODULE BLOCK DIAGRAM (ENHANCED MODE)
Internal
Data Bus
Write
Read
SPIxRXB
SPIxTXB
SPIxURDT
MSB
Transmit
Receive
SPIxTXSR
SPIxRXSR
SDIx
MSB
0
Shift
Control
SDOx
SSx/FSYNC
SSx & FSYNC
Control
Clock
Control
1
TXELM<5:0> = 6’b0
URDTEN
Edge
Select
MCLKEN
Baud Rate
Generator
SCKx
Edge
Select
 2015 Microchip Technology Inc.
Clock
Control
MCLK
PBCLK
Enable Master Clock
DS30010089C-page 287
PIC24FJ256GA412/GB412 FAMILY
To set up the SPIx module for Audio mode:
1.
2.
3.
Clear the SPIxBUFL and SPIxBUFH registers.
If using interrupts:
a) Clear the interrupt flag bits in the respective
IFSx register.
b) Set the interrupt enable bits in the
respective IECx register.
a) Write the SPIxIP bits in the respective IPCx
register to set the interrupt priority.
REGISTER 17-1:
R/W-0
6.
SPIxCON1L: SPIx CONTROL REGISTER 1 LOW
U-0
SPIEN
4.
5.
Write the desired settings to the SPIxCON1L,
SPIxCON1H and SPIxCON2L registers with
AUDEN (SPIxCON1H<15>) = 1.
Clear the SPIROV bit (SPIxSTATL<6>).
Enable SPIx operation by setting the SPIEN bit
(SPIxCON1L<15>).
Write the data to be transmitted to the SPIxBUFL
and SPIxBUFH registers. Transmission (and
reception) will start as soon as data is written to
the SPIxBUFL and SPIxBUFH registers.
—
R/W-0
R/W-0
SPISIDL
R/W-0
DISSDO
MODE32
(1,4)
R/W-0
MODE16
(1,4)
R/W-0
R/W-0
SMP
CKE(1)
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
SSEN(2)
CKP
MSTEN
DISSDI
DISSCK
MCLKEN(3)
SPIFE
ENHBUF
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
SPIEN: SPIx On bit
1 = Enables module
0 = Turns off and resets module, disables clocks, disables interrupt event generation, allows SFR
modifications
bit 14
Unimplemented: Read as ‘0’
bit 13
SPISIDL: SPIx Stop in Idle Mode bit
1 = Halts in CPU Idle mode
0 = Continues to operate in CPU Idle mode
bit 12
DISSDO: Disable SDOx Output Port bit
1 = SDOx pin is not used by the module; pin is controlled by port function
0 = SDOx pin is controlled by the module
bit 11-10
MODE32 and MODE16: Serial Word Length Select bits(1,4)
MODE32
Note 1:
2:
3:
4:
MODE16
AUDEN
Communication
32-Bit
1
x
0
1
0
0
8-Bit
1
1
24-Bit Data, 32-Bit FIFO, 32-Bit Channel/64-Bit Frame
1
0
0
1
0
0
0
1
16-Bit
32-Bit Data, 32-Bit FIFO, 32-Bit Channel/64-Bit Frame
16-Bit Data, 16-Bit FIFO, 32-Bit Channel/64-Bit Frame
16-Bit FIFO, 16-Bit Channel/32-Bit Frame
When AUDEN (SPIxCON1H<15>) = 1, this module functions as if CKE = 0, regardless of its actual value.
When FRMEN = 1, SSEN is not used.
MCLKEN can only be written when the SPIEN bit = 0.
This channel is not meaningful for DSP/PCM mode as LRC follows FRMSYPW.
DS30010089C-page 288
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 17-1:
SPIxCON1L: SPIx CONTROL REGISTER 1 LOW (CONTINUED)
bit 9
SMP: SPIx Data Input Sample Phase bit
Master Mode:
1 = Input data is sampled at the end of data output time
0 = Input data is sampled at the middle of data output time
Slave Mode:
Input data is always sampled at the middle of data output time, regardless of the SMP setting.
bit 8
CKE: SPIx Clock Edge Select bit(1)
1 = Transmit happens on transition from active clock state to Idle clock state
0 = Transmit happens on transition from Idle clock state to active clock state
bit 7
SSEN: Slave Select Enable bit (Slave mode)(2)
1 = SSx pin is used by the macro in Slave mode; SSx pin is used as the slave select input
0 = SSx pin is not used by the macro (SSx pin will be controlled by the port I/O)
bit 6
CKP: Clock Polarity Select bit
1 = Idle state for clock is a high level; active state is a low level
0 = Idle state for clock is a low level; active state is a high level
bit 5
MSTEN: Master Mode Enable bit
1 = Master mode
0 = Slave mode
bit 4
DISSDI: Disable SDIx Input Port bit
1 = SDIx pin is not used by the module; pin is controlled by port function
0 = SDIx pin is controlled by the module
bit 3
DISSCK: Disable SCKx Output Port bit
1 = SCKx pin is not used by the module; pin is controlled by port function
0 = SCKx pin is controlled by the module
bit 2
MCLKEN: Master Clock Enable bit(3)
1 = MCLK is used by the BRG
0 = PBCLK is used by the BRG
bit 1
SPIFE: Frame Sync Pulse Edge Select bit
1 = Frame Sync pulse (Idle-to-active edge) coincides with the first bit clock
0 = Frame Sync pulse (Idle-to-active edge) precedes the first bit clock
bit 0
ENHBUF: Enhanced Buffer Enable bit
1 = Enhanced Buffer mode is enabled
0 = Enhanced Buffer mode is disabled
Note 1:
2:
3:
4:
When AUDEN (SPIxCON1H<15>) = 1, this module functions as if CKE = 0, regardless of its actual value.
When FRMEN = 1, SSEN is not used.
MCLKEN can only be written when the SPIEN bit = 0.
This channel is not meaningful for DSP/PCM mode as LRC follows FRMSYPW.
 2015 Microchip Technology Inc.
DS30010089C-page 289
PIC24FJ256GA412/GB412 FAMILY
REGISTER 17-2:
R/W-0
R/W-0
(1)
AUDEN
SPIxCON1H: SPIx CONTROL REGISTER 1 HIGH
SPISGNEXT
R/W-0
IGNROV
R/W-0
IGNTUR
R/W-0
R/W-0
(2)
AUDMONO
URDTEN
R/W-0
(3)
R/W-0
(4)
AUDMOD1
AUDMOD0(4)
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
FRMEN
FRMSYNC
FRMPOL
MSSEN
FRMSYPW
FRMCNT2
FRMCNT1
FRMCNT0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
AUDEN: Audio Codec Support Enable bit(1)
1 = Audio protocol is enabled; MSTEN controls the direction of both SCKx and frame (a.k.a. LRC), and
this module functions as if FRMEN = 1, FRMSYNC = MSTEN, FRMCNT<2:0> = 001 and SMP = 0,
regardless of their actual values
0 = Audio protocol is disabled
bit 14
SPISGNEXT: SPIx Sign-Extend RX FIFO Read Data Enable bit
1 = Data from RX FIFO is sign-extended
0 = Data from RX FIFO is not sign-extended
bit 13
IGNROV: Ignore Receive Overflow bit
1 = A Receive Overflow (ROV) is NOT a critical error; during ROV, data in the FIFO is not overwritten
by the receive data
0 = A ROV is a critical error that stops SPI operation
bit 12
IGNTUR: Ignore Transmit Underrun bit
1 = A Transmit Underrun (TUR) is NOT a critical error and data indicated by URDTEN is transmitted
until the SPIxTXB is not empty
0 = A TUR is a critical error that stops SPI operation
bit 11
AUDMONO: Audio Data Format Transmit bit(2)
1 = Audio data is mono (i.e., each data word is transmitted on both left and right channels)
0 = Audio data is stereo
bit 10
URDTEN: Transmit Underrun Data Enable bit(3)
1 = Transmits data out of SPIxURDT register during Transmit Underrun conditions
0 = Transmits the last received data during Transmit Underrun conditions
bit 9-8
AUDMOD<1:0>: Audio Protocol Mode Selection bits(4)
11 = PCM/DSP mode
10 = Right Justified mode: This module functions as if SPIFE = 1, regardless of its actual value
01 = Left Justified mode: This module functions as if SPIFE = 1, regardless of its actual value
00 = I2S mode: This module functions as if SPIFE = 0, regardless of its actual value
bit 7
FRMEN: Framed SPIx Support bit
1 = Framed SPIx support is enabled (SSx pin is used as the FSYNC input/output)
0 = Framed SPIx support is disabled
Note 1:
2:
3:
4:
AUDEN can only be written when the SPIEN bit = 0.
AUDMONO can only be written when the SPIEN bit = 0 and is only valid for AUDEN = 1.
URDTEN is only valid when IGNTUR = 1.
AUDMOD<1:0> can only be written when the SPIEN bit = 0 and is only valid when AUDEN = 1. When
NOT in PCM/DSP mode, this module functions as if FRMSYPW = 1, regardless of its actual value.
DS30010089C-page 290
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 17-2:
SPIxCON1H: SPIx CONTROL REGISTER 1 HIGH (CONTINUED)
bit 6
FRMSYNC: Frame Sync Pulse Direction Control bit
1 = Frame Sync pulse input (slave)
0 = Frame Sync pulse output (master)
bit 5
FRMPOL: Frame Sync/Slave Select Polarity bit
1 = Frame Sync pulse/slave select is active-high
0 = Frame Sync pulse/slave select is active-low
bit 4
MSSEN: Master Mode Slave Select Enable bit
1 = SPIx slave select support is enabled with polarity determined by FRMPOL (SSx pin is automatically
driven during transmission in Master mode)
0 = Slave select SPIx support is disabled (SSx pin will be controlled by port IO)
bit 3
FRMSYPW: Frame Sync Pulse-Width bit
1 = Frame Sync pulse is one serial word length wide (as defined by MODE<32,16>/WLENGTH<4:0>)
0 = Frame Sync pulse is one clock (SCK) wide
bit 2-0
FRMCNT<2:0>: Frame Sync Pulse Counter bits
Controls the number of serial words transmitted per Sync pulse.
111 = Reserved
110 = Reserved
101 = Generates a Frame Sync pulse on every 32 serial words
100 = Generates a Frame Sync pulse on every 16 serial words
011 = Generates a Frame Sync pulse on every 8 serial words
010 = Generates a Frame Sync pulse on every 4 serial words
001 = Generates a Frame Sync pulse on every 2 serial words (value used by audio protocols)
000 = Generates a Frame Sync pulse on each serial word
Note 1:
2:
3:
4:
AUDEN can only be written when the SPIEN bit = 0.
AUDMONO can only be written when the SPIEN bit = 0 and is only valid for AUDEN = 1.
URDTEN is only valid when IGNTUR = 1.
AUDMOD<1:0> can only be written when the SPIEN bit = 0 and is only valid when AUDEN = 1. When
NOT in PCM/DSP mode, this module functions as if FRMSYPW = 1, regardless of its actual value.
 2015 Microchip Technology Inc.
DS30010089C-page 291
PIC24FJ256GA412/GB412 FAMILY
REGISTER 17-3:
SPIxCON2L: SPIx CONTROL REGISTER 2 LOW
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
U-0
U-0
—
—
U-0
—
R/W-0
R/W-0
R/W-0
R/W-0
WLENGTH<4:0>
R/W-0
(1,2)
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-5
Unimplemented: Read as ‘0’
bit 4-0
WLENGTH<4:0>: Variable Word Length bits(1,2)
11111 = 32-bit data
11110 = 31-bit data
11101 = 30-bit data
11100 = 29-bit data
11011 = 28-bit data
11010 = 27-bit data
11001 = 26-bit data
11000 = 25-bit data
10111 = 24-bit data
10110 = 23-bit data
10101 = 22-bit data
10100 = 21-bit data
10011 = 20-bit data
10010 = 19-bit data
10001 = 18-bit data
10000 = 17-bit data
01111 = 16-bit data
01110 = 15-bit data
01101 = 14-bit data
01100 = 13-bit data
01011 = 12-bit data
01010 = 11-bit data
01001 = 10-bit data
01000 = 9-bit data
00111 = 8-bit data
00110 = 7-bit data
00101 = 6-bit data
00100 = 5-bit data
00011 = 4-bit data
00010 = 3-bit data
00001 = 2-bit data
00000 = See MODE<32,16> bits in SPIxCON1L<11:10>
Note 1:
2:
x = Bit is unknown
These bits are effective when AUDEN = 0 only.
Varying the length by changing these bits does not affect the depth of the TX/RX FIFO.
DS30010089C-page 292
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 17-4:
SPIxSTATL: SPIx STATUS REGISTER LOW
U-0
U-0
U-0
R/C-0, HS
R-0, HSC
U-0
U-0
R-0, HSC
—
—
—
FRMERR
SPIBUSY
—
—
SPITUR(1)
bit 15
bit 8
R-0, HSC
R/C-0, HS
SRMT
SPIROV
R-1, HSC
U-0
R-1, HSC
U-0
R-0, HSC
R-0, HSC
SPIRBE
—
SPITBE
—
SPITBF
SPIRBF
bit 7
bit 0
Legend:
C = Clearable bit
U = Unimplemented, read as ‘0’
R = Readable bit
W = Writable bit
HSC = Hardware Settable/Clearable bit
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
HS = Hardware Settable bit
bit 15-13
Unimplemented: Read as ‘0’
bit 12
FRMERR: SPIx Frame Error Status bit
1 = Frame error is detected
0 = No frame error is detected
bit 11
SPIBUSY: SPIx Activity Status bit
1 = Module is currently busy with some transactions
0 = No ongoing transactions (at time of read)
bit 10-9
Unimplemented: Read as ‘0’
bit 8
SPITUR: SPIx Transmit Underrun Status bit(1)
1 = Transmit buffer has encountered a Transmit Underrun condition
0 = Transmit buffer does not have a Transmit Underrun condition
bit 7
SRMT: Shift Register Empty Status bit
1 = No current or pending transactions (i.e., neither SPIxTXB or SPIxTXSR contains data to transmit)
0 = Current or pending transactions
bit 6
SPIROV: SPIx Receive Overflow Status bit
1 = A new byte/half-word/word has been completely received when the SPIxRXB was full
0 = No overflow
bit 5
SPIRBE: SPIx RX Buffer Empty Status bit
1 = RX buffer is empty
0 = RX buffer is not empty
Standard Buffer Mode:
Automatically set in hardware when SPIxBUF is read from, reading SPIxRXB. Automatically cleared in
hardware when SPIx transfers data from SPIxRXSR to SPIxRXB.
Enhanced Buffer Mode:
Indicates RXELM<5:0> = 000000.
bit 4
Unimplemented: Read as ‘0’
Note 1:
SPITUR is cleared when SPIEN = 0. When IGNTUR = 1, SPITUR provides dynamic status of the
Transmit Underrun condition, but does not stop RX/TX operation and does not need to be cleared by
software.
 2015 Microchip Technology Inc.
DS30010089C-page 293
PIC24FJ256GA412/GB412 FAMILY
REGISTER 17-4:
SPIxSTATL: SPIx STATUS REGISTER LOW (CONTINUED)
bit 3
SPITBE: SPIx Transmit Buffer Empty Status bit
1 = SPIxTXB is empty
0 = SPIxTXB is not empty
Standard Buffer Mode:
Automatically set in hardware when SPIx transfers data from SPIxTXB to SPIxTXSR. Automatically
cleared in hardware when SPIxBUF is written, loading SPIxTXB.
Enhanced Buffer Mode:
Indicates TXELM<5:0> = 000000.
bit 2
Unimplemented: Read as ‘0’
bit 1
SPITBF: SPIx Transmit Buffer Full Status bit
1 = SPIxTXB is full
0 = SPIxTXB not full
Standard Buffer Mode:
Automatically set in hardware when SPIxBUF is written, loading SPIxTXB. Automatically cleared in
hardware when SPIx transfers data from SPIxTXB to SPIxTXSR.
Enhanced Buffer Mode:
Indicates TXELM<5:0> = 111111.
bit 0
SPIRBF: SPIx Receive Buffer Full Status bit
1 = SPIxRXB is full
0 = SPIxRXB is not full
Standard Buffer Mode:
Automatically set in hardware when SPIx transfers data from SPIxRXSR to SPIxRXB. Automatically
cleared in hardware when SPIxBUF is read from, reading SPIxRXB.
Enhanced Buffer Mode:
Indicates RXELM<5:0> = 111111.
Note 1:
SPITUR is cleared when SPIEN = 0. When IGNTUR = 1, SPITUR provides dynamic status of the
Transmit Underrun condition, but does not stop RX/TX operation and does not need to be cleared by
software.
DS30010089C-page 294
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 17-5:
U-0
SPIxSTATH: SPIx STATUS REGISTER HIGH
U-0
—
R-0, HSC
(3)
—
RXELM5
R-0, HSC
(2)
RXELM4
R-0, HSC
(1)
RXELM3
R-0, HSC
R-0, HSC
R-0, HSC
RXELM2
RXELM1
RXELM0
bit 15
bit 8
U-0
U-0
—
—
R-0, HSC
R-0, HSC
R-0, HSC
R-0, HSC
R-0, HSC
R-0, HSC
(3)
(2)
(1)
TXELM2
TXELM1
TXELM0
TXELM5
TXELM4
TXELM3
bit 7
bit 0
Legend:
HSC = Hardware Settable/Clearable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
Unimplemented: Read as ‘0’
bit 13-8
RXELM<5:0>: Receive Buffer Element Count bits (valid in Enhanced Buffer mode)(1,2,3)
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
TXELM<5:0>: Transmit Buffer Element Count bits (valid in Enhanced Buffer mode)(1,2,3)
Note 1:
2:
3:
RXELM3 and TXELM3 bits are only present when FIFODEPTH = 8 or higher.
RXELM4 and TXELM4 bits are only present when FIFODEPTH = 16 or higher.
RXELM5 and TXELM5 bits are only present when FIFODEPTH = 32.
 2015 Microchip Technology Inc.
DS30010089C-page 295
PIC24FJ256GA412/GB412 FAMILY
REGISTER 17-6:
SPIxIMSKL: SPIx INTERRUPT MASK REGISTER LOW
U-0
U-0
U-0
R/W-0
R/W-0
U-0
U-0
R/W-0
—
—
—
FRMERREN
BUSYEN
—
—
SPITUREN
bit 15
bit 8
R/W-0
R/W-0
R/W-0
U-0
R/W-0
U-0
R/W-0
R/W-0
SRMTEN
SPIROVEN
SPIRBEN
—
SPITBEN
—
SPITBFEN
SPIRBFEN
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-13
Unimplemented: Read as ‘0’
bit 12
FRMERREN: Enable Interrupt Events via FRMERR bit
1 = Frame error generates an interrupt event
0 = Frame error does not generate an interrupt event
bit 11
BUSYEN: Enable Interrupt Events via SPIBUSY bit
1 = SPIBUSY generates an interrupt event
0 = SPIBUSY does not generate an interrupt event
bit 10-9
Unimplemented: Read as ‘0’
bit 8
SPITUREN: Enable Interrupt Events via SPITUR bit
1 = Transmit Underrun (TUR) generates an interrupt event
0 = Transmit Underrun does not generate an interrupt event
bit 7
SRMTEN: Enable Interrupt Events via SRMT bit
1 = Shift Register Empty (SRMT) generates interrupt events
0 = Shift Register Empty does not generate interrupt events
bit 6
SPIROVEN: Enable Interrupt Events via SPIROV bit
1 = SPIx Receive Overflow (ROV) generates an interrupt event
0 = SPIx Receive Overflow does not generate an interrupt event
bit 5
SPIRBEN: Enable Interrupt Events via SPIRBE bit
1 = SPIx RX buffer empty generates an interrupt event
0 = SPIx RX buffer empty does not generate an interrupt event
bit 4
Unimplemented: Read as ‘0’
bit 3
SPITBEN: Enable Interrupt Events via SPITBE bit
1 = SPIx transmit buffer empty generates an interrupt event
0 = SPIx transmit buffer empty does not generate an interrupt event
bit 2
Unimplemented: Read as ‘0’
bit 1
SPITBFEN: Enable Interrupt Events via SPITBF bit
1 = SPIx transmit buffer full generates an interrupt event
0 = SPIx transmit buffer full does not generate an interrupt event
bit 0
SPIRBFEN: Enable Interrupt Events via SPIRBF bit
1 = SPIx receive buffer full generates an interrupt event
0 = SPIx receive buffer full does not generate an interrupt event
DS30010089C-page 296
x = Bit is unknown
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 17-7:
SPIxIMSKH: SPIx INTERRUPT MASK REGISTER HIGH
R/W-0
U-0
R/W-0
RXWIEN
—
RXMSK5(1)
R/W-0
R/W-0
R/W-0
RXMSK4(1,4) RXMSK3(1,3) RXMSK2(1,2)
R/W-0
R/W-0
RXMSK1(1)
RXMSK0(1)
bit 15
bit 8
R/W-0
U-0
R/W-0
—
TXWIEN
R/W-0
(1)
TXMSK5
(1,4)
TXMSK4
R/W-0
(1,3)
TXMSK3
R/W-0
TXMSK2
(1,2)
R/W-0
R/W-0
(1)
TXMSK1
TXMSK0(1)
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
RXWIEN: Receive Watermark Interrupt Enable bit
1 = Triggers receive buffer element watermark interrupt when RXMSK<5:0>  RXELM<5:0>
0 = Disables receive buffer element watermark interrupt
bit 14
Unimplemented: Read as ‘0’
bit 13-8
RXMSK<5:0>: RX Buffer Mask bits(1,2,3,4)
RX mask bits; used in conjunction with the RXWIEN bit.
bit 7
TXWIEN: Transmit Watermark Interrupt Enable bit
1 = Triggers transmit buffer element watermark interrupt when TXMSK<5:0> = TXELM<5:0>
0 = Disables transmit buffer element watermark interrupt
bit 6
Unimplemented: Read as ‘0’
bit 5-0
TXMSK<5:0>: TX Buffer Mask bits(1,2,3,4)
TX mask bits; used in conjunction with the TXWIEN bit.
Note 1:
2:
3:
4:
Mask values higher than FIFODEPTH are not valid. The module will not trigger a match for any value in
this case.
RXMSK2 and TXMSK2 bits are only present when FIFODEPTH = 8 or higher.
RXMSK3 and TXMSK3 bits are only present when FIFODEPTH = 16 or higher.
RXMSK4 and TXMSK4 bits are only present when FIFODEPTH = 32.
 2015 Microchip Technology Inc.
DS30010089C-page 297
PIC24FJ256GA412/GB412 FAMILY
FIGURE 17-3:
SPIx MASTER/SLAVE CONNECTION (STANDARD MODE)
Processor 1 (SPIx Master)
Processor 2 (SPIx Slave)
SDOx
SDIx
Serial Receive Buffer
(SPIxRXB)(2)
Shift Register
(SPIxRXSR)
LSb
MSb
Serial Transmit Buffer
(SPIxTXB)(2)
SDIx
SDOx
SDOx
SDIx
Shift Register
(SPIxTXSR)
MSb
Shift Register
(SPIxRXSR)
Shift Register
(SPIxTXSR)
MSb
LSb
MSb
LSb
Serial Transmit Buffer
(SPIxTXB)(2)
SCKx
Serial Clock
SCKx
LSb
Serial Receive Buffer
(SPIxRXB)(2)
SSx(1)
SPIx Buffer
(SPIxBUF)(2)
MSTEN (SPIxCON1L<5>) = 1)
Note 1:
2:
SPIx Buffer
(SPIxBUF)(2)
MSSEN (SPIxCON1H<4>) = 1 and MSTEN (SPIxCON1L<5>) = 0
Using the SSx pin in Slave mode of operation is optional.
User must write transmit data to read the received data from SPIxBUF. The SPIxTXB and SPIxRXB registers
are memory-mapped to SPIxBUF.
DS30010089C-page 298
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
FIGURE 17-4:
SPIx MASTER/SLAVE CONNECTION (ENHANCED BUFFER MODES)
Processor 1 (SPIx Master)
Processor 2 (SPIx Slave)
SDOx
SDIx
Serial Transmit FIFO
(SPIxTXB)(2)
Serial Receive FIFO
(SPIxRXB)(2)
Shift Register
(SPIxRXSR)
LSb
MSb
SDIx
SDOx
SDOx
SDIx
Shift Register
(SPIxTXSR)
MSb
Shift Register
(SPIxRXSR)
Shift Register
(SPIxTXSR)
MSb
LSb
MSb
LSb
Serial Transmit FIFO
(SPIxTXB)(2)
SCKx
Serial Clock
SCKx
LSb
Serial Receive FIFO
(SPIxRXB)(2)
SSx(1)
SPIx Buffer
(SPIxBUF)(2)
SPIx Buffer
(SPIxBUF)(2)
MSTEN (SPIxCON1L<5>) = 1)
Note 1:
2:
FIGURE 17-5:
MSSEN (SPIxCON1H<4>) = 1 and MSTEN (SPIxCON1L<5>) = 0
Using the SSx pin in Slave mode of operation is optional.
User must write transmit data to read the received data from SPIxBUF. The SPIxTXB and SPIxRXB registers
are memory-mapped to SPIxBUF.
SPIx MASTER, FRAME MASTER CONNECTION DIAGRAM
PIC24F
(SPIx Master, Frame Master)
Processor 2
SDOx
SDIx
SDOx
SDIx
SCKx
SSx
 2015 Microchip Technology Inc.
Serial Clock
SCKx
Frame Sync
Pulse
SSx
DS30010089C-page 299
PIC24FJ256GA412/GB412 FAMILY
FIGURE 17-6:
SPIx MASTER, FRAME SLAVE CONNECTION DIAGRAM
PIC24F
SPIx Master, Frame Slave)
Processor 2
SDOx
SDIx
SDOx
SDIx
SCKx
SSx
FIGURE 17-7:
Serial Clock
Frame Sync
Pulse
SCKx
SSx
SPIx SLAVE, FRAME MASTER CONNECTION DIAGRAM
PIC24F
(SPIx Slave, Frame Master)
Processor 2
SDIx
SDOx
SDOx
SDIx
SCKx
SSx
FIGURE 17-8:
Serial Clock
Frame Sync
Pulse
SCKx
SSx
SPIx SLAVE, FRAME SLAVE CONNECTION DIAGRAM
PIC24F
(SPIx Slave, Frame Slave)
Processor 2
SDOx
SDIx
SDOx
SDIx
SCKx
SSx
EQUATION 17-1:
Serial Clock
Frame Sync
Pulse
SCKx
SSx
RELATIONSHIP BETWEEN DEVICE AND SPIx CLOCK SPEED
Baud Rate =
FPB
(2 * (SPIxBRG + 1))
Where:
FPB is the Peripheral Bus Clock Frequency.
DS30010089C-page 300
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
18.0
Note:
INTER-INTEGRATED CIRCUIT
(I2C)
This data sheet summarizes the features of
this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to the
“dsPIC33/PIC24
Family
Reference
Manual”, “Inter-Integrated Circuit (I2C)”
(DS70000195). The information in this data
sheet supersedes the information in the
FRM.
The Inter-Integrated Circuit (I2C) module is a serial
interface useful for communicating with other peripheral or microcontroller devices. These peripheral
devices may be serial EEPROMs, display drivers, A/D
Converters, etc.
18.1
The details of sending a message in Master mode
depends on the communications protocol for the device
being communicated with. Typically, the sequence of
events is as follows:
1.
2.
3.
4.
5.
6.
The I2C module supports these features:
• Independent Master and Slave Logic
• 7-Bit and 10-Bit Device Addresses
• General Call Address as Defined in the
I2C Protocol
• Clock Stretching to Provide Delays for the
Processor to Respond to a Slave Data Request
• Both 100 kHz and 400 kHz Bus Specifications
• Configurable Address Masking
• Multi-Master Modes to Prevent Loss of Messages
in Arbitration
• Bus Repeater mode, Allowing the Acceptance of
All Messages as a Slave, Regardless of the
Address
• Automatic SCL
Communicating as a Master in a
Single Master Environment
7.
8.
9.
10.
11.
12.
13.
Assert a Start condition on SDAx and SCLx.
Send the I 2C device address byte to the slave
with a write indication.
Wait for and verify an Acknowledge from the
slave.
Send the first data byte (sometimes known as
the command) to the slave.
Wait for and verify an Acknowledge from the
slave.
Send the serial memory address low byte to the
slave.
Repeat Steps 4 and 5 until all data bytes are
sent.
Assert a Repeated Start condition on SDAx and
SCLx.
Send the device address byte to the slave with
a read indication.
Wait for and verify an Acknowledge from the
slave.
Enable master reception to receive serial
memory data.
Generate an ACK or NACK condition at the end
of a received byte of data.
Generate a Stop condition on SDAx and SCLx.
A block diagram of the module is shown in Figure 18-1.
 2015 Microchip Technology Inc.
DS30010089C-page 301
PIC24FJ256GA412/GB412 FAMILY
FIGURE 18-1:
I2Cx BLOCK DIAGRAM
Internal
Data Bus
I2CxRCV
Read
SCLx
Shift
Clock
I2CxRSR
LSB
SDAx
Address Match
Match Detect
Write
I2CxMSK
Write
Read
I2CxADD
Read
Start and Stop
Bit Detect
Write
Start and Stop
Bit Generation
Control Logic
I2CxSTAT
Collision
Detect
Read
Write
I2CxCON
Acknowledge
Generation
Read
Clock
Stretching
Write
I2CxTRN
LSB
Read
Shift Clock
Reload
Control
BRG Down Counter
Write
I2CxBRG
Read
TCY/2
DS30010089C-page 302
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
18.2
Setting Baud Rate When
Operating as a Bus Master
18.3
The I2CxMSK register (Register 18-4) designates
address bit positions as “don’t care” for both 7-Bit and
10-Bit Addressing modes. Setting a particular bit
location (= 1) in the I2CxMSK register causes the slave
module to respond, whether the corresponding address
bit value is a ‘0’ or a ‘1’. For example, when I2CxMSK is
set to ‘0010000000’, the slave module will detect both
addresses, ‘0000000000’ and ‘0010000000’.
To compute the Baud Rate Generator reload value, use
Equation 18-1.
EQUATION 18-1:
COMPUTING BAUD RATE
RELOAD VALUE(1,2)
FCY
FSCL = ---------------------------------2   BRG + 2 
or
To enable address masking, the Intelligent Peripheral
Management Interface (IPMI) must be disabled by
clearing the STRICT bit (I2CxCONH<11>).
FCY
BRG =  ------------------- – 2
 2  FSCL
Note:
Note 1: Based on FCY = FOSC/2; Doze mode
and PLL are disabled.
2: These clock rate values are for guidance
only. The actual clock rate can be
affected by various system-level parameters. The actual clock rate should be
measured in its intended application.
TABLE 18-1:
Slave Address Masking
As a result of changes in the I2C protocol,
the addresses in Table 18-2 are reserved
and will not be Acknowledged in Slave
mode. This includes any address mask
settings that include any of these
addresses.
I2Cx CLOCK RATES(1,2)
Required System FSCL
I2CxBRG Value
FCY
(Decimal)
(Hexadecimal)
Actual FSCL
100 kHz
16 MHz
157
9D
100 kHz
100 kHz
8 MHz
78
4E
100 kHz
100 kHz
4 MHz
39
27
99 kHz
400 kHz
16 MHz
37
25
404 kHz
400 kHz
8 MHz
18
12
404 kHz
400 kHz
4 MHz
9
9
385 kHz
400 kHz
2 MHz
4
4
385 kHz
1 MHz
16 MHz
13
D
1.026 MHz
1 MHz
8 MHz
6
6
1.026 MHz
1 MHz
4 MHz
3
3
0.909 MHz
Note 1: Based on FCY = FOSC/2; Doze mode and PLL are disabled.
2: These clock rate values are for guidance only. The actual clock rate can be affected by various
system-level parameters. The actual clock rate should be measured in its intended application.
TABLE 18-2:
Slave Address
I2Cx RESERVED ADDRESSES(1)
R/W Bit
Description
Address(2)
0000 000
0
General Call
0000 000
1
Start Byte
0000 001
x
CBus Address
0000 01x
x
Reserved
0000 1xx
x
HS Mode Master Code
1111 0xx
x
10-Bit Slave Upper Byte(3)
1111 1xx
x
Reserved
Note 1:
2:
3:
The address bits listed here will never cause an address match independent of address mask settings.
This address will be Acknowledged only if GCEN = 1.
A match on this address can only occur on the upper byte in 10-Bit Addressing mode.
 2015 Microchip Technology Inc.
DS30010089C-page 303
PIC24FJ256GA412/GB412 FAMILY
REGISTER 18-1:
R/W-0
I2CxCONL: I2Cx CONTROL REGISTER LOW
U-0
I2CEN
—
R/W-0, HC
I2CSIDL
R/W-1
(1)
SCKREL
R/W-0
R/W-0
R/W-0
R/W-0
STRICT
A10M
DISSLW
SMEN
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0, HC
R/W-0, HC
R/W-0, HC
R/W-0, HC
R/W-0, HC
GCEN
STREN
ACKDT
ACKEN
RCEN
PEN
RSEN
SEN
bit 7
bit 0
Legend:
HC = Hardware Clearable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
I2CEN: I2Cx Enable bit (writable from SW only)
1 = Enables the I2Cx module and configures the SDAx and SCLx pins as serial port pins
0 = Disables the I2Cx module; all I2C pins are controlled by port functions
bit 14
Unimplemented: Read as ‘0’
bit 13
I2CSIDL: I2Cx Stop in Idle Mode bit
1 = Discontinues module operation when device enters Idle mode
0 = Continues module operation in Idle mode
bit 12
SCKREL: SCLx Release Control bit (I2C Slave mode only)(1)
Module resets and (I2CEN = 0) sets SCKREL = 1.
If STREN = 0:(2)
1 = Releases clock
0 = Forces clock low (clock stretch)
If STREN = 1:
1 = Releases clock
0 = Holds clock low (clock stretch); user may program this bit to ‘0’; clock stretch at next SCLx low
bit 11
STRICT: I2Cx Strict Reserved Address Rule Enable bit
1 = Strict reserved addressing is enforced; for reserved addresses, refer to Table 18-2.
(In Slave Mode) – The device doesn’t respond to reserved address space and addresses falling in
that category are NACKed.
(In Master Mode) – The device is allowed to generate addresses with reserved address space.
0 = Reserved addressing would be Acknowledged.
(In Slave Mode) – The device will respond to an address falling in the reserved address space.
When there is a match with any of the reserved addresses, the device will generate an ACK.
(In Master Mode) – Reserved.
bit 10
A10M: 10-Bit Slave Address Flag bit
1 = I2CxADD is a 10-bit slave address
0 = I2CADD is a 7-bit slave address
bit 9
DISSLW: Slew Rate Control Disable bit
1 = Slew rate control is disabled for Standard Speed mode (100 kHz, also disabled for 1 MHz mode)
0 = Slew rate control is enabled for High-Speed mode (400 kHz)
bit 8
SMEN: SMBus Input Levels Enable bit
1 = Enables input logic so thresholds are compliant with the SMBus specification
0 = Disables SMBus-specific inputs
Note 1:
2:
Automatically cleared to ‘0’ at the beginning of slave transmission; automatically cleared to ‘0’ at the end
of slave reception.
Automatically cleared to ‘0’ at the beginning of slave transmission.
DS30010089C-page 304
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 18-1:
I2CxCONL: I2Cx CONTROL REGISTER LOW (CONTINUED)
bit 7
GCEN: General Call Enable bit (I2C Slave mode only)
1 = Enables interrupt when a general call address is received in I2CxRSR; module is enabled for reception
0 = General call address is disabled.
bit 6
STREN: SCLx Clock Stretch Enable bit
In I2C Slave mode only; used in conjunction with the SCKREL bit.
1 = Enables clock stretching
0 = Disables clock stretching
bit 5
ACKDT: Acknowledge Data bit
In I2C Master mode during Master Receive mode. The value that will be transmitted when the user
initiates an Acknowledge sequence at the end of a receive.
In I2C Slave mode when AHEN = 1 or DHEN = 1. The value that the slave will transmit when it initiates
an Acknowledge sequence at the end of an address or data reception.
1 = NACK is sent
0 = ACK is sent
bit 4
ACKEN: Acknowledge Sequence Enable bit
In I2C Master mode only; applicable during Master Receive mode.
1 = Initiates Acknowledge sequence on SDAx and SCLx pins, and transmits ACKDT data bit
0 = Acknowledge sequence is Idle
bit 3
RCEN: Receive Enable bit (I2C Master mode only)
1 = Enables Receive mode for I2C; automatically cleared by hardware at end of 8-bit receive data byte
0 = Receive sequence is not in progress
bit 2
PEN: Stop Condition Enable bit (I2C Master mode only)
1 = Initiates Stop condition on SDAx and SCLx pins
0 = Stop condition is Idle
bit 1
RSEN: Restart Condition Enable bit (I2C Master mode only)
1 = Initiates Restart condition on SDAx and SCLx pins
0 = Restart condition is Idle
bit 0
SEN: Start Condition Enable bit (I2C Master mode only)
1 = Initiates Start condition on SDAx and SCLx pins
0 = Start condition is Idle
Note 1:
2:
Automatically cleared to ‘0’ at the beginning of slave transmission; automatically cleared to ‘0’ at the end
of slave reception.
Automatically cleared to ‘0’ at the beginning of slave transmission.
 2015 Microchip Technology Inc.
DS30010089C-page 305
PIC24FJ256GA412/GB412 FAMILY
REGISTER 18-2:
I2CxCONH: I2Cx CONTROL REGISTER HIGH
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
PCIE
SCIE
BOEN
SDAHT
SBCDE
AHEN
DHEN
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-7
Unimplemented: Read as ‘0’
bit 6
PCIE: Stop Condition Interrupt Enable bit (I2C Slave mode only).
1 = Enables interrupt on detection of Stop condition
0 = Stop detection interrupts are disabled
bit 5
SCIE: Start Condition Interrupt Enable bit (I2C Slave mode only)
1 = Enables interrupt on detection of Start or Restart conditions
0 = Start detection interrupts are disabled
bit 4
BOEN: Buffer Overwrite Enable bit (I2C Slave mode only)
1 = I2CxRCV is updated and an ACK is generated for a received address/data byte, ignoring the state
of the I2COV bit only if RBF bit = 0
0 = I2CxRCV is only updated when I2COV is clear
bit 3
SDAHT: SDAx Hold Time Selection bit
1 = Minimum of 300 ns hold time on SDAx after the falling edge of SCLx
0 = Minimum of 100 ns hold time on SDAx after the falling edge of SCLx
bit 2
SBCDE: Slave Mode Bus Collision Detect Enable bit (I2C Slave mode only)
If, on the rising edge of SCLx, SDAx is sampled low when the module is outputting a high state, the
BCL bit is set and the bus goes Idle. This detection mode is only valid during data and ACK transmit
sequences.
1 = Enables slave bus collision interrupts
0 = Slave bus collision interrupts are disabled
bit 1
AHEN: Address Hold Enable bit (I2C Slave mode only)
1 = Following the 8th falling edge of SCLx for a matching received address byte; SCKREL bit
(I2CxCONH<12>) will be cleared and the SCLx will be held low
0 = Address holding is disabled
bit 0
DHEN: Data Hold Enable bit (I2C Slave mode only)
1 = Following the 8th falling edge of SCLx for a received data byte; slave hardware clears the SCKREL
bit (I2CxCONH<12>) and SCLx is held low
0 = Data holding is disabled
DS30010089C-page 306
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 18-3:
I2CxSTAT: I2Cx STATUS REGISTER
R-0, HSC
R-0, HSC
R-0, HSC
U-0
U-0
R/C-0, HSC
R-0, HSC
R-0, HSC
ACKSTAT
TRSTAT
ACKTIM
—
—
BCL
GCSTAT
ADD10
bit 15
R/C-0, HS
bit 8
R/C-0, HS
IWCOL
I2COV
R-0, HSC
R/C-0, HSC
R/C-0, HSC
R-0, HSC
R-0, HSC
R-0, HSC
D/A
P
S
R/W
RBF
TBF
bit 7
bit 0
Legend:
C = Clearable bit
HSC = Hardware Settable/Clearable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
HS = Hardware Settable bit
bit 15
ACKSTAT: Acknowledge Status bit (updated in all Master and Slave modes)
1 = Acknowledge was not received from slave
0 = Acknowledge was received from slave
bit 14
TRSTAT: Transmit Status bit (when operating as I2C master; applicable to master transmit operation)
1 = Master transmit is in progress (8 bits + ACK)
0 = Master transmit is not in progress
bit 13
ACKTIM: Acknowledge Time Status bit (valid in I2C Slave mode only)
1 = Indicates I2C bus is in an Acknowledge sequence, set on 8th falling edge of SCLx clock
0 = Not an Acknowledge sequence, cleared on 9th rising edge of SCLx clock
bit 12-11
Unimplemented: Read as ‘0’
bit 10
BCL: Bus Collision Detect bit (Master/Slave mode; cleared when I2C module is disabled, I2CEN = 0)
1 = A bus collision has been detected during a master or slave transmit operation
0 = No bus collision has been detected
bit 9
GCSTAT: General Call Status bit (cleared after Stop detection)
1 = General call address was received
0 = General call address was not received
bit 8
ADD10: 10-Bit Address Status bit (cleared after Stop detection)
1 = 10-bit address was matched
0 = 10-bit address was not matched
bit 7
IWCOL: I2Cx Write Collision Detect bit
1 = An attempt to write to the I2CxTRN register failed because the I2C module is busy; must be cleared
in software
0 = No collision
bit 6
I2COV: I2Cx Receive Overflow Flag bit
1 = A byte was received while the I2CxRCV register is still holding the previous byte; I2COV is a “don’t
care” in Transmit mode, must be cleared in software
0 = No overflow
bit 5
D/A: Data/Address bit (when operating as I2C slave)
1 = Indicates that the last byte received was data
0 = Indicates that the last byte received or transmitted was an address
bit 4
P: I2Cx Stop bit
Updated when Start, Reset or Stop is detected; cleared when the I2C module is disabled, I2CEN = 0.
1 = Indicates that a Stop bit has been detected last
0 = Stop bit was not detected last
 2015 Microchip Technology Inc.
DS30010089C-page 307
PIC24FJ256GA412/GB412 FAMILY
REGISTER 18-3:
I2CxSTAT: I2Cx STATUS REGISTER (CONTINUED)
bit 3
S: I2Cx Start bit
Updated when Start, Reset or Stop is detected; cleared when the I2C module is disabled, I2CEN = 0.
1 = Indicates that a Start (or Repeated Start) bit has been detected last
0 = Start bit was not detected last
bit 2
R/W: Read/Write Information bit (when operating as I2C slave)
1 = Read: Indicates the data transfer is output from the slave
0 = Write: Indicates the data transfer is input to the slave
bit 1
RBF: Receive Buffer Full Status bit
1 = Receive is complete, I2CxRCV is full
0 = Receive is not complete, I2CxRCV is empty
bit 0
TBF: Transmit Buffer Full Status bit
1 = Transmit is in progress, I2CxTRN is full (8-bits of data)
0 = Transmit is complete, I2CxTRN is empty
REGISTER 18-4:
I2CxMSK: I2Cx SLAVE MODE ADDRESS MASK REGISTER
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
R/W-0
R/W-0
MSK<9:8>
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
MSK<7:0>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-10
Unimplemented: Read as ‘0’
bit 9-0
MSK<9:0>: I2Cx Mask for Address Bit x Select bits
1 = Enables masking for bit x of the incoming message address; bit match is not required in this position
0 = Disables masking for bit x; bit match is required in this position
DS30010089C-page 308
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
19.0
Note:
UNIVERSAL ASYNCHRONOUS
RECEIVER TRANSMITTER
(UART)
This data sheet summarizes the features of
this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to the
“dsPIC33/PIC24 Family Reference Manual”, “Universal Asynchronous Receiver
Transmitter (UART)” (DS70000582). The
information in this data sheet supersedes
the information in the FRM.
The Universal Asynchronous Receiver Transmitter
(UART) module is one of the serial I/O modules available in the PIC24F device family. The UART is a
full-duplex, asynchronous system that can communicate
with peripheral devices, such as personal computers,
LIN/J2602, RS-232 and RS-485 interfaces. The module
also supports a hardware flow control option with the
UxCTS and UxRTS pins. The UART module includes
IrDA® encoder/decoder unit.
The PIC24FJ256GA412/GB412 family devices are
equipped with six UART modules, referred to as
UART1 through UART6.
The primary features of the UARTx modules are:
• Full-Duplex, 8 or 9-Bit Data Transmission through
the UxTX and UxRX Pins
• Even, Odd or No Parity Options (for 8-bit data)
• One or Two Stop bits
• Hardware Flow Control Option with the UxCTS
and UxRTS Pins
• Fully Integrated Baud Rate Generator with 16-Bit
Prescaler
 2015 Microchip Technology Inc.
• Baud Rates Range from up to 2.5 Mbps and Down to
38 Hz at 40 MIPS in 16x Mode
• Baud Rates Range from up to 10 Mbps and Down to
152 Hz at 40 MIPS in 4x Mode
• 4-Deep, First-In-First-Out (FIFO) Transmit Data
Buffer
• 4-Deep FIFO Receive Data Buffer
• Parity, Framing and Buffer Overrun Error Detection
• Support for 9-Bit Mode with Address Detect
(9th bit = 1)
• Separate Transmit and Receive Interrupts
• Loopback Mode for Diagnostic Support
• Polarity Control for Transmit and Receive Lines
• Support for Sync and Break Characters
• Supports Automatic Baud Rate Detection
• IrDA® Encoder and Decoder Logic
• Includes DMA Support
• 16x Baud Clock Output for IrDA Support
A simplified block diagram of the UARTx module is
shown in Figure 19-1. The UARTx module consists of
these key important hardware elements:
• Baud Rate Generator
• Asynchronous Transmitter
• Asynchronous Receiver
Note:
Throughout this section, references to
register and bit names that may be associated with a specific UART module are
referred to generically by the use of ‘x’ in
place of the specific module number.
Thus, “UxSTAL” might refer to the Status
Low register for either UART1, UART2,
UART3 or UART4.
DS30010089C-page 309
PIC24FJ256GA412/GB412 FAMILY
FIGURE 19-1:
UARTx SIMPLIFIED BLOCK DIAGRAM
Baud Rate Generator
IrDA®
Hardware Flow Control
UxRTS/UxBCLK(1)
(1)
UxCTS
UARTx Receiver
UARTx Transmitter
Note 1:
UxRX (1)
UxTX (1)
For UARTs that use Peripheral Pin Select (PPS), their inputs and outputs must all be assigned to available
RPn/RPIn pins before use. See Section 11.4 “Peripheral Pin Select (PPS)” for more information.
DS30010089C-page 310
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
19.1
UARTx Baud Rate Generator (BRG)
The UARTx module includes a dedicated, 16-bit Baud
Rate Generator. The UxBRG register controls the
period of a free-running, 16-bit timer. Equation 19-1
shows the formula for computation of the baud rate
when BRGH = 0.
EQUATION 19-1:
The maximum baud rate (BRGH = 0) possible is
FCY/16 (for UxBRG = 0) and the minimum baud rate
possible is FCY/(16 * 65536).
Equation 19-2 shows the formula for computation of
the baud rate when BRGH = 1.
EQUATION 19-2:
UARTx BAUD RATE WITH
BRGH = 0(1,2)
Baud Rate =
FCY
Baud Rate =
16 • (UxBRG + 1)
UxBRG =
Note 1:
2:
FCY
16 • Baud Rate
Example 19-1 shows the calculation of the baud rate
error for the following conditions:
• FCY = 4 MHz
• Desired Baud Rate = 9600
EXAMPLE 19-1:
UxBRG =
–1
FCY denotes the instruction cycle
clock frequency (FOSC/2).
Based on FCY = FOSC/2; Doze mode
and PLL are disabled.
UARTx BAUD RATE WITH
BRGH = 1(1,2)
Note 1:
2:
FCY
4 • (UxBRG + 1)
FCY
4 • Baud Rate
–1
FCY denotes the instruction cycle
clock frequency.
Based on FCY = FOSC/2; Doze mode
and PLL are disabled.
The maximum baud rate (BRGH = 1) possible is FCY/4
(for UxBRG = 0) and the minimum baud rate possible
is FCY/(4 * 65536).
Writing a new value to the UxBRG register causes the
BRG timer to be reset (cleared). This ensures the BRG
does not wait for a timer overflow before generating the
new baud rate.
BAUD RATE ERROR CALCULATION (BRGH = 0)(1)
Desired Baud Rate
= FCY/(16 (UxBRG + 1))
Solving for UxBRG Value:
UxBRG
UxBRG
UxBRG
= ((FCY/Desired Baud Rate)/16) – 1
= ((4000000/9600)/16) – 1
= 25
Calculated Baud Rate = 4000000/(16 (25 + 1))
= 9615
Error
Note 1:
= (Calculated Baud Rate – Desired Baud Rate)
Desired Baud Rate
= (9615 – 9600)/9600
= 0.16%
Based on FCY = FOSC/2; Doze mode and PLL are disabled.
 2015 Microchip Technology Inc.
DS30010089C-page 311
PIC24FJ256GA412/GB412 FAMILY
19.2
1.
2.
3.
4.
5.
6.
Set up the UARTx:
a) Write appropriate values for data, parity and
Stop bits.
b) Write appropriate baud rate value to the
UxBRG register.
c) Set up transmit and receive interrupt enable
and priority bits.
Enable the UARTx.
Set the UTXEN bit (causes a transmit interrupt,
two cycles after being set).
Write a data byte to the lower byte of the
UxTXREG word. The value will be immediately
transferred to the Transmit Shift Register (TSR)
and the serial bit stream will start shifting out
with the next rising edge of the baud clock.
Alternatively, the data byte may be transferred
while UTXEN = 0 and then the user may set
UTXEN. This will cause the serial bit stream to
begin immediately because the baud clock will
start from a cleared state.
A transmit interrupt will be generated as per
interrupt control bits, UTXISEL<1:0>.
19.3
1.
2.
3.
4.
5.
6.
Transmitting in 8-Bit Data Mode
Transmitting in 9-Bit Data Mode
Set up the UARTx (as described in Section 19.2
“Transmitting in 8-Bit Data Mode”).
Enable the UARTx.
Set the UTXEN bit (causes a transmit interrupt).
Write UxTXREG as a 16-bit value only.
A word write to UxTXREG triggers the transfer
of the 9-bit data to the TSR. The serial bit stream
will start shifting out with the first rising edge of
the baud clock.
A transmit interrupt will be generated as per the
setting of control bits, UTXISELx.
19.4
Break and Sync Transmit
Sequence
The following sequence will send a message frame
header, made up of a Break, followed by an auto-baud
Sync byte.
1.
2.
3.
4.
5.
Configure the UARTx for the desired mode.
Set UTXEN and UTXBRK to set up the Break
character.
Load the UxTXREG with a dummy character to
initiate transmission (value is ignored).
Write 55h to UxTXREG; this loads the Sync
character into the transmit FIFO.
After the Break has been sent, the UTXBRK bit
is reset by hardware. The Sync character now
transmits.
DS30010089C-page 312
19.5
1.
2.
3.
4.
5.
6.
Receiving in 8-Bit or 9-Bit Data
Mode
Set up the UARTx (as described in Section 19.2
“Transmitting in 8-Bit Data Mode”).
Enable the UARTx.
Set the URXEN bit (UxSTAL<12>).
A receive interrupt will be generated when one
or more data characters have been received as
per interrupt control bits, URXISEL<1:0>.
Read the OERR bit to determine if an overrun
error has occurred. The OERR bit must be reset
in software.
Read UxRXREG.
The act of reading the UxRXREG character will move
the next character to the top of the receive FIFO,
including a new set of PERR and FERR values.
19.6
Operation of UxCTS and UxRTS
Control Pins
UARTx Clear-to-Send (UxCTS) and Request-to-Send
(UxRTS) are the two hardware controlled pins that are
associated with the UARTx modules. These two pins
allow the UARTx to operate in Simplex and Flow
Control mode. They are implemented to control the
transmission and reception between the Data Terminal
Equipment (DTE). The UEN<1:0> bits in the UxMODE
register configure these pins.
19.7
Infrared Support
The UARTx module provides two types of infrared
UART support: one is the IrDA clock output to support
an external IrDA encoder and decoder device (legacy
module support), and the other is the full implementation of the IrDA encoder and decoder. Note that
because the IrDA modes require a 16x baud clock, they
will only work when the BRGH bit (UxMODE<3>) is ‘0’.
19.7.1
IrDA CLOCK OUTPUT FOR
EXTERNAL IrDA SUPPORT
To support external IrDA encoder and decoder devices,
the UxBCLK pin (same as the UxRTS pin) can be
configured to generate the 16x baud clock. With
UEN<1:0> = 11, the UxBCLK pin will output the
16x baud clock if the UARTx module is enabled. It can
be used to support the IrDA codec chip.
19.7.2
BUILT-IN IrDA ENCODER AND
DECODER
The UARTx has full implementation of the IrDA
encoder and decoder as part of the UARTx module.
The built-in IrDA encoder and decoder functionality is
enabled using the IREN bit (UxMODE<12>). When
enabled (IREN = 1), the receive pin (UxRX) acts as the
input from the infrared receiver. The transmit pin
(UxTX) acts as the output to the infrared transmitter.
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 19-1:
UxMODE: UARTx MODE REGISTER
R/W-0
U-0
R/W-0
R/W-0
R/W-0
U-0
R/W-0
R/W-0
UARTEN(1)
—
USIDL
IREN(2)
RTSMD
—
UEN1
UEN0
bit 15
bit 8
R/W-0, HC
R/W-0
R/W-0, HC
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
WAKE
LPBACK
ABAUD
URXINV
BRGH
PDSEL1
PDSEL0
STSEL
bit 7
bit 0
Legend:
HC = Hardware Clearable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
UARTEN: UARTx Enable bit(1)
1 = UARTx is enabled; all UARTx pins are controlled by UARTx as defined by UEN<1:0>
0 = UARTx is disabled; all UARTx pins are controlled by port latches; UARTx power consumption is minimal
bit 14
Unimplemented: Read as ‘0’
bit 13
USIDL: UARTx Stop in Idle Mode bit
1 = Discontinues module operation when device enters Idle mode
0 = Continues module operation in Idle mode
bit 12
IREN: IrDA® Encoder and Decoder Enable bit(2)
1 = IrDA encoder and decoder are enabled
0 = IrDA encoder and decoder are disabled
bit 11
RTSMD: Mode Selection for UxRTS Pin bit
1 = UxRTS pin is in Simplex mode
0 = UxRTS pin is in Flow Control mode
bit 10
Unimplemented: Read as ‘0’
bit 9-8
UEN<1:0>: UARTx Enable bits
11 = UxTX, UxRX and UxBCLK pins are enabled and used; UxCTS pin is controlled by port latches
10 = UxTX, UxRX, UxCTS and UxRTS pins are enabled and used
01 = UxTX, UxRX and UxRTS pins are enabled and used; UxCTS pin is controlled by port latches
00 = UxTX and UxRX pins are enabled and used; UxCTS and UxRTS/UxBCLK pins are controlled by port
latches
bit 7
WAKE: Wake-up on Start Bit Detect During Sleep Mode Enable bit
1 = UARTx continues to sample the UxRX pin; interrupt is generated on the falling edge, bit is cleared
in hardware on the following rising edge
0 = No wake-up is enabled
bit 6
LPBACK: UARTx Loopback Mode Select bit
1 = Enables Loopback mode
0 = Loopback mode is disabled
bit 5
ABAUD: Auto-Baud Enable bit
1 = Enables baud rate measurement on the next character – requires reception of a Sync field (55h);
cleared in hardware upon completion
0 = Baud rate measurement is disabled or completed
bit 4
URXINV: UARTx Receive Polarity Inversion bit
1 = UxRX Idle state is ‘0’
0 = UxRX Idle state is ‘1’
Note 1:
2:
If UARTEN = 1, the peripheral inputs and outputs must be configured to an available RPn/RPIn pin. For
more information, see Section 11.4 “Peripheral Pin Select (PPS)”.
This feature is only available for the 16x BRG mode (BRGH = 0).
 2015 Microchip Technology Inc.
DS30010089C-page 313
PIC24FJ256GA412/GB412 FAMILY
REGISTER 19-1:
UxMODE: UARTx MODE REGISTER (CONTINUED)
bit 3
BRGH: High Baud Rate Enable bit
1 = High-Speed mode (4 BRG clock cycles per bit)
0 = Standard Speed mode (16 BRG clock cycles per bit)
bit 2-1
PDSEL<1:0>: Parity and Data Selection bits
11 = 9-bit data, no parity
10 = 8-bit data, odd parity
01 = 8-bit data, even parity
00 = 8-bit data, no parity
bit 0
STSEL: Stop Bit Selection bit
1 = Two Stop bits
0 = One Stop bit
Note 1:
2:
If UARTEN = 1, the peripheral inputs and outputs must be configured to an available RPn/RPIn pin. For
more information, see Section 11.4 “Peripheral Pin Select (PPS)”.
This feature is only available for the 16x BRG mode (BRGH = 0).
DS30010089C-page 314
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 19-2:
UxSTAL: UARTx STATUS LOW AND CONTROL REGISTER
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0, HC
R/W-0
R-0, HSC
R-1, HSC
UTXISEL1
UTXINV(1)
UTXISEL0
URXEN
UTXBRK
UTXEN(2)
UTXBF
TRMT
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R-1, HSC
R-0, HSC
R-0, HSC
R/C-0, HS
R-0, HSC
URXISEL1
URXISEL0
ADDEN
RIDLE
PERR
FERR
OERR
URXDA
bit 7
bit 0
Legend:
C = Clearable bit
HSC = Hardware Settable/Clearable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
HS = Hardware Settable bit
HC = Hardware Clearable bit
x = Bit is unknown
bit 15,13
UTXISEL<1:0>: UARTx Transmission Interrupt Mode Selection bits
11 = Reserved; do not use
10 = Interrupt when a character is transferred to the Transmit Shift Register (TSR), and as a result, the
transmit buffer becomes empty
01 = Interrupt when the last character is shifted out of the Transmit Shift Register; all transmit
operations are completed
00 = Interrupt when a character is transferred to the Transmit Shift Register (this implies there is at least
one character open in the transmit buffer)
bit 14
UTXINV: UARTx IrDA® Encoder Transmit Polarity Inversion bit(1)
For IREN = 0:
1 = UxTX Idle state is ‘0’
0 = UxTX Idle state is ‘1’
For IREN = 1:
1 = UxTX Idle state is ‘1’
0 = UxTX Idle state is ‘0’
bit 12
URXEN: UARTx Receive Enable bit
1 = Receive is enabled, UxRX pin is controlled by UARTx
0 = Receive is disabled, UxRX pin is controlled by the port
bit 11
UTXBRK: UARTx Transmit Break bit
1 = Sends Sync Break on next transmission – Start bit, followed by twelve ‘0’ bits, followed by Stop bit;
cleared by hardware upon completion
0 = Sync Break transmission is disabled or completed
bit 10
UTXEN: UARTx Transmit Enable bit(2)
1 = Transmit is enabled, UxTX pin is controlled by UARTx
0 = Transmit is disabled, any pending transmission is aborted and the buffer is reset; UxTX pin is
controlled by the port
bit 9
UTXBF: UARTx Transmit Buffer Full Status bit (read-only)
1 = Transmit buffer is full
0 = Transmit buffer is not full, at least one more character can be written
bit 8
TRMT: Transmit Shift Register Empty bit (read-only)
1 = Transmit Shift Register is empty and transmit buffer is empty (the last transmission has completed)
0 = Transmit Shift Register is not empty, a transmission is in progress or queued
Note 1:
2:
The value of this bit only affects the transmit properties of the module when the IrDA encoder is enabled
(IREN = 1).
If UARTEN = 1, the peripheral inputs and outputs must be configured to an available RPn/RPIn pin. For
more information, see Section 11.4 “Peripheral Pin Select (PPS)”.
 2015 Microchip Technology Inc.
DS30010089C-page 315
PIC24FJ256GA412/GB412 FAMILY
REGISTER 19-2:
UxSTAL: UARTx STATUS LOW AND CONTROL REGISTER (CONTINUED)
bit 7-6
URXISEL<1:0>: UARTx Receive Interrupt Mode Selection bits
11 = Interrupt is set on an RSR transfer, making the receive buffer full (i.e., has 4 data characters)
10 = Interrupt is set on an RSR transfer, making the receive buffer 3/4 full (i.e., has 3 data characters)
0x = Interrupt is set when any character is received and transferred from the RSR to the receive buffer;
receive buffer has one or more characters
bit 5
ADDEN: Address Character Detect bit (bit 8 of received data = 1)
1 = Address Detect mode is enabled (if 9-bit mode is not selected, this does not take effect)
0 = Address Detect mode is disabled
bit 4
RIDLE: Receiver Idle bit (read-only)
1 = Receiver is Idle
0 = Receiver is active
bit 3
PERR: Parity Error Status bit (read-only)
1 = Parity error has been detected for the current character (the character at the top of the receive FIFO)
0 = Parity error has not been detected
bit 2
FERR: Framing Error Status bit (read-only)
1 = Framing error has been detected for the current character (the character at the top of the receive FIFO)
0 = Framing error has not been detected
bit 1
OERR: Receive Buffer Overrun Error Status bit (clear/read-only)
1 = Receive buffer has overflowed
0 = Receive buffer has not overflowed (clearing a previously set OERR bit (1  0 transition) will reset
the receive buffer and the RSR to the empty state
bit 0
URXDA: UARTx Receive Buffer Data Available bit (read-only)
1 = Receive buffer has data, at least one more character can be read
0 = Receive buffer is empty
Note 1:
2:
The value of this bit only affects the transmit properties of the module when the IrDA encoder is enabled
(IREN = 1).
If UARTEN = 1, the peripheral inputs and outputs must be configured to an available RPn/RPIn pin. For
more information, see Section 11.4 “Peripheral Pin Select (PPS)”.
REGISTER 19-3:
UxSTAH: UARTx STATUS HIGH AND CONTROL REGISTER
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
ADMASK7
ADMASK6
ADMASK5
ADMASK4
ADMASK3
ADMASK2
ADMASK1
ADMASK0
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
ADMADDR7
ADMADDR6
ADMADDR5
ADMADDR4
ADMADDR3
ADMADDR2
ADMADDR1
ADMADDR0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-8
ADMASK<7:0>: ADMADDR<7:0> Masking bits
1 = Corresponding ADMADDRx bit is used to detect the address match
0 = Corresponding ADMADDRx bit is not used to detect the address match
bit 7-0
ADMADDR<7:0>: Address Detect Task Off-Load bits
Used with the ADMASK<7:0> bits to off-load the task of detecting the address character from the
processor during Address Detect mode.
DS30010089C-page 316
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 19-4:
UxTXREG: UARTx TRANSMIT REGISTER (NORMALLY WRITE-ONLY)
W-x
U-0
U-0
U-0
U-0
U-0
U-0
W-x
LAST(1)
—
—
—
—
—
—
TX8
bit 15
bit 8
W-x
W-x
W-x
W-x
W-x
W-x
W-x
W-x
TX7
TX6
TX5
TX4
TX3
TX2
TX1
TX0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
LAST: Last Byte Indicator for Smart Card Support bit(1)
bit 14-9
Unimplemented: Read as ‘0’
bit 8
TX8: Data of the Transmitted Character bit (in 9-bit mode)
bit 7-0
TX<7:0>: Data of the Transmitted Character bits
Note 1:
x = Bit is unknown
This bit is only available for UART1 and UART2.
 2015 Microchip Technology Inc.
DS30010089C-page 317
PIC24FJ256GA412/GB412 FAMILY
UxSCCON: UARTx SMART CARD CONTROL REGISTER(1)
REGISTER 19-5:
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
TXRPT1(2)
TXRPT0(2)
CONV
T0PD(2)
PTRCL
SCEN
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-6
Unimplemented: Read as ‘0’
bit 5-4
TXRPT<1:0>: Transmit Repeat Selection bits(2)
11 = Retransmits the error byte four times
10 = Retransmits the error byte three times
01 = Retransmits the error byte twice
00 = Retransmits the error byte once
bit 3
CONV: Logic Convention Selection bit
1 = Inverse logic convention
0 = Direct logic convention
bit 2
T0PD: Pull-Down Duration for T = 0 Error Handling bit(2)
1 = 2 ETUs
0 = 1 ETU
bit 1
PTRCL: Smart Card Protocol Selection bit
1 = T = 1 protocol
0 = T = 0 protocol
bit 0
SCEN: Smart Card Mode Enable bit
1 = Smart Card mode is enabled if UARTEN (UxMODE<15>) = 1
0 = Smart Card mode is disabled
Note 1:
2:
x = Bit is unknown
This register is only available for UART1 and UART2.
These bits are applicable to T = 0 only, see the PTRCL bit (UxSCCON<1>).
DS30010089C-page 318
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 19-6:
U-0
UxSCINT: UARTx SMART CARD INTERRUPT REGISTER(1)
U-0
—
R/W-0
—
RXRPTIF
R/W-0
(2)
(2)
TXRPTIF
U-0
U-0
R/W-0
R/W-0
—
—
WTCIF
GTCIF
bit 15
bit 8
U-0
R/W-0
R/W-0
R/W-0
U-0
U-0
R/W-0
R/W-0
—
PARIE(2)
RXRPTIE(2)
TXRPTIE(2)
—
—
WTCIE
GTCIE
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
Unimplemented: Read as ‘0’
bit 13
RXRPTIF: Receive Repeat Interrupt Flag bit(2)
1 = Parity error has persisted after the same character has been received five times (four retransmits)
0 = Flag is cleared
bit 12
TXRPTIF: Transmit Repeat Interrupt Flag bit(2)
1 = Line error has been detected after the last retransmit per TXRPT<1:0>, see Register 19-5
0 = Flag is cleared
bit 11-10
Unimplemented: Read as ‘0’
bit 9
WTCIF: Waiting Time Counter (WTC) Interrupt Flag bit
1 = Waiting Time Counter has reached 0
0 = Waiting Time Counter has not reached 0
bit 8
GTCIF: Guard Time Counter (GTC) Interrupt Flag bit
1 = Guard Time Counter has reached 0
0 = Guard Time Counter has not reached 0
bit 7
Unimplemented: Read as ‘0’
bit 6
PARIE: Parity Interrupt Enable bit(2)
1 = An interrupt is invoked when a character is received with a parity error, see the PERR bit
(UxSTAL<3>) in Register 19-2 for the interrupt flag
0 = Interrupt is disabled
bit 5
RXRPTIE: Receive Repeat Interrupt Enable bit(2)
1 = An interrupt is invoked when a parity error has persisted after the same character has been
received five times (four retransmits)
0 = Interrupt is disabled
bit 4
TXRPTIE: Transmit Repeat Interrupt Enable bit(2)
1 = An interrupt is invoked when a line error is detected after the last retransmit per the TXRPT<1:0>
bits has been completed, see Register 19-5
0 = Interrupt is disabled
bit 3-2
Unimplemented: Read as ‘0’
bit 1
WTCIE: Waiting Time Counter Interrupt Enable bit
1 = Waiting Time Counter interrupt is enabled
0 = Waiting Time Counter interrupt is disabled
bit 0
GTCIE: Guard Time Counter Interrupt Enable bit
1 = Guard Time Counter interrupt is enabled
0 = Guard Time Counter interrupt is disabled
Note 1:
2:
This register is only available for UART1 and UART2.
This bit is applicable to T = 0 only, see the PTRCL bit (UxSCCON<1>).
 2015 Microchip Technology Inc.
DS30010089C-page 319
PIC24FJ256GA412/GB412 FAMILY
UxGTC: UARTx GUARD TIME COUNTER REGISTER(1)
REGISTER 19-7:
U-0
U-0
U-0
U-0
U-0
U-0
U-0
R/W-0
—
—
—
—
—
—
—
GTC8
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
GTC<7:0>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-9
Unimplemented: Read as ‘0’
bit 8-0
GTC<8:0>: Guard Time Counter bits
This counter is operated on the bit clock whose period is always equal to one ETU.
Note 1:
This register is only available for UART1 and UART2.
DS30010089C-page 320
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 19-8:
R/W-0
UxWTCL: UARTx WAITING TIME COUNTER REGISTER (LOWER BITS)(1)
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
WTC<15:8>
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
WTC<7:0>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-0
Note 1:
x = Bit is unknown
WTC<15:0>: Waiting Time Counter bits
This counter is operated on the bit clock whose period is always equal to one ETU.
This register is only available for UART1 and UART2.
REGISTER 19-9:
UxWTCH: WAITING TIME COUNTER REGISTER (UPPER BITS)(1)
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
WTC<23:16>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-8
Unimplemented: Read as ‘0’
bit 7-0
WTC<23:16>: Waiting Time Counter bits
This counter is operated on the bit clock whose period is always equal to one ETU.
Note 1:
This register is only available for UART1 and UART2.
 2015 Microchip Technology Inc.
DS30010089C-page 321
PIC24FJ256GA412/GB412 FAMILY
NOTES:
DS30010089C-page 322
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
20.0
Note:
UNIVERSAL SERIAL BUS WITH
ON-THE-GO SUPPORT
(USB OTG)
This data sheet summarizes the features of
this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to
the “dsPIC33/PIC24 Family Reference
Manual”, “USB On-The-Go (OTG)”
(DS39721). The information in this data
sheet supersedes the information in the
FRM.
PIC24FJ256GB412 family devices contain a full-speed
and low-speed compatible, On-The-Go (OTG) USB
Serial Interface Engine (SIE). The OTG capability
allows the device to act as either a USB peripheral
device or as a USB embedded host with limited host
capabilities. The OTG capability allows the device to
dynamically switch from device to host operation using
OTG’s Host Negotiation Protocol (HNP).
For more details on OTG operation, refer to the
“On-The-Go Supplement” to the “USB 2.0 Specification”, published by the USB-IF. For more details on
USB operation, refer to the “Universal Serial Bus
Specification”, v2.0.
Note:
USB functionality is not available on
PIC24FJ256GA412 family devices.
The USB OTG module offers these features:
• USB Functionality in Device and Host Modes, and
OTG Capabilities for Application-Controlled Mode
Switching
• Software-Selectable Module Speeds of
Full Speed (12 Mbps) or Low Speed
(1.5 Mbps, available in Host mode only)
• Support for All Four USB Transfer Types: Control,
Interrupt, Bulk and Isochronous
• 16 Bidirectional Endpoints for a Total of
32 Unique Endpoints
• DMA Interface for Data RAM Access
• Queues up to Sixteen Unique Endpoint Transfers
without Servicing
• Integrated, On-Chip USB Transceiver with
Support for Off-Chip Transceivers via a
Digital Interface
• Integrated VBUS Generation with On-Chip
Comparators and Boost Generation, and Support
of External VBUS Comparators and Regulators
through a Digital Interface
• Configurations for On-chip Bus Pull-up and
Pull-Down Resistors
 2015 Microchip Technology Inc.
A simplified block diagram of the USB OTG module is
shown in Figure 20-1.
The USB OTG module can function as a USB peripheral
device or as a USB host, and may dynamically switch
between Device and Host modes under software
control. In either mode, the same data paths and Buffer
Descriptors (BDs) are used for the transmission and
reception of data.
In discussing USB operation, this section will use a
controller-centric nomenclature for describing the direction of the data transfer between the microcontroller and
the USB. RX (Receive) will be used to describe transfers
that move data from the USB to the microcontroller and
TX (Transmit) will be used to describe transfers that
move data from the microcontroller to the USB.
Table 20-1 shows the relationship between data
direction in this nomenclature and the USB tokens
exchanged.
TABLE 20-1:
USB Mode
Device
Host
CONTROLLER-CENTRIC
DATA DIRECTION FOR USB
HOST OR TARGET
Direction
RX
TX
OUT or SETUP
IN
IN
OUT or SETUP
This chapter presents the most basic operations
needed to implement USB OTG functionality in an
application. A complete and detailed discussion of the
USB protocol and its OTG supplement are beyond the
scope of this data sheet. It is assumed that the user
already has a basic understanding of USB architecture
and the latest version of the protocol.
Not all steps for proper USB operation (such as device
enumeration) are presented here. It is recommended
that application developers use an appropriate device
driver to implement all of the necessary features.
Microchip provides a number of application-specific
resources, such as USB firmware and driver support.
Refer to www.microchip.com/usb for the latest
firmware and driver support.
DS30010089C-page 323
PIC24FJ256GA412/GB412 FAMILY
FIGURE 20-1:
USB OTG MODULE BLOCK DIAGRAM
Full-Speed Pull-up
Host Pull-Down
48 MHz USB Clock
D+(1)
Registers
and
Control
Interface
Transceiver
VUSB3V3(2)
Transceiver Power 3.3V
D-(1)
Host Pull-Down
USB
SIE
USBID(1)
System
RAM
SRP Charge
VBUS(1)
SRP Discharge
Note 1:
2:
Pins are multiplexed with digital I/O and other device features.
Connecting VBUS3V3 to VDD is highly recommended, as floating this input can cause increased IPD currents. The
pin should be tied to VDD when the USB functions are not used.
DS30010089C-page 324
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
20.1
Hardware Configuration
20.1.1
20.1.1.1
DEVICE MODE
D+ Pull-up Resistor
PIC24FJ256GA412/GB412 family devices have a
built-in 1.5 k resistor on the D+ line that is available
when the microcontroller is operating in Device mode.
This is used to signal an external host that the device is
operating in Full-Speed Device mode. It is engaged by
setting the USBEN bit (U1CON<0>) and powering up
the USB module (USBPWR = 1). If the OTGEN bit
(U1OTGCON<2>) is set, then the D+ pull-up is enabled
through the DPPULUP bit (U1OTGCON<7>).
20.1.1.2
The VBUS Pin
In order to meet the USB 2.0 specification requirement,
relating to the back drive voltage on the D+/D- pins, the
USB module incorporates VBUS-level sensing comparators. When the comparators detect the VBUS level
below the VA_SESS_VLD level, the hardware will automatically disable the D+ pull-up resistor described in
Section 20.1.1.1 “D+ Pull-up Resistor”. This allows
the device to automatically meet the back drive requirement for D+ and D-, even if the application firmware
does not explicitly monitor the VBUS level. Therefore,
the VBUS microcontroller pin should not be left floating
in USB Device mode application designs, and should
normally be connected to the VBUS pin on the USB
connector/cable (either directly or through a small
resistance  100 ohms).
20.1.1.3
To meet compliance specifications, the USB module
(and the D+ or D- pull-up resistor) should not be enabled
until the host actively drives VBUS high. One of the 5.5V
tolerant I/O pins may be used for this purpose.
The application should never source any current onto
the 5V VBUS pin of the USB cable when the USB
module is operated in USB Device mode.
The Dual Power with Self-Power Dominance mode
(Figure 20-4) allows the application to use internal
power primarily, but switch to power from the USB
when no internal power is available. Dual power
devices must also meet all of the special requirements
for inrush current and Suspend mode current previously described, and must not enable the USB module
until VBUS is driven high.
FIGURE 20-2:
BUS POWER ONLY
INTERFACE EXAMPLE
100
3.3V
VBUS
~5V
• Bus Power Only mode
• Self-Power Only mode
• Dual Power with Self-Power Dominance mode
VBUS
VDD
MCP1801
3.3V LDO
VUSB3V3
1 F
VSS
FIGURE 20-3:
SELF-POWER ONLY
Power Modes
Many USB applications will likely have several different
sets of power requirements and configuration. The
most common power modes encountered are:
Attach Sense
100
VBUS
~5V
Attach Sense
VSELF
~3.3V
VBUS
VDD
VUSB3V3
100 k
VSS
Bus Power Only mode (Figure 20-2) is effectively the
simplest method. All power for the application is drawn
from the USB.
To meet the inrush current requirements of the
“USB 2.0 OTG Specification”, the total effective capacitance, appearing across VBUS and ground, must be no
more than 10 F.
In the USB Suspend mode, devices must consume no
more than 2.5 mA from the 5V VBUS line of the USB
cable. During the USB Suspend mode, the D+ or Dpull-up resistor must remain active, which will consume
some of the allowed suspend current.
FIGURE 20-4:
DUAL POWER EXAMPLE
100
VBUS
~5V
VSELF
~3.3V
3.3V
Attach Sense
VBUS
VDD
Low IQ
Regulator
100 k
VUSB3V3
VSS
In Self-Power Only mode (Figure 20-3), the USB
application provides its own power, with very little
power being pulled from the USB. Note that an attach
indication is added to indicate when the USB has been
connected and the host is actively powering VBUS.
 2015 Microchip Technology Inc.
DS30010089C-page 325
PIC24FJ256GA412/GB412 FAMILY
20.1.2
20.1.2.1
HOST AND OTG MODES
20.1.2.2
D+ and D- Pull-Down Resistors
PIC24FJ256GA412/GB412 family devices have a
built-in 15 k pull-down resistor on the D+ and D- lines.
These are used in tandem to signal to the bus that the
microcontroller is operating in Host mode. They are
engaged by setting the HOSTEN bit (U1CON<3>). If
the OTGEN bit (U1OTGCON<2>) is set, then these
pull-downs are enabled by setting the DPPULDWN and
DMPULDWN bits (U1OTGCON<5:4>).
FIGURE 20-5:
Power Configurations
In Host mode, as well as Host mode in On-The-Go
operation, the “USB 2.0 OTG Specification” requires
that the host application should supply power on VBUS.
Since the microcontroller is running below VBUS, and is
not able to source sufficient current, a separate power
supply must be provided.
When the application is always operating in Host mode,
a simple circuit can be used to supply VBUS and
regulate current on the bus (Figure 20-5). For OTG
operation, it is necessary to be able to turn VBUS on or
off as needed, as the microcontroller switches between
Device and Host modes. A typical example using an
external charge pump is shown in Figure 20-6.
HOST INTERFACE EXAMPLE
+5V +3.3V +3.3V
PIC® MCU
VDD
Thermal Fuse
Polymer PTC
2 k
VUSB3V3
0.1 µF
3.3V
150 µF
A/D Pin
2 k
Micro A/B
Connector
VBUS
D+
DID
VSS
VBUS
D+
DID
GND
FIGURE 20-6:
OTG INTERFACE EXAMPLE
VDD
+3.3V +3.3V
MCP1253
1 µF
4.7 µF
Micro A/B
Connector
VBUS
D+
DID
GND
DS30010089C-page 326
GND
C+
VIN
SELECT
CVOUT
SHND
PGOOD
10 µF
0.1 µF
3.3V
PIC® MCU
VDD
VUSB3V3
I/O
I/O
40 k
VBUS
D+
DID
VSS
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
20.1.3
CALCULATING TRANSCEIVER
POWER REQUIREMENTS
The USB transceiver consumes a variable amount of
current depending on the characteristic impedance of
the USB cable, the length of the cable, the VUSB3V3
supply voltage and the actual data patterns moving
across the USB cable. Longer cables have larger
capacitances and consume more total energy when
switching output states. The total transceiver current
consumption will be application-specific.
EQUATION 20-1:
Equation 20-1 can help estimate how much current
actually may be required in full-speed applications.
Refer to the “dsPIC33/PIC24 Family Reference
Manual”, “USB On-The-Go (OTG)” (DS39721) for a
complete discussion on transceiver power consumption.
ESTIMATING USB TRANSCEIVER CURRENT CONSUMPTION
IXCVR =
40 mA • VUSB3V3 • PZERO • PIN • LCABLE
+ IPULLUP
3.3V • 5m
Legend: VUSB3V3 – Voltage applied to the VUSB3V3 pin in volts (3.0V to 3.6V).
PZERO – Percentage (in decimal) of the IN traffic bits sent by the PIC® microcontroller that are a value
of ‘0’.
PIN – Percentage (in decimal) of total bus bandwidth that is used for IN traffic.
LCABLE – Length (in meters) of the USB cable. The “USB 2.0 OTG Specification” requires that
full-speed applications use cables no longer than 5m.
IPULLUP – Current which the nominal, 1.5 k pull-up resistor (when enabled) must supply to the USB
cable.
 2015 Microchip Technology Inc.
DS30010089C-page 327
PIC24FJ256GA412/GB412 FAMILY
20.2
USB Buffer Descriptors and the
BDT
Endpoint buffer control is handled through a structure
called the Buffer Descriptor Table (BDT). This provides
a flexible method for users to construct and control
endpoint buffers of various lengths and configurations.
The BDT can be located in any available 512-byte,
aligned block of data RAM. The BDT Pointer
(U1BDTP1) contains the upper address byte of the
BDT and sets the location of the BDT in RAM. The user
must set this pointer to indicate the table’s location.
The BDT is composed of Buffer Descriptors (BDs)
which are used to define and control the actual buffers
in the USB RAM space. Each BD consists of two 16-bit,
“soft” (non-fixed address) registers, BDnSTAT and
BDnADR, where n represents one of the 64 possible
BDs (range of 0 to 63). BDnSTAT is the status register
for BDn, while BDnADR specifies the starting address
for the buffer associated with BDn.
Note:
Since BDnADR is a 16-bit register, only
the first 64 Kbytes of RAM can be
accessed by the USB module.
FIGURE 20-7:
Depending on the endpoint buffering configuration
used, there are up to 64 sets of Buffer Descriptors, for
a total of 256 bytes. At a minimum, the BDT must be at
least 8 bytes long. This is because the “USB 2.0 OTG
Specification” mandates that every device must have
Endpoint 0 with both input and output for initial setup.
Endpoint mapping in the BDT is dependent on three
variables:
• Endpoint number (0 to 15)
• Endpoint direction (RX or TX)
• Ping-pong settings (U1CNFG1<1:0>)
Figure 20-7 illustrates how these variables are used to
map endpoints in the BDT.
In Host mode, only Endpoint 0 Buffer Descriptors are
used. All transfers utilize the Endpoint 0 Buffer Descriptor and Endpoint Control register (U1EP0). For received
packets, the attached device’s source endpoint is
indicated by the value of ENDPT<3:0> in the USB status
register (U1STAT<7:4>). For transmitted packets, the
attached device’s destination endpoint is indicated by
the value written to the USB Token register (U1TOK).
BDT MAPPING FOR ENDPOINT BUFFERING MODES
PPB<1:0> = 00
No Ping-Pong
Buffers
PPB<1:0> = 01
Ping-Pong Buffer
on EP0 OUT
PPB<1:0> = 10
Ping-Pong Buffers
on All EPs
Total BDT Space:
128 Bytes
Total BDT Space:
132 Bytes
Total BDT Space:
256 Bytes
PPB<1:0> = 11
Ping-Pong Buffers
on All Other EPs
Except EP0
Total BDT Space:
248 Bytes
EP0 RX
Descriptor
EP0 RX Even
Descriptor
EP0 RX Even
Descriptor
EP0 RX
Descriptor
EP0 TX
Descriptor
EP0 RX Odd
Descriptor
EP0 RX Odd
Descriptor
EP0 TX
Descriptor
EP1 RX
Descriptor
EP0 TX
Descriptor
EP0 TX Even
Descriptor
EP1 RX Even
Descriptor
EP1 TX
Descriptor
EP1 RX
Descriptor
EP0 TX Odd
Descriptor
EP1 RX Odd
Descriptor
EP1 TX
Descriptor
EP1 RX Even
Descriptor
EP1 TX Even
Descriptor
EP1 RX Odd
Descriptor
EP1 TX Odd
Descriptor
EP15 TX
Descriptor
EP15 TX
Descriptor
EP1 TX Even
Descriptor
EP1 TX Odd
Descriptor
EP15 TX Odd
Descriptor
Note:
EP15 TX Odd
Descriptor
Memory area is not shown to scale.
DS30010089C-page 328
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
BDs have a fixed relationship to a particular endpoint,
depending on the buffering configuration. Table 20-2
provides the mapping of BDs to endpoints. This relationship also means that gaps may occur in the BDT if
endpoints are not enabled contiguously. This, theoretically, means that the BDs for disabled endpoints could
be used as buffer space. In practice, users should
avoid using such spaces in the BDT unless a method
of validating BD addresses is implemented.
20.2.1
corresponding data buffer during this time. Note that
the microcontroller core can still read BDnSTAT while
the SIE owns the buffer and vice versa.
The Buffer Descriptors have a different meaning based
on the source of the register update. Register 20-1 and
Register 20-2 show the differences in BDnSTAT
depending on its current “ownership”.
When UOWN is set, the user can no longer depend on
the values that were written to the BDs. From this point,
the USB module updates the BDs as necessary, overwriting the original BD values. The BDnSTAT register is
updated by the SIE with the token PID and the transfer
count is updated.
BUFFER OWNERSHIP
Because the buffers and their BDs are shared between
the CPU and the USB module, a simple semaphore
mechanism is used to distinguish which is allowed to
update the BD and associated buffers in memory. This
is done by using the UOWN bit as a semaphore to
distinguish which is allowed to update the BD and
associated buffers in memory. UOWN is the only bit
that is shared between the two configurations of
BDnSTAT.
20.2.2
The USB OTG module uses a dedicated DMA to
access both the BDT and the endpoint data buffers.
Since part of the address space of the DMA is dedicated to the Buffer Descriptors, a portion of the memory
connected to the DMA must comprise a contiguous
address space, properly mapped for the access by the
module.
When UOWN is clear, the BD entry is “owned” by the
microcontroller core. When the UOWN bit is set, the BD
entry and the buffer memory are “owned” by the USB
peripheral. The core should not modify the BD or its
TABLE 20-2:
DMA INTERFACE
ASSIGNMENT OF BUFFER DESCRIPTORS FOR THE DIFFERENT BUFFERING MODES
BDs Assigned to Endpoint
Endpoint
Mode 0
(No Ping-Pong)
Mode 1
(Ping-Pong on EP0 OUT)
Mode 2
(Ping-Pong on All EPs)
Mode 3
(Ping-Pong on All Other
EPs, Except EP0)
Out
In
Out
In
Out
In
Out
In
0
0
1
0 (E), 1 (O)
2
0 (E), 1 (O)
2 (E), 3 (O)
0
1
1
2
3
3
4
4 (E), 5 (O)
6 (E), 7 (O)
2 (E), 3 (O)
4 (E), 5 (O)
2
4
5
5
6
8 (E), 9 (O)
10 (E), 11 (O)
6 (E), 7 (O)
8 (E), 9 (O)
3
6
7
7
8
12 (E), 13 (O)
14 (E), 15 (O)
10 (E), 11 (O) 12 (E), 13 (O)
4
8
9
9
10
16 (E), 17 (O)
18 (E), 19 (O)
14 (E), 15 (O) 16 (E), 17 (O)
5
10
11
11
12
20 (E), 21 (O)
22 (E), 23 (O)
18 (E), 19 (O) 20 (E), 21 (O)
6
12
13
13
14
24 (E), 25 (O)
26 (E), 27 (O)
22 (E), 23 (O) 24 (E), 25 (O)
7
14
15
15
16
28 (E), 29 (O)
30 (E), 31 (O) 26 (E), 27 (O) 28 (E), 29 (O)
8
16
17
17
18
32 (E), 33 (O)
34 (E), 35 (O)
30 (E), 31 (O) 32 (E), 33 (O)
9
18
19
19
20
36 (E), 37 (O)
38 (E), 39 (O)
34 (E), 35 (O) 36 (E), 37 (O)
10
20
21
21
22
40 (E), 41 (O)
42 (E), 43 (O)
38 (E), 39 (O) 40 (E), 41 (O)
11
22
23
23
24
44 (E), 45 (O)
46 (E), 47 (O)
42 (E), 43 (O) 44 (E), 45 (O)
12
24
25
25
26
48 (E), 49 (O)
50 (E), 51 (O)
46 (E), 47 (O) 48 (E), 49 (O)
13
26
27
27
28
52 (E), 53 (O)
54 (E), 55 (O)
50 (E), 51 (O) 52 (E), 53 (O)
14
28
29
29
30
56 (E), 57 (O)
58 (E), 59 (O)
54 (E), 55 (O) 56 (E), 57 (O)
15
30
31
31
32
60 (E), 61 (O)
62 (E), 63 (O)
58 (E), 59 (O) 60 (E), 61 (O)
Legend:
(E) = Even transaction buffer, (O) = Odd transaction buffer
 2015 Microchip Technology Inc.
DS30010089C-page 329
PIC24FJ256GA412/GB412 FAMILY
REGISTER 20-1:
BDnSTAT: BUFFER DESCRIPTOR n STATUS REGISTER PROTOTYPE,
USB MODE (BD0STAT THROUGH BD63STAT)
R/W-x
R/W-x
R/W-x, HSC
R/W-x, HSC
R/W-x, HSC
R/W-x, HSC
R/W-x, HSC
R/W-x, HSC
UOWN
DTS
PID3
PID2
PID1
PID0
BC9
BC8
bit 15
bit 8
R/W-x, HSC
R/W-x, HSC
R/W-x, HSC
R/W-x, HSC
R/W-x, HSC
R/W-x, HSC
R/W-x, HSC
R/W-x, HSC
BC7
BC6
BC5
BC4
BC3
BC2
BC1
BC0
bit 7
bit 0
Legend:
HSC = Hardware Settable/Clearable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
UOWN: USB Own bit
1 = The USB module owns the BD and its corresponding buffer; the CPU must not modify the BD or
the buffer
bit 14
DTS: Data Toggle Packet bit
1 = Data 1 packet
0 = Data 0 packet
bit 13-10
PID<3:0>: Packet Identifier bits (written by the USB module)
In Device Mode:
Represents the PID of the received token during the last transfer.
In Host Mode:
Represents the last returned PID or the transfer status indicator.
bit 9-0
BC<9:0>: Byte Count bits
This represents the number of bytes to be transmitted or the maximum number of bytes to be received
during a transfer. Upon completion, the byte count is updated by the USB module with the actual
number of bytes transmitted or received.
DS30010089C-page 330
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 20-2:
BDnSTAT: BUFFER DESCRIPTOR n STATUS REGISTER PROTOTYPE,
CPU MODE (BD0STAT THROUGH BD63STAT)
R/W-x
R/W-x
r-0
r-0
R/W-x
R/W-x
R/W-x, HSC
R/W-x, HSC
UOWN
(1)
—
—
DTSEN
BSTALL
BC9
BC8
DTS
bit 15
bit 8
R/W-x, HSC
R/W-x, HSC
R/W-x, HSC
R/W-x, HSC
R/W-x, HSC
R/W-x, HSC
R/W-x, HSC
R/W-x, HSC
BC7
BC6
BC5
BC4
BC3
BC2
BC1
BC0
bit 7
bit 0
Legend:
r = Reserved bit
HSC = Hardware Settable/Clearable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
UOWN: USB Own bit
0 = The microcontroller core owns the BD and its corresponding buffer; the USB module ignores all
other fields in the BD
bit 14
DTS: Data Toggle Packet bit(1)
1 = Data 1 packet
0 = Data 0 packet
bit 13-12
Reserved: Maintain as ‘0’
bit 11
DTSEN: Data Toggle Synchronization Enable bit
1 = Data toggle synchronization is enabled; data packets with incorrect Sync value will be ignored
0 = No data toggle synchronization is performed
bit 10
BSTALL: Buffer STALL Enable bit
1 = Buffer STALL is enabled; STALL handshake issued if a token is received that would use the BD in
the given location (UOWN bit remains set, BD value is unchanged); corresponding EPSTALL bit
will get set on any STALL handshake
0 = Buffer STALL is disabled
bit 9-0
BC<9:0>: Byte Count bits
This represents the number of bytes to be transmitted or the maximum number of bytes to be received
during a transfer. Upon completion, the byte count is updated by the USB module with the actual
number of bytes transmitted or received.
Note 1:
This bit is ignored unless DTSEN = 1.
 2015 Microchip Technology Inc.
DS30010089C-page 331
PIC24FJ256GA412/GB412 FAMILY
20.3
USB Interrupts
An interrupt condition in any of these triggers a USB
Error Interrupt Flag (UERRIF) in the top level. Unlike
the device-level interrupt flags in the IFSx registers,
USB interrupt flags in the U1IR registers can only be
cleared by writing a ‘1’ to the bit position.
The USB OTG module has many conditions that can
be configured to cause an interrupt. All interrupt
sources use the same interrupt vector.
Figure 20-8 shows the interrupt logic for the USB
module. There are two layers of interrupt registers in
the USB module. The top level consists of overall USB
status interrupts; these are enabled and flagged in the
U1IE and U1IR registers, respectively. The second
level consists of USB error conditions, which are
enabled and flagged in the U1EIR and U1EIE registers.
FIGURE 20-8:
Interrupts may be used to trap routine events in a USB
transaction. Figure 20-9 provides some common
events within a USB frame and their corresponding
interrupts.
USB OTG INTERRUPT FUNNEL
Top Level (USB Status) Interrupts
STALLIF
STALLIE
ATTACHIF
ATTACHIE
RESUMEIF
RESUMEIE
IDLEIF
IDLEIE
TRNIF
TRNIE
Second Level (USB Error) Interrupts
SOFIF
SOFIE
BTSEF
BTSEE
DMAEF
DMAEE
BTOEF
BTOEE
DFN8EF
DFN8EE
CRC16EF
CRC16EE
CRC5EF (EOFEF)
CRC5EE (EOFEE)
PIDEF
PIDEE
URSTIF (DETACHIF)
URSTIE (DETACHIE)
Set USB1IF
(UERRIF)
UERRIE
IDIF
IDIE
T1MSECIF
TIMSECIE
LSTATEIF
LSTATEIE
ACTVIF
ACTVIE
SESVDIF
SESVDIE
SESENDIF
SESENDIE
VBUSVDIF
VBUSVDIE
Top Level (USB OTG) Interrupts
DS30010089C-page 332
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
20.3.1
CLEARING USB OTG INTERRUPTS
Note:
Unlike device-level interrupts, the USB OTG interrupt
status flags are not freely writable in software. All USB
OTG flag bits are implemented as hardware settable
only bits. Additionally, these bits can only be cleared in
software by writing a ‘1’ to their locations (i.e., performing a MOV type instruction). Writing a ‘0’ to a flag bit
(i.e., a BCLR instruction) has no effect.
FIGURE 20-9:
Throughout this data sheet, a bit that can
only be cleared by writing a ‘1’ to its location is referred to as “Write 1 to Clear”. In
register descriptions, this function is
indicated by the descriptor, “K”.
EXAMPLE OF A USB TRANSACTION AND INTERRUPT EVENTS
From Host From Host To Host
SETUP Token Data
ACK
Set TRNIF
From Host
IN Token
From Host
ACK
Set TRNIF
To Host
ACK
Set TRNIF
USB Reset
URSTIF
Start-of-Frame (SOF)
SOFIF
To Host
Data
From Host From Host
OUT Token Empty Data
Transaction
RESET
SOF
SETUP
DATA
STATUS
Transaction
Complete
SOF
Differential Data
Control Transfer(1)
Note 1:
20.4
The control transfer shown here is only an example showing events that can occur for every transaction. Typical
control transfers will spread across multiple frames.
Device Mode Operation
The following section describes how to perform a common Device mode task. In Device mode, USB transfers
are performed at the transfer level. The USB module
automatically performs the status phase of the transfer.
20.4.1
1.
2.
3.
4.
1 ms Frame
5.
6.
7.
ENABLING DEVICE MODE
Reset the Ping-Pong Buffer Pointers by setting,
then clearing, the Ping-Pong Buffer Reset bit,
PPBRST (U1CON<1>).
Disable all interrupts (U1IE and U1EIE = 00h).
Clear any existing interrupt flags by writing FFh
to U1IR and U1EIR.
Verify that VBUS is present (non-OTG devices
only).
 2015 Microchip Technology Inc.
8.
9.
Enable the USB module by setting the USBEN
bit (U1CON<0>).
Set the OTGEN bit (U1OTGCON<2>) to enable
OTG operation.
Enable the endpoint zero buffer to receive the
first setup packet by setting the EPRXEN and
EPHSHK bits for Endpoint 0 (U1EP0<3,0> = 1).
Power up the USB module by setting the
USBPWR bit (U1PWRC<0>).
Enable the D+ pull-up resistor to signal an attach
by setting the DPPULUP bit (U1OTGCON<7>).
DS30010089C-page 333
PIC24FJ256GA412/GB412 FAMILY
20.4.2
1.
2.
3.
4.
Attach to a USB host and enumerate as described
in Chapter 9 of the “USB 2.0 Specification”.
Create a data buffer and populate it with the data
to send to the host.
In the appropriate (even or odd) TX BD for the
desired endpoint:
a) Set up the status register (BDnSTAT) with
the correct data toggle (DATA0/1) value and
the byte count of the data buffer.
b) Set up the address register (BDnADR) with
the starting address of the data buffer.
c) Set the UOWN bit of the status register to
‘1’.
When the USB module receives an IN token, it
automatically transmits the data in the buffer.
Upon completion, the module updates the status
register (BDnSTAT) and sets the Token
Complete Interrupt Flag, TRNIF (U1IR<3>).
20.4.3
1.
2.
3.
4.
RECEIVING AN IN TOKEN IN
DEVICE MODE
RECEIVING AN OUT TOKEN IN
DEVICE MODE
Attach to a USB host and enumerate as
described in Chapter 9 of the “USB 2.0
Specification”.
Create a data buffer with the amount of data you
are expecting from the host.
In the appropriate (even or odd) TX BD for the
desired endpoint:
a) Set up the status register (BDnSTAT) with
the correct data toggle (DATA0/1) value and
the byte count of the data buffer.
b) Set up the address register (BDnADR) with
the starting address of the data buffer.
c) Set the UOWN bit of the status register to
‘1’.
When the USB module receives an OUT token,
it automatically receives the data sent by the
host to the buffer. Upon completion, the module
updates the status register (BDnSTAT) and sets
the Token Complete Interrupt Flag, TRNIF
(U1IR<3>).
DS30010089C-page 334
20.5
Host Mode Operation
The following sections describe how to perform common
Host mode tasks. In Host mode, USB transfers are
invoked explicitly by the host software. The host
software is responsible for the Acknowledge portion of
the transfer. Also, all transfers are performed using the
USB Endpoint 0 Control register (U1EP0) and Buffer
Descriptors.
20.5.1
ENABLE HOST MODE AND
DISCOVER A CONNECTED DEVICE
1.
Enable Host mode by setting the HOSTEN bit
(U1CON<3>). This causes the Host mode control bits in other USB OTG registers to become
available.
2. Enable the D+ and D- pull-down resistors by
setting the DPPULDWN and DMPULDWN bits
(U1OTGCON<5:4>). Disable the D+ and Dpull-up resistors by clearing the DPPULUP and
DMPULUP bits (U1OTGCON<7:6>).
3. At this point, SOF generation begins with the
SOF counter loaded with 12,000. Eliminate
noise on the USB by clearing the SOFEN bit
(U1CON<0>) to disable Start-of-Frame (SOF)
packet generation.
4. Enable the device attached interrupt by setting
the ATTACHIE bit (U1IE<6>).
5. Wait for the device attached interrupt
(U1IR<6> = 1). This is signaled by the USB
device changing the state of D+ or D- from ‘0’
to ‘1’ (SE0 to J-state). After it occurs, wait
100 ms for the device power to stabilize.
6. Check the state of the JSTATE and SE0 bits in
U1CON. If the JSTATE bit (U1CON<7>) is ‘0’,
the connecting device is low speed. If the connecting device is low speed, set the LSPDEN
and LSPD bits (U1ADDR<7> and U1EP0<7>) to
enable low-speed operation.
7. Reset the USB device by setting the USBRST
bit (U1CON<4>) for at least 50 ms, sending
Reset signaling on the bus. After 50 ms,
terminate the Reset by clearing USBRST.
8. In order to keep the connected device from
going into suspend, enable the SOF packet
generation by setting the SOFEN bit.
9. Wait 10 ms for the device to recover from Reset.
10. Perform enumeration as described by Chapter 9
of the “USB 2.0 Specification”.
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
20.5.2
1.
2.
3.
4.
5.
6.
7.
COMPLETE A CONTROL
TRANSACTION TO A CONNECTED
DEVICE
Follow the procedure described in Section 20.5.1
“Enable Host Mode and Discover a Connected
Device” to discover a device.
Set up the Endpoint Control register for
bidirectional control transfers by writing 0Dh to
U1EP0 (this sets the EPCONDIS, EPTXEN and
EPHSHK bits).
Place a copy of the device framework setup
command in a memory buffer. See Chapter 9 of
the “USB 2.0 Specification” for information on
the device framework command set.
Initialize the Buffer Descriptor (BD) for the current
(even or odd) TX EP0 to transfer the eight bytes of
command data for a device framework command
(i.e., GET DEVICE DESCRIPTOR):
a) Set the BD Data Buffer Address (BD0ADR)
to the starting address of the 8-byte
memory buffer containing the command.
b) Write 8008h to BD0STAT (this sets the
UOWN bit and sets a byte count of 8).
Set the USB device address of the target device
in the address register (U1ADDR<6:0>). After a
USB bus Reset, the device USB address will be
zero. After enumeration, it will be set to another
value between 1 and 127.
Write D0h to U1TOK; this is a SETUP token to
Endpoint 0, the target device’s default control
pipe. This initiates a SETUP token on the bus,
followed by a data packet. The device handshake is returned in the PID field of BD0STAT
after the packets are complete. When the USB
module updates BD0STAT, a Token Complete
Interrupt Flag is asserted (the TRNIF flag is set).
This completes the setup phase of the setup
transaction, as referenced in Chapter 9 of the
“USB 2.0 Specification”.
To initiate the data phase of the setup transaction (i.e., get the data for the GET DEVICE
DESCRIPTOR command), set up a buffer in
memory to store the received data.
8.
Initialize the current (even or odd) RX or TX (RX
for IN, TX for OUT) EP0 BD to transfer the data.
a) Write C040h to BD0STAT. This sets the
UOWN, configures Data Toggle (DTS) to
DATA1 and sets the byte count to the length
of the data buffer (64 or 40h in this case).
b) Set BD0ADR to the starting address of the
data buffer.
9. Write the Token register with the appropriate IN
or OUT token to Endpoint 0, the target device’s
default control pipe (e.g., write 90h to U1TOK for
an IN token for a GET DEVICE DESCRIPTOR
command). This initiates an IN token on the bus,
followed by a data packet from the device to the
host. When the data packet completes, the
BD0STAT is written and a Token Complete Interrupt Flag is asserted (the TRNIF flag is set). For
control transfers with a single packet data
phase, this completes the data phase of the
setup transaction, as referenced in Chapter 9 of
the “USB 2.0 Specification”. If more data needs
to be transferred, return to Step 8.
10. To initiate the status phase of the setup transaction, set up a buffer in memory to receive or send
the zero length status phase data packet.
11. Initialize the current (even or odd) TX EP0 BD to
transfer the status data:
a) Set the BDT buffer address field to the start
address of the data buffer.
b) Write 8000h to BD0STAT (set UOWN bit,
configure DTS to DATA0 and set byte count
to 0).
12. Write the Token register with the appropriate IN
or OUT token to Endpoint 0, the target device’s
default control pipe (e.g., write 01h to U1TOK for
an OUT token for a GET DEVICE DESCRIPTOR
command). This initiates an OUT token on the
bus, followed by a zero length data packet from
the host to the device. When the data packet
completes, the BD is updated with the handshake from the device and a Token Complete
Interrupt Flag is asserted (the TRNIF flag is set).
This completes the status phase of the setup
transaction, as described in Chapter 9 of the
“USB 2.0 Specification”.
Note:
 2015 Microchip Technology Inc.
Only one control transaction can be
performed per frame.
DS30010089C-page 335
PIC24FJ256GA412/GB412 FAMILY
20.5.3
1.
2.
3.
4.
5.
6.
7.
SEND A FULL-SPEED BULK DATA
TRANSFER TO A TARGET DEVICE
Follow the procedure described in Section 20.5.1
“Enable Host Mode and Discover a Connected
Device” and Section 20.5.2 “Complete a Control Transaction to a Connected Device” to
discover and configure a device.
To enable transmit and receive transfers with
handshaking enabled, write 1Dh to U1EP0. If
the target device is a low-speed device, also set
the LSPD (U1EP0<7>) bit. If you want the hardware to automatically retry indefinitely if the
target device asserts a NAK on the transfer,
clear the Retry Disable bit, RETRYDIS
(U1EP0<6>).
Set up the BD for the current (even or odd) TX
EP0 to transfer up to 64 bytes.
Set the USB device address of the target device
in the address register (U1ADDR<6:0>).
Write an OUT token to the desired endpoint to
U1TOK. This triggers the module’s transmit
state machines to begin transmitting the token
and the data.
Wait for the Token Complete Interrupt Flag,
TRNIF. This indicates that the BD has been
released back to the microprocessor and the
transfer has completed. If the Retry Disable bit
(RETRYDIS) is set, the handshake (ACK, NAK,
STALL or ERROR (0Fh)) is returned in the BD
PID field. If a STALL interrupt occurs, the
pending packet must be dequeued and the error
condition in the target device cleared. If a detach
interrupt occurs (SE0 for more than 2.5 µs), then
the target has detached (U1IR<0> is set).
Once the Token Complete Interrupt Flag occurs
(TRNIF is set), the BD can be examined and the
next data packet queued by returning to Step 2.
Note:
USB speed, transceiver and pull-ups
should only be configured during the
module setup phase. It is not recommended to change these settings while
the module is enabled.
20.6
20.6.1
OTG Operation
SESSION REQUEST PROTOCOL
(SRP)
An OTG A-device may decide to power down the VBUS
supply when it is not using the USB link through the
Session Request Protocol (SRP). Software may do this
by configuring a GPIO pin to disable an external power
transistor, or voltage regulator enable signal, which controls the VBUS supply. When the VBUS supply is powered
down, the A-device is said to have ended a USB session.
An OTG A-device or embedded host may repower the
VBUS supply at any time (initiate a new session). An
OTG B-device may also request that the OTG A-device
repower the VBUS supply (initiate a new session). This
is accomplished via Session Request Protocol (SRP).
Prior to requesting a new session, the B-device must first
check that the previous session has definitely ended. To
do this, the B-device must check for two conditions:
1.
2.
VBUS supply is below the session valid voltage.
Both D+ and D- have been low for at least 2 ms.
The B-device will be notified of Condition 1 by the
SESENDIF (U1OTGIR<2>) interrupt. Software will
have to manually check for Condition 2.
Note:
When the A-device powers down the
VBUS supply, the B-device must disconnect its pull-up resistor from power. If the
device is self-powered, it can do this by
clearing DPPULUP (U1OTGCON<7>) and
DMPULUP (U1OTGCON<6>).
The B-device may aid in achieving Condition 1 by discharging the VBUS supply through a resistor. Software
may do this by setting VBUSDIS (U1OTGCON<0>).
After these initial conditions are met, the B-device may
begin requesting the new session. The B-device begins
by pulsing the D+ data line. Software should do this by
setting DPPULUP (U1OTGCON<7>). The data line
should be held high for 5 to 10 ms.
The B-device then proceeds by pulsing the VBUS
supply. Software should do this by setting PUVBUS
(U1CNFG2<4>). When an A-device detects SRP
signaling (either via the ATTACHIF (U1IR<6>) interrupt
or via the SESVDIF (U1OTGIR<3>) interrupt), the
A-device must restore the VBUS supply by properly
configuring the general purpose I/O port pin controlling
the external power source.
The B-device should not monitor the state of the VBUS
supply while performing VBUS supply pulsing. When the
B-device does detect that the VBUS supply has been
restored (via the SESVDIF (U1OTGIR<3>) interrupt),
the B-device must reconnect to the USB link by pulling
up D+ or D- (via the DPPULUP or DMPULUP bit).
The A-device must complete the SRP by driving USB
Reset signaling.
DS30010089C-page 336
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
20.6.2
HOST NEGOTIATION PROTOCOL
(HNP)
In USB OTG applications, a Dual Role Device (DRD) is
a device that is capable of being either a host or a
peripheral. Any OTG DRD must support Host
Negotiation Protocol (HNP).
HNP allows an OTG B-device to temporarily become
the USB host. The A-device must first enable the
B-device to follow HNP. Refer to the “On-The-Go
Supplement” to the “USB 2.0 Specification” for more
information regarding HNP. HNP may only be initiated
at full speed.
After being enabled for HNP by the A-device, the
B-device requests being the host any time that the USB
link is in suspend state, by simply indicating a disconnect. This can be done in software by clearing
DPPULUP and DMPULUP. When the A-device detects
the disconnect condition (via the URSTIF (U1IR<0>)
interrupt), the A-device may allow the B-device to take
over as host. The A-device does this by signaling connect as a full-speed function. Software may accomplish
this by setting DPPULUP.
If the A-device responds instead with resume signaling,
the A-device remains as host. When the B-device
detects the connect condition, via ATTACHIF
(U1IR<6>), the B-device becomes host. The B-device
drives Reset signaling prior to using the bus.
When the B-device has finished in its role as host, it
stops all bus activity and turns on its D+ pull-up resistor
by setting DPPULUP. When the A-device detects a
suspend condition (Idle for 3 ms), the A-device turns off
its D+ pull-up. The A-device may also power down the
VBUS supply to end the session. When the A-device
detects the connect condition (via ATTACHIF), the
A-device resumes host operation and drives Reset
signaling.
 2015 Microchip Technology Inc.
20.7
USB OTG Module Registers
There are a total of 37 memory-mapped registers associated with the USB OTG module. They can be divided
into four general categories:
•
•
•
•
USB OTG Module Control (12)
USB Interrupt (7)
USB Endpoint Management (16)
USB VBUS Power Control (2)
This total does not include the (up to) 128 BD registers
in the BDT. Their prototypes, described in Register 20-1
and Register 20-2, are shown separately in
Section 20.2 “USB Buffer Descriptors and the BDT”.
All USB OTG registers are implemented in the Least
Significant Byte (LSB) of the register. Bits in the upper
byte are unimplemented and have no function. Note
that some registers are instantiated only in Host mode,
while other registers have different bit instantiations
and functions in Device and Host modes.
The registers described in the following sections are
those that have bits with specific control and configuration features. The following registers are used for data
or address values only:
• U1BDTP1: Specifies the 256-word page in data
RAM used for the BDT; 8-bit value with bit 0 fixed
as ‘0’ for boundary alignment.
• U1FRML and U1FRMH: Contain the 11-bit byte
counter for the current data frame.
DS30010089C-page 337
PIC24FJ256GA412/GB412 FAMILY
20.7.1
USB OTG MODULE CONTROL
REGISTERS
REGISTER 20-3:
U1OTGSTAT: USB OTG STATUS REGISTER (HOST MODE ONLY)
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
R-0, HSC
U-0
R-0, HSC
U-0
R-0, HSC
R-0, HSC
U-0
R-0, HSC
ID
—
LSTATE
—
SESVD
SESEND
—
VBUSVD
bit 7
bit 0
Legend:
HSC = Hardware Settable/Clearable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-8
Unimplemented: Read as ‘0’
bit 7
ID: ID Pin State Indicator bit
1 = No plug is attached or a Type B cable has been plugged into the USB receptacle
0 = A Type A plug has been plugged into the USB receptacle
bit 6
Unimplemented: Read as ‘0’
bit 5
LSTATE: Line State Stable Indicator bit
1 = The USB line state (as defined by SE0 and JSTATE) has been stable for the previous 1 ms
0 = The USB line state has not been stable for the previous 1 ms
bit 4
Unimplemented: Read as ‘0’
bit 3
SESVD: Session Valid Indicator bit
1 = The VBUS voltage is above VA_SESS_VLD (as defined in the “USB 2.0 OTG Specification”) on the
A or B-device
0 = The VBUS voltage is below VA_SESS_VLD on the A or B-device
bit 2
SESEND: B Session End Indicator bit
1 = The VBUS voltage is below VB_SESS_END (as defined in the “USB 2.0 OTG Specification”) on the
B-device
0 = The VBUS voltage is above VB_SESS_END on the B-device
bit 1
Unimplemented: Read as ‘0’
bit 0
VBUSVD: A VBUS Valid Indicator bit
1 = The VBUS voltage is above VA_VBUS_VLD (as defined in the “USB 2.0 OTG Specification”) on the
A-device
0 = The VBUS voltage is below VA_VBUS_VLD on the A-device
DS30010089C-page 338
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 20-4:
U1OTGCON: USB ON-THE-GO CONTROL REGISTER
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
R/W-0
R/W-0
DPPULUP
DMPULUP
R/W-0
R/W-0
DPPULDWN(1) DMPULDWN(1)
R/W-0
R/W-0
R/W-0
R/W-0
VBUSON
OTGEN(1)
VBUSCHG
VBUSDIS(1)
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-8
Unimplemented: Read as ‘0’
bit 7
DPPULUP: D+ Pull-up Enable bit
1 = D+ data line pull-up resistor is enabled
0 = D+ data line pull-up resistor is disabled
bit 6
DMPULUP: D- Pull-up Enable bit
1 = D- data line pull-up resistor is enabled
0 = D- data line pull-up resistor is disabled
bit 5
DPPULDWN: D+ Pull-Down Enable bit(1)
1 = D+ data line pull-down resistor is enabled
0 = D+ data line pull-down resistor is disabled
bit 4
DMPULDWN: D- Pull-Down Enable bit(1)
1 = D- data line pull-down resistor is enabled
0 = D- data line pull-down resistor is disabled
bit 3
VBUSON: VBUS Power-on bit
1 = VBUS line is powered
0 = VBUS line is not powered
bit 2
OTGEN: OTG Features Enable bit(1)
1 = USB OTG is enabled; all D+/D- pull-up and pull-down bits are enabled
0 = USB OTG is disabled; D+/D- pull-up and pull-down bits are controlled in hardware by the settings
of the HOSTEN and USBEN (U1CON<3,0>) bits
bit 1
VBUSCHG: VBUS Charge bit
1 = VBUS line is charged through a resistor
0 = VBUS line is not charged
bit 0
VBUSDIS: VBUS Discharge Enable bit(1)
1 = VBUS line is discharged through a resistor
0 = VBUS line is not discharged
Note 1:
These bits are only used in Host mode; do not use in Device mode.
 2015 Microchip Technology Inc.
DS30010089C-page 339
PIC24FJ256GA412/GB412 FAMILY
REGISTER 20-5:
U1PWRC: USB POWER CONTROL REGISTER
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
R-x, HSC
U-0
U-0
R/W-0
U-0
U-0
R/W-0, HC
R/W-0
UACTPND
—
—
USLPGRD
—
—
USUSPND
USBPWR
bit 7
bit 0
Legend:
HC = Hardware Clearable bit
HSC = Hardware Settable/Clearable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-8
Unimplemented: Read as ‘0’
bit 7
UACTPND: USB Activity Pending bit
1 = Module should not be suspended at the moment (requires the USLPGRD bit to be set)
0 = Module may be suspended or powered down
bit 6-5
Unimplemented: Read as ‘0’
bit 4
USLPGRD: USB Sleep/Suspend Guard bit
1 = Indicates to the USB module that it is about to be suspended or powered down
0 = No suspend
bit 3-2
Unimplemented: Read as ‘0’
bit 1
USUSPND: USB Suspend Mode Enable bit
1 = USB OTG module is in Suspend mode; USB clock is gated and the transceiver is placed in a
low-power state
0 = Normal USB OTG operation
bit 0
USBPWR: USB Operation Enable bit
1 = USB OTG module is enabled
0 = USB OTG module is disabled(1)
Note 1:
Do not clear this bit unless the HOSTEN, USBEN and OTGEN bits (U1CON<3,0> and U1OTGCON<2>)
are all cleared.
DS30010089C-page 340
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 20-6:
U1STAT: USB STATUS REGISTER
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
R-0, HSC
R-0, HSC
R-0, HSC
R-0, HSC
R-0, HSC
R-0, HSC
U-0
U-0
ENDPT3
ENDPT2
ENDPT1
ENDPT0
DIR
PPBI(1)
—
—
bit 7
bit 0
Legend:
HSC = Hardware Settable/Clearable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-8
Unimplemented: Read as ‘0’
bit 7-4
ENDPT<3:0>: Number of the Last Endpoint Activity bits
(Represents the number of the BDT updated by the last USB transfer.)
1111 = Endpoint 15
1110 = Endpoint 14
•
•
•
0001 = Endpoint 1
0000 = Endpoint 0
bit 3
DIR: Last BD Direction Indicator bit
1 = The last transaction was a transmit transfer (TX)
0 = The last transaction was a receive transfer (RX)
bit 2
PPBI: Ping-Pong BD Pointer Indicator bit(1)
1 = The last transaction was to the odd BD bank
0 = The last transaction was to the even BD bank
bit 1-0
Unimplemented: Read as ‘0’
Note 1:
x = Bit is unknown
This bit is only valid for endpoints with available even and odd BD registers.
 2015 Microchip Technology Inc.
DS30010089C-page 341
PIC24FJ256GA412/GB412 FAMILY
REGISTER 20-7:
U1CON: USB CONTROL REGISTER (DEVICE MODE)
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
U-0
R-x, HSC
R/W-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
—
SE0
PKTDIS
—
HOSTEN
RESUME
PPBRST
USBEN
bit 7
bit 0
Legend:
HSC = Hardware Settable/Clearable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-7
Unimplemented: Read as ‘0’
bit 6
SE0: Live Single-Ended Zero Flag bit
1 = Single-ended zero is active on the USB bus
0 = No single-ended zero is detected
bit 5
PKTDIS: Packet Transfer Disable bit
1 = SIE token and packet processing are disabled; automatically set when a SETUP token is received
0 = SIE token and packet processing are enabled
bit 4
Unimplemented: Read as ‘0’
bit 3
HOSTEN: Host Mode Enable bit
1 = USB host capability is enabled; pull-downs on D+ and D- are activated in hardware
0 = USB host capability is disabled
bit 2
RESUME: Resume Signaling Enable bit
1 = Resume signaling is activated
0 = Resume signaling is disabled
bit 1
PPBRST: Ping-Pong Buffers Reset bit
1 = Resets all Ping-Pong Buffer Pointers to the even BD banks
0 = Ping-Pong Buffer Pointers are not reset
bit 0
USBEN: USB Module Enable bit
1 = USB module and supporting circuitry are enabled (device attached); D+ pull-up is activated in hardware
0 = USB module and supporting circuitry are disabled (device detached)
DS30010089C-page 342
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 20-8:
U1CON: USB CONTROL REGISTER (HOST MODE ONLY)
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
R-x, HSC
R-x, HSC
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
JSTATE
SE0
TOKBUSY
USBRST
HOSTEN
RESUME
PPBRST
SOFEN
bit 7
bit 0
Legend:
HSC = Hardware Settable/Clearable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-8
Unimplemented: Read as ‘0’
bit 7
JSTATE: Live Differential Receiver J-State Flag bit
1 = J-state (differential ‘0’ in low speed, differential ‘1’ in full speed) is detected on the USB
0 = No J-state is detected
bit 6
SE0: Live Single-Ended Zero Flag bit
1 = Single-ended zero is active on the USB bus
0 = No single-ended zero is detected
bit 5
TOKBUSY: Token Busy Status bit
1 = Token is being executed by the USB module in On-The-Go state
0 = No token is being executed
bit 4
USBRST: USB Module Reset bit
1 = USB Reset has been generated for a software Reset; application must set this bit for 50 ms, then
clear it
0 = USB Reset is terminated
bit 3
HOSTEN: Host Mode Enable bit
1 = USB host capability is enabled; pull-downs on D+ and D- are activated in hardware
0 = USB host capability is disabled
bit 2
RESUME: Resume Signaling Enable bit
1 = Resume signaling is activated; software must set bit for 10 ms and then clear to enable remote
wake-up
0 = Resume signaling is disabled
bit 1
PPBRST: Ping-Pong Buffers Reset bit
1 = Resets all Ping-Pong Buffer Pointers to the even BD banks
0 = Ping-Pong Buffer Pointers are not reset
bit 0
SOFEN: Start-of-Frame Enable bit
1 = Start-of-Frame token is sent every one 1 ms
0 = Start-of-Frame token is disabled
 2015 Microchip Technology Inc.
DS30010089C-page 343
PIC24FJ256GA412/GB412 FAMILY
REGISTER 20-9:
U1ADDR: USB ADDRESS REGISTER
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
R/W-0
LSPDEN
(1)
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
ADDR6
ADDR5
ADDR4
ADDR3
ADDR2
ADDR1
ADDR0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-8
Unimplemented: Read as ‘0’
bit 7
LSPDEN: Low-Speed Enable Indicator bit(1)
1 = USB module operates at low speed
0 = USB module operates at full speed
bit 6-0
ADDR<6:0>: USB Device Address bits
Note 1:
x = Bit is unknown
Host mode only. In Device mode, this bit is unimplemented and read as ‘0’.
REGISTER 20-10: U1TOK: USB TOKEN REGISTER (HOST MODE ONLY)
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
PID3
PID2
PID1
PID0
EP3
EP2
EP1
EP0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-8
Unimplemented: Read as ‘0’
bit 7-4
PID<3:0>: Token Type Identifier bits
1101 = SETUP (TX) token type transaction(1)
1001 = IN (RX) token type transaction(1)
0001 = OUT (TX) token type transaction(1)
bit 3-0
EP<3:0>: Token Command Endpoint Address bits
This value must specify a valid endpoint on the attached device.
Note 1:
x = Bit is unknown
All other combinations are reserved and are not to be used.
DS30010089C-page 344
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 20-11:
U1SOF: USB OTG START-OF-TOKEN THRESHOLD REGISTER (HOST MODE ONLY)
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
CNT<7:0>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-8
Unimplemented: Read as ‘0’
bit 7-0
CNT<7:0>: Start-of-Frame Size bits
Value represents 10 + (packet size of n bytes). For example:
0100 1010 = 64-byte packet
0010 1010 = 32-byte packet
0001 0010 = 8-byte packet
 2015 Microchip Technology Inc.
x = Bit is unknown
DS30010089C-page 345
PIC24FJ256GA412/GB412 FAMILY
REGISTER 20-12: U1CNFG1: USB CONFIGURATION REGISTER 1
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
R/W-0
R/W-0
U-0
R/W-0
U-0
U-0
R/W-0
R/W-0
UTEYE
UOEMON(1)
—
USBSIDL
—
—
PPB1
PPB0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-8
Unimplemented: Read as ‘0’
bit 7
UTEYE: USB Eye Pattern Test Enable bit
1 = Eye pattern test is enabled
0 = Eye pattern test is disabled
bit 6
UOEMON: USB OE Monitor Enable bit(1)
1 = OE signal is active; it indicates intervals during which the D+/D- lines are driving
0 = OE signal is inactive
bit 5
Unimplemented: Read as ‘0’
bit 4
USBSIDL: USB OTG Stop in Idle Mode bit
1 = Discontinues module operation when the device enters Idle mode
0 = Continues module operation in Idle mode
bit 3-2
Unimplemented: Read as ‘0’
bit 1-0
PPB<1:0>: Ping-Pong Buffers Configuration bits
11 = Even/Odd Ping-Pong Buffers are enabled for Endpoints 1 to 15
10 = Even/Odd Ping-Pong Buffers are enabled for all endpoints
01 = Even/Odd Ping-Pong Buffers are enabled for OUT Endpoint 0
00 = Even/Odd Ping-Pong Buffers are disabled
Note 1:
This bit is only active when the UTRDIS bit (U1CNFG2<0>) is set.
DS30010089C-page 346
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 20-13: U1CNFG2: USB CONFIGURATION REGISTER 2
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
U-0
U-0
U-0
R/W-0
U-0
U-0
r-0
r-0
—
—
—
PUVBUS(1)
—
—
—
—
bit 7
bit 0
Legend:
r = Reserved bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-5
Unimplemented: Read as ‘0’
bit 4
PUVBUS: VBUS Pull-Up Enable bit(1)
1 = Pull-up on VBUS pin is enabled
0 = Pull-up on VBUS pin is disabled
bit 3-2
Unimplemented: Read as ‘0’
bit 1-0
Reserved: Maintain as ‘0’
Note 1:
x = Bit is unknown
Never change this bit while the USBPWR bit is set (U1PWRC<0> = 1).
 2015 Microchip Technology Inc.
DS30010089C-page 347
PIC24FJ256GA412/GB412 FAMILY
20.7.2
USB INTERRUPT REGISTERS
REGISTER 20-14: U1OTGIR: USB OTG INTERRUPT STATUS REGISTER (HOST MODE ONLY)
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
R/K-0, HS
R/K-0, HS
R/K-0, HS
R/K-0, HS
R/K-0, HS
R/K-0, HS
U-0
R/K-0, HS
IDIF
T1MSECIF
LSTATEIF
ACTVIF
SESVDIF
SESENDIF
—
VBUSVDIF
bit 7
bit 0
Legend:
HS = Hardware Settable bit
R = Readable bit
K = Write ‘1’ to Clear bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-8
Unimplemented: Read as ‘0’
bit 7
IDIF: ID State Change Indicator bit
1 = Change in ID state is detected
0 = No ID state change is detected
bit 6
T1MSECIF: 1 Millisecond Timer bit
1 = The 1 millisecond timer has expired
0 = The 1 millisecond timer has not expired
bit 5
LSTATEIF: Line State Stable Indicator bit
1 = USB line state (as defined by the SE0 and JSTATE bits) has been stable for 1 ms, but different from
the last time
0 = USB line state has not been stable for 1 ms
bit 4
ACTVIF: Bus Activity Indicator bit
1 = Activity on the D+/D- lines or VBUS is detected
0 = No activity on the D+/D- lines or VBUS is detected
bit 3
SESVDIF: Session Valid Change Indicator bit
1 = VBUS has crossed VA_SESS_END (as defined in the “USB 2.0 OTG Specification”)(1)
0 = VBUS has not crossed VA_SESS_END
bit 2
SESENDIF: B-Device VBUS Change Indicator bit
1 = VBUS change on B-device is detected; VBUS has crossed VB_SESS_END (as defined in the “USB 2.0
OTG Specification”)(1)
0 = VBUS has not crossed VA_SESS_END
bit 1
Unimplemented: Read as ‘0’
bit 0
VBUSVDIF: A-Device VBUS Change Indicator bit
1 = VBUS change on A-device is detected; VBUS has crossed VA_VBUS_VLD (as defined in the “USB 2.0
OTG Specification”)(1)
0 = No VBUS change on A-device is detected
Note 1:
Note:
VBUS threshold crossings may either be rising or falling.
Individual bits can only be cleared by writing a ‘1’ to the bit position as part of a word write operation on the
entire register. Using Boolean instructions or bitwise operations to write to a single bit position will cause
all set bits, at the moment of the write, to become cleared.
DS30010089C-page 348
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 20-15: U1OTGIE: USB OTG INTERRUPT ENABLE REGISTER (HOST MODE ONLY)
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
U-0
R/W-0
IDIE
T1MSECIE
LSTATEIE
ACTVIE
SESVDIE
SESENDIE
—
VBUSVDIE
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-8
Unimplemented: Read as ‘0’
bit 7
IDIE: ID Interrupt Enable bit
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 6
T1MSECIE: 1 Millisecond Timer Interrupt Enable bit
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 5
LSTATEIE: Line State Stable Interrupt Enable bit
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 4
ACTVIE: Bus Activity Interrupt Enable bit
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 3
SESVDIE: Session Valid Interrupt Enable bit
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 2
SESENDIE: B-Device Session End Interrupt Enable bit
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 1
Unimplemented: Read as ‘0’
bit 0
VBUSVDIE: A-Device VBUS Valid Interrupt Enable bit
1 = Interrupt is enabled
0 = Interrupt is disabled
 2015 Microchip Technology Inc.
x = Bit is unknown
DS30010089C-page 349
PIC24FJ256GA412/GB412 FAMILY
REGISTER 20-16: U1IR: USB INTERRUPT STATUS REGISTER (DEVICE MODE ONLY)
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
R/K-0, HS
U-0
R/K-0, HS
R/K-0, HS
R/K-0, HS
R/K-0, HS
R/K-0, HS
R/K-0, HS
STALLIF
—
RESUMEIF
IDLEIF
TRNIF
SOFIF
UERRIF
URSTIF
bit 7
bit 0
Legend:
HS = Hardware Settable bit
R = Readable bit
K = Write ‘1’ to Clear bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-8
Unimplemented: Read as ‘0’
bit 7
STALLIF: STALL Handshake Interrupt bit
1 = A STALL handshake was sent by the peripheral during the handshake phase of the transaction in
Device mode
0 = A STALL handshake has not been sent
bit 6
Unimplemented: Read as ‘0’
bit 5
RESUMEIF: Resume Interrupt bit
1 = A K-state is observed on the D+ or D- pin for 2.5 s (differential ‘1’ for low speed, differential ‘0’ for
full speed)
0 = No K-state is observed
bit 4
IDLEIF: Idle Detect Interrupt bit
1 = Idle condition is detected (constant Idle state of 3 ms or more)
0 = No Idle condition is detected
bit 3
TRNIF: Token Processing Complete Interrupt bit
1 = Processing of the current token is complete; read the U1STAT register for endpoint information
0 = Processing of the current token is not complete; clear the U1STAT register or load the next token
from STAT (clearing this bit causes the STAT FIFO to advance)
bit 2
SOFIF: Start-of-Frame Token Interrupt bit
1 = A Start-of-Frame token is received by the peripheral or the Start-of-Frame threshold is reached by
the host
0 = No Start-of-Frame token is received or threshold reached
bit 1
UERRIF: USB Error Condition Interrupt bit
1 = An unmasked error condition has occurred; only error states enabled in the U1EIE register can set
this bit
0 = No unmasked error condition has occurred
bit 0
URSTIF: USB Reset Interrupt bit
1 = Valid USB Reset has occurred for at least 2.5 s; Reset state must be cleared before this bit can
be reasserted
0 = No USB Reset has occurred; individual bits can only be cleared by writing a ‘1’ to the bit position
as part of a word write operation on the entire register. Using Boolean instructions or bitwise operations to write to a single bit position will cause all set bits, at the moment of the write, to become
cleared
Note:
Individual bits can only be cleared by writing a ‘1’ to the bit position as part of a word write operation on the
entire register. Using Boolean instructions or bitwise operations to write to a single bit position will cause
all set bits, at the moment of the write, to become cleared.
DS30010089C-page 350
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 20-17: U1IR: USB INTERRUPT STATUS REGISTER (HOST MODE ONLY)
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
R/K-0, HS
R/K-0, HS
R/K-0, HS
R/K-0, HS
R/K-0, HS
R/K-0, HS
R/K-0, HS
R/K-0, HS
STALLIF
ATTACHIF
RESUMEIF
IDLEIF
TRNIF
SOFIF
UERRIF
DETACHIF
bit 7
bit 0
Legend:
HS = Hardware Settable bit
R = Readable bit
K = Write ‘1’ to Clear bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-8
Unimplemented: Read as ‘0’
bit 7
STALLIF: STALL Handshake Interrupt bit
1 = A STALL handshake was sent by the peripheral device during the handshake phase of the
transaction in Device mode
0 = A STALL handshake has not been sent
bit 6
ATTACHIF: Peripheral Attach Interrupt bit
1 = A peripheral attachment has been detected by the module; it is set if the bus state is not SE0 and
there has been no bus activity for 2.5 s
0 = No peripheral attachment has been detected
bit 5
RESUMEIF: Resume Interrupt bit
1 = A K-state is observed on the D+ or D- pin for 2.5 s (differential ‘1’ for low speed, differential ‘0’ for
full speed)
0 = No K-state is observed
bit 4
IDLEIF: Idle Detect Interrupt bit
1 = Idle condition is detected (constant Idle state of 3 ms or more)
0 = No Idle condition is detected
bit 3
TRNIF: Token Processing Complete Interrupt bit
1 = Processing of the current token is complete; read the U1STAT register for endpoint information
0 = Processing of the current token is not complete; clear the U1STAT register or load the next token
from U1STAT
bit 2
SOFIF: Start-of-Frame Token Interrupt bit
1 = A Start-of-Frame token is received by the peripheral or the Start-of-Frame threshold is reached by the host
0 = No Start-of-Frame token is received or threshold reached
bit 1
UERRIF: USB Error Condition Interrupt bit
1 = An unmasked error condition has occurred; only error states enabled in the U1EIE register can set this bit
0 = No unmasked error condition has occurred
bit 0
DETACHIF: Detach Interrupt bit
1 = A peripheral detachment has been detected by the module; Reset state must be cleared before this
bit can be reasserted
0 = No peripheral detachment is detected. Individual bits can only be cleared by writing a ‘1’ to the bit
position as part of a word write operation on the entire register. Using Boolean instructions or bitwise
operations to write to a single bit position will cause all set bits, at the moment of the write, to become
cleared.
Note:
Individual bits can only be cleared by writing a ‘1’ to the bit position as part of a word write operation on the
entire register. Using Boolean instructions or bitwise operations to write to a single bit position will cause
all set bits, at the moment of the write, to become cleared.
 2015 Microchip Technology Inc.
DS30010089C-page 351
PIC24FJ256GA412/GB412 FAMILY
REGISTER 20-18: U1IE: USB INTERRUPT ENABLE REGISTER (ALL USB MODES)
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
STALLIE
ATTACHIE(1)
RESUMEIE
IDLEIE
TRNIE
SOFIE
UERRIE
URSTIE
DETACHIE
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-8
Unimplemented: Read as ‘0’
bit 7
STALLIE: STALL Handshake Interrupt Enable bit
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 6
ATTACHIE: Peripheral Attach Interrupt bit (Host mode only)(1)
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 5
RESUMEIE: Resume Interrupt bit
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 4
IDLEIE: Idle Detect Interrupt bit
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 3
TRNIE: Token Processing Complete Interrupt bit
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 2
SOFIE: Start-of-Frame Token Interrupt bit
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 1
UERRIE: USB Error Condition Interrupt bit
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 0
For Device Mode:
URSTIE: USB Reset Interrupt Enable bit
For Host Mode:
DETACHIE: USB Detach Interrupt Enable bit
1 = Interrupt is enabled
0 = Interrupt is disabled
Note 1:
x = Bit is unknown
This bit is unimplemented in Device mode, read as ‘0’.
DS30010089C-page 352
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 20-19: U1EIR: USB ERROR INTERRUPT STATUS REGISTER
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
R/K-0, HS
U-0
R/K-0, HS
R/K-0, HS
R/K-0, HS
R/K-0, HS
R/K-0, HS
R/K-0, HS
BTSEF
—
DMAEF
BTOEF
DFN8EF
CRC16EF
CRC5EF
PIDEF
EOFEF
bit 7
bit 0
Legend:
HS = Hardware Settable bit
R = Readable bit
K = Write ‘1’ to Clear bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-8
Unimplemented: Read as ‘0’
bit 7
BTSEF: Bit Stuff Error Flag bit
1 = Bit stuff error has been detected
0 = No bit stuff error has been detected
bit 6
Unimplemented: Read as ‘0’
bit 5
DMAEF: DMA Error Flag bit
1 = A USB DMA error condition is detected; the data size indicated by the BD byte count field is less
than the number of received bytes, the received data is truncated
0 = No DMA error
bit 4
BTOEF: Bus Turnaround Time-out Error Flag bit
1 = Bus turnaround time-out has occurred
0 = No bus turnaround time-out has occurred
bit 3
DFN8EF: Data Field Size Error Flag bit
1 = Data field was not an integral number of bytes
0 = Data field was an integral number of bytes
bit 2
CRC16EF: CRC16 Failure Flag bit
1 = CRC16 failed
0 = CRC16 passed
bit 1
For Device Mode:
CRC5EF: CRC5 Host Error Flag bit
1 = Token packet is rejected due to CRC5 error
0 = Token packet is accepted (no CRC5 error)
For Host Mode:
EOFEF: End-of-Frame (EOF) Error Flag bit
1 = End-of-Frame error has occurred
0 = End-of-Frame interrupt is disabled
bit 0
PIDEF: PID Check Failure Flag bit
1 = PID check failed
0 = PID check passed
Note:
Individual bits can only be cleared by writing a ‘1’ to the bit position as part of a word write operation on the
entire register. Using Boolean instructions or bitwise operations to write to a single bit position will cause
all set bits, at the moment of the write, to become cleared.
 2015 Microchip Technology Inc.
DS30010089C-page 353
PIC24FJ256GA412/GB412 FAMILY
REGISTER 20-20: U1EIE: USB ERROR INTERRUPT ENABLE REGISTER
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
R/W-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
BTSEE
—
DMAEE
BTOEE
DFN8EE
CRC16EE
CRC5EE
PIDEE
EOFEE
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-8
Unimplemented: Read as ‘0’
bit 7
BTSEE: Bit Stuff Error Interrupt Enable bit
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 6
Unimplemented: Read as ‘0’
bit 5
DMAEE: DMA Error Interrupt Enable bit
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 4
BTOEE: Bus Turnaround Time-out Error Interrupt Enable bit
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 3
DFN8EE: Data Field Size Error Interrupt Enable bit
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 2
CRC16EE: CRC16 Failure Interrupt Enable bit
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 1
For Device Mode:
CRC5EE: CRC5 Host Error Interrupt Enable bit
1 = Interrupt is enabled
0 = Interrupt is disabled
For Host Mode:
EOFEE: End-of-Frame (EOF) Error interrupt Enable bit
1 = Interrupt is enabled
0 = Interrupt is disabled
bit 0
PIDEE: PID Check Failure Interrupt Enable bit
1 = Interrupt is enabled
0 = Interrupt is disabled
DS30010089C-page 354
x = Bit is unknown
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
20.7.3
USB ENDPOINT MANAGEMENT
REGISTERS
REGISTER 20-21: U1EPn: USB ENDPOINT n CONTROL REGISTERS (n = 0 to 15)
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
R/W-0
R/W-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
LSPD(1)
RETRYDIS(1)
—
EPCONDIS
EPRXEN
EPTXEN
EPSTALL
EPHSHK
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-8
Unimplemented: Read as ‘0’
bit 7
LSPD: Low-Speed Direct Connection Enable bit (U1EP0 only)(1)
1 = Direct connection to a low-speed device is enabled
0 = Direct connection to a low-speed device is disabled
bit 6
RETRYDIS: Retry Disable bit (U1EP0 only)(1)
1 = Retry NAK transactions are disabled
0 = Retry NAK transactions are enabled; retry is done in hardware
bit 5
Unimplemented: Read as ‘0’
bit 4
EPCONDIS: Bidirectional Endpoint Control bit
If EPTXEN and EPRXEN = 1:
1 = Disables Endpoint n from control transfers; only TX and RX transfers are allowed
0 = Enables Endpoint n for control (SETUP) transfers; TX and RX transfers are also allowed
For All Other Combinations of EPTXEN and EPRXEN:
This bit is ignored.
bit 3
EPRXEN: Endpoint Receive Enable bit
1 = Endpoint n receive is enabled
0 = Endpoint n receive is disabled
bit 2
EPTXEN: Endpoint Transmit Enable bit
1 = Endpoint n transmit is enabled
0 = Endpoint n transmit is disabled
bit 1
EPSTALL: Endpoint STALL Status bit
1 = Endpoint n was stalled
0 = Endpoint n was not stalled
bit 0
EPHSHK: Endpoint Handshake Enable bit
1 = Endpoint handshake is enabled
0 = Endpoint handshake is disabled (typically used for isochronous endpoints)
Note 1:
These bits are available only for U1EP0 and only in Host mode. For all other U1EPn registers, these bits
are always unimplemented and read as ‘0’.
 2015 Microchip Technology Inc.
DS30010089C-page 355
PIC24FJ256GA412/GB412 FAMILY
NOTES:
DS30010089C-page 356
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
21.0
Note:
ENHANCED PARALLEL
MASTER PORT (EPMP)
• Programmable Strobe Options (per Chip Select):
- Individual Read and Write Strobes or;
- Read/Write Strobe with Enable Strobe
• Programmable Address/Data Multiplexing
• Programmable Address Wait States
• Programmable Data Wait States (per Chip Select)
• Programmable Polarity on Control Signals
(per Chip Select)
• Legacy Parallel Slave Port Support
• Enhanced Parallel Slave Support:
- Address Support
- 4-Byte Deep Auto-Incrementing Buffer
This data sheet summarizes the features of
this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to
the “dsPIC33/PIC24 Family Reference
Manual”, “Enhanced Parallel Master Port
(EPMP)” (DS39730). The information in this
data sheet supersedes the information in
the FRM.
The Enhanced Parallel Master Port (EPMP) module
provides a parallel, 4-bit (Master mode only), 8-bit
(Master and Slave modes) or 16-bit (Master mode only)
data bus interface to communicate with off-chip
modules, such as memories, FIFOs, LCD controllers
and other microcontrollers. This module can serve as
either the master or the slave on the communication
bus.
21.1
While all PIC24FJ256GA412/GB412 family devices
implement the EPMP, I/O pin constraints place some
limits on 16-Bit Master mode operations in some package types. This is reflected in the number of dedicated
Chip Select pins implemented and the number of dedicated address lines that are available. The differences
are summarized in Table 21-1. All available EPMP pin
functions are summarized in Table 21-2.
For EPMP Master modes, all external addresses are
mapped into the internal Extended Data Space (EDS).
This is done by allocating a region of the EDS for each
Chip Select (CS), and then assigning each Chip Select
to a particular external resource, such as a memory or
external controller. This region should not be assigned
to another device resource, such as RAM or SFRs. To
perform a write or read on an external resource, the
CPU simply performs a write or read within the address
range assigned for the EPMP.
For 64-pin devices, the dedicated Chip Select pins
(PMCS1 and PMCS2) are not implemented. In addition, only 16 address lines (PMA<15:0>) are available.
If required, PMA14 and PMA15 can be remapped to
function as PMCS1 and PMCS2, respectively.
The memory space addressable by the device
depends on the number of address lines available, as
well as the number of Chip Select signals required for
the application. Devices with lower pin counts are more
affected by Chip Select requirements, as these take
away address lines. Table 21-1 shows the maximum
addressable range for each pin count.
Key features of the EPMP module are:
• Extended Data Space (EDS) Interface allows
Direct Access from the CPU
• Up to 23 Programmable Address Lines
• Up to 2 Chip Select Lines
• Up to 2 Acknowledgment Lines
(one per Chip Select)
• 4-Bit, 8-Bit or 16-Bit Wide Data Bus
TABLE 21-1:
Specific Package Variations
EPMP FEATURE DIFFERENCES BY DEVICE PIN COUNT
Dedicated Chip Select
Address Range (bytes)
CS1
CS2
Address
Lines
PIC24FJXXXGX406 (64-pin)
—
—
16
PIC24FJXXXGX410 (100-pin)
X
X
23
16M
PIC24FJXXXGX412 (121-pin)
X
X
23
16M
Device
 2015 Microchip Technology Inc.
No CS
1 CS
2 CS
64K
32K
16K
DS30010089C-page 357
PIC24FJ256GA412/GB412 FAMILY
TABLE 21-2:
ENHANCED PARALLEL MASTER PORT PIN DESCRIPTIONS
Pin Name
(Alternate Function)
PMA<22:16>
PMA15
(PMCS2)
PMA14
(PMCS1)
Type
Description
O
Address Bus bits<22:16>
O
Address Bus bit 15
I/O
Data Bus bit 15 (16-bit port with Multiplexed Addressing)
O
Chip Select 2 (alternate location)
O
Address Bus bit 14
I/O
Data Bus bit 14 (16-bit port with Multiplexed Addressing)
O
Chip Select 1 (alternate location)
O
Address Bus bits<13:8>
I/O
Data Bus bits<13:8> (16-bit port with Multiplexed Addressing)
PMA<7:3>
O
Address Bus bits<7:3>
PMA2
O
Address Bus bit 2
PMA<13:8>
(PMALU)
O
Address Latch Upper Strobe for Multiplexed Address
PMA1
I/O
Address Bus bit 1
(PMALH)
O
Address Latch High Strobe for Multiplexed Address
PMA0
I/O
Address Bus bit 0
(PMALL)
O
Address Latch Low Strobe for Multiplexed Address
PMD<15:8>
I/O
Data Bus bits<15:8> (Demultiplexed Addressing)
PMD<7:4>
I/O
Data Bus bits<7:4>
O
Address Bus bits<7:4> (4-bit port with 1-Phase Multiplexed Addressing)
PMD<3:0>
I/O
Data Bus bits<3:0>
PMCS1(1)
I/O
Chip Select 1
PMCS2(1)
O
Chip Select 2
PMWR
I/O
Write Strobe(2)
(PMENB)
I/O
Enable Signal(2)
PMRD
I/O
Read Strobe(2)
(PMRD/PMWR)
I/O
Read/Write Signal(2)
PMBE1
O
Byte Indicator
PMBE0
O
Nibble or Byte Indicator
PMACK1
I
Acknowledgment Signal 1
PMACK2
I
Acknowledgment Signal 2
Note 1:
2:
These pins are implemented in 100-pin and 121-pin devices only.
Signal function depends on the setting of the MODE<1:0> and SM bits (PMCON1<9:8> and PMCSxCF<8>).
DS30010089C-page 358
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 21-1:
PMCON1: EPMP CONTROL REGISTER 1
R/W-0
PMPEN
bit 15
U-0
—
R/W-0
PSIDL
R/W-0
ADRMUX1
R/W-0
ADRMUX0
U-0
—
R/W-0
MODE1
R/W-0
MODE0
bit 8
R/W-0
CSF1
bit 7
R/W-0
CSF0
R/W-0
ALP
R/W-0
ALMODE
U-0
—
R/W-0
BUSKEEP
R/W-0
IRQM1
R/W-0
IRQM0
bit 0
Legend:
R = Readable bit
-n = Value at POR
bit 15
bit 14
bit 13
bit 12-11
bit 10
bit 9-8
bit 7-6
bit 5
bit 4
bit 3
bit 2
bit 1-0
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
PMPEN: Parallel Master Port Enable bit
1 = EPMP is enabled
0 = EPMP is disabled
Unimplemented: Read as ‘0’
PSIDL: Parallel Master Port Stop in Idle Mode bit
1 = Discontinues module operation when device enters Idle mode
0 = Continues module operation in Idle mode
ADRMUX<1:0>: Address/Data Multiplexing Selection bits
11 = Lower address bits are multiplexed with data bits using 3 address phases
10 = Lower address bits are multiplexed with data bits using 2 address phases
01 = Lower address bits are multiplexed with data bits using 1 address phase
00 = Address and data appear on separate pins
Unimplemented: Read as ‘0’
MODE<1:0>: Parallel Port Mode Select bits
11 = Master mode
10 = Enhanced PSP; pins used are PMRD, PMWR, PMCS, PMD<7:0> and PMA<1:0>
01 = Buffered PSP; pins used are PMRD, PMWR, PMCS and PMD<7:0>
00 = Legacy Parallel Slave Port; pins used are PMRD, PMWR, PMCS and PMD<7:0>
CSF<1:0>: Chip Select Function bits
11 = Reserved
10 = PMA15 is used for Chip Select 2, PMA14 is used for Chip Select 1
01 = PMA15 is used for Chip Select 2, PMCS1 is used for Chip Select 1
00 = PMCS2 is used for Chip Select 2, PMCS1 is used for Chip Select 1
ALP: Address Latch Polarity bit
1 = Active-high (PMALL, PMALH and PMALU)
0 = Active-low (PMALL, PMALH and PMALU)
ALMODE: Address Latch Strobe Mode bit
1 = Enables “smart” address strobes (each address phase is only present if the current access would
cause a different address in the latch than the previous address)
0 = Disables “smart” address strobes
Unimplemented: Read as ‘0’
BUSKEEP: Bus Keeper bit
1 = Data bus keeps its last value when not actively being driven
0 = Data bus is in a high-impedance state when not actively being driven
IRQM<1:0>: Interrupt Request Mode bits
11 = Interrupt is generated when Read Buffer 3 is read or Write Buffer 3 is written (Buffered PSP mode),
or on a read or write operation when PMA<1:0> = 11 (Addressable PSP mode only)
10 = Reserved
01 = Interrupt is generated at the end of a read/write cycle
00 = No interrupt is generated
 2015 Microchip Technology Inc.
DS30010089C-page 359
PIC24FJ256GA412/GB412 FAMILY
REGISTER 21-2:
PMCON2: EPMP CONTROL REGISTER 2
R-0, HSC
U-0
R/C-0, HS
R/C-0, HS
U-0
U-0
U-0
U-0
BUSY
—
ERROR
TIMEOUT
—
—
—
—
bit 15
bit 8
R/W-0
R/W-0
(1)
RADDR23
R/W-0
(1)
RADDR22
R/W-0
(1)
RADDR21
R/W-0
(1)
RADDR20
R/W-0
(1)
RADDR19
R/W-0
(1)
RADDR18
R/W-0
(1)
RADDR17
RADDR16(1)
bit 7
bit 0
Legend:
C = Clearable bit
HSC = Hardware Settable/Clearable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
BUSY: Busy bit (Master mode only)
1 = Port is busy
0 = Port is not busy
bit 14
Unimplemented: Read as ‘0’
bit 13
ERROR: Error bit
1 = Transaction error (illegal transaction was requested)
0 = Transaction completed successfully
bit 12
TIMEOUT: Time-out bit
1 = Transaction timed out
0 = Transaction completed successfully
bit 11-8
Unimplemented: Read as ‘0’
bit 7-0
RADDR<23:16>: Parallel Master Port Reserved Address Space bits(1)
Note 1:
HS = Hardware Settable bit
If RADDR<23:16> = 00000000, then the last EDS address for Chip Select 2 will be FFFFFFh.
DS30010089C-page 360
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 21-3:
PMCON3: EPMP CONTROL REGISTER 3
R/W-0
R/W-0
R/W-0
R/W-0
U-0
R/W-0
R/W-0
R/W-0
PTWREN
PTRDEN
PTBE1EN
PTBE0EN
—
AWAITM1
AWAITM0
AWAITE
bit 15
bit 8
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
PTEN22(1)
PTEN21(1)
PTEN20(1)
PTEN19(1)
PTEN18(1)
PTEN17(1)
PTEN16(1)
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
PTWREN: Parallel Master Port Write/Enable Strobe Port Enable bit
1 = PMWR/PMENB port is enabled
0 = PMWR/PMENB port is disabled
bit 14
PTRDEN: Parallel Master Port Read/Write Strobe Port Enable bit
1 = PMRD/PMWR port is enabled
0 = PMRD/PMWR port is disabled
bit 13
PTBE1EN: Parallel Master Port High Nibble/Byte Enable Port Enable bit
1 = PMBE1 port is enabled
0 = PMBE1 port is disabled
bit 12
PTBE0EN: Parallel Master Port Low Nibble/Byte Enable Port Enable bit
1 = PMBE0 port is enabled
0 = PMBE0 port is disabled
bit 11
Unimplemented: Read as ‘0’
bit 10-9
AWAITM<1:0>: Address Latch Strobe Wait States bits
11 = Wait of 3½ TCY
10 = Wait of 2½ TCY
01 = Wait of 1½ TCY
00 = Wait of ½ TCY
bit bit 8
AWAITE: Address Hold After Address Latch Strobe Wait States bit
1 = Wait of 1¼ TCY
0 = Wait of ¼ TCY
bit 7
Unimplemented: Read as ‘0’
bit 6-0
PTEN<22:16>: EPMP Address Port Enable bits(1)
1 = PMA<22:16> function as EPMP address lines
0 = PMA<22:16> function as port I/Os
Note 1:
x = Bit is unknown
These bits are not available in 64-pin devices (PIC24FJXXXGA406/GB406).
 2015 Microchip Technology Inc.
DS30010089C-page 361
PIC24FJ256GA412/GB412 FAMILY
REGISTER 21-4:
PMCON4: EPMP CONTROL REGISTER 4
R/W-0
R/W-0
PTEN15
PTEN14
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
PTEN<13:8>
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
PTEN<7:3>
R/W-0
PTEN<2:0>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
PTEN15: PMA15 Port Enable bit
1 = PMA15 functions as either Address Line 15 or Chip Select 2
0 = PMA15 functions as port I/O
bit 14
PTEN14: PMA14 Port Enable bit
1 = PMA14 functions as either Address Line 14 or Chip Select 1
0 = PMA14 functions as port I/O
bit 13-3
PTEN<13:3>: EPMP Address Port Enable bits
1 = PMA<13:3> function as EPMP address lines
0 = PMA<13:3> function as port I/Os
bit 2-0
PTEN<2:0>: PMALU/PMALH/PMALL Strobe Enable bits
1 = PMA<2:0> function as either address lines or address latch strobes
0 = PMA<2:0> function as port I/Os
DS30010089C-page 362
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 21-5:
PMCSxCF: EPMP CHIP SELECT x CONFIGURATION REGISTER
R/W-0
R/W-0
R/W-0
R/W-0
U-0
R/W-0
R/W-0
R/W-0
CSDIS
CSP
CSPTEN
BEP
—
WRSP
RDSP
SM
bit 15
bit 8
R/W-0
R/W-0
R/W-0
U-0
U-0
U-0
U-0
U-0
ACKP
PTSZ1
PTSZ0
—
—
—
—
—
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
CSDIS: Chip Select x Disable bit
1 = Disables the Chip Select x functionality
0 = Enables the Chip Select x functionality
bit 14
CSP: Chip Select x Polarity bit
1 = Active-high (PMCSx)
0 = Active-low (PMCSx)
bit 13
CSPTEN: PMCSx Port Enable bit
1 = PMCSx port is enabled
0 = PMCSx port is disabled
bit 12
BEP: Chip Select x Nibble/Byte Enable Polarity bit
1 = Nibble/byte enable is active-high (PMBE0, PMBE1)
0 = Nibble/byte enable is active-low (PMBE0, PMBE1)
bit 11
Unimplemented: Read as ‘0’
bit 10
WRSP: Chip Select x Write Strobe Polarity bit
For Slave Modes and Master Mode when SM = 0:
1 = Write strobe is active-high (PMWR)
0 = Write strobe is active-low (PMWR)
For Master Mode when SM = 1:
1 = Enable strobe is active-high (PMENB)
0 = Enable strobe is active-low (PMENB)
bit 9
RDSP: Chip Select x Read Strobe Polarity bit
For Slave Modes and Master Mode when SM = 0:
1 = Read strobe is active-high (PMRD)
0 = Read strobe is active-low (PMRD)
For Master Mode when SM = 1:
1 = Read/write strobe is active-high (PMRD/PMWR)
0 = Read/Write strobe is active-low (PMRD/PMWR)
bit 8
SM: Chip Select x Strobe Mode bit
1 = Read/write and enable strobes (PMRD/PMWR and PMENB)
0 = Read and write strobes (PMRD and PMWR)
bit 7
ACKP: Chip Select x Acknowledge Polarity bit
1 = ACK is active-high (PMACK1)
0 = ACK is active-low (PMACK1)
bit 6-5
PTSZ<1:0>: Chip Select x Port Size bits
11 = Reserved
10 = 16-bit port size (PMD<15:0>)
01 = 4-bit port size (PMD<3:0>)
00 = 8-bit port size (PMD<7:0>)
bit 4-0
Unimplemented: Read as ‘0’
 2015 Microchip Technology Inc.
x = Bit is unknown
DS30010089C-page 363
PIC24FJ256GA412/GB412 FAMILY
PMCSxBS: EPMP CHIP SELECT x BASE ADDRESS REGISTER(2)
REGISTER 21-6:
R/W(1)
R/W(1)
R/W(1)
R/W(1)
R/W(1)
R/W(1)
R/W(1)
R/W(1)
BASE<23:16>
bit 15
bit 8
R/W(1)
U-0
U-0
U-0
U-0
U-0
U-0
U-0
BASE15
—
—
—
—
—
—
—
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-7
BASE<23:15>: Chip Select x Base Address bits(1)
bit 6-0
Unimplemented: Read as ‘0’
Note 1:
2:
x = Bit is unknown
The value at POR is 0080h for PMCS1BS and 0880h for PMCS2BS.
If the whole PMCS2BS register is written together as 0000h, then the last EDS address for Chip Select 1
will be FFFFFFh. In this case, Chip Select 2 should not be used. PMCS1BS has no such feature.
DS30010089C-page 364
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 21-7:
PMCSxMD: EPMP CHIP SELECT x MODE REGISTER
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
U-0
U-0
U-0
ACKM1
ACKM0
AMWAIT2
AMWAIT1
AMWAIT0
—
—
—
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
DWAITB1
DWAITB0
DWAITM3
DWAITM2
DWAITM1
DWAITM0
DWAITE1
DWAITE0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
ACKM<1:0>: Chip Select x Acknowledge Mode bits
11 = Reserved
10 = PMACKx is used to determine when a read/write operation is complete
01 = PMACKx is used to determine when a read/write operation is complete with time-out
(If DWAITM<3:0> = 0000, the maximum time-out is 255 TCY or else it is DWAITM<3:0> cycles.)
00 = PMACKx is not used
bit 13-11
AMWAIT<2:0>: Chip Select x Alternate Master Wait States bits
111 = Wait of 10 alternate master cycles
...
001 = Wait of 4 alternate master cycles
000 = Wait of 3 alternate master cycles
bit 10-8
Unimplemented: Read as ‘0’
bit 7-6
DWAITB<1:0>: Chip Select x Data Setup Before Read/Write Strobe Wait States bits
11 = Wait of 3¼ TCY
10 = Wait of 2¼ TCY
01 = Wait of 1¼ TCY
00 = Wait of ¼ TCY
bit 5-2
DWAITM<3:0>: Chip Select x Data Read/Write Strobe Wait States bits
For Write Operations:
1111 = Wait of 15½ TCY
...
0001 = Wait of 1½ TCY
0000 = Wait of ½ TCY
For Read Operations:
1111 = Wait of 15¾ TCY
...
0001 = Wait of 1¾ TCY
0000 = Wait of ¾ TCY
bit 1-0
DWAITE<1:0>: Chip Select x Data Hold After Read/Write Strobe Wait States bits
For Write Operations:
11 = Wait of 3¼ TCY
10 = Wait of 2¼ TCY
01 = Wait of 1¼ TCY
00 = Wait of ¼ TCY
For Read Operations:
11 = Wait of 3 TCY
10 = Wait of 2 TCY
01 = Wait of 1 TCY
00 = Wait of 0 TCY
 2015 Microchip Technology Inc.
DS30010089C-page 365
PIC24FJ256GA412/GB412 FAMILY
REGISTER 21-8:
R-0, HSC
PMSTAT: EPMP STATUS REGISTER (SLAVE MODE ONLY)
R/W-0, HS
U-0
U-0
R-0, HSC
R-0, HSC
R-0, HSC
R-0, HSC
IBOV
—
—
IB3F(1)
IB2F(1)
IB1F(1)
IB0F(1)
IBF
bit 15
bit 8
R-1, HSC
R/W-0, HS
U-0
U-0
R-1, HSC
R-1, HSC
R-1, HSC
R-1, HSC
OBE
OBUF
—
—
OB3E
OB2E
OB1E
OB0E
bit 7
bit 0
Legend:
HS = Hardware Settable bit
HSC = Hardware Settable/Clearable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
IBF: Input Buffer Full Status bit
1 = All writable Input Buffer registers are full
0 = Some or all of the writable Input Buffer registers are empty
bit 14
IBOV: Input Buffer Overflow Status bit
1 = A write attempt to a full Input register occurred (must be cleared in software)
0 = No overflow occurred
bit 13-12
Unimplemented: Read as ‘0’
bit 11-8
IB3F:IB0F: Input Buffer x Status Full bits(1)
1 = Input buffer contains unread data (reading the buffer will clear this bit)
0 = Input buffer does not contain unread data
bit 7
OBE: Output Buffer Empty Status bit
1 = All readable Output Buffer registers are empty
0 = Some or all of the readable Output Buffer registers are full
bit 6
OBUF: Output Buffer Underflow Status bit
1 = A read occurred from an empty Output Buffer register (must be cleared in software)
0 = No underflow occurred
bit 5-4
Unimplemented: Read as ‘0’
bit 3-0
OB3E:OB0E: Output Buffer x Status Empty bits
1 = Output buffer is empty (writing data to the buffer will clear this bit)
0 = Output buffer contains untransmitted data
Note 1:
Even though an individual bit represents the byte in the buffer, the bits corresponding to the word (Byte 0
and 1, or Byte 2 and 3) get cleared, even on byte reading.
DS30010089C-page 366
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 21-9:
PADCON: PAD CONFIGURATION CONTROL REGISTER
R/W-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
IOCON
—
—
—
—
—
—
—
bit 15
bit 8
U-0
U-0
U-0
U-0
U-0
U-0
U-0
R/W-0
—
—
—
—
—
—
—
PMPTTL
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
IOCON: Interrupt-On-Change Enable bit
Not used by the EPMP; see Register 11-9 for definition.
bit 14-1
Unimplemented: Read as ‘0’
bit 0
PMPTTL: EPMP Module TTL Input Buffer Select bit
1 = EPMP module inputs (PMDx, PMCS1) use TTL input buffers
0 = EPMP module inputs use Schmitt Trigger input buffers
 2015 Microchip Technology Inc.
x = Bit is unknown
DS30010089C-page 367
PIC24FJ256GA412/GB412 FAMILY
NOTES:
DS30010089C-page 368
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
22.0
Note:
LIQUID CRYSTAL DISPLAY
(LCD) CONTROLLER
The LCD Controller has these features:
• Direct Driving of LCD Panel
• Three LCD Clock Sources with Selectable
Prescaler
• Up to Eight Commons:
- Static (one Common)
- 1/2 multiplex (two Commons)
- 1/3 multiplex (three Commons)
- 1/8 multiplex (eight Commons)
• Ability to Drive up to 34 (in 64-pin USB devices),
35 (64-pin non-USB devices) or up to 64 (all other
devices) Segments, depending on the
Multiplexing Mode Selected
• Static, 1/2 or 1/3 LCD Bias
• On-Chip Bias Generator with Dedicated Charge
Pump to Support a Range of Fixed and Variable
Bias Options
• Internal Resistors for Bias Voltage Generation
• Software Contrast Control for LCD using Internal
Biasing
This data sheet summarizes the features
of the PIC24FJ256GA412/GB412 family
devices. It is not intended to be a comprehensive reference source. To complement
the information in this data sheet, refer to
the “dsPIC33/PIC24 Family Reference
Manual”, “Liquid Crystal Display (LCD)”
(DS30009740) which is available from the
Microchip web site (www.microchip.com).
The Liquid Crystal Display (LCD) Controller generates
the data and timing control required to directly drive a
static or multiplexed LCD panel. The module can drive
up to 8 Commons signals on all devices, and from 34 to
64 Segments, depending on the specific device.
Note:
To be driven by the LCD controller, pins
must be set as analog inputs. For the port
corresponding to the desired Common or
Segment pin, set TRISx = 1 and ANSx = 1.
A simplified block diagram of the module is shown in
Figure 22-1.
FIGURE 22-1:
LCD CONTROLLER MODULE BLOCK DIAGRAM
Data Bus
LCD DATA
32 x 16 (= 8 x 64)
16
LCDDATA31
512
LCDDATA30
.
.
.
LCDDATA1
to
64
64
SEG<62:0>
MUX
LCDDATA0
Bias
Voltage
To I/O Pins
Timing Control
LCDCON
8
LCDPS
LCDSEx
COM<7:0>
LCD Bias Generation
LCDREG
LCDREF
Resistor Ladder
FRC Oscillator
LPRC Oscillator
SOSC
(Secondary Oscillator)
 2015 Microchip Technology Inc.
LCD Clock
Source Select
LCD
Charge Pump
DS30010089C-page 369
PIC24FJ256GA412/GB412 FAMILY
22.1
Registers
• LCD Voltage Ladder Control Register (LCDREF)
• Four LCD Segment Enable Registers
(LCDSE3:LCDSE0)
• Up to 32 LCD Data Registers
(LCDDATA31:LCDDATA0)
The LCD Controller has up to 40 registers:
• LCD Control Register (LCDCON)
• LCD Charge Pump Control Register (LCDREG)
• LCD Phase Register (LCDPS)
REGISTER 22-1:
LCDCON: LCD CONTROL REGISTER
R/W-0
U-0
R/W-0
U-0
U-0
U-0
U-0
U-0
LCDEN
—
LCDSIDL
—
—
—
—
—
bit 15
bit 8
U-0
R/W-0
R/C-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
SLPEN
WERR
CS1
CS0
LMUX2
LMUX1
LMUX0
bit 7
bit 0
Legend:
C = Clearable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
LCDEN: LCD Driver Enable bit
1 = LCD driver module is enabled
0 = LCD driver module is disabled
bit 14
Unimplemented: Read as ‘0’
bit 13
LCDSIDL: Stop LCD Drive in CPU Idle Mode Control bit
1 = LCD driver halts in CPU Idle mode
0 = LCD driver continues to operate in CPU Idle mode
bit 12-7
Unimplemented: Read as ‘0’
bit 6
SLPEN: LCD Driver Enable in Sleep Mode bit
1 = LCD driver module is disabled in Sleep mode
0 = LCD driver module is enabled in Sleep mode
bit 5
WERR: LCD Write Failed Error bit
1 = LCDDATAx register is written while WA (LCDPS<4>) = 0 (must be cleared in software)
0 = No LCD write error
bit 4-3
CS<1:0>: Clock Source Select bits
1x = SOSC
01 = LPRC
00 = FRC
bit 2-0
LMUX<2:0>: LCD Commons Select bits
LMUX<2:0>
Multiplex
Bias
(1)
1/3
111
1/8 MUX (COM<7:0>)
(1)
110
1/7 MUX (COM<6:0>)
1/3
101
1/6 MUX (COM<5:0>)(1)
1/3
1/3
100
1/5 MUX (COM<4:0>)(1)
011
1/4 MUX (COM<3:0>)
1/3
010
1/3 MUX (COM<2:0>)
1/2 or 1/3
001
1/2 MUX (COM<1:0>)
1/2 or 1/3
000
Static (COM0)
Static
Note 1: On 64-pin and 100-pin devices, COM4 through COM7 also have Segment functionality.
If the COM is enabled in multiplexing, the Segment will not be available on that pin.
DS30010089C-page 370
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 22-2:
LCDREG: LCD CHARGE PUMP CONTROL REGISTER
RW-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
CPEN
—
—
—
—
—
—
—
bit 15
bit 8
U-0
U-0
U-0
U-0
U-0
U-0
RW-0
RW-0
—
—
—
—
—
—
CKSEL1
CKSEL0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
CPEN: 3.6V Charge Pump Enable bit
1 = The regulator generates the highest (3.6V) voltage
0 = Highest voltage in the system is supplied externally (AVDD)
bit 14-2
Unimplemented: Read as ‘0’
bit 1-0
CLKSEL<1:0>: Regulator Clock Select Control bits
11 = SOSC
10 = 8 MHz FRC
01 = 31 kHz LPRC
00 = Disables regulator and floats regulator voltage output
 2015 Microchip Technology Inc.
x = Bit is unknown
DS30010089C-page 371
PIC24FJ256GA412/GB412 FAMILY
REGISTER 22-3:
LCDPS: LCD PHASE REGISTER
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
R/W-0
R/W-0
R-0
R-0
R/W-0
R/W-0
R/W-0
R/W-0
WFT
BIASMD
LCDA
WA
LP3
LP2
LP1
LP0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-8
Unimplemented: Read as ‘0’
bit 7
WFT: Waveform Type Select bit
1 = Type-B waveform (phase changes on each frame boundary)
0 = Type-A waveform (phase changes within each Common type)
bit 6
BIASMD: Bias Mode Select bit
When LMUX<2:0> = 000 or 011 through 111:
0 = Static Bias mode (do not set this bit to ‘1’)
When LMUX<2:0> = 001 or 010:
1 = 1/2 Bias mode
0 = 1/3 Bias mode
bit 5
LCDA: LCD Active Status bit
1 = LCD driver module is active
0 = LCD driver module is inactive
bit 4
WA: LCD Write Allow Status bit
1 = Write into the LCDDATAx registers is allowed
0 = Write into the LCDDATAx registers is not allowed
bit 3-0
LP<3:0>: LCD Prescaler Select bits
1111 = 1:16
1110 = 1:15
1101 = 1:14
1100 = 1:13
1011 = 1:12
1010 = 1:11
1001 = 1:10
1000 = 1:9
0111 = 1:8
0110 = 1:7
0101 = 1:6
0100 = 1:5
0011 = 1:4
0010 = 1:3
0001 = 1:2
0000 = 1:1
DS30010089C-page 372
x = Bit is unknown
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 22-4:
LCDSEx: LCD SEGMENT x ENABLE REGISTER
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
SE(n+15)(1,2)
SE(n+14)
SE(n+13)
SE(n+12)
SE(n+11)
SE(n+10)
SE(n+9)
SE(n+8)
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
SE(n+7)
SE(n+6)
SE(n+5)
SE(n+4)
SE(n+3)
SE(n+2)
SE(n+1)
SE(n)
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-0
Note 1:
2:
x = Bit is unknown
SE(n+15):SE(n): Segment Enable bits
For LCDSE0: n = 0
For LCDSE1: n = 16
For LCDSE2: n = 32
For LCDSE3: n = 48(1,2)
1 = Segment function of the pin is enabled, digital I/O is disabled
0 = Segment function of the pin is disabled, digital I/O is enabled
SE63 (LCDSE3<15>) is not implemented.
For the SEG49 to work correctly, the JTAG needs to be disabled.
REGISTER 22-5:
LCDDATAx: LCD DATA x REGISTER
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
S(n+15)Cy
S(n+14)Cy
S(n+13)Cy
S(n+12)Cy
S(n+11)Cy
S(n+10)Cy
S(n+9)Cy
S(n+8)Cy
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
S(n+7)Cy
S(n+6)Cy
S(n+5)Cy
S(n+4)Cy
S(n+3)Cy
S(n+2)Cy
S(n+1)Cy
S(n)Cy
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-0
x = Bit is unknown
S(n+15)Cy:S(n)Cy: Pixel On bits
For Registers, LCDDATA0 through LCDDATA3: n = (16x), y = 0
For Registers, LCDDATA4 through LCDDATA7: n = (16(x – 4)), y = 1
For Registers, LCDDATA8 through LCDDATA11: n = (16(x – 8)), y = 2
For Registers, LCDDATA12 through LCDDATA15: n = (16(x – 12)), y = 3
For Registers, LCDDATA16 through LCDDATA19: n = (16(x – 16)), y = 4
For Registers, LCDDATA20 through LCDDATA23: n = (16(x – 20)), y = 5
For Registers, LCDDATA24 through LCDDATA27: n = (16(x – 24)), y = 6
For Registers, LCDDATA28 through LCDDATA31: n = (16(x – 28)), y = 7
1 = Pixel is on
0 = Pixel is off
 2015 Microchip Technology Inc.
DS30010089C-page 373
PIC24FJ256GA412/GB412 FAMILY
TABLE 22-1:
LCDDATA REGISTERS AND BITS FOR SEGMENT AND COM COMBINATIONS
Segments
COM Lines
0 to 15
16 to 31
32 to 47
48 to 64
0
LCDDATA0
S00C0:S15C0
LCDDATA1
S16C0:S31C0
LCDDATA2
S32C0:S47C0
LCDDATA3
S48C0:S63C0
1
LCDDATA4
S00C1:S15C1
LCDDATA5
S16C1:S31C1
LCDDATA6
S32C1:S47C1
LCDDATA7
S48C1:S63C1
2
LCDDATA8
S00C2:S15C2
LCDDATA9
S16C2:S31C2
LCDDATA10
S32C2:S47C2
LCDDATA11
S48C2:S63C2
3
LCDDATA12
S00C3:S15C3
LCDDATA13
S16C3:S31C3
LCDDATA14
S32C3:S47C3
LCDDATA15
S48C3:S63C3
4
LCDDATA16
S00C4:S15C4
LCDDATA17
S16C4:S31C4
LCDDATA18
S32C4:S47C4
LCDDATA19
S48C4:S59C4
5
LCDDATA20
S00C5:S15C5
LCDDATA21
S16C5:S31C5
LCDDATA22
S32C5:S47C5
LCDDATA23
S48C5:S69C5
6
LCDDATA24
S00C6:S15C6
LCDDATA25
S16C6:S31C6
LCDDATA26
S32C6:S47C6
LCDDATA27
S48C6:S59C6
7
LCDDATA28
S00C7:S15C7
LCDDATA29
S16C7:S31C7
LCDDATA30
S32C7:S47C7
LCDDATA31
S48C7:S59C7
DS30010089C-page 374
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 22-6:
LCDREF: LCD REFERENCE LADDER CONTROL REGISTER
R/W-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
LCDIRE
—
LCDCST2
LCDCST1
LCDCST0
VLCD3PE
VLCD2PE
VLCD1PE
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
U-0
R/W-0
R/W-0
R/W-0
LRLAP1
LRLAP0
LRLBP1
LRLBP0
—
LRLAT2
LRLAT1
LRLAT0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
LCDIRE: LCD Internal Reference Enable bit
1 = Internal LCD reference is enabled and connected to the internal contrast control circuit
0 = Internal LCD reference is disabled
bit 14
Unimplemented: Read as ‘0’
bit 13-11
LCDCST<2:0>: LCD Contrast Control bits
Selects the Resistance of the LCD Contrast Control Resistor Ladder:
111 = Resistor ladder is at maximum resistance (minimum contrast)
110 = Resistor ladder is at 6/7th of maximum resistance
101 = Resistor ladder is at 5/7th of maximum resistance
100 = Resistor ladder is at 4/7th of maximum resistance
011 = Resistor ladder is at 3/7th of maximum resistance
010 = Resistor ladder is at 2/7th of maximum resistance
001 = Resistor ladder is at 1/7th of maximum resistance
000 = Minimum resistance (maximum contrast); resistor ladder is shorted
bit 10
VLCD3PE: LCD Bias 3 Pin Enable bit
1 = Bias 3 level is connected to the external pin, LCDBIAS3
0 = Bias 3 level is internal (internal resistor ladder)
bit 9
VLCD2PE: LCD Bias 2 Pin Enable bit
1 = Bias 2 level is connected to the external pin, LCDBIAS2
0 = Bias 2 level is internal (internal resistor ladder)
bit 8
VLCD1PE: LCD Bias 1 Pin Enable bit
1 = Bias 1 level is connected to the external pin, LCDBIAS1
0 = Bias 1 level is internal (internal resistor ladder)
bit 7-6
LRLAP<1:0>: LCD Reference Ladder A Time Power Control bits
During Time Interval A:
11 = Internal LCD reference ladder is powered in High-Power mode
10 = Internal LCD reference ladder is powered in Medium Power mode
01 = Internal LCD reference ladder is powered in Low-Power mode
00 = Internal LCD reference ladder is powered down and unconnected
bit 5-4
LRLBP<1:0>: LCD Reference Ladder B Time Power Control bits
During Time Interval B:
11 = Internal LCD reference ladder is powered in High-Power mode
10 = Internal LCD reference ladder is powered in Medium Power mode
01 = Internal LCD reference ladder is powered in Low-Power mode
00 = Internal LCD reference ladder is powered down and unconnected
bit 3
Unimplemented: Read as ‘0’
 2015 Microchip Technology Inc.
DS30010089C-page 375
PIC24FJ256GA412/GB412 FAMILY
REGISTER 22-6:
bit 2-0
LCDREF: LCD REFERENCE LADDER CONTROL REGISTER (CONTINUED)
LRLAT<2:0>: LCD Reference Ladder A Time Interval Control bits
Sets the number of 32 clock counts when the A Time Interval Power mode is active.
For Type-A Waveforms (WFT = 0):
111 = Internal LCD reference ladder is in A Power mode for 7 clocks and B Power mode for 9 clocks
110 = Internal LCD reference ladder is in A Power mode for 6 clocks and B Power mode for 10 clocks
101 = Internal LCD reference ladder is in A Power mode for 5 clocks and B Power mode for 11 clocks
100 = Internal LCD reference ladder is in A Power mode for 4 clocks and B Power mode for 12 clocks
011 = Internal LCD reference ladder is in A Power mode for 3 clocks and B Power mode for 13 clocks
010 = Internal LCD reference ladder is in A Power mode for 2 clocks and B Power mode for 14 clocks
001 = Internal LCD reference ladder is in A Power mode for 1 clock and B Power mode for 15 clocks
000 = Internal LCD reference ladder is always in B Power mode
For Type-B Waveforms (WFT = 1):
111 = Internal LCD reference ladder is in A Power mode for 7 clocks and B Power mode for 25 clocks
110 = Internal LCD reference ladder is in A Power mode for 6 clocks and B Power mode for 26 clocks
101 = Internal LCD reference ladder is in A Power mode for 5 clocks and B Power mode for 27 clocks
100 = Internal LCD reference ladder is in A Power mode for 4 clocks and B Power mode for 28 clocks
011 = Internal LCD reference ladder is in A Power mode for 3 clocks and B Power mode for 29 clocks
010 = Internal LCD reference ladder is in A Power mode for 2 clocks and B Power mode for 30 clocks
001 = Internal LCD reference ladder is in A Power mode for 1 clock and B Power mode for 31 clocks
000 = Internal LCD reference ladder is always in B Power mode
DS30010089C-page 376
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
23.0
CONFIGURABLE LOGIC CELL
(CLC)
Note:
This data sheet summarizes the features
of the PIC24FJ256GA412/GB412 family
devices. It is not intended to be a comprehensive reference source. To complement
the information in this data sheet, refer to
the “dsPIC33/PIC24 Family Reference
Manual”, “Configurable Logic Cell (CLC)”
(DS33949), which is available from the
Microchip web site (www.microchip.com).
FIGURE 23-1:
DS1<2:0>
DS2<2:0>
DS3<2:0>
DS4<2:0>
The Configurable Logic Cell (CLC) module allows the
user to specify combinations of signals as inputs to a
logic function and to use the logic output to control
other peripherals or I/O pins. This provides greater flexibility and potential in embedded designs since the CLC
module can operate outside the limitations of software
execution and supports a vast amount of output
designs.
There are four input gates to the selected logic function. These four input gates select from a pool of up to
32 signals that are selected using four data source
selection multiplexers. Figure 23-1 shows an overview
of the module. Figure 23-3 shows the details of the data
source multiplexers and logic input gate connections.
CLCx MODULE
G1POL
G2POL
G3POL
G4POL
D
FCY
MODE<2:0>
CLC
Inputs
(32)
CLCx
Output
Logic
Function Logic
CLK
TRISx Control
CLCx
Output
See Figure 23-2
See Figure 23-3
LCOUT
LCOE
LCEN
Gate 1
Input
Gate 2
Data
Gate 3
Selection
Gate 4
Gates
Q
LCPOL
Interrupt
det
INTP
Set
CLCxIF
INTN
Interrupt
det
 2015 Microchip Technology Inc.
DS30010089C-page 377
PIC24FJ256GA412/GB412 FAMILY
FIGURE 23-2:
CLCx LOGIC FUNCTION COMBINATORIAL OPTIONS
AND – OR
OR – XOR
Gate 1
Gate 1
Gate 2
Logic Output
Gate 3
Gate 2
Logic Output
Gate 3
Gate 4
Gate 4
MODE<2:0> = 000
MODE<2:0> = 001
4-Input AND
S-R Latch
Gate 1
Gate 1
Gate 2
Gate 2
Logic Output
Gate 3
Gate 4
S
Gate 3
Q
R
Gate 4
MODE<2:0> = 010
MODE<2:0> = 011
1-Input D Flip-Flop with S and R
2-Input D Flip-Flop with R
Gate 4
D
Gate 2
S
Gate 4
Q
Logic Output
D
Gate 2
Gate 1
Gate 1
Logic Output
Q
Logic Output
R
R
Gate 3
Gate 3
MODE<2:0> = 100
MODE<2:0> = 101
J-K Flip-Flop with R
1-Input Transparent Latch with S and R
Gate 4
Gate 2
J
Q
Logic Output
Gate 1
K
Gate 4
R
Gate 2
D
Gate 1
LE
Gate 3
S
Q
Logic Output
R
Gate 3
MODE<2:0> = 110
DS30010089C-page 378
MODE<2:0> = 111
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
FIGURE 23-3:
CLCx INPUT SOURCE SELECTION DIAGRAM
Data Selection
Input 0
Input 1
Input 2
Input 3
Input 4
Input 5
Input 6
Input 7
000
Data Gate 1
Data 1 Non-Inverted
G1D1T
Data 1
Inverted
G1D1N
111
DS1x (CLCxSEL<2:0>)
G1D2T
G1D2N
Input 8
Input 9
Input 10
Input 11
Input 12
Input 13
Input 14
Input 15
G1D3T
Data 2 Non-Inverted
Data 2
Inverted
G1D4T
000
G1D4N
Data Gate 2
Data 3 Non-Inverted
Data 3
Inverted
Gate 2
(Same as Data Gate 1)
Data Gate 3
111
Gate 3
DS3x (CLCxSEL<10:8>)
Input 24
Input 25
Input 26
Input 27
Input 28
Input 29
Input 30
Input 31
G1D3N
G1POL
(CLCxCONH<0>)
111
DS2x (CLCxSEL<6:4>)
Input 16
Input 17
Input 18
Input 19
Input 20
Input 21
Input 22
Input 23
Gate 1
000
(Same as Data Gate 1)
Data Gate 4
000
Gate 4
Data 4 Non-Inverted
(Same as Data Gate 1)
Data 4
Inverted
111
DS4x (CLCxSEL<14:12>)
Note:
All controls are undefined at power-up.
 2015 Microchip Technology Inc.
DS30010089C-page 379
PIC24FJ256GA412/GB412 FAMILY
23.1
Control Registers
The CLCx Input MUX Select register (CLCxSEL)
allows the user to select up to 4 data input sources
using the 4 data input selection multiplexers. Each
multiplexer has a list of 8 data sources available.
The CLCx module is controlled by the following registers:
•
•
•
•
•
CLCxCONL
CLCxCONH
CLCxSEL
CLCxGLSL
CLCxGLSH
The CLCx Gate Logic Input Select registers
(CLCxGLSL and CLCxGLSH) allow the user to select
which outputs from each of the selection MUXes are
used as inputs to the input gates of the logic cell. Each
data source MUX outputs both a true and a negated
version of its output. All of these 8 signals are enabled,
ORed together by the logic cell input gates.
The CLCx Control registers (CLCxCONL and
CLCxCONH) are used to enable the module and interrupts, control the output enable bit, select output polarity
and select the logic function. The CLCx Control registers
also allow the user to control the logic polarity of not only
the cell output, but also some intermediate variables.
REGISTER 23-1:
CLCxCONL: CLCx CONTROL REGISTER (LOW)
R/W-0
U-0
U-0
U-0
R/W-0
R/W-0
U-0
U-0
LCEN
—
—
—
INTP
INTN
—
—
bit 15
bit 8
R-0
R-0
LCOE
LCOUT
R/W-0
U-0
U-0
R/W-0
R/W-0
R/W-0
LCPOL
—
—
MODE2
MODE1
MODE0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
LCEN: CLCx Enable bit
1 = CLCx is enabled and mixing input signals
0 = CLCx is disabled and has logic zero outputs
bit 14-12
Unimplemented: Read as ‘0’
bit 11
INTP: CLCx Positive Edge Interrupt Enable bit
1 = Interrupt will be generated when a rising edge occurs on LCOUT
0 = Interrupt will not be generated
bit 10
INTN: CLCx Negative Edge Interrupt Enable bit
1 = Interrupt will be generated when a falling edge occurs on LCOUT
0 = Interrupt will not be generated
bit 9-8
Unimplemented: Read as ‘0’
bit 7
LCOE: CLCx Port Enable bit
1 = CLCx port pin output is enabled
0 = CLCx port pin output is disabled
bit 6
LCOUT: CLCx Data Output Status bit
1 = CLCx output high
0 = CLCx output low
bit 5
LCPOL: CLCx Output Polarity Control bit
1 = The output of the module is inverted
0 = The output of the module is not inverted
bit 4-3
Unimplemented: Read as ‘0’
DS30010089C-page 380
x = Bit is unknown
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 23-1:
bit 2-0
CLCxCONL: CLCx CONTROL REGISTER (LOW) (CONTINUED)
MODE<2:0>: CLCx Mode bits
111 = Single input transparent latch with S and R
110 = JK flip-flop with R
101 = Two-input D flip-flop with R
100 = Single input D flip-flop with S and R
011 = SR latch
010 = Four-input AND
001 = Four-input OR-XOR
000 = Four-input AND-OR
REGISTER 23-2:
CLCxCONH: CLCx CONTROL REGISTER (HIGH)
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
U-0
U-0
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
—
—
G4POL
G3POL
G2POL
G1POL
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-4
Unimplemented: Read as ‘0’
bit 3
G4POL: Gate 4 Polarity Control bit
1 = Channel 4 logic output is inverted when applied to the logic cell
0 = Channel 4 logic output is not inverted
bit 2
G3POL: Gate 3 Polarity Control bit
1 = Channel 3 logic output is inverted when applied to the logic cell
0 = Channel 3 logic output is not inverted
bit 1
G2POL: Gate 2 Polarity Control bit
1 = Channel 2 logic output is inverted when applied to the logic cell
0 = Channel 2 logic output is not inverted
bit 0
G1POL: Gate 1 Polarity Control bit
1 = Channel 1 logic output is inverted when applied to the logic cell
0 = Channel 1 logic output is not inverted
 2015 Microchip Technology Inc.
x = Bit is unknown
DS30010089C-page 381
PIC24FJ256GA412/GB412 FAMILY
REGISTER 23-3:
CLCxSEL: CLCx INPUT MUX SELECT REGISTER
U-0
R/W-0
R/W-0
R/W-0
U-0
R/W-0
R/W-0
R/W-0
—
DS42
DS41
DS40
—
DS32
DS31
DS30
bit 15
bit 8
U-0
R/W-0
R/W-0
R/W-0
U-0
R/W-0
R/W-0
R/W-0
—
DS22
DS21
DS20
—
DS12
DS11
DS10
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
Unimplemented: Read as ‘0’
bit 14-12
DS4<2:0>: Data Selection MUX 4 Signal Selection bits
111 = MCCP3 Compare Event Flag (CCP3IF)
110 = MCCP1 Compare Event Flag (CCP1IF)
101 = Unimplemented
100 = CTMU A/D trigger
011 = SPIx Input (SDIx) corresponding to CLCx module (see Table 23-1)
010 = Comparator 3 output
001 = Module-specific CLC output (see Table 23-1)
000 = CLCINB I/O pin
bit 11
Unimplemented: Read as ‘0’
bit 10-8
DS3<2:0>: Data Selection MUX 3 Signal Selection bits
111 = MCCP3 Compare Event Flag (CCP3IF)
110 = MCCP2 Compare Event Flag (CCP2IF)
101 = DMA Channel 1 interrupt
100 = UARTx RX output corresponding to CLCx module (see Table 23-1)
011 = SPIx Output (SDOx) corresponding to CLCx module (see Table 23-1)
010 = Comparator 2 output
001 = CLCx output (see Table 23-1)
000 = CLCINA I/O pin
bit 7
Unimplemented: Read as ‘0’
bit 6-4
DS2<2:0>: Data Selection MUX 2 Signal Selection bits
111 = MCCP2 Compare Event Flag (CCP2IF)
110 = MCCP1 Compare Event Flag (CCP1IF)
101 = DMA Channel 0 interrupt
100 = A/D conversion done interrupt
011 = UARTx TX input corresponding to CLCx module (see Table 23-1)
010 = Comparator 1 output
001 = CLCx output (see Table 23-1)
000 = CLCINB I/O pin
bit 3
Unimplemented: Read as ‘0’
bit 2-0
DS1<2:0>: Data Selection MUX 1 Signal Selection bits
111 = Timer3 match event
110 = Timer2 match event
101 = Unimplemented
100 = REFO output
011 = INTRC/LPRC clock source
010 = SOSC clock source
001 = System clock (TCY)
000 = CLCINA I/O pin
DS30010089C-page 382
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
TABLE 23-1:
MODULE-SPECIFIC INPUT DATA SOURCES
Input Source
Bit Field Value
DS4<2:0>
DS3<2:0>
DS2<2:0>
CLC1
CLC2
CLC3
CLC4
011
SDI1
SDI2
SDI3
SDI4
001
CLC2 Output
CLC1 Output
CLC4 Output
CLC3 Output
100
U1RX
U2RX
U3RX
U4RX
011
SDO1
SDO2
SDO3
SDO4
001
CLC1 Output
CLC2 Output
CLC3 Output
CLC4 Output
011
U1TX
U2TX
U3TX
U4TX
001
CLC2 Output
CLC1 Output
CLC4 Output
CLC3 Output
REGISTER 23-4:
CLCxGLSL: CLCx GATE LOGIC INPUT SELECT LOW REGISTER
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
G2D4T
G2D4N
G2D3T
G2D3N
G2D2T
G2D2N
G2D1T
G2D1N
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
G1D4T
G1D4N
G1D3T
G1D3N
G1D2T
G1D2N
G1D1T
G1D1N
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
G2D4T: Gate 2 Data Source 4 True Enable bit
1 = Data Source 4 inverted signal is enabled for Gate 2
0 = Data Source 4 inverted signal is disabled for Gate 2
bit 14
G2D4N: Gate 2 Data Source 4 Negated Enable bit
1 = Data Source 4 inverted signal is enabled for Gate 2
0 = Data Source 4 inverted signal is disabled for Gate 2
bit 13
G2D3T: Gate 2 Data Source 3 True Enable bit
1 = Data Source 3 inverted signal is enabled for Gate 2
0 = Data Source 3 inverted signal is disabled for Gate 2
bit 12
G2D3N: Gate 2 Data Source 3 Negated Enable bit
1 = Data Source 3 inverted signal is enabled for Gate 2
0 = Data Source 3 inverted signal is disabled for Gate 2
bit 11
G2D2T: Gate 2 Data Source 2 True Enable bit
1 = Data Source 2 inverted signal is enabled for Gate 2
0 = Data Source 2 inverted signal is disabled for Gate 2
bit 10
G2D2N: Gate 2 Data Source 2 Negated Enable bit
1 = Data Source 2 inverted signal is enabled for Gate 2
0 = Data Source 2 inverted signal is disabled for Gate 2
bit 9
G2D1T: Gate 2 Data Source 1 True Enable bit
1 = Data Source 1 inverted signal is enabled for Gate 2
0 = Data Source 1 inverted signal is disabled for Gate 2
 2015 Microchip Technology Inc.
x = Bit is unknown
DS30010089C-page 383
PIC24FJ256GA412/GB412 FAMILY
REGISTER 23-4:
CLCxGLSL: CLCx GATE LOGIC INPUT SELECT LOW REGISTER (CONTINUED)
bit 8
G2D1N: Gate 2 Data Source 1 Negated Enable bit
1 = Data Source 1 inverted signal is enabled for Gate 2
0 = Data Source 1 inverted signal is disabled for Gate 2
bit 7
G1D4T: Gate 1 Data Source 4 True Enable bit
1 = Data Source 4 inverted signal is enabled for Gate 1
0 = Data Source 4 inverted signal is disabled for Gate 1
bit 6
G1D4N: Gate 1 Data Source 4 Negated Enable bit
1 = Data Source 4 inverted signal is enabled for Gate 1
0 = Data Source 4 inverted signal is disabled for Gate 1
bit 5
G1D3T: Gate 1 Data Source 3 True Enable bit
1 = Data Source 3 inverted signal is enabled for Gate 1
0 = Data Source 3 inverted signal is disabled for Gate 1
bit 4
G1D3N: Gate 1 Data Source 3 Negated Enable bit
1 = Data Source 3 inverted signal is enabled for Gate 1
0 = Data Source 3 inverted signal is disabled for Gate 1
bit 3
G1D2T: Gate 1 Data Source 2 True Enable bit
1 = Data Source 2 inverted signal is enabled for Gate 1
0 = Data Source 2 inverted signal is disabled for Gate 1
bit 2
G1D2N: Gate 1 Data Source 2 Negated Enable bit
1 = Data Source 2 inverted signal is enabled for Gate 1
0 = Data Source 2 inverted signal is disabled for Gate 1
bit 1
G1D1T: Gate 1 Data Source 1 True Enable bit
1 = Data Source 1 inverted signal is enabled for Gate 1
0 = Data Source 1 inverted signal is disabled for Gate 1
bit 0
G1D1N: Gate 1 Data Source 1 Negated Enable bit
1 = Data Source 1 inverted signal is enabled for Gate 1
0 = Data Source 1 inverted signal is disabled for Gate 1
DS30010089C-page 384
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 23-5:
CLCxGLSH: CLCx GATE LOGIC INPUT SELECT HIGH REGISTER
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
G4D4T
G4D4N
G4D3T
G4D3N
G4D2T
G4D2N
G4D1T
G4D1N
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
G3D4T
G3D4N
G3D3T
G3D3N
G3D2T
G3D2N
G3D1T
G3D1N
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
G4D4T: Gate 4 Data Source 4 True Enable bit
1 = Data Source 4 inverted signal is enabled for Gate 4
0 = Data Source 4 inverted signal is disabled for Gate 4
bit 14
G4D4N: Gate 4 Data Source 4 Negated Enable bit
1 = Data Source 4 inverted signal is enabled for Gate 4
0 = Data Source 4 inverted signal is disabled for Gate 4
bit 13
G4D3T: Gate 4 Data Source 3 True Enable bit
1 = Data Source 3 inverted signal is enabled for Gate 4
0 = Data Source 3 inverted signal is disabled for Gate 4
bit 12
G4D3N: Gate 4 Data Source 3 Negated Enable bit
1 = Data Source 3 inverted signal is enabled for Gate 4
0 = Data Source 3 inverted signal is disabled for Gate 4
bit 11
G4D2T: Gate 4 Data Source 2 True Enable bit
1 = Data Source 2 inverted signal is enabled for Gate 4
0 = Data Source 2 inverted signal is disabled for Gate 4
bit 10
G4D2N: Gate 4 Data Source 2 Negated Enable bit
1 = Data Source 2 inverted signal is enabled for Gate 4
0 = Data Source 2 inverted signal is disabled for Gate 4
bit 9
G4D1T: Gate 4 Data Source 1 True Enable bit
1 = Data Source 1 inverted signal is enabled for Gate 4
0 = Data Source 1 inverted signal is disabled for Gate 4
bit 8
G4D1N: Gate 4 Data Source 1 Negated Enable bit
1 = Data Source 1 inverted signal is enabled for Gate 4
0 = Data Source 1 inverted signal is disabled for Gate 4
bit 7
G3D4T: Gate 3 Data Source 4 True Enable bit
1 = Data Source 4 inverted signal is enabled for Gate 3
0 = Data Source 4 inverted signal is disabled for Gate 3
bit 6
G3D4N: Gate 3 Data Source 4 Negated Enable bit
1 = Data Source 4 inverted signal is enabled for Gate 3
0 = Data Source 4 inverted signal is disabled for Gate 3
bit 5
G3D3T: Gate 3 Data Source 3 True Enable bit
1 = Data Source 3 inverted signal is enabled for Gate 3
0 = Data Source 3 inverted signal is disabled for Gate 3
bit 4
G3D3N: Gate 3 Data Source 3 Negated Enable bit
1 = Data Source 3 inverted signal is enabled for Gate 3
0 = Data Source 3 inverted signal is disabled for Gate 3
 2015 Microchip Technology Inc.
x = Bit is unknown
DS30010089C-page 385
PIC24FJ256GA412/GB412 FAMILY
REGISTER 23-5:
CLCxGLSH: CLCx GATE LOGIC INPUT SELECT HIGH REGISTER (CONTINUED)
bit 3
G3D2T: Gate 3 Data Source 2 True Enable bit
1 = Data Source 2 inverted signal is enabled for Gate 3
0 = Data Source 2 inverted signal is disabled for Gate 3
bit 2
G3D2N: Gate 3 Data Source 2 Negated Enable bit
1 = Data Source 2 inverted signal is enabled for Gate 3
0 = Data Source 2 inverted signal is disabled for Gate 3
bit 1
G3D1T: Gate 3 Data Source 1 True Enable bit
1 = Data Source 1 inverted signal is enabled for Gate 3
0 = Data Source 1 inverted signal is disabled for Gate 3
bit 0
G3D1N: Gate 3 Data Source 1 Negated Enable bit
1 = Data Source 1 inverted signal is enabled for Gate 3
0 = Data Source 1 inverted signal is disabled for Gate 3
DS30010089C-page 386
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
24.0
REAL-TIME CLOCK AND
CALENDAR (RTCC) WITH
TIMESTAMP
Note:
This data sheet summarizes the features of
this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information on the RealTime Clock and Calendar, refer to the
“dsPIC33/PIC24 Family Reference
Manual”, “RTCC with Timestamp”
(DS70005193). The information in this
data sheet supersedes the information in
the FRM.
The RTCC provides the user with a Real-Time Clock
and Calendar (RTCC) function that can be calibrated.
Key features of the RTCC module are:
• Time (Hours, Minutes and Seconds) in 24-Hour
(Military Time) Format
• Calendar (Weekday, Date, Month and Year)
- Year range from 2000 to 2099 with
automatic Leap Year correction
FIGURE 24-1:
• Alarm with Configurable Mask and Repeat
Options
• BCD Format for Compact Firmware
• Optimized for Low-Power Operation
• Multiple Clock Input Options, Including:
- 32.768 kHz crystal
- External Real-Time Clock (RTC)
- 50/60 Hz power line clock
- 31.25 kHz LPRC clock
- System clock, up to 32 MHz
• User Calibration with a Range of 2 ppm when
using 32 kHz Source
• Interrupt on Alarm and Timestamp Events
• Optional Timestamp Capture for Tamper Pin or
Other Events
• User-Configurable Power Control with Dedicated
Output Pin to Periodically Wake External Devices
RTCC HIGH-LEVEL BLOCK DIAGRAM
CPU Clock Domain
RTCC Clock Domain
RTCCON1H
PWRLCLK Pin
SOSC
INTRC
RTCC Prescaler/
Clock Divider
FCY
0.5s
RTCC Timer
RTCCON1L
TIMEH
RTCCON2H
TIMEL
RTCCON2L
DATEH
RTCCON3L
DATEL
RTCSTATL
ALMTIMEH
Alarm and
Repeat Logic
ALMTIMEL
Comparator
with Masks
ALMDATEH
ALMDATEL
TS(A/B)TIMEH
Timestamp Logic
TS(A/B)TIMEL
TS(A/B)DATEH
TS(A/B)DATEL
Interrupt Logic
RTCC Interrupt
RTCC Pin
Pin Control
RTCOE
PWRGT Pin
PWC Logic
PWCOE
 2015 Microchip Technology Inc.
DS30010089C-page 387
PIC24FJ256GA412/GB412 FAMILY
24.1
RTCC Source Clock
The RTCC clock divider block converts the incoming
oscillator source into an accurate 1/2 second clock for
the RTCC timer. The clock divider is optimized to work
with four different oscillator sources:
• System clock, up to 32 MHz
• 32.768 kHz crystal oscillator
• 31 kHz Low-Power RC Oscillator (LPRC)
• External 50 Hz or 60 Hz power line frequency
An asynchronous prescaler, PS<1:0> (RTCCON2L<5:4>),
is provided that allows the RTCC to work with higher
speed clock sources, such as the system clock. Divide
ratios of 1:16, 1:64 or 1:256 may be selected, allowing
sources up to 32 MHz to clock the RTCC.
24.1.1
SELECTING RTCC CLOCK SOURCE
The clock source for the RTCC module can be selected
using the CLKSEL<1:0> bits in the RTCCON2L
register. When the bits are set to ‘00’, the Secondary
Oscillator (SOSC) is used as the reference clock and
when the bits are ‘01’, LPRC is used as the reference
clock. When CLKSEL<1:0> = 10, the external power
line (50 Hz and 60 Hz) is used as the clock source.
When CLKSEL<1:0> = 11, the system clock is used as
the clock source.
24.1.2
COARSE FREQUENCY DIVISION
The clock divider block has a 16-bit counter used to
divide the input clock frequency. The divide ratio is set
by the DIV<15:0> register bits (RTCCON2H<15:0>).
The DIV<15:0> bits should be programmed with a
value to produce a nominal 1/2 second clock divider
count period.
24.1.3
FINE FREQUENCY DIVISION
The fine frequency division is set using the FDIV<4:0>
(RTCCON2L<15:11>) bits. Increasing the FDIVx value
will lengthen the overall clock divider period.
EQUATION 24-1:
RTCC CLOCK DIVIDER
OUTPUT FREQUENCY
FIN
FOUT =
2 • (PS<1:0> Prescaler) • (DIV<15:0> + 1) +
(FDIV<4:0>
32 )
The DIV<15:0> value is the integer part of this calculation:
DIV<15:0> =
(2 • (PS<1:0>F Prescaler)) – 1
IN
The FDIV<4:0> value is the fractional part of the
DIV<15:0> calculation, multiplied by 32.
24.1.4
CLOCK SOURCE CALIBRATION
A crystal oscillator that is connected to the RTCC may
be calibrated to provide an accurate 1-second clock in
two ways. First, coarse frequency adjustment is performed by adjusting the value written to the DIV<15:0>
bits. Secondly, a 5-bit value can be written to the
FDIV<4:0> control bits to perform a fine clock division.
The DIVx and FDIVx values can be concatenated and
considered as a 21-bit prescaler value. If the oscillator
source is slightly faster than ideal, the FDIV<4:0> value
can be increased to make a small decrease in the RTC
frequency. The value of DIV<15:0> should be
increased to make larger decreases in the RTC
frequency. If the oscillator source is slower than ideal,
FDIV<4:0> may be decreased for small calibration
changes and DIV<15:0> may need to be decreased to
make larger calibration changes.
Before calibration, the user must determine the error of
the crystal. This should be done using another timer
resource on the device or an external timing reference.
It is up to the user to include in the error value the initial
error of the crystal, drift due to temperature and drift
due to crystal aging.
If FDIV<4:0> = 00000, the fine frequency division
circuit is effectively disabled. Otherwise, it will optionally remove a clock pulse from the input of the clock
divider every 1/2 second. This functionality will allow
the user to remove up to 31 pulses over a fixed period
of 16 seconds, depending on the value of FDIVx.
The value for DIV<15:0> is calculated as shown in
Equation 24-1. The fractional remainder of the
DIV<15:0> calculation result can be used to calculate
the value for FDIV<4:0>.
DS30010089C-page 388
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
24.2
Alarm
After each alarm is issued, the value of the ALMRPTx
bits is decremented by one. Once the value has reached
00h, the alarm will be issued one last time, after which,
the ALRMEN bit will be cleared automatically and the
alarm will turn off.
The RTCC alarm includes these features:
• Configurable from half second to one year
• One-time alarm and repeat alarm options
available
24.2.1
Indefinite repetition of the alarm can occur if the
CHIME bit = 1. Instead of the alarm being disabled
when the value of the ALMRPTx bits reaches 00h, it
rolls over to FFh and continues counting indefinitely
while CHIME is set.
CONFIGURING THE ALARM
The alarm feature is enabled using the ALRMEN bit.
This bit is cleared when an alarm is issued. Writes to
ALRMVAL should only take place when ALRMEN = 0.
24.2.2
As shown in Figure 24-2, the interval selection of the
alarm is configured through the AMASK<3:0> bits
(RTCCON1H<11:8>). These bits determine which, and
how many, digits of the alarm must match the clock
value for the alarm to occur.
ALARM INTERRUPT
At every alarm event, an interrupt is generated. This
output is completely synchronous to the RTCC clock
and can be used as a trigger clock to other peripherals.
Note:
The alarm can also be configured to repeat based on a
preconfigured interval. The amount of times this
occurs, once the alarm is enabled, is stored in the
ALMRPT<7:0> bits (RTCCON1H<7:0>). When the
value of the ALMRPTx bits equals 00h and the CHIME
bit (RTCCON1H<14>) is cleared, the repeat function is
disabled and only a single alarm will occur. The alarm
can be repeated, up to 255 times, by loading
ALMRPT<7:0> with FFh.
FIGURE 24-2:
Changing any of the register bits, other
than the RTCOE bit, the ALMRPT<7:0>
bits and the CHIME bit, while the alarm is
enabled (ALRMEN = 1), can result in a
false alarm event leading to a false alarm
interrupt. To avoid a false alarm event, the
timer and alarm values should only be
changed while the alarm is disabled
(ALRMEN = 0).
ALARM MASK SETTINGS
Alarm Mask Setting
(AMASK<3:0>)
Day of
the
Week
Month
Day
Hours
Minutes
Seconds
0000 - Every half second
0001 - Every second
0010 - Every 10 seconds
s
0011 - Every minute
s
s
m
s
s
m
m
s
s
0100 - Every 10 minutes
0101 - Every hour
0110 - Every day
0111 - Every week
d
1000 - Every month
1001 - Every year(1)
Note 1:
m
m
h
h
m
m
s
s
h
h
m
m
s
s
d
d
h
h
m
m
s
s
d
d
h
h
m
m
s
s
Annually, except when configured for February 29.
 2015 Microchip Technology Inc.
DS30010089C-page 389
PIC24FJ256GA412/GB412 FAMILY
24.3
Power Control
The RTCC includes a power control feature that allows
the device to periodically wake-up an external device,
wait for the device to be stable before sampling
wake-up events from that device and then shut down
the external device. This can be done completely
autonomously by the RTCC, without the need to wake
from the current lower power mode.
To use this feature:
1.
2.
3.
Enable the RTCC (RTCEN = 1).
Set the PWCEN bit (RTCCON1L<10>).
Configure the RTCC pin to drive the PWC control
signal (RTCOE = 1 and OUTSEL<2:0> = 011).
The polarity of the PWC control signal is selected by
the PWCPOL bit (RTCCON1L<9>). An active-low or
active-high signal may be used with the appropriate
external switch to turn on or off the power to one or
more external devices. The active-low setting may also
be used in conjunction with an open-drain setting on
the RTCC pin, in order to drive the ground pin(s) of the
external device directly (with the appropriate external
VDD pull-up device), without the need for external
switches. Finally, the CHIME bit should be set to enable
the PWC periodicity.
Once the RTCC and PWC are enabled and running, the
PWC logic will generate a control output and a sample
gate output. The control output is driven out on the
RTCC pin (when RTCOE = 1 and OUTSEL<2:0> = 011)
and is used to power-up or power-down the device, as
described above.
Once the control output is asserted, the Stability Window begins, in which the external device is given
enough time to power-up and provide a stable output.
Once the output is stable, the RTCC provides a sample
gate during the Sample Window. The use of this
sample gate depends on the external device being
used, but typically, it is used to mask out one or more
wake-up signals from the external device.
Finally, both the Stability and the Sample Windows
close after the expiration of the Sample Window, and
the external device is powered down.
24.3.1
POWER CONTROL CLOCK
SOURCE
The Stability and Sample Windows are controlled by the
PWCSAMP<7:0> and PWCSTAB<7:0> bits field in the
RTCCON3L register (RTCCON3L<15:8> and <7:0>,
respectively). As both the Stability and Sample
Windows are defined in terms of the RTCC clock, their
absolute values vary by the value of the PWC clock
base period. The 8-bit magnitude of PWCSTABx and
PWCSAMPx allows for a window size of 0 to 255 clock
periods.
DS30010089C-page 390
The period of the PWC clock can also be adjusted with
a 1:1, 1:16, 1:64 or 1:256 prescaler, determined by the
PWCPS<1:0> bits (RTCCON2L<7:6>).
In addition, certain values for the PWCSTABx and
PWCSAMPx fields have specific control meanings in
determining power control operations. If either bit field
is 00h, the corresponding window is inactive. In addition, if the PWCSTABx field is FFh, the Stability Window
remains active continuously, even if power control is
disabled.
24.4
Event Timestamping
The RTCC includes two sets of Timestamp registers
that may be used for the capture of Time and Date register values when an external input signal is received.
The RTCC triggers the timestamps for two events:
• For Timestamp A, a falling edge on the TMPR pin
• For Timestamp B, when the devices transition
from VDD to VBAT power
24.4.1
TIMESTAMP OPERATION
The event input is enabled for timestamping using the
TSAEN bit (RTCCON1L<0>). When the timestamp
event occurs, the present time and date values are
stored in the TSATIMEL/H and TSADATEL/H registers,
the TSAEVT status bit (RTCSTATL<3>) becomes set
and an RTCC interrupt occurs. A new timestamp
capture event cannot occur until the user clears the
TSAEVT status bit.
Note 1: The TSATIMEL/H and TSADATEL/H
register pairs can be used for data
storage when TSAEN = 0. The values of
TSATIMEL/H and TSADATEL/H will be
maintained throughout all types of
non-power Resets (MCLR, WDT, etc).
24.4.2
MANUAL TIMESTAMP
The current time and date may be captured in the
TSATIMEL/H and TSADATEL/H registers by writing a
‘1’ to the TSAEVT bit location while the timestamp functionality is enabled (TSAEN = 1). This write will not set
the TSAEVT bit, but it will initiate a timestamp capture.
The TSAEVT bit will be set when the capture operation
is complete. The user must poll the TSAEVT bit to
determine when the capture operation is complete.
After the Timestamp registers have been read, the
TSAEVT bit should be cleared to allow further
hardware or software timestamp capture events.
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
24.5
RTCC Module Registers
The RTCC module registers are organized into three
categories:
• RTCC Control and Status registers
• Time/Alarm/Timestamp Value registers
• Date/Alarm/Timestamp registers
All Date and Time registers are directly mapped to
memory and are individually addressable. In addition,
the Date and Time registers for the RTCC timer, the
alarm and the timestamps are identical in format.
24.5.1
WRITE LOCK
In order to perform a write to any of the RTCC Timer
registers, the WRLOCK bit (RTCCON1L<11>) must be
cleared (see Example 24-1).
Note:
To avoid accidental writes to the timer, it is
recommended that the WRLOCK bit be
set at any other time. For the WRLOCK bit
to be cleared, there is only one instruction
cycle time window allowed between the
55h/AA sequence and the setting of
WRLOCK; therefore, it is recommended
that code follow the procedure in
Example 24-1.
 2015 Microchip Technology Inc.
EXAMPLE 24-1:
SETTING THE WRLOCK BIT
void RTCC_Unlock(void) {
asm volatile ("DISI #6");
asm volatile ("MOV #NVMKEY, W1");
asm volatile ("MOV #0x55, W2");
asm volatile ("MOV W2, [W1]");
asm volatile ("MOV #0xAA, W3");
asm volatile ("MOV W3, [W1]");
asm volatile ("BCLR RTCCON1L, #WRLOCK");
}
void RTCC_Lock(void) {
asm volatile ("DISI #6");
asm volatile ("MOV #NVMKEY, W1");
asm volatile ("MOV #0x55, W2");
asm volatile ("MOV W2, [W1]");
asm volatile ("MOV #0xAA, W3");
asm volatile ("MOV W3, [W1]");
asm volatile ("BSET RTCCON1L, #WRLOCK");
}
DS30010089C-page 391
PIC24FJ256GA412/GB412 FAMILY
24.5.2
RTCC CONTROL AND STATUS
REGISTERS
REGISTER 24-1:
RTCCON1L: RTCC CONTROL REGISTER 1 (LOW)
R/W-0
U-0
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
RTCEN
—
—
—
WRLOCK
PWCEN
PWCPOL
PWCPOE
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
U-0
U-0
R/W-0
R/W-0
RTCOE
OUTSEL2
OUTSEL1
OUTSEL0
—
—
TSBEN
TSAEN
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
RTCEN: RTCC Enable bit
1 = RTCC is enabled and counts from selected clock source
0 = RTCC is not enabled
bit 14-12
Unimplemented: Read as ‘0’
bit 11
WRLOCK: RTCC Register Write Lock bit
1 = RTCC registers are locked
0 = RTCC registers may be written by the user
bit 10
PWCEN: Power Control Enable bit
1 = Power control is enabled
0 = Power control is disabled
bit 9
PWCPOL: Power Control Polarity bit
1 = Power control output is active-high
0 = Power control output is active-low
bit 8
PWCPOE: Power Control Output Enable bit
1 = Power control output pin is enabled
0 = Power control output pin is disabled
bit 7
RTCOE: RTCC Output Enable bit
1 = RTCC output is enabled
0 = RTCC output is disabled
bit 6-4
OUTSEL<2:0>: RTCC Output Signal Selection bits
11x = Unused
101 = Unused
100 = Timestamp A event
011 = Power control
010 = RTCC input clock
001 = Second clock
000 = Alarm event
bit 3-2
Unimplemented: Read as ‘0’
bit 1
TSBEN: Timestamp Source B Enable bit
1 = Timestamp Source B signal generates a timestamp event
0 = Timestamp Source B is disabled
bit 0
TSAEN: Timestamp Source A Enable bit
1 = Timestamp Source A event is generated when a low pulse is detected on the TMPR pin
0 = Timestamp Source A is disabled
DS30010089C-page 392
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 24-2:
RTCCON1H: RTCC CONTROL REGISTER 1 (HIGH)
R/W-0
R/W-0
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
ALRMEN
CHIME
—
—
AMASK3
AMASK2
AMASK1
AMASK0
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
ALMRPT7
ALMRPT6
ALMRPT5
ALMRPT4
ALMRPT3
ALMRPT2
ALMRPT1
ALMRPT0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
ALRMEN: Alarm Enable bit
1 = Alarm is enabled (cleared automatically after an alarm event whenever ALMRPT<7:0> = 00h and
CHIME = 0)
0 = Alarm is disabled
bit 14
CHIME: Chime Enable bit
1 = Chime is enabled; ALMRPT<7:0> bits roll over from 00h to FFh
0 = Chime is disabled; ALMRPT<7:0> bits stop once they reach 00h
bit 13-12
Unimplemented: Read as ‘0’
bit 11-8
AMASK<3:0>: Alarm Mask Configuration bits
11xx = Reserved, do not use
101x = Reserved, do not use
1001 = Once a year (or once every 4 years when configured for February 29th)
1000 = Once a month
0111 = Once a week
0110 = Once a day
0101 = Every hour
0100 = Every 10 minutes
0011 = Every minute
0010 = Every 10 seconds
0001 = Every second
0000 = Every half second
bit 7-0
ALMRPT<7:0>: Alarm Repeat Counter Value bits
11111111 = Alarm will repeat 255 more times
11111110 = Alarm will repeat 254 more times
•••
00000010 = Alarm will repeat 2 more times
00000001 = Alarm will repeat 1 more time
00000000 = Alarm will not repeat
 2015 Microchip Technology Inc.
DS30010089C-page 393
PIC24FJ256GA412/GB412 FAMILY
REGISTER 24-3:
RTCCON2L: RTCC CONTROL REGISTER 2 (LOW)
R/W-1
R/W-0
R/W-0
R/W-0
R/W-0
U-0
U-0
U-0
FDIV4
FDIV3
FDIV2
FDIV1
FDIV0
—
—
—
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
U-0
U-0
R/W-0
R/W-0
PWCPS1
PWCPS0
PS1
PS0
—
—
CLKSEL1
CLKSEL0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-11
FDIV<4:0>: Fractional Clock Divide bits
11111 = Clock period increases by 31 RTCC input clock cycles every 16 seconds
11101 = Clock period increases by 30 RTCC input clock cycles every 16 seconds
•••
00010 = Clock period increases by 2 RTCC input clock cycles every 16 seconds
00001 = Clock period increases by 1 RTCC input clock cycle every 16 seconds
00000 = No fractional clock division
bit 10-8
Unimplemented: Read as ‘0’
bit 7-6
PWCPS<1:0>: Power Control Prescale Select bits
11 = 1:256
10 = 1:64
01 = 1:16
00 = 1:1
bit 5-4
PS<1:0>: Prescale Select bits
11 = 1:256
10 = 1:64
01 = 1:16
00 = 1:1
bit 3-2
Unimplemented: Read as ‘0’
bit 1-0
CLKSEL<1:0>: Clock Select bits
11 = Peripheral clock (FCY)
10 = PWRLCLK input pin
01 = LPRC
00 = SOSC
DS30010089C-page 394
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 24-4:
R/W-0
RTCCON2H: RTCC CONTROL REGISTER 2 (HIGH)(1)
R/W-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
DIV<15:8>
bit 15
bit 8
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
DIV<7:0>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-0
Note 1:
x = Bit is unknown
DIV<15:0>: Clock Divide bits
Sets the period of the clock divider counter; value should cause a nominal 1/2 second underflow.
A write to this register is only allowed when WRLOCK = 1.
REGISTER 24-5:
RTCCON3L: RTCC CONTROL REGISTER 3 (LOW)(1)
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
PWCSAMP7
PWCSAMP6
PWCSAMP5
PWCSAMP4
PWCSAMP3
R/W-0
R/W-0
R/W-0
PWCSAMP2 PWCSAMP1 PWCSAMP0
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
PWCSTAB7
PWCSTAB6
PWCSTAB5
PWCSTAB4
PWCSTAB3
PWCSTAB2
R/W-0
R/W-0
PWCSTAB1 PWCSTAB0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-8
PWCSAMP<7:0>: Power Control Sample Time Window bits
11111111 = Sample input is always allowed (not gated)
11111110 = Sample Time Window is 254 TPWC
•••
00000010 = Sample Time Window is 2 TPWC
00000001 = Sample Time Window is 1 TPWC
00000000 = Sample input is always gated
bit 7-0
PWCSTAB<7:0>: Power Control Stability Time bits
11111111 = Stability Time Window is 255 TPWC
11111110 = Stability Time Window is 254 TPWC
•••
00000010 = Stability Time Window is 2 TPWC
00000001 = Stability Time Window is 1 TPWC
00000000 = No Stability Time Window
Note 1:
x = Bit is unknown
The Sample Window always starts when the Stability Window timer expires, except when its initial value is 00h.
 2015 Microchip Technology Inc.
DS30010089C-page 395
PIC24FJ256GA412/GB412 FAMILY
REGISTER 24-6:
RTCSTATL: RTCC STATUS REGISTER (LOW)
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
U-0
U-0
R/C-0, HSC
R/W-0, HSC
R/W-0, HSC
R-0, HSC
R-0, HSC
R-0, HSC
—
—
ALMEVT
TSBEVT(1)
TSAEVT(1)
SYNC
ALMSYNC
HALFSEC(2)
bit 7
bit 0
Legend:
C = Clearable bit
HSC = Hardware Settable/Clearable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-6
Unimplemented: Read as ‘0’
bit 5
ALMEVT: Alarm Event bit
1 = An alarm event has occurred
0 = An alarm event has not occurred
bit 4
TSBEVT: Timestamp B Event bit(1)
1 = A Timestamp B event has occurred
0 = A Timestamp B event has not occurred
bit 3
TSAEVT: Timestamp A Event bit(1)
1 = A Timestamp A event has occurred
0 = A Timestamp A event has not occurred
bit 2
SYNC: Synchronization Status bit
1 = Time registers may change during software read
0 = Time registers may be read safely
bit 1
ALMSYNC: Alarm Synchronization Status bit
1 = Alarm registers (ALMTIME, ALMDATE) and AMASKx bits should not be modified and Alarm Control
registers (ALRMEN, ALMRPT<7:0>) may change during software read
0 = Alarm registers and Alarm Control registers may be written/modified safely
bit 0
HALFSEC: Half Second Status bit(2)
1 = Second half of 1-second period
0 = First half of 1-second period
Note 1:
2:
User software may write a ‘1’ to this location to initiate a Timestamp A event; timestamp capture is not
valid until TSAEVT reads as ‘1’.
This bit is read-only; it is cleared to ‘0’ on a write to the SECONE<3:0> bits in Register 24-7.
DS30010089C-page 396
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
24.5.3
TIME/ALARM/TIMESTAMP VALUE
REGISTERS
REGISTER 24-7:
TIMEL/ALMTIMEL/TSATIMEL/TSBTIMEL: TIME REGISTER (LOW)
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
SECTEN2
SECTEN1
SECTEN0
SECONE3
SECONE2
SECONE1
SECONE0
bit 15
bit 8
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
Unimplemented: Read as ‘0’
bit 14-12
SECTEN<2:0>: Binary Coded Decimal Value of Seconds ‘10’ Digit bits
Contains a value from 0 to 5.
bit 11-8
SECONE<3:0>: Binary Coded Decimal Value of Seconds ‘1’ Digit bits
Contains a value from 0 to 9.
bit 7-0
Unimplemented: Read as ‘0’
REGISTER 24-8:
TIMEH/ALMTIMEH/TSATIMEH/TSBTIMEH: TIME REGISTER (HIGH)
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
HRTEN1
HRTEN0
HRONE3
HRONE2
HRONE1
HRONE0
bit 15
bit 8
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
MINTEN2
MINTEN1
MINTEN0
MINONE3
MINONE2
MINONE1
MINONE0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-14
Unimplemented: Read as ‘0’
bit 13-12
HRTEN<1:0>: Binary Coded Decimal Value of Hours ‘10’ Digit bits
Contains a value from 0 to 2.
bit 11-8
HRONE<3:0>: Binary Coded Decimal Value of Hours ‘1’ Digit bits
Contains a value from 0 to 9.
bit 7
Unimplemented: Read as ‘0’
bit 6-4
MINTEN<2:0>: Binary Coded Decimal Value of Minutes ‘10’ Digit bits
Contains a value from 0 to 5.
bit 3-0
MINONE<3:0>: Binary Coded Decimal Value of Minutes ‘1’ Digit bits
Contains a value from 0 to 9.
 2015 Microchip Technology Inc.
x = Bit is unknown
DS30010089C-page 397
PIC24FJ256GA412/GB412 FAMILY
24.5.4
DATE/ALARM/TIMESTAMP VALUE
REGISTERS
REGISTER 24-9:
DATEL/ALMDATEL/TSADATEL/TSBDATEL: DATE REGISTER (LOW)
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-1
—
—
DAYTEN1
DAYTEN0
DAYONE3
DAYONE2
DAYONE1
DAYONE0
bit 15
bit 8
U-0
U-0
U-0
U-0
U-0
R/W-1
R/W-1
R/W-0
—
—
—
—
—
WDAY2
WDAY1
WDAY0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
Unimplemented: Read as ‘0’
bit 13-12
DAYTEN<1:0>: Binary Coded Decimal Value of Days ‘10’ Digit bits
Contains a value from 0 to 3.
bit 11-8
DAYONE<3:0>: Binary Coded Decimal Value of Days ‘1’ Digit bits
Contains a value from 0 to 9.
bit 7-3
Unimplemented: Read as ‘0’
bit 2-0
WDAY<2:0>: Binary Coded Decimal Value of Weekdays ‘1’ Digit bits
Contains a value from 0 to 6.
REGISTER 24-10: DATEH/ALMDATEH/TSADATEH/TSBDATEH: DATE REGISTER (HIGH)
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
YRTEN3
YRTEN2
YRTEN1
YRTEN0
YRONE3
YRONE2
YRONE1
YRONE0
bit 15
bit 8
U-0
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-1
—
—
—
MTHTEN
MTHONE3
MTHONE2
MTHONE1
MTHONE0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-12
YRTEN<3:0>: Binary Coded Decimal Value of Years ‘10’ Digit bits
bit 11-8
YRONE<3:0>: Binary Coded Decimal Value of Years ‘1’ Digit bits
bit 7-5
Unimplemented: Read as ‘0’
bit 4
MTHTEN: Binary Coded Decimal Value of Months ‘10’ Digit bit
Contains a value from 0 to 1.
bit 3-0
MTHONE<3:0>: Binary Coded Decimal Value of Months ‘1’ Digit bits
Contains a value from 0 to 9.
DS30010089C-page 398
x = Bit is unknown
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
25.0
Note:
CRYPTOGRAPHIC ENGINE
This data sheet summarizes the features
of the PIC24FJ256GA412/GB412 family
of devices. It is not intended to be a comprehensive reference source. To complement
the information in this data sheet, refer to
the “dsPIC33/PIC24 Family Reference
Manual”,
“Cryptographic
Engine”
(DS70005133) which is available from the
Microchip web site (www.microchip.com).
The Cryptographic Engine provides a new set of data
security options. Using its own free-standing state
machines, the engine can independently perform NIS
standard encryption and decryption of data independently of the CPU. This eliminates the concerns of
excessive CPU or program memory overhead that
encryption and decryption would otherwise require,
while enhancing the application’s security.
The primary features of the Cryptographic Engine are:
• Memory-Mapped, 128-Bit and 256-Bit Memory
Spaces for Encryption/Decryption Data
• Multiple Options for Key Storage, Selection and
Management
• Support for Internal Context Saving
• Session Key Encryption and Loading
FIGURE 25-1:
• Half-Duplex Operation
• DES and Triple DES (3DES) Encryption and
Decryption (64-bit block size):
- Supports 64-bit keys and 2-key or 3-key
Triple DES
• AES Encryption and Decryption (128-bit block size):
- Supports key sizes of 128, 192 or 256 bits
• Supports ECB, CBC, CFB, OFB and CTR Modes
for Both DES and AES Standards
• Programmatically Secure Key Storage:
- 512-byte OTP array for key storage, not
readable from other memory spaces
- 32-bit Configuration Page
- Independent, 512-byte Key RAM for volatile
key storage
- Simple in-module programming interface
- Supports Key Encryption Key (KEK)
• Support for True Random Number Generation
(TRNG) and Pseudorandom Number Generation
(PRNG), NIST SP800-90 Compliant
• Hardware Anti-Tamper Feature for Additional
Data Security
A simplified block diagram of the Cryptographic Engine
is shown in Figure 25-1.
CRYPTOGRAPHIC ENGINE BLOCK DIAGRAM
CRYCONH
CRYCONL
CRYSTAT
Cryptographic and
OTP Control
CRYOTP
CFGPAGE
OTP
Key Store and
Configuration
Key RAM
Mapped to
SFR Space
CRYKEY
256 Bits
CRYTXTA
128 Bits
CRYTXTB
128 Bits
OTP
Programming
Key
Management
TRN
Generation
DES
Engine
AES
Engine
CRYTXTC
128 Bits
 2015 Microchip Technology Inc.
DS30010089C-page 399
PIC24FJ256GA412/GB412 FAMILY
25.1
Data Register Spaces
There are four register spaces used for cryptographic
data and key storage:
•
•
•
•
CRYTXTA
CRYTXTB
CRYTXTC
CRYKEY
Although mapped into the SFR space, all of these Data
Spaces are actually implemented as 128-bit or 256-bit
wide arrays, rather than groups of 16-bit wide Data registers. Reads and writes to and from these arrays are
automatically handled as if they were any other register
in the SFR space.
CRYTXTA through CRYTXTC are 128-bit wide spaces;
they are used for writing data to, and reading from, the
Cryptographic Engine. Additionally, they are also used
for storing intermediate results of the encryption/
decryption operation. None of these registers may be
written to when the module is performing an operation
(CRYGO = 1).
CRYTXTA and CRYTXTB normally serve as inputs to
the encryption/decryption process.
CRYTXTA usually contains the initial plaintext or ciphertext to be encrypted or decrypted. Depending on the
mode of operation, CRYTXTB may contain the ciphertext
output or intermediate cipher data. It may also function as
a programmable length counter in certain operations.
CRYTXTC is primarily used to store the final output of
an encryption/decryption operation. It is also used as
the input register for data to be programmed to the
Secure OTP Array.
CRYKEY is a 256-bit wide space, used to store cryptographic keys for the selected operation; it is writable
from both the SFR space and the Secure OTP Array.
Although mapped into the SFR space, it is a write-only
memory area; any data placed here, regardless of its
source, cannot be read back by any run-time operations.
This feature helps to ensure the security of any key data.
25.2
Modes of Operation
The Cryptographic Engine supports the following
modes of operation, determined by the OPMOD<3:0>
(CRYCONL<7:4>) bits:
•
•
•
•
•
•
•
Block Encryption
Block Decryption
AES Decryption Key Expansion
Random Number Generation
Session Key Generation
Session Key Encryption
Session Key Loading
The OPMOD<3:0> bits may be changed while CRYON is
set. They should only be changed when a cryptographic
operation is not being done (CRYGO = 0).
Once the encryption operation, and the appropriate and
valid key configuration is selected, the operation is performed by setting the CRYGO bit. This bit is automatically
cleared by hardware when the operation is complete.
The CRYGO bit can also be manually cleared by software; this causes any operation in progress to terminate
immediately. Clearing this bit in software also sets the
CRYABRT bit (CRYSTAT<5>).
For most operations, CRYGO can only be set when an
OTP operation is not being performed and there are no
other error conditions. CRYREAD, CRYWR, CRYABRT,
ROLLOVR, MODFAIL and KEYFAIL must all be ‘0’.
Setting CRYWR and CRYGO simultaneously will not
initiate an OTP programming operation or any other
operation. Setting CRYGO when the module is
disabled (CRYON = 0) also has no effect.
25.3
Enabling the Engine
The Cryptographic Engine is enabled by setting the
CRYON bit. Clearing this bit disables both the DES and
AES engines, as well as causing the following register
bits to be held in Reset:
• CRYGO (CRYCONL<8>)
• TXTABSY (CRYSTAT<6>)
• CRYWR (CRYOTP<0>)
All other register bits and registers may be read and
written while CRYON = 0.
DS30010089C-page 400
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
25.4
Encrypting Data
1.
2.
If not already set, set the CRYON bit.
Configure the CPHRSEL, CPHRMODx,
KEYMODx and KEYSRCx bits as desired to
select the proper mode and key length.
3. Set OPMOD<3:0> to ‘0000’.
4. If a software key is being used, write it to the
CRYKEY register. It is only necessary to write
the lowest n bits of CRYKEY for a key length of
n, as all unused CRYKEY bits are ignored.
5. Read the KEYFAIL bit. If this bit is ‘1’, an illegal
configuration has been selected and the encrypt
operation will NOT be performed.
6. Write the data to be encrypted to the appropriate
CRYTXT register. For a single DES encrypt
operation, it is only necessary to write the lowest
64 bits. However, for data less than the block
size (64 bits for DES, 128 bits for AES), it is the
responsibility of the software to properly pad the
upper bits within the block.
7. Set the CRYGO bit.
8. In ECB and CBC modes, set the FREEIE bit
(CRYCONL<10>) to enable the optional
CRYTXTA interrupt to indicate when the next
plaintext block can be loaded.
9. Poll the CRYGO bit until it is cleared or wait for
the CRYDNIF module interrupt (DONEIE must
be set). If other Cryptographic Engine interrupts
are enabled, it will be necessary to poll the
CRYGO bit to verify the interrupt source.
10. Read the encrypted block from the appropriate
CRYTXT register.
11. Repeat Steps 5 through 8 to encrypt further
blocks in the message with the same key.
25.5
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
 2015 Microchip Technology Inc.
Decrypting Data
If not already set, set the CRYON bit.
Configure the CPHRSEL, CPHRMODx,
KEYMODx and KEYSRCx bits as desired to
select the proper mode and key length.
Set OPMOD<3:0> to ‘0001’.
If a software key is being used, write the
CRYKEY register. It is only necessary to write
the lowest n bits of CRYKEY for a key length of
n, as all unused CRYKEY bits are ignored.
If an AES-ECB or AES-CBC mode decryption is
being performed, you must first perform an AES
decryption key expansion operation.
Read the KEYFAIL status bit. If this bit is ‘1’, an
illegal configuration has been selected and the
encrypt operation will not be performed.
Write the data to be decrypted into the appropriate
Text/Data register. For a DES decrypt operation, it
is only necessary to write the lowest 64 bits of
CRYTXTB.
Set the CRYGO bit.
If this is the first decrypt operation after a Reset,
or if a key storage program operation was performed after the last decrypt operation, or if the
KEYMODx or KEYSRCx fields are changed, the
engine will perform a new key expansion operation. This will result in extra clock cycles for the
decrypt operation, but will otherwise be
transparent to the application (i.e., the CRYGO
bit will be cleared only after the key expansion
and the decrypt operation have completed).
In ECB and CBC modes, set the FREEIE bit
(CRYCONL<10>) to enable the optional
CRYTXTA interrupt to indicate when the next
plaintext block can be loaded.
Poll the CRYGO bit until it is cleared or wait for
the CRYDNIF module interrupt (DONEIE must
be set). If other Cryptographic Engine interrupts
are enabled, it will be necessary to poll the
CRYGO bit to verify the interrupt source.
Read the decrypted block out of the appropriate
Text/Data register.
Repeat Steps 6 through 10 to encrypt further
blocks in the message with the same key.
DS30010089C-page 401
PIC24FJ256GA412/GB412 FAMILY
25.6
Note:
1.
2.
Encrypting a Session Key
Note:
ECB and CBC modes are restricted to
128-bit session keys only.
If not already set, set the CRYON bit.
If not already programmed, program the
SKEYEN bit to ‘1’.
Note:
25.7
1.
2.
3.
4.
Set OPMOD<3:0> to ‘1110’.
Configure the CPHRSEL, CPHRMOD<2:0> and
KEYMOD<1:0> register bit fields as desired, set
SKEYSEL to ‘0’.
5. Read the KEYFAIL status bit. If this bit is ‘1’, an
illegal configuration has been selected and the
encrypt operation will not be performed.
6. Write the software generated session key into
the CRYKEY register or generate a random key
into the CRYKEY register. It is only necessary to
write the lowest n bits of CRYKEY for a key
length of n, as all unused key bits are ignored.
7. Set the CRYGO bit. Poll the bit until it is cleared
by hardware; alternatively, set the DONEIE bit
(CRYCONL<11>) to generate an interrupt when
the encryption is done.
8. Read the encrypted session key out of the
appropriate CRYTXT register.
9. For total key lengths of more than 128 bits, set
SKEYSEL to ‘1’ and repeat Steps 6 and 7.
10. Set KEYSRC<3:0> to ‘0000’ to use the session
key to encrypt data.
DS30010089C-page 402
3.
4.
5.
6.
7.
8.
9.
ECB and CBC modes are restricted to
128-bit session keys only.
If not already set, set the CRYON bit.
If not already programmed, program the
SKEYEN bit to ‘1’.
Note:
Setting SKEYEN permanently makes
Key #1 available as a Key Encryption Key
only. It cannot be used for other encryption
or decryption operations after that.
Receiving a Session Key
Setting SKEYEN permanently makes
Key #1 available as a Key Encryption Key
only. It cannot be used for other encryption or decryption operations after that. It
also permanently disables the ability of
software to decrypt the session key into
the CRYTXTA register, thereby breaking
programmatic security (i.e., software can
read the unencrypted key).
Set OPMOD<3:0> to ‘1111’.
Configure the CPHRSEL, CPHRMOD<2:0> and
KEYMOD<1:0> register bit fields as desired; set
SKEYSEL to ‘0’.
Read the KEYFAIL status bit. If this bit is ‘1’, an
illegal configuration has been selected and the
encrypt operation will NOT be performed.
Write the encrypted session key received into
the appropriate CRYTXT register.
Set the CRYGO bit. Poll the bit until it is cleared
by hardware; alternatively, set the DONEIE bit
(CRYCONL<11>) to generate an interrupt when
the process is done.
For total key lengths of more than 128 bits, set
SKEYSEL to ‘1’ and repeat Steps 6 and 7.
Set KEYSRC<3:0> to ‘0000’ to use the newly
generated session key to encrypt and decrypt
data.
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
25.8
Generating a Pseudorandom
Number (PRN)
For operations that require a Pseudorandom Number
(PRN), the method outlined in NIST SP800-90 can be
adapted for efficient use with the Cryptographic
Engine. This method uses the AES algorithm in CTR
mode to create PRNs with minimal CPU overhead.
PRNs generated in this manner can be used for cryptographic purposes or any other purpose that the host
application may require.
The random numbers used as initial seeds can be
taken from any source convenient to the user’s application. If possible, a non-deterministic random number
source should be used.
Note:
PRN generation is not available when
software keys are disabled (SWKYDIS = 1).
To perform the initial reseeding operation, and subsequent reseedings after the reseeding interval has
expired:
1.
2.
Store a random number (128 bits) in CRYTXTA.
For the initial generation ONLY, use a key value
of 0h (128 bits) and a counter value of 0h.
3. Configure the engine for AES encryption, CTR
mode (OPMOD<3:0> = 0000, CPHRSEL = 1,
CPHRMOD<2:0> = 100).
4. Perform an encrypt operation by setting
CRYGO.
5. Move the results in CRYTXTC to RAM. This is
the New Key Value (NEW_KEY).
6. Store another random number (128 bits) in
CRYTXTA.
7. Configure the module for encryption as in Step 3.
8. Perform an encrypt operation by setting
CRYGO.
9. Store this value in RAM. This is the New Counter
Value (NEW_CTR).
10. For subsequent reseeding operations, use
NEW_KEY and NEW_CTR for the starting key and
counter values.
 2015 Microchip Technology Inc.
To generate the Pseudorandom Number:
1.
2.
3.
4.
Load NEW_KEY value from RAM into CRYKEY.
Load NEW_CTR value from RAM into CRYTXTB.
Load CRYTXTA with 0h (128 bits).
Configure the engine for AES encryption, CTR
mode (OPMOD<3:0> = 0000, CPHRSEL = 1,
CPHRMOD<2:0> = 100).
5. Perform an encrypt operation by setting CRYGO.
6. Copy the generated PRN in CRYTXTC
(PRNG_VALUE) to RAM.
7. Repeat the encrypt operation.
8. Store the value of CRYTXTC from this round as
the new value of NEW_KEY.
9. Repeat the encrypt operation.
10. Store the value of CRYTXTC from this round as
the new value of NEW_CTR.
Subsequent PRNs can be generated by repeating this
procedure until the reseeding interval has expired. At
that point, the reseeding operation is performed using
the stored values of NEW_KEY and NEW_CTR.
25.9
1.
2.
3.
4.
5.
Generating a True Random
Number
Enable the Cryptographic mode (CRYON
(CRYCONL<15>) = 1).
Set the OPMOD<3:0> bits to ‘1010’.
Start the request by setting the CRYGO bit
(CRYCONL<8>) to ‘1’.
Wait for the CRYGO bit to be cleared to ‘0’ by
the hardware.
Read the random number from the CRYTXTA
register.
25.10 Testing the Key Source
Configuration
The validity of the key source configuration can always
be tested by writing the appropriate register bits and
then reading the KEYFAIL register bit. No operation
needs to be started to perform this check; the module
does not even need to be enabled.
DS30010089C-page 403
PIC24FJ256GA412/GB412 FAMILY
25.11 Programming CFGPAGE (Page 0)
Configuration Bits
1.
2.
3.
4.
5.
If not already set, set the CRYON bit. Set
KEYPG<3:0> to ‘0000’.
Read the PGMFAIL status bit. If this bit is ‘1’, an
illegal configuration has been selected and the
programming operation will not be performed.
Write the data to be programmed into the Configuration Page into CRYTXTC<31:0>. Any bits that are
set (‘1’) will be permanently programmed, while any
bits that are cleared (‘0’) will not be programmed
and may be programmed at a later time.
Set the CRYWR bit. Poll the bit until it is cleared;
alternatively, set the OTPIE bit (CRYOTP<6>) to
enable the optional OTP done interrupt.
Once all programming has completed, set the
CRYREAD bit to reload the values from the
on-chip storage. A read operation must be
performed to complete programming.
Note:
6.
7.
Do not clear the CRYON bit while the
CRYREAD bit is set; this will result in an
incomplete read operation and unavailable
key data. To recover, set CRYON and
CRYREAD, and allow the read operation to
fully complete.
Poll the CRYREAD bit until it is cleared; alternatively, set the OTPIE bit (CRYOTP<6>) to
enable the optional OTP done interrupt.
For production programming, the TSTPGM bit can
be set to indicate a successful programming operation. When TSTPGM is set, the PGMTST bit
(CRYOTP<7>) will also be set, allowing users to
see the OTP array status by performing a read
operation on the array.
Note:
If the device enters Sleep mode during OTP
programming, the contents of the OTP
array may become corrupted. This is not a
recoverable error. Users must ensure that
entry into power-saving modes is disabled
before OTP programming is performed.
DS30010089C-page 404
25.12 Programming Keys
1.
2.
3.
4.
5.
6.
7.
8.
If not already set, set the CRYON bit.
Configure KEYPG<3:0> to the page you want to
program.
Select the key storage destination using the
KEYPSEL bit (CRYOTP<8>).
Read the PGMFAIL status bit. If this bit is ‘1’, an
illegal configuration has been selected and the
programming operation will not be performed.
Write the data to be programmed into the Configuration Page into CRYTXTC<63:0>. Any bits that
are set (‘1’) will be permanently programmed,
while any bits that are cleared (‘0’) will not be
programmed and may be programmed at a later
time.
Set the CRYWR bit. Poll the bit until it is cleared;
alternatively, set the OTPIE bit (CRYOTP<6>) to
enable the optional OTP done interrupt.
Repeat Steps 2 through 5 for each OTP array
page to be programmed.
Once all programming has completed, set the
CRYREAD bit to reload the values from the
on-chip storage. A read operation must be
performed to complete programming.
Note:
Do not clear the CRYON bit while the
CRYREAD bit is set; this will result in an
incomplete read operation and unavailable
key data. To recover, set CRYON and
CRYREAD, and allow the read operation to
fully complete.
9.
Poll the CRYREAD bit until it is cleared; alternatively, set the OTPIE bit (CRYOTP<6>) to
enable the optional OTP done interrupt.
10. For production programming, the TSTPGM bit
can be set to indicate a successful programming
operation. When TSTPGM is set, the PGMTST
bit (CRYOTP<7>) will also be set, allowing
users to see the OTP array status by performing
a read operation on the array.
Note:
If the device enters Sleep mode during OTP
programming, the contents of the OTP array
may become corrupted. This is not a recoverable error. Users must ensure that entry
into power-saving modes is disabled before
OTP programming is performed.
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
25.12.1
KEY RAM WRITE PROTECTION
To prevent accidental overwriting of Key RAM data,
each 64-bit block of Key RAM has an internal write lock
bit that is not accessible from software. When a block
is programmed, its write lock is set; this prevents further
writes to the block. All write locks are cleared when the
Key RAM is erased (resulting from either a tamper
event or a software-initiated wipe) or on a device POR.
25.13 Verifying Programmed Keys
To maintain key security, the Secure OTP Array has no
provision to read back its data to any user-accessible
memory space in any operating mode. Therefore, there is
no way to directly verify programmed data. The only
method for verifying that they have been programmed
correctly is to perform an encryption operation with a
known plaintext/ciphertext pair for each programmed key.
25.15 Operation During Sleep and Idle
Modes
25.15.1
Whenever the device enters any Sleep or Deep Sleep
mode, all operation engine state machines are reset.
This feature helps to preserve the integrity, or any data
being encrypted or decrypted, by discarding any
intermediate text that might be used to break the key.
Any OTP programming operations under way when a
Sleep mode is entered are also halted. Depending on
what is being programmed, this may result in permanent loss of a memory location or potentially the use of
the entire Secure OTP Array. Users are advised to
perform OTP programming only when entry into
power-saving modes is disabled.
Note:
25.14 Key Erasure
Cryptographic keys written to the Secure OTP Array
are considered to be programmatically secure. As they
cannot be read by any program operation in any
operating mode, no provision is made for their erasure.
To prevent an unauthorized third party from obtaining
data in Key RAM, two methods are provided to erase
key data in the event of application tampering:
hardware anti-tampering and software-based erasure.
Hardware anti-tampering monitors the TMPR pin. If a
low pulse or sustained low-voltage level is detected, the
Key RAM will be automatically erased. Anti-tampering
is enabled as a device configuration option by
programming (= 0) the TMPRWIPE Configuration bit
(FDEVOPT<3>).
Software-based erasure uses software monitoring in
the application to detect an interruption of normal execution. Should this happen, the application can set the
KEYWIPE bit (CRYCONH<4>) to immediately erase
the Key RAM.
 2015 Microchip Technology Inc.
OPERATION DURING SLEEP MODES
25.15.2
OTP programming errors, regardless of the
source, are not recoverable errors. Users
should ensure that all foreseeable interruptions to the programming operation,
including device interrupts and entry into
power-saving modes, are disabled.
KEY STORAGE IN DEEP SLEEP
AND VBAT MODES
Under normal circumstances, power is removed from
the Key RAM along with the Cryptographic Engine
during Deep Sleep and VBAT modes. This results in the
loss of any key data that may be stored there. To maintain the Key RAM in these modes, set the KEYRAMEN
bit (DSCON<11>). This will result in a fractional increase
of current consumption.
25.15.3
OPERATION DURING IDLE MODE
When the CRYSIDL bit (CRYCONL<13>) is ‘0’, the
engine will continue any ongoing operations without
interruption when the device enters Idle mode.
When CRYSIDL is ‘1’, the module behaves as in Sleep
modes.
DS30010089C-page 405
PIC24FJ256GA412/GB412 FAMILY
REGISTER 25-1:
U-0
—
CRYCONH: CRYPTOGRAPHIC CONTROL HIGH REGISTER
R/W-0(1)
R/W-0(1)
(2,3)
CTRSIZE6
R/W-0(1)
(2,3)
CTRSIZE5
(2,3)
CTRSIZE4
R/W-0(1)
(2,3)
CTRSIZE3
R/W-0(1)
R/W-0(1)
(2,3)
CTRSIZE2
(2,3)
CTRSIZE1
R/W-0(1)
CTRSIZE0(2,3)
bit 15
R/W-0(1)
SKEYSEL
bit 8
R/W-0(1)
R/W-0(1)
(2)
KEYMOD1
R/S-0(1)
(2)
KEYMOD0
KEYWIPE
R/W-0(1)
(2)
KEYSRC3
R/W-0(1)
R/W-0(1)
(2)
(2)
KEYSRC2
KEYSRC1
R/W-0(1)
KEYSRC0(2)
bit 7
bit 0
Legend:
S = Settable Only bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
Unimplemented: Read as ‘0’
bit 14-8
CTRSIZE<6:0>: Counter Size Select bits(1,2,3)
Counter is defined as CRYTXTB<n:0>, where n = CTRSIZEx. The counter increments after each
operation and generates a rollover event when the counter rolls over from (2n-1 – 1) to 0.
1111111 = 128 bits (CRYTXTB<127:0>)
1111110 = 127 bits (CRYTXTB<126:0>)
•
•
•
0000010 = 3 bits (CRYTXTB<2:0>)
0000001 = 2 bits (CRYTXTB<1:0>)
0000000 = 1 bit (CRYTXTB<0>); rollover event occurs when CRYTXTB<0> toggles from ‘1’ to ‘0’
bit 7
SKEYSEL: Session Key Select bit(1)
1 = Key generation/encryption/loading performed with CRYKEY<255:128>
0 = Key generation/encryption/loading performed with CRYKEY<127:0>
bit 6-5
KEYMOD<1:0>: AES/DES Encrypt/Decrypt Key Mode/Key Length Select bits(1,2)
For DES Encrypt/Decrypt Operations (CPHRSEL = 0):
11 = 64-bit, 3-key 3DES
10 = Reserved
01 = 64-bit, standard 2-key 3DES
00 = 64-bit DES
For AES Encrypt/Decrypt Operations (CPHRSEL = 1):
11 = Reserved
10 = 256-bit AES
01 = 192-bit AES
00 = 128-bit AES
bit 4
KEYWIPE: Key RAM Erase Enable bit(1)
1 = Erase Key RAM (set only by software, cleared only by hardware on the next clock cycle)
0 = Key RAM erase has not been requested or has completed
bit 3-0
KEYSRC<3:0>: Cipher Key Source bits(1,2)
Refer to Table 25-1 and Table 25-2 for KEYSRC<3:0> values.
Note 1:
2:
3:
These bits are reset on system Resets or whenever the CRYMD bit (PMD8<0>) is set.
Writes to these bit fields are locked out whenever an operation is in progress (CRYGO bit is set).
Used only in CTR operations when CRYTXTB is being used as a counter; otherwise, these bits have no effect.
DS30010089C-page 406
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 25-2:
CRYCONL: CRYPTOGRAPHIC CONTROL LOW REGISTER
R/W-0
U-0
R/W-0
R/W-0(1)
R/W-0(1)
R/W-0(1)
U-0
R/W-0, HC(1)
CRYON
—
CRYSIDL(3)
ROLLIE
DONEIE
FREEIE
—
CRYGO
bit 15
R/W-0(1)
bit 8
R/W-0(1)
OPMOD3(2) OPMOD2(2)
R/W-0(1)
R/W-0(1)
OPMOD1(2)
OPMOD0(2)
R/W-0(1)
R/W-0(1)
R/W-0(1)
R/W-0(1)
CPHRSEL(2) CPHRMOD2(2) CPHRMOD1(2) CPHRMOD0(2)
bit 7
bit 0
Legend:
HC = Hardware Clearable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
CRYON: Cryptographic Enable bit
1 = Module is enabled
0 = Module is disabled
bit 14
Unimplemented: Read as ‘0’
bit 13
CRYSIDL: Cryptographic Stop in Idle Control bit(3)
1 = Stops module operation in Idle mode
0 = Continues module operation in Idle mode
bit 12
ROLLIE: CRYTXTB Rollover Interrupt Enable bit(1)
1 = Generates an interrupt event when the counter portion of CRYTXTB rolls over to ‘0’
0 = Does not generate an interrupt event when the counter portion of CRYTXTB rolls over to ‘0’
bit 11
DONEIE: Operation Done Interrupt Enable bit(1)
1 = Generates an interrupt event when the current cryptographic operation completes
0 = Does not generate an interrupt event when the current cryptographic operation completes; software
must poll the CRYGO or CRYBSY bit to determine when the current cryptographic operation is complete
bit 10
FREEIE: Input Text Interrupt Enable bit(1)
1 = Generates an interrupt event when the input text (plaintext or ciphertext) is consumed during the
current cryptographic operation
0 = Does not generate an interrupt event when the input text is consumed
bit 9
Unimplemented: Read as ‘0’
bit 8
CRYGO: Cryptographic Engine Start bit(1)
1 = Starts the operation specified by OPMOD<3:0> (cleared automatically when operation is done)
0 = Stops the current operation (when cleared by software); also indicates the current operation has
completed (when cleared by hardware)
Note 1:
2:
3:
These bits are reset on system Resets or whenever the CRYMD bit (PMD8<0>) is set.
Writes to these bit fields are locked out whenever an operation is in progress (CRYGO bit is set).
If the device enters Idle mode when CRYSIDL = 1, the module will stop its current operation. Entering into
Idle mode while an OTP write operation is in process can result in irreversible corruption of the OTP.
 2015 Microchip Technology Inc.
DS30010089C-page 407
PIC24FJ256GA412/GB412 FAMILY
REGISTER 25-2:
CRYCONL: CRYPTOGRAPHIC CONTROL LOW REGISTER (CONTINUED)
bit 7-4
OPMOD<3:0>: Operating Mode Selection bits(1,2)
1111 = Loads session key (decrypts session key in CRYTXTA/CRYTXTB using the Key Encryption Key
and writes to CRYKEY)
1110 = Encrypts session key (encrypts session key in CRYKEY using the Key Encryption Key and
writes to CRYTXTA/CRYTXTB)
1011 = Generates a session key (generates a True Random Number with the TRNG) and loads it into
CRYKEY
1010 = Generates a True Random Number (using the TRNG) and loads it into CRYTXTA
1001
•
• = Reserved
•
0011
0010 = AES decryption key expansion
0001 = Decryption
0000 = Encryption
bit 3
CPHRSEL: Cipher Engine Select bit(1,2)
1 = AES engine
0 = DES engine
bit 2-0
CPHRMOD<2:0>: Cipher Mode bits(1,2)
11x = Reserved
101 = Reserved
100 = Counter (CTR) mode
011 = Output Feedback (OFB) mode
010 = Cipher Feedback (CFB) mode
001 = Cipher Block Chaining (CBC) mode
000 = Electronic Codebook (ECB) mode
Note 1:
2:
3:
These bits are reset on system Resets or whenever the CRYMD bit (PMD8<0>) is set.
Writes to these bit fields are locked out whenever an operation is in progress (CRYGO bit is set).
If the device enters Idle mode when CRYSIDL = 1, the module will stop its current operation. Entering into
Idle mode while an OTP write operation is in process can result in irreversible corruption of the OTP.
DS30010089C-page 408
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 25-3:
CRYSTAT: CRYPTOGRAPHIC STATUS REGISTER
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
R-x, HSC(1)
R-0, HSC(1)
R/C-0, HS(2)
R/C-0, HS(2)
U-0
CRYBSY (4)
TXTABSY
CRYABRT (5)
ROLLOVR
—
R-0, HSC(1)
R-x, HSC(1)
R-x, HSC(1)
MODFAIL(3) KEYFAIL(3,4) PGMFAIL(3,4)
bit 7
bit 0
Legend:
C = Clearable bit
HSC = Hardware Settable/Clearable bit
R = Readable bit
HS = Hardware Settable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-8
Unimplemented: Read as ‘0’
bit 7
CRYBSY: Cryptographic Engine Busy Status bit (1, 4)
1 = A cryptographic operation is in progress
0 = No cryptographic operation is in progress
bit 6
TXTABSY: CRYTXTA Busy Status bit (1)
1 = The CRYTXTA register is busy and may not be written to
0 = The CRYTXTA is free and may be written to
bit 5
CRYABRT: Cryptographic Operation Aborted Status bit (2,5)
1 = Last operation was aborted by clearing the CRYGO bit in software
0 = Last operation completed normally (CRYGO cleared in hardware)
bit 4
ROLLOVR: Counter Rollover Status bit (2)
1 = The CRYTXTB counter rolled over on the last CTR mode operation; once set, this bit must be
cleared by software before the CRYGO bit can be set again
0 = No rollover event has occurred
bit 3
Unimplemented: Read as ‘0’
bit 2
MODFAIL: Mode Configuration Fail Flag bit(1,3)
1 = Currently selected operating and Cipher mode configuration is invalid; the CRYWR bit cannot be
set until a valid mode is selected (automatically cleared by hardware with any valid configuration)
0 = Currently selected operating and Cipher mode configurations are valid
bit 1
KEYFAIL: Key Configuration Fail Status bit(1,3,4)
See Table 25-1 and Table 25-2 for invalid key configurations.
1 = Currently selected key and mode configurations are invalid; the CRYWR bit cannot be set until a
valid mode is selected (automatically cleared by hardware with any valid configuration)
0 = Currently selected configurations are valid
bit 0
PGMFAIL: Key Storage/Configuration Program Fail Flag bit(1,3,4)
1 = The page indicated by KEYPG<3:0> is reserved or locked; the CRYWR bit cannot be set and no
programming operation can be started
0 = The page indicated by KEYPG<3:0> is available for programming
Note 1:
2:
3:
4:
5:
These bits are reset on system Resets or whenever the CRYMD bit (PMD8<0>) is set.
These bits are reset on system Resets when the CRYMD bit is set or when CRYGO is cleared.
These bits are functional even when the module is disabled (CRYON = 0); this allows mode configurations
to be validated for compatibility before enabling the module.
These bits are automatically set during all OTP read operations, including the initial read at POR. Once the
read is completed, the bit assumes the proper state that reflects the current configuration.
If this bit is set, a cryptographic operation cannot be performed.
 2015 Microchip Technology Inc.
DS30010089C-page 409
PIC24FJ256GA412/GB412 FAMILY
REGISTER 25-4:
CRYOTP: CRYPTOGRAPHIC OTP PAGE PROGRAM CONTROL REGISTER
U-0
U-0
U-0
U-0
U-0
U-0
U-0
R/W-0
—
—
—
—
—
—
—
KEYPSEL
bit 15
bit 8
R-x, HSC(1)
R/W-0(1)
R/S-1, HC
R/W-0(1)
R/W-0(1)
R/W-0(1)
R/W-0(1)
R/S-0, HC(2)
PGMTST
OTPIE
CRYREAD(3,4)
KEYPG3
KEYPG2
KEYPG1
KEYPG0
CRYWR(3,4)
bit 7
bit 0
Legend:
S = Settable Only bit
HSC = Hardware Settable/Clearable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
HC = Hardware Clearable bit
bit 15-9
Unimplemented: Read as ‘0’
bit 8
KEYPSEL: Key Storage Programming Select bit
1 = Programming operations write to Key RAM
0 = Programming operations write to the Secure OTP Array
bit 7
PGMTST: Key Storage/Configuration Program Test bit(1)
This bit mirrors the state of the TSTPGM bit and is used to test the programming of the Secure OTP
Array after programming.
1 = TSTPGM (CFGPAGE<30>) is programmed (‘1’)
0 = TSTPGM is not programmed (‘0’)
bit 6
OTPIE: Key Storage/Configuration Program Interrupt Enable bit(1)
1 = Generates an interrupt when the current programming or read operation completes
0 = Does not generate an interrupt when the current programming or read operation completes; software
must poll the CRYWR, CRYREAD or CRYBSY bit to determine when the current programming
operation is complete
bit 5
CRYREAD: Cryptographic Key Storage/Configuration Read bit(3,4)
1 = This bit is set to start a read operation; read operation is in progress while this bit is set and CRYGO = 1
0 = Read operation has completed
bit 4-1
KEYPG<3:0>: Key Storage/Configuration Program Page Select bits(1)
1111
• • • = Reserved
1001
1000 = OTP Page 8
0111 = OTP Page 7
0110 = OTP Page 6
0101 = OTP Page 5
0100 = OTP Page 4
0011 = OTP Page 3
0010 = OTP Page 2
0001 = OTP Page 1
0000 = Configuration Page (CFGPAGE, OTP Page 0)
bit 0
CRYWR: Cryptographic Key Storage/Configuration Program bit(2,3,4)
1 = Programs the Key Storage/Configuration bits with the value found in CRYTXTC<63:0>
0 = Program operation has completed
Note 1:
2:
3:
4:
These bits are reset on system Resets or whenever the CRYMD bit (PMD8<0>) is set.
These bits are reset on system Resets when the CRYMD bit is set or when CRYGO is cleared.
Set this bit only when CRYON = 1 and CRYGO = 0. Do not set CRYREAD or CRYWR both, at any given time.
Do not clear CRYON or these bits while they are set; always allow the hardware operation to complete
and clear the bits automatically.
DS30010089C-page 410
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 25-5:
r-x
CFGPAGE: SECURE ARRAY CONFIGURATION BITS (OTP PAGE 0)
REGISTER
R/PO-x
(1)
—
TSTPGM
R/P-x
R/P-x
R/PO-x
R/PO-x
R/PO-x
R/PO-x
KEYSZRAM1 KEYSZRAM0 KEY4TYPE1 KEY4TYPE0 KEY3TYPE1 KEY3TYPE0
bit 31
bit 24
R/PO-x
R/PO-x
R/PO-x
R/PO-x
KEY2TYPE1 KEY2TYPE0 KEY1TYPE1 KEY1TYPE0
R/PO-x
R/PO-x
R/PO-x
R/PO-x
SKEYEN
LKYSRC7
LKYSRC6
LKYSRC5
bit 23
bit 16
R/PO-x
R/PO-x
R/PO-x
R/PO-x
R/PO-x
R/PO-x
R/PO-x
R/PO-x
LKYSRC4
LKYSRC3
LKYSRC2
LKYSRC1
LKYSRC0
SRCLCK
WRLOCK8
WRLOCK7
bit 15
bit 8
R/PO-x
R/PO-x
R/PO-x
R/PO-x
R/PO-x
R/PO-x
R/PO-x
R/PO-x
WRLOCK6
WRLOCK5
WRLOCK74
WRLOCK3
WRLOCK2
WRLOCK1
WRLOCK0
SWKYDIS
bit 7
bit 0
Legend:
r = Reserved bit
R = Readable bit
PO = Program Once bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 31
Reserved: Do not modify
bit 30
TSTPGM: Customer Program Test bit(1)
1 = CFGPAGE has been programmed
0 = CFGPAGE has not been programmed
bit 29-28
KEYSZRAM<1:0>: Key Type Selection bits (Key RAM Pages)
11 = Keys in these pages are 192/256-bit AES operations only
10 = Keys in these pages are 128-bit AES operations only
01 = Keys in these pages are DES3 operations only
00 = Keys in these pages are DES/DES2 operations only
bit 27-26
KEY4TYPE<1:0>: Key Type for OTP Pages 7 and 8 bits
11 = Keys in these pages are for 192-bit/256-bit AES operations only
10 = Keys in these pages are for 128-bit AES operations only
01 = Keys in these pages are for 3DES operations only
00 = Keys in these pages are for DES/2DES operations only
bit 25-24
KEY3TYPE<1:0>: Key Type for OTP Pages 5 and 6 bits
11 = Keys in these pages are for 192-bit/256-bit AES operations only
10 = Keys in these pages are for 128-bit AES operations only
01 = Keys in these pages are for 3DES operations only
00 = Keys in these pages are for DES/2DES operations only
bit 23-22
KEY2TYPE<1:0>: Key Type for OTP Pages 3 and 4 bits
11 = Keys in these pages are for 192-bit/256-bit AES operations only
10 = Keys in these pages are for 128-bit AES operations only
01 = Keys in these pages are for 3DES operations only
00 = Keys in these pages are for DES/2DES operations only
Note 1:
x = Bit is unknown
This bit’s state is mirrored by the PGMTST bit (CRYOTP<7>).
 2015 Microchip Technology Inc.
DS30010089C-page 411
PIC24FJ256GA412/GB412 FAMILY
REGISTER 25-5:
CFGPAGE: SECURE ARRAY CONFIGURATION BITS (OTP PAGE 0)
REGISTER (CONTINUED)
bit 21-20
KEY1TYPE<1:0>: Key Type for OTP Pages 1 and 2 bits
11 = Keys in these pages are for 192-bit/256-bit AES operations only
10 = Keys in these pages are for 128-bit AES operations only
01 = Keys in these pages are for 3DES operations only
00 = Keys in these pages are for DES/2DES operations only
bit 19
SKEYEN: Session Key Enable bit
1 = Stored Key #1 may be used only as a Key Encryption Key
0 = Stored Key #1 may be used for any operation
bit 18-11
LKYSRC<7:0>: Locked Key Source Configuration bits
If SRCLCK = 1:
1xxxxxxx = Key source is as if KEYSRC<3:0> = 1111
01xxxxxx = Key source is as if KEYSRC<3:0> = 0111
001xxxxx = Key source is as if KEYSRC<3:0> = 0110
0001xxxx = Key source is as if KEYSRC<3:0> = 0101
00001xxx = Key source is as if KEYSRC<3:0> = 0100
000001xx = Key source is as if KEYSRC<3:0> = 0011
0000001x = Key source is as if KEYSRC<3:0> = 0010
00000001 = Key source is as if KEYSRC<3:0> = 0001
00000000 = Key source is as if KEYSRC<3:0> = 0000
If SRCLCK = 0:
These bits are ignored.
bit 10
SRCLCK: Key Source Lock bit
1 = The key source is determined by the LKYSRC<7:0> bits (software key selection is disabled)
0 = The key source is determined by the KEYSRC<3:0> (CRYCONH<3:0>) bits (locked key selection
is disabled)
bit 9-1
WRLOCK<8:0>: Write Lock Page Enable bits
For OTP Pages 0 (CFGPAGE) through 8:
1 = OTP Page is permanently locked and may not be programmed
0 = OTP Page is unlocked and may be programmed
bit 0
SWKYDIS: Software Key Disable bit
1 = Software key (CRYKEY register) is disabled; when KEYSRC<3:0> = 0000, the KEYFAIL status bit
will be set and no encryption/decryption/session key operations can be started until KEYSRC<3:0>
bits are changed to a value other than ‘0000’
0 = Software key (CRYKEY register) can be used as a key source when KEYSRC<3:0> = 0000
Note 1:
This bit’s state is mirrored by the PGMTST bit (CRYOTP<7>).
DS30010089C-page 412
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
TABLE 25-1:
Mode of
Operation
DES/3DES KEY SOURCE SELECTION
KEYMOD<1:0>
KEYSRC<3:0>
(1)
0000
0001
64-Bit DES
00
Note 1:
2:
DES Key #1
Key Config Error
—
(2)
<63:0>
0011
DES Key #3
<191:128>
0100
DES Key #4
<255:192>
0101
DES Key #5
<319:256>
0110
DES Key #6
<383:320>
0111
DES Key #7
<447:384>
1001
DES Key #1 (RAM)
<63:0>
1010
DES Key #2 (RAM)
<127:64>
1011
DES Key #3 (RAM)
<191:128>
1100
DES Key #4 (RAM)
<255:192>
1101
DES Key #5 (RAM)
<319:256>
1110
DES Key #6 (RAM)
<383:320>
1111
DES Key #7 (RAM)
<447:384>
(2)
—
Key Config Error
CRYKEY<63:0> (1st/3rd)
CRYKEY<127:64> (2nd)
DES Key #1 (1st/3rd)
DES Key #2 (2nd)
—
Key Config Error(2)
<63:0>
<127:64>
0010
DES Key #3 (1st/3rd)
DES Key #4 (2nd)
<191:128>
<255:192>
0011
DES Key #5 (1st/3rd)
DES Key #6 (2nd)
<319:256>
<383:320>
0100
DES Key #7 (1st/3rd)
DES Key #8 (2nd)
<447:384>
<511:448>
1001
DES Key #9 (1st/3rd) (RAM)
DES Key #10 (2nd) (RAM)
<63:0>
<127:64>
1010
DES Key #11 (1st/3rd) (RAM)
DES Key #12 (2nd) (RAM)
<191:128>
<255:192>
1011
DES Key #13 (1st/3rd) (RAM)
DES Key #14 (2nd) (RAM)
<319:256>
<383:320>
1100
DES Key #15 (1st/3rd) (RAM)
DES Key #16 (2nd) (RAM)
<447:384>
<511:448>
1111
Reserved(2)
—
All Others
10
CRYKEY<63:0>
<127:64>
0001
(Reserved)
1
DES Key #2
0000(1)
01
0
OTP OR RAM
Array Address
0010
All Others
64-Bit, 2-Key
3DES
(Standard 2-Key
E-D-E/D-E-D)
Session Key Source (SESSKEY)
xxxx
Error(2)
—
Key Config Error(2)
—
Key Config
This configuration is considered a key configuration error (KEYFAIL bit is set) if SWKYDIS is also set.
The KEYFAIL bit (CRYSTAT<1>) is set when these configurations are selected and remains set until a
valid configuration is selected.
 2015 Microchip Technology Inc.
DS30010089C-page 413
PIC24FJ256GA412/GB412 FAMILY
TABLE 25-1:
Mode of
Operation
DES/3DES KEY SOURCE SELECTION (CONTINUED)
KEYMOD<1:0>
KEYSRC<3:0>
0000(1)
0001
64-Bit, 3-Key
3DES
0
1
CRYKEY<63:0> (1st Iteration)
CRYKEY<127:64> (2nd Iteration)
CRYKEY<191:128> (3rd Iteration)
DES Key #1 (1st)
DES Key #2 (2nd)
DES Key #3 (3rd)
Key Config Error(2)
OTP OR RAM
Array Address
—
<63:0>
<127:64>
<191:128>
0010
DES Key #4 (1st)
DES Key #5 (2nd)
DES Key #6 (3rd)
<255:192>
<319:256>
<383:320>
1001
DES Key #4 (1st) (RAM)
DES Key #5 (2nd) (RAM)
DES Key #6 (3rd) (RAM)
<63:0>
<127:64>
<191:128>
1010
DES Key #7 (1st) (RAM)
DES Key #8 (2nd) (RAM)
DES Key #9 (3rd) (RAM)
<255:192>
<319:256>
<383:320>
1111
Reserved(2)
—
11
All Others
Note 1:
2:
Session Key Source (SESSKEY)
Key Config
Error(2)
—
This configuration is considered a key configuration error (KEYFAIL bit is set) if SWKYDIS is also set.
The KEYFAIL bit (CRYSTAT<1>) is set when these configurations are selected and remains set until a
valid configuration is selected.
DS30010089C-page 414
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
TABLE 25-2:
Mode of
Operation
AES KEY MODE/SOURCE SELECTION
KEYMOD<1:0>
KEYSRC<3:0>
0000(1)
0001
128-Bit AES
00
<383:256>
AES Key #4
<511:384>
1001
AES Key #5 (RAM)
<127:0>
1010
AES Key #6 (RAM)
<255:128>
1011
AES Key #7 (RAM)
<383:256>
1100
AES Key #8 (RAM)
<511:384>
Reserved
Key Config
(2)
—
Error(2)
—
CRYKEY<191:0>
AES Key #1
—
Key Config Error(2)
<191:0>
0010
AES Key #2
<383:192>
1001
AES Key #3 (RAM)
<191:0>
1010
AES Key #4 (RAM)
<383:192>
1111
Reserved(2)
—
0001
11
<127:0>
AES Key #3
0000(1)
Note 1:
2:
Key Config
0100
All Others
(Reserved)
AES Key #1
—
Error(2)
0011
0001
10
CRYKEY<127:0>
<255:128>
0000(1)
256-Bit AES
OTP Address
SKEYEN = 1
AES Key #2
All Others
01
SKEYEN = 0
0010
1111
192-Bit AES
Key Source
Key Config
Error(2)
—
CRYKEY<255:0>
AES Key #1
Key Config
—
Error(2)
<255:0>
0010
AES Key #2
1001
AES Key #3 (RAM)
<255:0>
1010
AES Key #4 (RAM)
<511:256>
1111
Reserved(2)
—
All Others
Key Config Error(2)
—
Error(2)
—
xxxx
Key Config
<511:256>
This configuration is considered a key configuration error (KEYFAIL bit is set) if SWKYDIS is also set.
The KEYFAIL bit (CRYSTAT<1>) is set when these configurations are selected and remains set until a
valid configuration is selected.
 2015 Microchip Technology Inc.
DS30010089C-page 415
PIC24FJ256GA412/GB412 FAMILY
NOTES:
DS30010089C-page 416
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
26.0
32-BIT PROGRAMMABLE
CYCLIC REDUNDANCY CHECK
(CRC) GENERATOR
Note:
The 32-bit programmable CRC generator provides a
hardware implemented method of quickly generating
checksums for various networking and security
applications. It offers the following features:
• User-Programmable CRC Polynomial Equation,
up to 32 bits
• Programmable Shift Direction (little or big-endian)
• Independent Data and Polynomial Lengths
• Configurable Interrupt Output
• Data FIFO
This data sheet summarizes the features of
this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to
the “dsPIC33/PIC24 Family Reference
Manual”, “32-Bit Programmable Cyclic
Redundancy
Check
(CRC)”
(DS30009729). The information in this
data sheet supersedes the information in
the FRM.
FIGURE 26-1:
Figure 26-1 displays a simplified block diagram of the
CRC generator. A simple version of the CRC shift
engine is displayed in Figure 26-2.
CRC MODULE BLOCK DIAGRAM
CRCDATH
CRCDATL
CRCISEL
FIFO Empty
Variable FIFO
(4x32, 8x16 or 16x8)
CRCWDATH
CRCWDATL
Shift
Complete
1
CRC
Interrupt
0
LENDIAN
Shift Buffer
1
CRC Shift Engine
0
Shifter Clock
2 * FCY
FIGURE 26-2:
CRC SHIFT ENGINE DETAIL
CRC Shift Engine
CRCWDATH
CRCWDATL
Read/Write Bus
X0
Shift Buffer
Data
Note 1:
Xn(1)
X1
Bit 0
Bit 1
Bit n(1)
n = PLEN<4:1> + 1.
 2015 Microchip Technology Inc.
DS30010089C-page 417
PIC24FJ256GA412/GB412 FAMILY
26.1
26.1.1
User Interface
26.1.2
POLYNOMIAL INTERFACE
The CRC module can be programmed for CRC
polynomials of up to the 32nd order, using up to 32 bits.
Polynomial length, which reflects the highest exponent
in the equation, is selected by the PLEN<4:0> bits
(CRCCON2<4:0>).
The CRCXORL and CRCXORH registers control which
exponent terms are included in the equation. Setting a
particular bit includes that exponent term in the equation. Functionally, this includes an XOR operation on
the corresponding bit in the CRC engine. Clearing the
bit disables the XOR.
For example, consider two CRC polynomials, one is a
16-bit and the other is a 32-bit equation.
EQUATION 26-1:
DATA INTERFACE
The module incorporates a FIFO that works with a
variable data width. Input data width can be configured
to any value, between 1 and 32 bits, using the
DWIDTH<4:0> bits (CRCCON2<12:8>). When the
data width is greater than 15, the FIFO is 4 words deep.
When the DWIDTHx bits are between 15 and 8, the
FIFO is 8 words deep. When the DWIDTHx bits are
less than 8, the FIFO is 16 words deep.
The data for which the CRC is to be calculated must
first be written into the FIFO. Even if the data width is
less than 8, the smallest data element that can be
written into the FIFO is 1 byte. For example, if the
DWIDTHx bits are 5, then the size of the data is
DWIDTH<4:0> + 1 or 6. The data is written as a whole
byte; the two unused upper bits are ignored by the
module.
Once data is written into the MSb of the CRCDAT registers (that is, the MSb as defined by the data width),
the value of the VWORD<4:0> bits (CRCCON1<12:8>)
increments by one. For example, if the DWIDTHx bits
are 24, the VWORDx bits will increment when bit 7 of
CRCDATH is written. Therefore, CRCDATL must
always be written to before CRCDATH.
16-BIT, 32-BIT CRC
POLYNOMIALS
X16 + X12 + X5 + 1
and
X32+X26 + X23 + X22 + X16 + X12 + X11 + X10 +
X8 + X7 + X5 + X4 + X2 + X + 1
To program these polynomials into the CRC generator,
set the register bits, as shown in Table 26-1.
Note that the appropriate positions are set to ‘1’ to indicate that they are used in the equation (for example,
X26 and X23). The ‘0’ bit required by the equation is
always XORed; thus, X0 is a don’t care. For a polynomial of length 32, it is assumed that the 32nd bit will
be used. Therefore, the X<31:1> bits do not have the
32nd bit.
The CRC engine starts shifting data when the CRCGO
bit is set and the value of the VWORDx bits is greater
than zero.
Each word is copied out of the FIFO into a buffer register,
which decrements the VWORDx bits. The data is then
shifted out of the buffer. The CRC engine continues shifting at a rate of two bits per instruction cycle, until the
VWORDx bits reach zero. This means that for a given
data width, it takes half that number of instructions for
each word to complete the calculation. For example, it
takes 16 cycles to calculate the CRC for a single word of
32-bit data.
When the VWORDx bits reach the maximum value for
the configured value of the DWIDTHx bits (4, 8 or 16),
the CRCFUL bit becomes set. When the VWORDx bits
reach zero, the CRCMPT bit becomes set. The FIFO is
emptied and the VWORD<4:0> bits are set to ‘00000’
whenever CRCEN is ‘0’.
At least one instruction cycle must pass after a write to
CRCWDAT before a read of the VWORDx bits is done.
TABLE 26-1:
CRC SETUP EXAMPLES FOR 16 AND 32-BIT POLYNOMIALS
CRC Control Bits
Bit Values
16-Bit Polynomial
32-Bit Polynomial
PLEN<4:0>
01111
11111
X<31:16>
0000 0000 0000 0001
0000 0100 1100 0001
X<15:0>
0001 0000 0010 000x
0001 1101 1011 011x
DS30010089C-page 418
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
26.1.3
DATA SHIFT DIRECTION
The LENDIAN bit (CRCCON1<3>) is used to control
the shift direction. By default, the CRC will shift data
through the engine, MSb first. Setting LENDIAN (= 1)
causes the CRC to shift data, LSb first. This setting
allows better integration with various communication
schemes and removes the overhead of reversing the
bit order in software. Note that this only changes the
direction the data is shifted into the engine. The result
of the CRC calculation will still be a normal CRC result,
not a reverse CRC result.
26.1.4
INTERRUPT OPERATION
The module generates an interrupt that is configurable
by the user for either of two conditions.
If CRCISEL is ‘0’, an interrupt is generated when the
VWORD<4:0> bits make a transition from a value of ‘1’
to ‘0’. If CRCISEL is ‘1’, an interrupt will be generated
after the CRC operation finishes and the module sets
the CRCGO bit to ‘0’. Manually setting CRCGO to ‘0’
will not generate an interrupt. Note that when an
interrupt occurs, the CRC calculation would not yet be
complete. The module will still need (PLEN + 1)/2 clock
cycles, after the interrupt is generated, until the CRC
calculation is finished.
26.1.5
TYPICAL OPERATION
To use the module for a typical CRC calculation:
1.
2.
3.
Set the CRCEN bit to enable the module.
Configure the module for desired operation:
a) Program the desired polynomial using the
CRCXORL and CRCXORH registers, and the
PLEN<4:0> bits.
b) Configure the data width and shift direction
using the DWIDTH<4:0> and LENDIAN bits.
c) Select the desired Interrupt mode using the
CRCISEL bit.
Preload the FIFO by writing to the CRCDATL
and CRCDATH registers until the CRCFUL bit is
set or no data is left.
 2015 Microchip Technology Inc.
4.
5.
6.
7.
8.
Clear old results by writing 00h to CRCWDATL
and CRCWDATH. The CRCWDAT registers can
also be left unchanged to resume a previously
halted calculation.
Set the CRCGO bit to start calculation.
Write the remaining data into the FIFO as space
becomes available.
When the calculation completes, CRCGO is
automatically cleared. An interrupt will be
generated if CRCISEL = 1.
Read CRCWDATL and CRCWDATH for the
result of the calculation.
There are eight registers used to control programmable
CRC operation:
•
•
•
•
•
•
•
•
CRCCON1
CRCCON2
CRCXORL
CRCXORH
CRCDATL
CRCDATH
CRCWDATL
CRCWDATH
The CRCCON1 and CRCCON2 registers (Register 26-1
and Register 26-2) control the operation of the module
and configure the various settings.
The CRCXOR registers (Register 26-3 and
Register 26-4) select the polynomial terms to be used
in the CRC equation. The CRCDAT and CRCWDAT
registers are each register pairs that serve as buffers
for the double-word input data, and CRC processed
output, respectively.
DS30010089C-page 419
PIC24FJ256GA412/GB412 FAMILY
REGISTER 26-1:
CRCCON1: CRC CONTROL REGISTER 1
R/W-0
U-0
R/W-0
R-0, HSC
R-0, HSC
R-0, HSC
R-0, HSC
R-0, HSC
CRCEN
—
CSIDL
VWORD4
VWORD3
VWORD2
VWORD1
VWORD0
bit 15
bit 8
R-0, HSC
R-1, HSC
R/W-0
R/W-0, HC
R/W-0
U-0
U-0
U-0
CRCFUL
CRCMPT
CRCISEL
CRCGO
LENDIAN
—
—
—
bit 7
bit 0
Legend:
HC = Hardware Clearable bit
HSC = Hardware Settable/Clearable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
CRCEN: CRC Enable bit
1 = Enables module
0 = Disables module; all state machines, pointers and CRCWDAT/CRCDAT registers reset; other SFRs
are NOT reset
bit 14
Unimplemented: Read as ‘0’
bit 13
CSIDL: CRC Stop in Idle Mode bit
1 = Discontinues module operation when device enters Idle mode
0 = Continues module operation in Idle mode
bit 12-8
VWORD<4:0>: Pointer Value bits
Indicates the number of valid words in the FIFO. Has a maximum value of 8 when PLEN<4:0>  7 or 16
when PLEN<4:0> 7.
bit 7
CRCFUL: FIFO Full bit
1 = FIFO is full
0 = FIFO is not full
bit 6
CRCMPT: CRC FIFO Empty bit
1 = FIFO is empty
0 = FIFO is not empty
bit 5
CRCISEL: CRC Interrupt Selection bit
1 = Interrupt on FIFO is empty; the final word of data is still shifting through the CRC
0 = Interrupt on shift is complete and results are ready
bit 4
CRCGO: Start CRC bit
1 = Starts CRC serial shifter
0 = CRC serial shifter is turned off
bit 3
LENDIAN: Data Shift Direction Select bit
1 = Data word is shifted into the FIFO, starting with the LSb (little-endian)
0 = Data word is shifted into the FIFO, starting with the MSb (big-endian)
bit 2-0
Unimplemented: Read as ‘0’
DS30010089C-page 420
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 26-2:
CRCCON2: CRC CONTROL REGISTER 2
U-0
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
—
DWIDTH4
DWIDTH3
DWIDTH2
DWIDTH1
DWIDTH0
bit 15
bit 8
U-0
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
—
PLEN4
PLEN3
PLEN2
PLEN1
PLEN0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-13
Unimplemented: Read as ‘0’
bit 12-8
DWIDTH<4:0>: Data Word Width Configuration bits
Configures the width of the data word (Data Word Width – 1).
bit 7-5
Unimplemented: Read as ‘0’
bit 4-0
PLEN<4:0>: Polynomial Length Configuration bits
Configures the length of the polynomial (Polynomial Length – 1).
 2015 Microchip Technology Inc.
x = Bit is unknown
DS30010089C-page 421
PIC24FJ256GA412/GB412 FAMILY
REGISTER 26-3:
R/W-0
CRCXORL: CRC XOR POLYNOMIAL REGISTER, LOW BYTE
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
X<15:8>
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
U-0
—
X<7:1>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-1
X<15:1>: XOR of Polynomial Term xn Enable bits
bit 0
Unimplemented: Read as ‘0’
REGISTER 26-4:
R/W-0
x = Bit is unknown
CRCXORH: CRC XOR POLYNOMIAL REGISTER, HIGH BYTE
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
X<31:24>
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
X<23:16>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-0
x = Bit is unknown
X<31:16>: XOR of Polynomial Term xn Enable bits
DS30010089C-page 422
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
27.0
Note:
12-BIT A/D CONVERTER WITH
THRESHOLD DETECT
This data sheet summarizes the features
of this group of PIC24F devices. It is not
intended to be a comprehensive reference source. For more information on
the 12-Bit A/D Converter, refer to the
“dsPIC33/PIC24
Family
Reference
Manual”, “12-Bit A/D Converter with
Threshold Detect” (DS39739).
27.1
To perform a standard A/D conversion:
1.
The 12-bit A/D Converter has the following key
features:
• Successive Approximation Register (SAR)
Conversion
• Conversion Speeds of up to 200 ksps
• Up to 20 Analog Input Channels (internal and
external)
• Selectable 10-Bit or 12-Bit (default) Conversion
Resolution
• Multiple Internal Reference Input Channels
• External Voltage Reference Input Pins
• Unipolar Differential Sample-and-Hold (S/H)
Amplifier
• Automated Threshold Scan and Compare
Operation to Pre-Evaluate Conversion Results
• Selectable Conversion Trigger Source
• Fixed Length (one word per channel),
Configurable Conversion Result Buffer
• Four Options for Results Alignment
• Configurable Interrupt Generation
• Enhanced DMA Operations with Indirect Address
Generation
• Operation During CPU Sleep and Idle modes
Basic Operation
2.
3.
Configure the module:
a) Configure port pins as analog inputs by
setting the appropriate bits in the ANSx registers (see Section 11.2 “Configuring
Analog Port Pins (ANSx)” for more
information).
b) Select the voltage reference source to
match the expected range on analog inputs
(AD1CON2<15:13>).
c) Select the positive and negative multiplexer
inputs for each channel (AD1CHS<15:0>).
d) Select the analog conversion clock to match
the desired data rate with the processor
clock (AD1CON3<7:0>).
e) Select the appropriate sample/conversion
sequence
(AD1CON1<7:4>
and
AD1CON3<12:8>).
f) For Channel A scanning operations, select
the positive channels to be included
(AD1CSSH and AD1CSSL registers).
g) Select how conversion results are
presented in the buffer (AD1CON1<9:8>
and AD1CON5 register).
h) Select the interrupt rate (AD1CON2<6:2>).
i) Turn on A/D module (AD1CON1<15>).
Configure the A/D interrupt (if required):
a) Clear the AD1IF bit (IFS0<13>).
b) Enable the AD1IE interrupt (IEC0<13>).
c) Select the A/D interrupt priority (IPC3<6:4>).
If the module is configured for manual sampling,
set the SAMP bit (AD1CON1<1>) to begin
sampling.
The 12-bit A/D Converter module is an enhanced
version of the 10-bit module offered in earlier PIC24
devices. It is a Successive Approximation Register
(SAR) Converter, enhanced with 12-bit resolution, a
wide range of automatic sampling options, tighter integration with other analog modules and a configurable
results buffer.
It also includes a unique Threshold Detect feature that
allows the module itself to make simple decisions
based on the conversion results, and enhanced operation with the DMA Controller through Peripheral Indirect
Addressing (PIA).
A simplified block diagram for the module is shown in
Figure 27-1.
 2015 Microchip Technology Inc.
DS30010089C-page 423
PIC24FJ256GA412/GB412 FAMILY
FIGURE 27-1:
12-BIT A/D CONVERTER BLOCK DIAGRAM (PIC24FJ256GA412/GB412 FAMILY)
Internal Data Bus
AVSS
VREF+
VREF-
VR Select
AVDD
VR+
16
VRComparator
VINH
VINL
AN0
VRS/H
AN1
VR+
DAC
12-Bit SAR
Conversion Logic
AN2
VINH
MUX A
Data Formatting
AN9
Extended DMA Data
VINL
ADC1BUF0:
ADC1BUF25
AN21(1)
AD1CON1
AN22(1)
AD1CON2
AN23(1)
AD1CON3
AD1CON4
MUX B
VBG
VBG/2
VBAT/2
VINH
AD1CON5
AD1CHS
AD1CHITL
VINL
AD1CHITH
AD1CSSL
AD1CSSH
AD1DMBUF
AVDD
AVSS
CTMU
Sample Control
Control Logic
Conversion Control
16
Input MUX Control
DMA Data Bus
Note 1:
AN16 through AN23 are not implemented on 64-pin devices.
DS30010089C-page 424
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
27.2
Extended DMA Operations
In addition to the standard features available on all
12-bit A/D Converters, PIC24FJ256GA412/GB412
family devices implement a limited extension of DMA
functionality. This extension adds features that work
with the device’s DMA Controller to expand the A/D
module’s data storage abilities beyond the module’s
built-in buffer.
The Extended DMA functionality is controlled by the
DMAEN bit (AD1CON1<11>); setting this bit enables
the functionality. The DMABM bit (AD1CON1<12>)
configures how the DMA feature operates.
27.2.1
EXTENDED BUFFER MODE
Extended Buffer mode (DMABM = 1) is useful for
storing the results of channels. It can also be used to
store the conversion results on any A/D channel in any
implemented address in data RAM.
In Extended Buffer mode, all data from the A/D Buffer
register, and channels above 26, is mapped into data
RAM. Conversion data is written to a destination
specified by the DMA Controller, specifically by the
DMADSTn register. This allows users to read the conversion results of channels above 26, which do not
have their own memory-mapped A/D buffer locations,
from data memory.
When using Extended Buffer mode, always set the
BUFREGEN bit to disable FIFO operation. In addition,
disable the Split Buffer mode by clearing the BUFM bit.
27.2.2
PIA MODE
When DMABM = 0, the A/D module is configured to
function with the DMA Controller for Peripheral Indirect
Addressing (PIA) mode operations. In this mode, the
A/D module generates an 11-bit Indirect Address (IA).
This is ORed with the destination address in the DMA
Controller to define where the A/D conversion data will
be stored.
In PIA mode, the buffer space is created as a series of
contiguous smaller buffers, one per analog channel.
The size of the channel buffer determines how many
analog channels can be accommodated. The size of
the buffer is selected by the DMABL<2:0> bits
(AD1CON4<2:0>). The size options range from a
single word per buffer to 128 words. Each channel is
allocated a buffer of this size, regardless of whether or
not the channel will actually have conversion data.
The IA is created by combining the base address within
a channel buffer with three to five bits (depending on
the buffer size) to identify the channel. The base
address ranges from zero to seven bits wide, depending on the buffer size. The address is right-padded with
a ‘0’ in order to maintain address alignment in the Data
Space. The concatenated channel and base address
bits are then left-padded with zeros, as necessary, to
complete the 11-bit IA.
The IA is configured to auto-increment during write
operations by using the SMPIx bits (AD1CON2<6:2>).
As with PIA operations for any DMA-enabled module,
the base destination address in the DMADSTn register
must be masked properly to accommodate the IA.
Table 27-1 shows how complete addresses are
formed. Note that the address masking varies for each
buffer size option. Because of masking requirements,
some address ranges may not be available for certain
buffer sizes. Users should verify that the DMA base
address is compatible with the buffer size selected.
Figure 27-2 shows how the parts of the address define
the buffer locations in data memory. In this case, the
module “allocates” 256 bytes of data RAM (1000h to
1100h) for 32 buffers of four words each. However, this
is not a hard allocation and nothing prevents these
locations from being used for other purposes. For
example, in the current case, if Analog Channels 1, 3
and 8 are being sampled and converted, conversion
data will only be written to the channel buffers, starting
at 1008h, 1018h and 1040h. The holes in the PIA buffer
space can be used for any other purpose. It is the
user’s responsibility to keep track of buffer locations
and prevent data overwrites.
27.3
A/D Operation with VBAT
One of the A/D channels is connected to the VBAT pin
to monitor the VBAT voltage. This allows monitoring the
VBAT pin voltage (battery voltage) with no external connection. The voltage measured, using the A/D VBAT
monitor, is VBAT/2. The voltage can be calculated by
reading A/D = ((VBAT/2)/VDD) * 1024 for 10-bit A/D and
((VBAT/2)/VDD) * 4096 for 12 bit A/D.
When using the VBAT A/D monitor:
• Connect the A/D channel to ground to discharge
the sample capacitor.
• Because of the high-impedance of VBAT, select
higher sampling time to get an accurate reading.
Since the VBAT pin is connected to the A/D during
sampling, to prolong the VBAT battery life, the
recommendation is to only select the VBAT channel
when needed.
 2015 Microchip Technology Inc.
DS30010089C-page 425
PIC24FJ256GA412/GB412 FAMILY
FIGURE 27-2:
EXAMPLE OF BUFFER ADDRESS GENERATION IN PIA MODE
(4-WORD BUFFERS PER CHANNEL)
A/D Module
(PIA Mode)
BBA
DMABL<2:0> = 010
(16-Word Buffer Size)
Data RAM
Channel
ccccc (0-31)
000 cccc cnn0 (IA)
nn (0-3)
(Buffer Base Address)
Ch 0 Buffer (4 Words)
Ch 1 Buffer (4 Words)
Ch 2 Buffer (4 Words)
Ch 3 Buffer (4 Words)
1000h
1008h
1010h
1018h
Ch 7 Buffer (4 Words)
Ch 8 Buffer (4 Words)
1038h
1040h
Destination
Range
1000h (DMA Base Address)
Ch 29 Buffer (4 Words) 10F0h
Ch 29 Buffer (4 Words) 10F8h
Ch 31 Buffer (4 Words) 1100h
DMADSTn
DMA Channel
Buffer Address
Channel Address
Address Mask
DMA Base Address
Ch 0, Word 0
Ch 0, Word 1
Ch 0, Word 2
Ch 0, Word 3
Ch 1, Word 0
Ch 1, Word 1
Ch 1, Word 2
Ch 1, Word 3
TABLE 27-1:
1000h
1002h
1004h
1006h
1008h
100Ah
100Ch
100Eh
0001
0001
0001
0001
0001
0001
0001
0001
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0010
0100
0110
1000
1010
1100
1110
INDIRECT ADDRESS GENERATION IN PIA MODE
DMABL<2:0>
Buffer Size per
Channel (words)
Generated Offset
Address (lower 11 bits)
Available
Input
Channels
Allowable DMADSTn
Addresses
000
1
000 00cc ccc0
32
xxxx xxxx xx00 0000
001
2
000 0ccc ccn0
32
xxxx xxxx x000 0000
010
4
000 cccc cnn0
32
xxxx xxxx 0000 0000
011
8
00c cccc nnn0
32
xxxx xxx0 0000 0000
100
16
0cc cccn nnn0
32
xxxx xx00 0000 0000
101
32
ccc ccnn nnn0
32
xxxx x000 0000 0000
110
64
ccc cnnn nnn0
16
xxxx x000 0000 0000
111
128
ccc nnnn nnn0
8
xxxx x000 0000 0000
Legend: ccc = Channel number (three to five bits), n = Base buffer address (zero to seven bits),
x = User-definable range of DMADSTn for base address, 0 = Masked bits of DMADSTn for IA.
DS30010089C-page 426
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
27.4
Registers
The 12-bit A/D Converter is controlled through a total of
13 registers:
• AD1CON1 through AD1CON5 (Register 27-1
through Register 27-5)
• AD1CHS (Register 27-6)
• AD1CHITH and AD1CHITL (Register 27-8 and
Register 27-9)
REGISTER 27-1:
• AD1CSSH and AD1CSSL (Register 27-10 and
Register 27-11)
• AD1CTMENH and AD1CTMENL (Register 27-12
and Register 27-13)
• AD1DMBUF (not shown) – The 16-bit conversion
buffer for Extended Buffer mode
In addition, the ANCFG register (Register 27-7)
controls the band gap voltage resources for the A/D
Converter, as well as other modules.
AD1CON1: A/D CONTROL REGISTER 1
R/W-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
ADON
—
ADSIDL
DMABM(1)
DMAEN
MODE12
FORM1
FORM0
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
U-0
R/W-0
R/W-0, HSC
R/C-0, HSC
SSRC3
SSRC2
SSRC1
SSRC0
—
ASAM
SAMP
DONE
bit 7
bit 0
Legend:
C = Clearable bit
U = Unimplemented bit, read as ‘0’
R = Readable bit
W = Writable bit
HSC = Hardware Settable/Clearable bit
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
ADON: A/D Operating Mode bit
1 = A/D Converter module is operating
0 = A/D Converter is off
bit 14
Unimplemented: Read as ‘0’
bit 13
ADSIDL: A/D Stop in Idle Mode bit
1 = Discontinues module operation when device enters Idle mode
0 = Continues module operation in Idle mode
bit 12
DMABM: Extended DMA Buffer Mode Select bit(1)
1 = Extended Buffer mode: Buffer address is defined by the DMADSTn register
0 = PIA mode: Buffer addresses are defined by the DMA Controller and AD1CON4<2:0>
bit 11
DMAEN: Extended DMA/Buffer Enable bit
1 = Extended DMA and buffer features are enabled
0 = Extended features are disabled
bit 10
MODE12: 12-Bit Operation Mode bit
1 = 12-bit A/D operation
0 = 10-bit A/D operation
bit 9-8
FORM<1:0>: Data Output Format bits
11 = Fractional result, signed, left justified
10 = Absolute fractional result, unsigned, left justified
01 = Decimal result, signed, right justified
00 = Absolute decimal result, unsigned, right justified
Note 1:
This bit is only available when Extended DMA/Buffer features are available (DMAEN = 1).
 2015 Microchip Technology Inc.
DS30010089C-page 427
PIC24FJ256GA412/GB412 FAMILY
REGISTER 27-1:
AD1CON1: A/D CONTROL REGISTER 1 (CONTINUED)
bit 7-4
SSRC<3:0>: Sample Clock Source Select bits
1xxx = Unimplemented, do not use
0111 = Internal counter ends sampling and starts conversion (auto-convert); do not use in Auto-Scan mode
0110 = Timer1 (also triggers in Sleep mode)
0101 = Timer1 (does not trigger in Sleep mode)
0100 = CTMU
0011 = Timer5
0010 = Timer3
0001 = INT0
0000 = The SAMP bit must be cleared by software to start conversion
bit 3
Unimplemented: Read as ‘0’
bit 2
ASAM: A/D Sample Auto-Start bit
1 = Sampling begins immediately after the last conversion; SAMP bit is auto-set
0 = Sampling begins when SAMP bit is manually set
bit 1
SAMP: A/D Sample Enable bit
1 = A/D Sample-and-Hold amplifiers are sampling
0 = A/D Sample-and-Hold amplifiers are holding
bit 0
DONE: A/D Conversion Status bit
1 = A/D conversion cycle has completed
0 = A/D conversion cycle has not started or is in progress
Note 1:
This bit is only available when Extended DMA/Buffer features are available (DMAEN = 1).
DS30010089C-page 428
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 27-2:
AD1CON2: A/D CONTROL REGISTER 2
R/W-0
R/W-0
R/W-0
r-0
R/W-0
R/W-0
U-0
U-0
PVCFG1
PVCFG0
NVCFG0
—
BUFREGEN
CSCNA
—
—
bit 15
bit 8
R/W-0
R/W-0
(1)
R/W-0
SMPI4
BUFS
SMPI3
R/W-0
SMPI2
R/W-0
SMPI1
R/W-0
R/W-0
R/W-0
(1)
SMPI0
BUFM
ALTS
bit 7
bit 0
Legend:
r = Reserved bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-14
PVCFG<1:0>: A/D Converter Positive Voltage Reference Configuration bits
1x = Unimplemented, do not use
01 = External VREF+
00 = AVDD
bit 13
NVCFG0: A/D Converter Negative Voltage Reference Configuration bit
1 = External VREF0 = AVSS
bit 12
Reserved: Maintain as ‘0’
bit 11
BUFREGEN: A/D Buffer Register Enable bit
1 = Conversion result is loaded into the buffer location determined by the converted channel
0 = A/D result buffer is treated as a FIFO
bit 10
CSCNA: Scan Input Selections for CH0+ During Sample A bit
1 = Scans inputs
0 = Does not scan inputs
bit 9-8
Unimplemented: Read as ‘0’
bit 7
BUFS: Buffer Fill Status bit(1)
1 = A/D is currently filling ADC1BUF13-ADC1BUF25, user should access data in ADC1BUF0-ADC1BUF12
0 = A/D is currently filling ADC1BUF0-ADC1BUF12, user should access data in ADC1BUF13-ADC1BUF25
bit 6-2
SMPI<4:0>: Interrupt Sample/DMA Increment Rate Select bits
When DMAEN = 1:
11111 = Increments the DMA address after completion of the 32nd sample/conversion operation
11110 = Increments the DMA address after completion of the 31st sample/conversion operation

00001 = Increments the DMA address after completion of the 2nd sample/conversion operation
00000 = Increments the DMA address after completion of each sample/conversion operation
When DMAEN = 0:
11111 = Interrupts at the completion of the conversion for each 32nd sample
11110 = Interrupts at the completion of the conversion for each 31st sample

00001 = Interrupts at the completion of the conversion for every other sample
00000 = Interrupts at the completion of the conversion for each sample
Note 1:
These bits are only applicable when the buffer is used in FIFO mode (BUFREGEN = 0). In addition, BUFS
is only used when BUFM = 1.
 2015 Microchip Technology Inc.
DS30010089C-page 429
PIC24FJ256GA412/GB412 FAMILY
REGISTER 27-2:
AD1CON2: A/D CONTROL REGISTER 2 (CONTINUED)
bit 1
BUFM: Buffer Fill Mode Select bit(1)
1 = Starts buffer filling at ADC1BUF0 on first interrupt and ADC1BUF13 on next interrupt
0 = Always starts filling buffer at ADC1BUF0
bit 0
ALTS: Alternate Input Sample Mode Select bit
1 = Uses channel input selects for Sample A on first sample and Sample B on next sample
0 = Always uses channel input selects for Sample A
Note 1:
These bits are only applicable when the buffer is used in FIFO mode (BUFREGEN = 0). In addition, BUFS
is only used when BUFM = 1.
REGISTER 27-3:
AD1CON3: A/D CONTROL REGISTER 3
R/W-0
R-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
ADRC
EXTSAM
PUMPEN
SAMC4
SAMC3
SAMC2
SAMC1
SAMC0
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
ADCS7
ADCS6
ADCS5
ADCS4
ADCS3
ADCS2
ADCS1
ADCS0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
ADRC: A/D Conversion Clock Source bit
1 = RC clock
0 = Clock derived from system clock
bit 14
EXTSAM: Extended Sampling Time bit
1 = A/D is still sampling after SAMP = 0
0 = A/D is finished sampling
bit 13
PUMPEN: Charge Pump Enable bit
1 = Charge pump for switches is enabled
0 = Charge pump for switches is disabled
bit 12-8
SAMC<4:0>: Auto-Sample Time Select bits
11111 = 31 TAD

00001 = 1 TAD
00000 = 0 TAD
bit 7-0
ADCS<7:0>: A/D Conversion Clock Select bits
11111111 = 256 • TCY = TAD

00000001 = 2•TCY = TAD
00000000 = TCY = TAD
DS30010089C-page 430
x = Bit is unknown
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 27-4:
AD1CON4: A/D CONTROL REGISTER 4
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
U-0
U-0
—
U-0
—
—
U-0
—
U-0
—
R/W-0
DMABL2
R/W-0
(1)
DMABL1
R/W-0
(1)
DMABL0(1)
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-3
Unimplemented: Read as ‘0’
bit 2-0
DMABL<2:0>: DMA Buffer Size Select bits(1)
111 = Allocates 128 words of buffer to each analog input
110 = Allocates 64 words of buffer to each analog input
101 = Allocates 32 words of buffer to each analog input
100 = Allocates 16 words of buffer to each analog input
011 = Allocates 8 words of buffer to each analog input
010 = Allocates 4 words of buffer to each analog input
001 = Allocates 2 words of buffer to each analog input
000 = Allocates 1 word of buffer to each analog input
Note 1:
x = Bit is unknown
The DMABL<2:0> bits are only used when AD1CON1<11> = 1 and AD1CON1<12> = 0; otherwise, their
value is ignored.
 2015 Microchip Technology Inc.
DS30010089C-page 431
PIC24FJ256GA412/GB412 FAMILY
REGISTER 27-5:
AD1CON5: A/D CONTROL REGISTER 5
R/W-0
R/W-0
R/W-0
R/W-0
U-0
U-0
R/W-0
R/W-0
ASEN
LPEN
CTMREQ
BGREQ
—
—
ASINT1
ASINT0
bit 15
bit 8
U-0
U-0
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
—
—
WM1
WM0
CM1
CM0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
ASEN: Auto-Scan Enable bit
1 = Auto-scan is enabled
0 = Auto-scan is disabled
bit 14
LPEN: Low-Power Enable bit
1 = Low power is enabled after scan
0 = Full power is enabled after scan
bit 13
CTMREQ: CTMU Request bit
1 = CTMU is enabled when the A/D is enabled and active
0 = CTMU is not enabled by the A/D
bit 12
BGREQ: Band Gap Request bit
1 = Band gap is enabled when the A/D is enabled and active
0 = Band gap is not enabled by the A/D
bit 11-10
Unimplemented: Read as ‘0’
bit 9-8
ASINT<1:0>: Auto-Scan (Threshold Detect) Interrupt Mode bits
11 = Interrupt after Threshold Detect sequence has completed and valid compare has occurred
10 = Interrupt after valid compare has occurred
01 = Interrupt after Threshold Detect sequence has completed
00 = No interrupt
bit 7-4
Unimplemented: Read as ‘0’
bit 3-2
WM<1:0>: Write Mode bits
11 = Reserved
10 = Auto-compare only (conversion results are not saved, but interrupts are generated when a valid
match occurs, as defined by the CMx and ASINTx bits)
01 = Convert and save (conversion results are saved to locations as determined by the register bits
when a match occurs, as defined by the CMx bits)
00 = Legacy operation (conversion data is saved to a location determined by the buffer register bits)
bit 1-0
CM<1:0>: Compare Mode bits
11 = Outside Window mode (valid match occurs if the conversion result is outside of the window
defined by the corresponding buffer pair)
10 = Inside Window mode (valid match occurs if the conversion result is inside the window defined by
the corresponding buffer pair)
01 = Greater Than mode (valid match occurs if the result is greater than the value in the corresponding
buffer register)
00 = Less Than mode (valid match occurs if the result is less than the value in the corresponding buffer
register)
DS30010089C-page 432
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 27-6:
AD1CHS: A/D SAMPLE SELECT REGISTER
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
CH0NB2
CH0NB1
CH0NB0
CH0SB4
CH0SB3
CH0SB2
CH0SB1
CH0SB0
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
CH0NA2
CH0NA1
CH0NA0
CH0SA4
CH0SA3
CH0SA2
CH0SA1
CH0SA0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-13
CH0NB<2:0>: Sample B Channel 0 Negative Input Select bits
1xx = Unimplemented
011 = Unimplemented
010 = AN1
001 = Unimplemented
000 = VREF-/AVSS
bit 12-8
CH0SB<4:0>: Sample B Channel 0 Positive Input Select bits
See Table 27-2 for available options.
bit 7-5
CH0NA<2:0>: Sample A Channel 0 Negative Input Select bits
Same definitions as for CHONB<2:0>.
bit 4-0
CH0SA<4:0>: Sample A Channel 0 Positive Input Select bits
Same definitions as for CHOSB<4:0>.
TABLE 27-2:
x = Bit is unknown
POSITIVE CHANNEL SELECT OPTIONS (CHOSA<4:0> OR CHOSB<4:0>)
CH0SA<4:0> or
CH0SB<4:0>
Analog Channel
CH0SA<4:0> or
CH0SB<4:0>
Analog Channel
11111
VBAT/2(1)
01111
AN15
11110
11101
AVDD(1)
AVSS(1)
01110
01101
AN14
AN13
11100
11011
VBG(1)
Reserved
01100
01011
AN12
AN11
11010
11001
Reserved
CTMU
01010
01001
AN10
AN9
11000
10111
CTMU Temperature Sensor(2)
AN23(3)
01000
00111
AN8
AN7
10110
10101
AN22(3)
AN21(3)
00110
00101
AN6
AN5
10100
10011
AN20(3)
AN19(3)
00100
00011
AN4
AN3
10010
10001
AN18(3)
AN17(3)
00010
00001
AN2
AN1
00000
10000
AN16(3)
Note 1: These input channels do not have corresponding memory-mapped result buffers.
2: Temperature sensor does not require AD1CTMENL<13> to be set.
3: These channels are not implemented in 64-pin devices.
 2015 Microchip Technology Inc.
AN0
DS30010089C-page 433
PIC24FJ256GA412/GB412 FAMILY
ANCFG: A/D BAND GAP REFERENCE CONFIGURATION(1)
REGISTER 27-7:
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
VBG6USB
VBG2CMP
VBGDAC
VBGAN
VBGADC
VBGEN
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-6
Unimplemented: Read as ‘0’
bit 5
VBG6USB: USB OTG VBG/6 Input Enable bit
1 = Band gap voltage, divided by six reference (VBG/6), is enabled
0 = Band gap voltage, divided by six reference (VBG/6), is disabled
bit 4
VBG2CMP: Comparator VBG/2 Input Enable bit
1 = Band gap voltage, divided by two reference (VBG/2), is enabled
0 = Band gap voltage, divided by two reference (VBG/2), is disabled
bit 3
VBGDAC: DAC Input Band Gap Reference Enable bit
1 = Band gap voltage reference (VBG) is enabled
0 = Band gap voltage reference (VBG) is disabled
bit 2
VBGAN: Analog Module VBG Input Enable bit
1 = Band gap voltage reference (VBG) is enabled
0 = Band gap voltage reference (VBG) is disabled
bit 1
VBGADC: A/D Input VBG Enable bit
1 = Band gap voltage reference (VBG) is enabled
0 = Band gap voltage reference (VBG) is disabled
bit 0
VBGEN: General Resource VBG Enable bit
1 = Band gap voltage reference (VBG) is enabled
0 = Band gap voltage reference (VBG) is disabled
Note 1:
x = Bit is unknown
Band gap references are automatically enabled when their consumer modules request these resources,
and disabled when the modules are disabled or do not require them. The individual control bits permit
manual control of the band gap references.The state of the bits does not necessarily reflect the status of
the associated reference and should not be used as a status flag.
DS30010089C-page 434
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 27-8:
AD1CHITH: A/D SCAN COMPARE HIT REGISTER (HIGH WORD)
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
R/W-0
R/W-0
CHH<25:24>(1)
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
CHH<23:16>
R/W-0
R/W-0
R/W-0
(1)
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-10
Unimplemented: Read as ‘0’
bit 9-0
CHH<25:16>: A/D Compare Hit bits(1)
If CM<1:0> = 11:
1 = A/D Result Buffer n has been written with data or a match has occurred
0 = A/D Result Buffer n has not been written with data
For All Other Values of CM<1:0>:
1 = A match has occurred on A/D Result Channel n
0 = No match has occurred on A/D Result Channel n
Note 1:
These bits are unimplemented in 64-pin devices, read as ‘0’.
REGISTER 27-9:
R/W-0
AD1CHITL: A/D SCAN COMPARE HIT REGISTER (LOW WORD)
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
CHH<15:8>
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
CHH<7:0>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-0
x = Bit is unknown
CHH<15:0>: A/D Compare Hit bits
If CM<1:0> = 11:
1 = A/D Result Buffer n has been written with data or a match has occurred
0 = A/D Result Buffer n has not been written with data
For All Other Values of CM<1:0>:
1 = A match has occurred on A/D Result Channel n
0 = No match has occurred on A/D Result Channel n
 2015 Microchip Technology Inc.
DS30010089C-page 435
PIC24FJ256GA412/GB412 FAMILY
REGISTER 27-10: AD1CSSH: A/D INPUT SCAN SELECT REGISTER (HIGH WORD)
U-0
R/W-0
—
R/W-0
R/W-0
U-0
U-0
—
—
CSS<30:28>
R/W-0
R/W-0
CSS<25:24>
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
(1)
CSS<23:16>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
Unimplemented: Read as ‘0’
bit 14-12
CSS<30:28>: A/D Input Scan Selection bits
1 = Includes corresponding internal channel for input scan
0 = Skips channel for input scan
bit 11-10
Unimplemented: Read as ‘0’
bit 9-8
CSS<25:24>: A/D Input Scan Selection bits
1 = Includes corresponding internal channel for input scan
0 = Skips channel for input scan
bit 7-0
CSS<23:16>: A/D Input Scan Selection bits(1)
1 = Includes corresponding A/D channel for input scan
0 = Skips channel for input scan
bit 10-0
Unimplemented: Read as ‘0’
Note 1:
x = Bit is unknown
These bits are unimplemented in 64-pin devices, read as ‘0’.
REGISTER 27-11: AD1CSSL: A/D INPUT SCAN SELECT REGISTER (LOW WORD)
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
CSS<15:8>
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
CSS<7:0>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-0
x = Bit is unknown
CSS<15:0>: A/D Input Scan Selection bits
1 = Includes corresponding A/D channel for input scan
0 = Skips channel for input scan
DS30010089C-page 436
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 27-12: AD1CTMENH: A/D CTMU ENABLE REGISTER (HIGH WORD)
U-0
R/W-0
—
R/W-0
R/W-0
CTMEN<30:28>
U-0
U-0
—
—
R/W-0
R/W-0
CTMEN<25:24>
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
CTMEN<23:16>(1)
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
Unimplemented: Read as ‘0’
bit 14-12
CTMEN<30:28>: CTMU Enabled During Conversion bits
1 = CTMU is enabled and connected to the selected internal channel during conversion
0 = CTMU is not connected to this channel
bit 11-10
Unimplemented: Read as ‘0’
bit 9-8
CTMEN<25:24>: CTMU Enabled During Conversion bits
1 = CTMU is enabled and connected to the selected internal channel during conversion
0 = CTMU is not connected to this channel
bit 7-0
CTMEN<23:16>: CTMU Enabled During Conversion bits(1)
1 = CTMU is enabled and connected to the selected A/D channel during conversion
0 = CTMU is not connected to this channel
Note 1:
These bits are unimplemented in 64-pin devices, read as ‘0’.
REGISTER 27-13: AD1CTMENL: A/D CTMU ENABLE REGISTER (LOW WORD)
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
CTMEN<15:8>
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
CTMEN<7:0>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15-0
x = Bit is unknown
CTMEN<15:0>: CTMU Enabled During Conversion bits
1 = CTMU is enabled and connected to the selected A/D channel during conversion
0 = CTMU is not connected to this channel
 2015 Microchip Technology Inc.
DS30010089C-page 437
PIC24FJ256GA412/GB412 FAMILY
FIGURE 27-3:
10-BIT A/D CONVERTER ANALOG INPUT MODEL
RIC  250
Rs
VA
ANx
Sampling
Switch
RSS
ILEAKAGE
500 nA
CPIN
RSS  3 k
CHOLD
= 4.4 pF
VSS
Legend: CPIN
= Input Capacitance
VT
= Threshold Voltage
ILEAKAGE = Leakage Current at the pin due to
Various Junctions
RIC
= Interconnect Resistance
RSS
= Sampling Switch Resistance
CHOLD
= Sample/Hold Capacitance (from DAC)
Note: The CPIN value depends on the device package and is not tested. The effect of CPIN is negligible if Rs  5 k.
EQUATION 27-1:
A/D CONVERSION CLOCK PERIOD
TAD = TCY (ADCS + 1)
ADCS =
TAD
TCY
–1
Note: Based on TCY = 2/FOSC; Doze mode and PLL are disabled.
DS30010089C-page 438
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
FIGURE 27-4:
12-BIT A/D TRANSFER FUNCTION
Output Code
(Binary (Decimal))
1111 1111 1111 (4095)
1111 1111 1110 (4094)
0010 0000 0011 (2051)
0010 0000 0010 (2050)
0010 0000 0001 (2049)
0010 0000 0000 (2048)
0001 1111 1111 (2047)
0001 1111 1110 (2046)
0001 1111 1101 (2045)
0000 0000 0001 (1)
 2015 Microchip Technology Inc.
(VINH – VINL)
VR+
4096
4095 * (VR+ – VR-)
VR- +
4096
2048 * (VR+ – VR-)
VR-+
VR- +
4096
0
Voltage Level
VRVR+ – VR-
0000 0000 0000 (0)
DS30010089C-page 439
PIC24FJ256GA412/GB412 FAMILY
FIGURE 27-5:
10-BIT A/D TRANSFER FUNCTION
Output Code
(Binary (Decimal))
11 1111 1111 (1023)
11 1111 1110 (1022)
10 0000 0011 (515)
10 0000 0010 (514)
10 0000 0001 (513)
10 0000 0000 (512)
01 1111 1111 (511)
01 1111 1110 (510)
01 1111 1101 (509)
00 0000 0001 (1)
DS30010089C-page 440
(VINH – VINL)
VR+
1024
1023 * (VR+ – VR-)
VR- +
1024
VR-+
512 * (VR+ – VR-)
1024
VR- +
VR+ – VR-
0
Voltage Level
VR-
00 0000 0000 (0)
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
28.0
10-BIT DIGITAL-TO-ANALOG
CONVERTER (DAC)
Note:
The DAC generates an analog output voltage based on
the digital input code, according to the formula:
VDAC =
This data sheet summarizes the features of
this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to the
“dsPIC33/PIC24 Family Reference Manual”, “10-Bit Digital-to-Analog Converter
(DAC)” (DS39615). The information in this
data sheet supersedes the information in
the FRM.
VDACREF  DACxDAT
1024
where VDAC is the analog output voltage and VDACREF
is the reference voltage selected by DACREF<1:0>.
The DAC includes these features:
• Precision 10-Bit Resistor Ladder for High Accuracy
• Fast Settling Time, Supporting 1 Msps Effective
Sampling Rates
• Buffered Output Voltage
• Three User-Selectable Voltage Reference Options
• Multiple Conversion Trigger Options, Plus a
Manual Convert-on-Write Option
• Left and Right Justified Input Data Options
• User-Selectable Sleep and Idle mode Operation
PIC24FJ256GA412/GB412 family devices include
10-bit Digital-to-Analog Converters (DACs) for generating analog outputs from digital data. A simplified block
diagram for a the DAC is shown in Figure 28-1.
When using the DAC, it is required to set the ANSx and
TRISx bits for the DACx output pin to configure it as an
analog output. See Section 11.2 “Configuring Analog
Port Pins (ANSx)” for more information.
FIGURE 28-1:
DAC SIMPLIFIED BLOCK DIAGRAM
DACSIDL
Idle Mode
DACSLP
Sleep Mode
DACEN
DVREF+
AVDD
VBG
2x Gain Buffer
DACREF<1:0>
DACOE
DACxCON
10
DACxDAT
10-Bit
Resistor
Ladder
Unity Gain
Buffer
DACx Output
Pin
Trigger and
Trigger Sources
Interrupt Logic
DACTRIG
DACTSEL<4:0>
DACxIF
AVss
 2015 Microchip Technology Inc.
DS30010089C-page 441
PIC24FJ256GA412/GB412 FAMILY
REGISTER 28-1:
DAC1CON: DAC CONTROL REGISTER
R/W-0
U-0
R/W-0
R/W-0
R/W-0
U-0
U-0
R/W-0
DACEN
—
DACSIDL
DACSLP
DACFM
—
—
DACTRIG
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
DACOE
DACTSEL4
DACTSEL3
DACTSEL2
DACTSEL1
DACTSEL0
DACREF1
DACREF0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
DACEN: DAC Enable bit
1 = Module is enabled
0 = Module is disabled
bit 14
Unimplemented: Read as ‘0’
bit 13
DACSIDL: DAC Peripheral Stop in Idle Mode bit
1 = Discontinues module operation when device enters Idle mode
0 = Continues module operation in Idle mode
bit 12
DACSLP: DAC Enable Peripheral During Sleep bit
1 = DAC continues to output the most recent value of DACxDAT during Sleep mode
0 = DAC is powered down in Sleep mode; DACx output pin is controlled by the TRISx and LATx bits
bit 11
DACFM: DAC Data Format Select bit
1 = Data is left justified (data stored in DACxDAT<15:6>)
0 = Data is right justified (data stored in DACxDAT<9:0>)
bit 10-9
Unimplemented: Read as ‘0’
bit 8
DACTRIG: DAC Trigger Input Enable bit
1 = Analog output value updates when the event selected by DACTSEL<4:0> occurs
0 = Analog output value updates as soon as DACxDAT is written (DAC trigger is ignored)
bit 7
DACOE: DAC Output Enable bit
1 = Analog output voltage is driven to the DAC pin
0 = Analog output voltage is not available at pin (voltage at pin floats)
Note 1:
The internal band gap reference is automatically enabled whenever the DAC is enabled.
DS30010089C-page 442
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 28-1:
DAC1CON: DAC CONTROL REGISTER (CONTINUED)
bit 6-2
DACTSEL<4:0>: DAC Trigger Source Select bits
11111
...
= Unimplemented
10010
10001 = External Interrupt 1 (INT1)
10000 = SCCP7
01111 = SCCP6
01110 = SCCP5
01101 = SCCP4
01100 = MCCP3
01011 = MCCP2
01010 = MCCP1
01001 = Unimplemented
01000 = Timer5 match
00111 = Timer4 match
00110 = Timer3 match
00101 = Timer2 match
00100 = Timer1 match
00011 = A/D conversion done
00010 = Comparator 3 trigger
00001 = Comparator 2 trigger
00000 = Comparator 1 trigger
bit 1-0
DACREF<1:0>: DAC Reference Source Select bits
11 = 2.4V internal band gap (2 * VBG)(1)
10 = AVDD
01 = DVREF+
00 = Reference is not connected (lowest power but no DAC functionality)
Note 1:
The internal band gap reference is automatically enabled whenever the DAC is enabled.
 2015 Microchip Technology Inc.
DS30010089C-page 443
PIC24FJ256GA412/GB412 FAMILY
NOTES:
DS30010089C-page 444
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
29.0
TRIPLE COMPARATOR
MODULE
Note:
voltage reference input from one of the internal band
gap references or the comparator voltage reference
generator (VBG, VBG/2 and CVREF).
This data sheet summarizes the features of
this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to
the “dsPIC33/PIC24 Family Reference
Manual”, “Scalable Comparator Module”
(DS39734). The information in this data
sheet supersedes the information in the
FRM.
The triple comparator module provides three dual input
comparators. The inputs to the comparator can be
configured to use any one of five external analog inputs
(CxINA, CxINB, CxINC, CxIND and VREF+) and a
FIGURE 29-1:
The comparator outputs may be directly connected to
the CxOUT pins. When the respective COE bit equals
‘1’, the I/O pad logic makes the unsynchronized output
of the comparator available on the pin.
A simplified block diagram of the module in shown in
Figure 29-1. Diagrams of the possible individual
comparator configurations are shown in Figure 29-2.
Each comparator has its own control register,
CMxCON (Register 29-1), for enabling and configuring
its operation. The output and event status of all three
comparators is provided in the CMSTAT register
(Register 29-2).
TRIPLE COMPARATOR MODULE BLOCK DIAGRAM
EVPOL<1:0>
CCH<1:0>
Input
Select
Logic
CxINB
CPOL
VIN00
VIN+
Trigger/Interrupt
Logic
CEVT
COE
C1
01
CxINC
COUT
10
CxIND
00
VBG
11
EVPOL<1:0>
01
VBG/2
CPOL
Trigger/Interrupt
Logic
CEVT
COE
VIN-
11
CVREF+
VIN+
C2
(1)
COUT
CVREFM<1:0>
0
CxINA
CVREF+
CVREF
C1OUT
Pin
1
0
EVPOL<1:0>
+
1
CPOL
VINVIN+
CVREFP(1)
C2OUT
Pin
Trigger/Interrupt
Logic
CEVT
COE
C3
COUT
C3OUT
Pin
CREF
Note 1:
Refer to the CVRCON register (Register 30-1) for bit details.
 2015 Microchip Technology Inc.
DS30010089C-page 445
PIC24FJ256GA412/GB412 FAMILY
FIGURE 29-2:
INDIVIDUAL COMPARATOR CONFIGURATIONS WHEN CREF = 0
Comparator Off
CON = 0, CREF = x, CCH<1:0> = xx
COE
VINVIN+
Cx
Off (Read as ‘0’)
CxOUT
Pin
Comparator CxINB > CxINA Compare
Comparator CxINC > CxINA Compare
CON = 1, CCH<1:0> = 00, CVREFM<1:0> = xx
CON = 1, CCH<1:0> = 01, CVREFM<1:0> = xx
CxINB
CxINA
COE
VINVIN+
CxINC
Cx
CxOUT
Pin
CxINA
COE
VINVIN+
Cx
CxOUT
Pin
Comparator CxIND > CxINA Compare
Comparator VBG > CxINA Compare
CON = 1, CCH<1:0> = 10, CVREFM<1:0> = xx
CON = 1, CCH<1:0> = 11, CVREFM<1:0> = 00
CxIND
CxINA
COE
VINVIN+
VBG
Cx
CxOUT
Pin
CxINA
COE
VINVIN+
Cx
CxOUT
Pin
Comparator VBG > CxINA Compare
Comparator CxIND > CxINA Compare
CON = 1, CCH<1:0> = 11, CVREFM<1:0> = 01
CON = 1, CCH<1:0> = 11, CVREFM<1:0> = 11
VBG/2
CxINA
COE
VINVIN+
DS30010089C-page 446
VREF+
Cx
CxOUT
Pin
CxINA
COE
VINVIN+
Cx
CxOUT
Pin
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
FIGURE 29-3:
INDIVIDUAL COMPARATOR CONFIGURATIONS WHEN CREF = 1 AND CVREFP = 0
Comparator CxINB > CVREF Compare
Comparator CxINC > CVREF Compare
CON = 1, CCH<1:0> = 00, CVREFM<1:0> = xx
CON = 1, CCH<1:0> = 01, CVREFM<1:0> = xx
CxINB
CVREF
COE
VINVIN+
Cx
CxOUT
Pin
COE
VIN-
CxINC
VIN+
CVREF
Cx
CxOUT
Pin
Comparator CxIND > CVREF Compare
Comparator VBG > CVREF Compare
CON = 1, CCH<1:0> = 10, CVREFM<1:0> = xx
CON = 1, CCH<1:0> = 11, CVREFM<1:0> = 00
CxIND
CVREF
COE
VINVIN+
Cx
CxOUT
Pin
COE
VIN-
VBG
VIN+
CVREF
Cx
CxOUT
Pin
Comparator VBG > CVREF Compare
Comparator CxIND > CVREF Compare
CON = 1, CCH<1:0> = 11, CVREFM<1:0> = 01
CON = 1, CCH<1:0> = 11, CVREFM<1:0> = 11
VBG/2
CVREF
COE
VIN-
Cx
VIN+
FIGURE 29-4:
CxOUT
Pin
COE
VIN-
VREF+
VIN+
CVREF
Cx
CxOUT
Pin
INDIVIDUAL COMPARATOR CONFIGURATIONS WHEN CREF = 1 AND CVREFP = 1
Comparator CxINB > CVREF Compare
Comparator CxINC > CVREF Compare
CON = 1, CCH<1:0> = 00, CVREFM<1:0> = xx
CON = 1, CCH<1:0> = 01, CVREFM<1:0> = xx
CxINB
VREF+
COE
VINVIN+
Cx
CxOUT
Pin
COE
VIN-
CxINC
VIN+
VREF+
Cx
CxOUT
Pin
Comparator CxIND > CVREF Compare
Comparator VBG > CVREF Compare
CON = 1, CCH<1:0> = 10, CVREFM<1:0> = xx
CON = 1, CCH<1:0> = 11, CVREFM<1:0> = 00
CxIND
VREF+
COE
VINVIN+
Cx
CxOUT
Pin
COE
VIN-
VBG
VIN+
VREF+
Cx
CxOUT
Pin
Comparator VBG > CVREF Compare
CON = 1, CCH<1:0> = 11, CVREFM<1:0> = 01
VBG/2
VREF+
 2015 Microchip Technology Inc.
COE
VINVIN+
Cx
CxOUT
Pin
DS30010089C-page 447
PIC24FJ256GA412/GB412 FAMILY
REGISTER 29-1:
CMxCON: COMPARATOR x CONTROL REGISTERS
(COMPARATORS 1 THROUGH 3)
R/W-0
R/W-0
R/W-0
U-0
U-0
U-0
R/W-0, HS
R-0, HSC
CON
COE
CPOL
—
—
—
CEVT
COUT
bit 15
bit 8
R/W-0
R/W-0
U-0
R/W-0
U-0
U-0
R/W-0
R/W-0
EVPOL1
EVPOL0
—
CREF
—
—
CCH1
CCH0
bit 7
bit 0
Legend:
HS = Hardware Settable bit
HSC = Hardware Settable/Clearable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
CON: Comparator Enable bit
1 = Comparator is enabled
0 = Comparator is disabled
bit 14
COE: Comparator Output Enable bit
1 = Comparator output is present on the CxOUT pin
0 = Comparator output is internal only
bit 13
CPOL: Comparator Output Polarity Select bit
1 = Comparator output is inverted
0 = Comparator output is not inverted
bit 12-10
Unimplemented: Read as ‘0’
bit 9
CEVT: Comparator Event bit
1 = Comparator event that is defined by EVPOL<1:0> has occurred; subsequent triggers and interrupts
are disabled until the bit is cleared
0 = Comparator event has not occurred
bit 8
COUT: Comparator Output bit
When CPOL = 0:
1 = VIN+ > VIN0 = VIN+ < VINWhen CPOL = 1:
1 = VIN+ < VIN0 = VIN+ > VIN-
bit 7-6
EVPOL<1:0>: Trigger/Event/Interrupt Polarity Select bits
11 = Trigger/event/interrupt is generated on any change of the comparator output (while CEVT = 0)
10 = Trigger/event/interrupt is generated on transition of the comparator output:
If CPOL = 0 (non-inverted polarity):
High-to-low transition only.
If CPOL = 1 (inverted polarity):
Low-to-high transition only.
01 = Trigger/event/interrupt is generated on transition of the comparator output:
If CPOL = 0 (non-inverted polarity):
Low-to-high transition only.
If CPOL = 1 (inverted polarity):
High-to-low transition only.
00 = Trigger/event/interrupt generation is disabled
bit 5
Unimplemented: Read as ‘0’
DS30010089C-page 448
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 29-1:
bit 4
CMxCON: COMPARATOR x CONTROL REGISTERS
(COMPARATORS 1 THROUGH 3) (CONTINUED)
CREF: Comparator Reference Select bit (non-inverting input)
1 = Non-inverting input connects to the internal CVREF voltage
0 = Non-inverting input connects to the CxINA pin
bit 3-2
Unimplemented: Read as ‘0’
bit 1-0
CCH<1:0>: Comparator Channel Select bits
11 = Inverting input of the comparator connects to the internal selectable reference voltage specified
by the CVREFM<1:0> bits in the CVRCON register
10 = Inverting input of the comparator connects to the CxIND pin
01 = Inverting input of the comparator connects to the CxINC pin
00 = Inverting input of the comparator connects to the CxINB pin
REGISTER 29-2:
CMSTAT: COMPARATOR MODULE STATUS REGISTER
R/W-0
U-0
U-0
U-0
U-0
R-0, HSC
R-0, HSC
R-0, HSC
CMIDL
—
—
—
—
C3EVT
C2EVT
C1EVT
bit 15
bit 8
U-0
U-0
U-0
U-0
U-0
R-0, HSC
R-0, HSC
R-0, HSC
—
—
—
—
—
C3OUT
C2OUT
C1OUT
bit 7
bit 0
Legend:
HSC = Hardware Settable/Clearable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
CMIDL: Comparator Stop in Idle Mode bit
1 = Discontinues operation of all comparators when device enters Idle mode
0 = Continues operation of all enabled comparators in Idle mode
bit 14-11
Unimplemented: Read as ‘0’
bit 10
C3EVT: Comparator 3 Event Status bit (read-only)
Shows the current event status of Comparator 3 (CM3CON<9>).
bit 9
C2EVT: Comparator 2 Event Status bit (read-only)
Shows the current event status of Comparator 2 (CM2CON<9>).
bit 8
C1EVT: Comparator 1 Event Status bit (read-only)
Shows the current event status of Comparator 1 (CM1CON<9>).
bit 7-3
Unimplemented: Read as ‘0’
bit 2
C3OUT: Comparator 3 Output Status bit (read-only)
Shows the current output of Comparator 3 (CM3CON<8>).
bit 1
C2OUT: Comparator 2 Output Status bit (read-only)
Shows the current output of Comparator 2 (CM2CON<8>).
bit 0
C1OUT: Comparator 1 Output Status bit (read-only)
Shows the current output of Comparator 1 (CM1CON<8>).
 2015 Microchip Technology Inc.
DS30010089C-page 449
PIC24FJ256GA412/GB412 FAMILY
NOTES:
DS30010089C-page 450
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
30.0
Note:
COMPARATOR VOLTAGE
REFERENCE
30.1
This data sheet summarizes the features of
this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to
the “dsPIC33/PIC24 Family Reference
Manual”, “Dual Comparator Module”
(DS39710). The information in this data
sheet supersedes the information in the
FRM.
FIGURE 30-1:
CVREF+
AVDD
Configuring the Comparator
Voltage Reference
The comparator voltage reference module is controlled
through the CVRCON register (Register 30-1). The
comparator voltage reference provides a range of output
voltages with 32 distinct levels. The comparator reference supply voltage can come from either VDD and VSS
or the external CVREF+ and CVREF- pins. The voltage
source is selected by the CVRSS bit (CVRCON<5>).
The settling time of the comparator voltage reference
must be considered when changing the CVREF output.
COMPARATOR VOLTAGE REFERENCE BLOCK DIAGRAM
CVRSS = 1
CVRSS = 0
CVR<4:0>
R
CVREN
R
R
32 Steps
R
R
R
CVREF-
32-to-1 MUX
R
CVREF
CVROE
CVREF
Pin
CVRSS = 1
CVRSS = 0
AVSS
 2015 Microchip Technology Inc.
DS30010089C-page 451
PIC24FJ256GA412/GB412 FAMILY
REGISTER 30-1:
CVRCON: COMPARATOR VOLTAGE REFERENCE CONTROL REGISTER
U-0
U-0
U-0
U-0
U-0
R/W-0
R/W-0
R/W-0
—
—
—
—
—
CVREFP
CVREFM1
CVREFM0
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
CVREN
CVROE
CVRSS
CVR4
CVR3
CVR2
CVR1
CVR0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-11
Unimplemented: Read as ‘0’
bit 10
CVREFP: Comparator Voltage Reference Select bit (valid only when CREF is ‘1’)
1 = VREF+ is used as a reference voltage to the comparators
0 = The CVR<4:0> bits (5-bit DAC) within this module provide the reference voltage to the comparators
bit 9-8
CVREFM<1:0>: Comparator Voltage Band Gap Reference Source Select bits
(valid only when CCH<1:0> = 11)
00 = Band gap voltage is provided as an input to the comparators
01 = Band gap voltage, divided by two, is provided as an input to the comparators
10 = Reserved
11 = VREF+ pin is provided as an input to the comparators
bit 7
CVREN: Comparator Voltage Reference Enable bit
1 = CVREF circuit is powered on
0 = CVREF circuit is powered down
bit 6
CVROE: Comparator VREF Output Enable bit
1 = CVREF voltage level is output on the CVREF pin
0 = CVREF voltage level is disconnected from the CVREF pin
bit 5
CVRSS: Comparator VREF Source Selection bit
1 = Comparator reference source, CVRSRC = VREF+ – VREF0 = Comparator reference source, CVRSRC = AVDD – AVSS
bit 4-0
CVR<4:0>: Comparator VREF Value Selection bits
CVREF = (CVR<4:0>/32) • (CVRSRC)
DS30010089C-page 452
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
31.0
Note:
CHARGE TIME
MEASUREMENT UNIT (CTMU)
This data sheet summarizes the features of
this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information on the
Charge Time Measurement Unit, refer to
the “dsPIC33/PIC24 Family Reference
Manual”, “Charge Time Measurement
Unit (CTMU) with Threshold Detect”
(DS39743).
The Charge Time Measurement Unit (CTMU) is a flexible analog module that provides charge measurement,
accurate differential time measurement between pulse
sources and asynchronous pulse generation. Its key
features include:
•
•
•
•
Thirteen External Edge Input Trigger Sources
Polarity Control for Each Edge Source
Control of Edge Sequence
Control of Response to Edge Levels or Edge
Transitions
• Time Measurement Resolution of
One Nanosecond
• Accurate Current Source Suitable for Capacitive
Measurement
Together with other on-chip analog modules, the CTMU
can be used to precisely measure time, measure
capacitance, measure relative changes in capacitance
or generate output pulses that are independent of the
system clock. The CTMU module is ideal for interfacing
with capacitive-based touch sensors.
31.1
Measuring Capacitance
The CTMU module measures capacitance by generating
an output pulse, with a width equal to the time between
edge events, on two separate input channels. The pulse
edge events to both input channels can be selected from
four sources: two internal peripheral modules (OC1 and
Timer1) and up to 13 external pins (CTED1 through
CTED13). This pulse is used with the module’s precision
current source to calculate capacitance according to the
relationship:
EQUATION 31-1:
I=C•
dV
dT
For capacitance measurements, the A/D Converter
samples an External Capacitor (CAPP) on one of its
input channels after the CTMU output’s pulse. A
Precision Resistor (RPR) provides current source
calibration on a second A/D channel. After the pulse
ends, the converter determines the voltage on the
capacitor. The actual calculation of capacitance is
performed in software by the application.
Figure 31-1 illustrates the external connections used
for capacitance measurements and how the CTMU and
A/D modules are related in this application. This
example also shows the edge events coming from
Timer1, but other configurations using external edge
sources are possible. A detailed discussion on
measuring capacitance and time with the CTMU
module is provided in the “dsPIC33/PIC24 Family Reference Manual”, “Charge Time Measurement Unit
(CTMU) with Threshold Detect” (DS39743).
The CTMU is controlled through three registers:
CTMUCON1L, CTMUCON1H and CTMUCON2L.
CTMUCON1L enables the module and controls the
mode of operation of the CTMU, edge sequencing and
current source control. CTMUCON1H controls edge
source selection and edge source polarity selection. The
CTMUCON2L register controls the reset and discharge
of the current source.
 2015 Microchip Technology Inc.
DS30010089C-page 453
PIC24FJ256GA412/GB412 FAMILY
FIGURE 31-1:
TYPICAL CONNECTIONS AND INTERNAL CONFIGURATION FOR
CAPACITANCE MEASUREMENT
PIC24F Device
Timer1
CTMU
EDG1
Current Source
EDG2
Output Pulse
A/D Converter
ANx
ANy
CAPP
31.2
RPR
Measuring Time
Time measurements on the pulse width can be similarly
performed using the A/D module’s Internal Capacitor
(CAD) and a precision resistor for current calibration.
Figure 31-2 displays the external connections used for
time measurements, and how the CTMU and A/D
modules are related in this application. This example
FIGURE 31-2:
also shows both edge events coming from the external
CTEDx pins, but other configurations using internal
edge sources are possible.
TYPICAL CONNECTIONS AND INTERNAL CONFIGURATION FOR TIME
MEASUREMENT
PIC24F Device
CTMU
CTEDx
EDG1
CTEDx
EDG2
Current Source
Output Pulse
ANx
A/D Converter
CAD
RPR
DS30010089C-page 454
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
31.3
Pulse Generation and Delay
Figure 31-3 illustrates the external connections for
pulse generation, as well as the relationship of the
different analog modules required. While CTED1 is
shown as the input pulse source, other options are
available. A detailed discussion on pulse generation
with the CTMU module is provided in the “dsPIC33/
PIC24 Family Reference Manual”.
The CTMU module can also generate an output pulse
with edges that are not synchronous with the device’s
system clock. More specifically, it can generate a pulse
with a programmable delay from an edge event input to
the module.
When the module is configured for pulse generation
delay by setting the TGEN bit (CTMUCON1L<12>), the
internal current source is connected to the B input of
Comparator 2. A Capacitor (CDELAY) is connected to
the Comparator 2 pin, C2INB, and the Comparator
Voltage Reference, CVREF, is connected to C2INA.
CVREF is then configured for a specific trip point. The
module begins to charge CDELAY when an edge event
is detected. When CDELAY charges above the CVREF
trip point, a pulse is output on CTPLS. The length of the
pulse delay is determined by the value of CDELAY and
the CVREF trip point.
FIGURE 31-3:
TYPICAL CONNECTIONS AND INTERNAL CONFIGURATION FOR PULSE
DELAY GENERATION
PIC24F Device
CTEDx
EDG1
CTMU
CTPLS
Current Source
Comparator
C2INB
CDELAY
 2015 Microchip Technology Inc.
–
C2
CVREF
DS30010089C-page 455
PIC24FJ256GA412/GB412 FAMILY
REGISTER 31-1:
CTMUCON1L: CTMU CONTROL 1 LOW REGISTER
R/W-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
CTMUEN
—
CTMUSIDL
TGEN
EDGEN
EDGSEQEN
IDISSEN
CTTRIG
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
ITRIM5
ITRIM4
ITRIM3
ITRIM2
ITRIM1
ITRIM0
IRNG1
IRNG0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 15
CTMUEN: CTMU Enable bit
1 = Module is enabled
0 = Module is disabled
bit 14
Unimplemented: Read as ‘0’
bit 13
CTMUSIDL: CTMU Stop in Idle Mode bit
1 = Discontinues module operation when device enters Idle mode
0 = Continues module operation in Idle mode
bit 12
TGEN: Time Generation Enable bit
1 = Enables edge delay generation
0 = Disables edge delay generation
bit 11
EDGEN: Edge Enable bit
1 = Edges are not blocked
0 = Edges are blocked
bit 10
EDGSEQEN: Edge Sequence Enable bit
1 = Edge 1 event must occur before Edge 2 event can occur
0 = No edge sequence is needed
bit 9
IDISSEN: Analog Current Source Control bit
1 = Analog current source output is grounded
0 = Analog current source output is not grounded
bit 8
CTTRIG: CTMU Trigger Control bit
1 = Trigger output is enabled
0 = Trigger output is disabled
bit 7-2
ITRIM<5:0>: Current Source Trim bits
011111 = Maximum positive change from nominal current
011110
...
000001 = Minimum positive change from nominal current
000000 = Nominal current output specified by IRNG<1:0>
111111 = Minimum negative change from nominal current
...
100010
100001 = Maximum negative change from nominal current
bit 1-0
IRNG<1:0>: Current Source Range Select bits
11 = 100 × Base Current
10 = 10 × Base Current
01 = Base current level (0.55 A nominal)
00 = 1000 × Base Current
DS30010089C-page 456
x = Bit is unknown
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 31-2:
CTMUCON1H: CTMU CONTROL 1 HIGH REGISTER
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
EDG1MOD
EDG1POL
EDG1SEL3
EDG1SEL2
EDG1SEL1
EDG1SEL0
EDG2STAT
EDG1STAT
bit 15
bit 8
R/W-0
EDG2MOD
R/W-0
R/W-0
EDG2POL
EDG2SEL3
R/W-0
EDG2SEL2
R/W-0
EDG2SEL1
R/W-0
U-0
U-0
EDG2SEL0
—
—
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
EDG1MOD: Edge 1 Edge-Sensitive Select bit
1 = Input is edge-sensitive
0 = Input is level-sensitive
bit 14
EDG1POL: Edge 1 Polarity Select bit
1 = Edge 1 is programmed for a positive edge response
0 = Edge 1 is programmed for a negative edge response
bit 13-10
EDG1SEL<3:0>: Edge 1 Source Select bits
1111 = Comparator 3 output
1110 = Comparator 2 output
1101 = Comparator 1 output
1100 = IC3
1011 = IC2
1010 = IC1
1001 = CTED8
1000 = CTED7
0111 = CTED6
0110 = CTED5
0101 = CTED4
0100 = CTED3
0011 = CTED1
0010 = CTED2
0001 = OC1
0000 = Timer1 match
bit 9
EDG2STAT: Edge 2 Status bit
Indicates the status of Edge 2 and can be written to control current source.
1 = Edge 2 has occurred
0 = Edge 2 has not occurred
bit 8
EDG1STAT: Edge 1 Status bit
Indicates the status of Edge 1 and can be written to control current source.
1 = Edge 1 has occurred
0 = Edge 1 has not occurred
bit 7
EDG2MOD: Edge 2 Edge-Sensitive Select bit
1 = Input is edge-sensitive
0 = Input is level-sensitive
bit 6
EDG2POL: Edge 2 Polarity Select bit
1 = Edge 2 is programmed for a positive edge response
0 = Edge 2 is programmed for a negative edge response
 2015 Microchip Technology Inc.
DS30010089C-page 457
PIC24FJ256GA412/GB412 FAMILY
REGISTER 31-2:
CTMUCON1H: CTMU CONTROL 1 HIGH REGISTER (CONTINUED)
bit 5-2
EDG2SEL<3:0>: Edge 2 Source Select bits
1111 = Comparator 3 output
1110 = Comparator 2 output
1101 = Comparator 1 output
1100 = System clock
1011 = IC3
1010 = IC2
1001 = IC1
1000 = CTED13
0111 = CTED12
0110 = CTED11
0101 = CTED10
0100 = CTED9
0011 = CTED1
0010 = CTED2
0001 = OC1
0000 = Timer1 match
bit 1-0
Unimplemented: Read as ‘0’
DS30010089C-page 458
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 31-3:
CTMUCON2L: CTMU CONTROL 2 LOW REGISTER
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
U-0
U-0
U-0
R/W-0
U-0
R/W-0
R/W-0
R/W-0
—
—
—
IRSTEN
—
DSCH2
DSCH1
DSCH0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-5
Unimplemented: Read as ‘0’
bit 4
IRSTEN: Current Source Reset Enable bit
1 = Current source is reset by the IDISSEN bit or by a source selected by DSCH<2:0>
0 = Edge detect logic does not occur
bit 3
Unimplemented: Read as ‘0’
bit 2-0
DSCH<2:0>: Discharge Trigger Source Select bits
111 = CLC2 output
110 = CLC1 output
101 = Unimplemented
100 = A/D end of conversion event
011 = SCCP5 auxiliary output
010 = MCCP2 auxiliary output
001 = MCCP1 auxiliary output
000 = Unimplemented
 2015 Microchip Technology Inc.
DS30010089C-page 459
PIC24FJ256GA412/GB412 FAMILY
NOTES:
DS30010089C-page 460
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
32.0
HIGH/LOW-VOLTAGE DETECT
(HLVD)
Note:
An interrupt flag is set if the device experiences an
excursion past the trip point in the direction of change.
If the interrupt is enabled, the program execution will
branch to the interrupt vector address and the software
can then respond to the interrupt.
This data sheet summarizes the features of
this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information on the
High/Low-Voltage Detect, refer to the
“dsPIC33/PIC24
Family
Reference
Manual”, “High-Level Integration with
Programmable High/Low-Voltage Detect
(HLVD)” (DS39725).
The HLVD Control register (see Register 32-1)
completely controls the operation of the HLVD module.
This allows the circuitry to be “turned off” by the user
under software control, which minimizes the current
consumption for the device.
The High/Low-Voltage Detect (HLVD) module is a
programmable circuit that allows the user to specify
both the device voltage trip point and the direction of
change.
FIGURE 32-1:
VDD
HIGH/LOW-VOLTAGE DETECT (HLVD) MODULE BLOCK DIAGRAM
Externally Generated
Trip Point
VDD
LVDIN
HLVDL<3:0>
16-to-1 MUX
HLVDEN
VDIR
Set
HLVDIF
Internal Voltage
Reference
1.20V Typical
HLVDEN
 2015 Microchip Technology Inc.
DS30010089C-page 461
PIC24FJ256GA412/GB412 FAMILY
REGISTER 32-1:
HLVDCON: HIGH/LOW-VOLTAGE DETECT CONTROL REGISTER
R/W-0
U-0
R/W-0
U-0
U-0
U-0
U-0
U-0
HLVDEN
—
LSIDL
—
—
—
—
—
bit 15
bit 8
R/W-0
R/W-0
R/W-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
VDIR
BGVST
IRVST
—
HLVDL3
HLVDL2
HLVDL1
HLVDL0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15
HLVDEN: High/Low-Voltage Detect Power Enable bit
1 = HLVD is enabled
0 = HLVD is disabled
bit 14
Unimplemented: Read as ‘0’
bit 13
LSIDL: HLVD Stop in Idle Mode bit
1 = Discontinues module operation when device enters Idle mode
0 = Continues module operation in Idle mode
bit 12-8
Unimplemented: Read as ‘0’
bit 7
VDIR: Voltage Change Direction Select bit
1 = Event occurs when voltage equals or exceeds trip point (HLVDL<3:0>)
0 = Event occurs when voltage equals or falls below trip point (HLVDL<3:0>)
bit 6
BGVST: Band Gap Voltage Stable Flag bit
1 = Indicates that the band gap voltage is stable
0 = Indicates that the band gap voltage is unstable
bit 5
IRVST: Internal Reference Voltage Stable Flag bit
1 = Internal reference voltage is stable; the High-Voltage Detect logic generates the interrupt flag at the
specified voltage range
0 = Internal reference voltage is unstable; the High-Voltage Detect logic will not generate the interrupt
flag at the specified voltage range and the HLVD interrupt should not be enabled
bit 4
Unimplemented: Read as ‘0’
bit 3-0
HLVDL<3:0>: High/Low-Voltage Detection Limit bits
1111 = External analog input is used (input comes from the LVDIN pin)
1110 = Trip Point 1(1)
1101 = Trip Point 2(1)
1100 = Trip Point 3(1)
•
•
•
0100 = Trip Point 11(1)
00xx = Unused
Note 1:
For the actual trip point, see Section 36.0 “Electrical Characteristics”.
DS30010089C-page 462
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
33.0
Note:
SPECIAL FEATURES
This data sheet summarizes the features of
this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to the
following sections in the “dsPIC33/PIC24
Reference Manual”. The information in this
data sheet supersedes the information in
the FRMs.
• “Watchdog Timer (WDT)”
(DS39697)
• “High-Level Device Integration”
(DS39719)
• “Programming and Diagnostics”
(DS39716)
• “CodeGuard™ Intermediate
Security” (DS70005182)
PIC24FJ256GA412/GB412 family devices include several features intended to maximize application flexibility
and reliability, and minimize cost through elimination of
external components. These are:
•
•
•
•
•
•
Flexible Configuration
Watchdog Timer (WDT)
Code Protection
JTAG Boundary Scan Interface
In-Circuit Serial Programming™
In-Circuit Emulation
33.1
33.1.1
In PIC24FJ256GA412/GB412 family devices, most of
the Configuration Words are implemented as volatile
memory. This means that configuration data must be
programmed each time the device is powered up. The
configuration data is automatically loaded from the
Flash Configuration Words to the proper Configuration
registers during device Resets.
Note:
Table 33-1 lists the Configuration register address
ranges for each device in Single and Dual Partition
Flash modes. A detailed explanation of the various bit
functions is provided in Register 33-1 through
Register 33-12.
 2015 Microchip Technology Inc.
Configuration data is reloaded on all types
of device Resets.
When creating applications for these devices, users
should always specifically allocate the location of the
Flash Configuration Word for configuration data. This is
to make certain that program code is not stored in this
address when the code is compiled.
The upper byte of all Configuration Words in program
memory should always be ‘0000 0000’. This makes
them appear to be NOP instructions in the remote event
that their locations are ever executed by accident.
Since Configuration bits are not implemented in the
corresponding locations, writing ‘0’s to these locations
has no effect on device operation.
Note:
Configuration Bits
The Flash Configuration Words are stored in the last
page location of implemented program memory. Their
bits can be programmed (read as ‘0’), or left
unprogrammed (read as ‘1’), to select various device
configurations. There are two types of Configuration
bits: system operation bits and code-protect bits. The
system operation bits determine the power-on settings
for system-level components, such as the oscillator
and the Watchdog Timer. The code-protect bits prevent
program memory from being read and written.
CONSIDERATIONS FOR
CONFIGURING
PIC24FJ256GA412/GB412 FAMILY
DEVICES
33.1.2
Performing a page erase operation on the
last page of program memory clears the
Flash Configuration Words, enabling code
protection as a result. Therefore, users
should avoid performing page erase
operations on the last page of program
memory.
FBOOT
Unlike the Configuration Words, the FBOOT register is
not implemented as volatile Flash memory. It is located
away from the other Flash Configuration Words, at a constant address for all devices outside of the program
memory space. Device Resets do not affect its contents.
Note that the address for FBOOT, 801800h, belongs to
the configuration memory space (800000h-FFFFFFh),
which can only be accessed using Table Reads and
Table Writes.
DS30010089C-page 463
PIC24FJ256GA412/GB412 FAMILY
TABLE 33-1:
CONFIGURATION WORD ADDRESSES
Single Partition Flash Mode
Configuration
Register
PIC24FJ256GX4XX
PIC24FJ128GX4XX
PIC24FJ64GX4XX
FSEC
02AF80h
015780h
00AF80h
FBSLIM
02AF90h
015790h
00AF90h
FSIGN
02AF94h
015794h
00AF94h
FOSCSEL
02AF98h
015798h
00AF98h
FOSC
02AF9Ch
01579Ch
00AF9Ch
FWDT
02AFA0h
0157A0h
00AFA0h
FPOR
02AFA4h
0157A4h
00AFA4h
FICD
02AFA8h
0157A8h
00AFA8h
FDS
02AFACh
0157ACh
00AFACh
FDEVOPT1
02AFB0h
0157B0h
00AFB0h
FBOOT
801800h
Dual Partition Flash Modes(1)
FSEC(2)
015780h/415780h
00AB80h/40AB80h
005580h/405580h
FBSLIM(2)
015790h/415790h
00AB90h/40AB90h
005590h/405590h
FSIGN(2)
015794h/415794h
00AB94h/40AB94h
005594h/405594h
FOSCSEL
015798h/415798h
00AB98h/40AB98h
005598h/405598h
FOSC
01579Ch/41579Ch
00AB9Ch/40AB9Ch
00559Ch/40559Ch
FWDT
0157A0h/4157A0h
00ABA0h/40ABA0h
0055A0h/4055A0h
FPOR
0157A4h/4157A4h
00ABA4h/40ABA4h
0055A4h/4055A4h
FICD
0157A8h/4157A8h
00ABA8h/40ABA8h
0055A8h/4055A8h
FDS
0157ACh/4157ACh
00ABACh/40ABACh
0055ACh/4055ACh
FDEVOPT1
0157B0h/4157B0h
00ABB0h/40ABB0h
0055B0h/4055B0h
FBTSEQ
0157FCh/4157FCh
00ABFCh/40ABFCh
0055FCh/4055FCh
FBOOT
Note 1:
2:
801800h
Addresses shown for Dual Partition modes are for the Active/Inactive Partitions, respectively.
Changes to these Inactive Partition Configuration Words affect how the Active Partition accesses the
Inactive Partition.
DS30010089C-page 464
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 33-1:
FSEC: SECURITY CONFIGURATION WORD
U-1
U-1
U-1
U-1
U-1
U-1
U-1
U-1
—
—
—
—
—
—
—
—
bit 23
bit 16
R/PO-1
U-1
U-1
U-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
AIVTDIS
—
—
—
CSS2
CSS1
CSS0
CWRP
bit 15
bit 8
R/PO-1
R/PO-1
R/PO-1
U-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
GSS1
GSS0
GWRP
—
BSEN
BSS1
BSS0
BWRP
bit 7
bit 0
Legend:
PO = Program Once bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 23-16
Unimplemented: Read as ‘1’
bit 15
AIVTDIS: Alternate Interrupt Vector Table (AIVT) Enable bit
1 = AIVT is disabled; the ALTIVT bit (INTCON2<8>) is also unavailable
0 = AIVT is enabled and may be selectively enabled in software by the ALTIVT bit
bit 14-12
Unimplemented: Read as ‘1’
bit 11-9
CSS<2:0>: Configuration Segment Memory Code Protection bits
111 = No security other than write protection (configured by the CWRP Configuration bit)
110 = Standard security
10x = Enhanced security
0xx = High security
bit 8
CWRP: Configuration Segment (CS) Flash Write Protection bit
1 = Writes to CS (last page of Flash program memory) memory are allowed
0 = Writes to CS are not allowed
bit 7-6
GSS<1:0>: General Segment (GS) Program Memory Code Protection bits
11 = No security other than write protection (configured by the GWRP Configuration bit)
10 = Standard security
0x = High security
bit 5
GWRP: General Segment Code Flash Write Protection bit
1 = Writes to program memory are allowed
0 = Writes to program memory are not allowed
bit 4
Unimplemented: Read as ‘1’
bit 3
BSEN: Boot Segment (BS) Enable bit
1 = Boot Segment is not instantiated
0 = Boot Segment is instantiated with a size determined by FBSLIM<12:0>
bit 2-1
BSS<1:0>: Boot Segment Program Memory Code Protection bits
11 = No security other than write protection (configured by the BWRP Configuration bit)
10 = Standard security
0x = High security
bit 0
BWRP: Boot Segment Code Flash Write Protection bit
1 = Writes to BS are allowed
0 = Writes to BS are not allowed
 2015 Microchip Technology Inc.
DS30010089C-page 465
PIC24FJ256GA412/GB412 FAMILY
REGISTER 33-2:
FBSLIM: BOOT SEGMENT LIMIT CONFIGURATION WORD
U-1
U-1
U-1
U-1
U-1
U-1
U-1
U-1
—
—
—
—
—
—
—
—
bit 23
bit 16
U-1
U-1
U-1
—
—
—
R/PO-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
BSLIM<12:8>
bit 15
bit 8
R/PO-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
BSLIM<7:0>
bit 7
bit 0
Legend:
PO = Program Once bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 23-13
Unimplemented: Read as ‘1’
bit 12-0
BSLIM<12:0>: Boot Segment Upper Address Limit bits
Defines the address of the last page of the Boot Segment plus 1, when the Boot Segment is instantiated
(BSEN = 0). The stored value is the inverse of the actual address value.
REGISTER 33-3:
FSIGN: SIGNATURE CONFIGURATION WORD
U-1
U-1
U-1
U-1
U-1
U-1
U-1
U-1
—
—
—
—
—
—
—
—
bit 23
bit 16
r-x
U-1
U-1
U-1
U-1
U-1
U-1
U-1
—
—
—
—
—
—
—
—
bit 15
bit 8
U-1
U-1
U-1
U-1
U-1
U-1
U-1
U-1
—
—
—
—
—
—
—
—
bit 7
bit 0
Legend:
r = Reserved bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 23-16
Unimplemented: Read as ‘1’
bit 15
Reserved: The value is unknown; program as ‘0’
bit 14-0
Unimplemented: Read as ‘1’
DS30010089C-page 466
x = Bit is unknown
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 33-4:
FOSCSEL: OSCILLATOR SELECT CONFIGURATION WORD
U-1
U-1
U-1
U-1
U-1
U-1
U-1
U-1
—
—
—
—
—
—
—
—
bit 23
bit 16
U-1
U-1
U-1
U-1
U-1
U-1
U-1
U-1
—
—
—
—
—
—
—
—
bit 15
bit 8
R/PO-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
IESO
PLLMODE3
PLLMODE2
PLLMODE1
PLLMODE0
FNOSC2
FNOSC1
FNOSC0
bit 7
bit 0
Legend:
PO = Program Once bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 23-8
Unimplemented: Read as ‘1’
bit 7
IESO: Internal External Switchover bit
1 = IESO mode (Two-Speed Start-up) is enabled
0 = IESO mode (Two-Speed Start-up) is disabled
bit 6-3
PLLMODE<3:0:> PLL Block Mode Select bits
1111 = PLL is disabled
1110 = Fixed PLL is selected, 8x operation
1101 = Fixed PLL is selected, 6x operation
1100 = Fixed PLL is selected, 4x operation
10xx = Reserved, do not use
0111 = 96 MHz PLL is selected; oscillator input multiplied by 2 (48 MHz input)
0110 = 96 MHz PLL is selected; oscillator input multiplied by 3 (32 MHz input)
0101 = 96 MHz PLL is selected; oscillator input multiplied by 4 (24 MHz input)
0100 = 96 MHz PLL is selected; oscillator input multiplied by 4.8 (20 MHz input)
0011 = 96 MHz PLL is selected; oscillator input multiplied by 6 (16 MHz input)
0010 = 96 MHz PLL is selected; oscillator input multiplied by 8 (12 MHz input)
0001 = 96 MHz PLL is selected; oscillator input multiplied by 12 (8 MHz input)
0000 = 96 MHz PLL is selected; oscillator input multiplied by 24 (4 MHz input)
bit 2-0
FNOSC<2:0>: Initial Oscillator Select bits
111 = Fast RC Oscillator with Postscaler (FRCDIV)
110 = Reserved
101 = Low-Power RC Oscillator (LPRC)
100 = Secondary Oscillator (SOSC)
011 = Primary Oscillator with PLL module (XTPLL, HSPLL, ECPLL)
010 = Primary Oscillator (XT, HS, EC)
001 = Fast RC Oscillator with Postscaler and PLL module (FRCPLL)
000 = Fast RC Oscillator (FRC)
 2015 Microchip Technology Inc.
DS30010089C-page 467
PIC24FJ256GA412/GB412 FAMILY
REGISTER 33-5:
FOSC: OSCILLATOR CONFIGURATION WORD
U-1
U-1
U-1
U-1
U-1
U-1
U-1
U-1
—
—
—
—
—
—
—
—
bit 23
bit 16
U-1
U-1
U-1
U-1
U-1
U-1
U-1
U-1
—
—
—
—
—
—
—
—
bit 15
bit 8
R/PO-1
R/PO-1
FCKSM1
FCKSM0
R/PO-1
IOL1WAY
R/PO-1
(1)
PLLSS
R/PO-1
R/PO-1
R/PO-1
R/PO-1
SOSCSEL
OSCIOFCN
POSCMOD1
POSCMOD0
bit 7
bit 0
Legend:
PO = Program Once bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 23-8
Unimplemented: Read as ‘1’
bit 7-6
FCKSM<1:0>: Clock Switching and Fail-Safe Clock Monitor Configuration bits
1x = Clock switching and Fail-Safe Clock Monitor are disabled
01 = Clock switching is enabled, Fail-Safe Clock Monitor is disabled
00 = Clock switching is enabled, Fail-Safe Clock Monitor is enabled
bit 5
IOL1WAY: IOLOCK One-Way Set Enable bit
1 = The IOLOCK bit (OSCCON<6>) can be set once, provided the unlock sequence has been
completed; once set, the Peripheral Pin Select registers cannot be written to a second time
0 = The IOLOCK bit can be set and cleared as needed, provided the unlock sequence has been
completed
bit 4
PLLSS: PLL Block Secondary Selection Configuration bit(1)
1 = PLL is driven by the Primary Oscillator
0 = PLL is driven by the FRC Oscillator
bit 3
SOSCSEL: SOSC Selection bit
1 = SOSC circuit is selected
0 = Digital (SCLKI) mode(2)
bit 2
OSCIOFCN: OSCO Pin Configuration bit
If POSCMOD<1:0> = 11 or 00:
1 = OSCO/CLKO/RC15 functions as CLKO (FOSC/2)
0 = OSCO/CLKO/RC15 functions as port I/O (RC15)
If POSCMOD<1:0> = 10 or 01:
OSCIOFCN has no effect on OSCO/CLKO/RC15.
bit 1-0
POSCMOD<1:0>: Primary Oscillator Configuration bits
11 = Primary Oscillator mode is disabled
10 = HS Oscillator mode is selected (HS mode is used if crystal  10 MHz)
01 = XT Oscillator mode is selected (XT mode is used if crystal < 10 MHz)
00 = EC Oscillator mode is selected
Note 1:
2:
Used only when the PLL block is not being used as the system clock source.
Ensure that the SCLKI pin is made a digital input while using this configuration (see Table 11-1).
DS30010089C-page 468
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 33-6:
FWDT: WATCHDOG TIMER CONFIGURATION WORD
U-1
U-1
U-1
U-1
U-1
U-1
U-1
U-1
—
—
—
—
—
—
—
—
bit 23
bit 16
U-1
R/PO-1
R/PO-1
U-1
R/PO-1
U-1
R/PO-1
R/PO-1
—
WDTCLK1
WDTCLK0
—
WDTCMX
—
WDTWIN1
WDTWIN0
bit 15
bit 8
R/PO-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
WINDIS
FWDTEN1
FWDTEN0
FWPSA
WDTPS3
WDTPS2
WDTPS1
WDTPS0
bit 7
bit 0
Legend:
PO = Program Once bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 23-15
Unimplemented: Read as ‘1’
bit 14-13
WDTCLK<1:0>: WDT Clock Source Select bits
When WDTCMX = 1:
11 = Either the 31 kHz FRC source or LPRC
10 = Either the 31 kHz FRC source or LPRC, depending on device configuration(1)
01 = System (peripheral) clock when active and not LPRC, LPRC while in Sleep mode
00 = SOSC input
When WDTCMX = 0:
LPRC is always the WDT clock source.
bit 12
Unimplemented: Read as ‘1’
bit 11
WDTCMX: WDT Clock Multiplexer Control bit
1 = Enables WDT clock multiplexing
0 = WDT clock multiplexing is disabled
bit 10
Unimplemented: Read as ‘1’
bit 9-8
WDTWIN<1:0>: Watchdog Timer Window Width Select bits
11 = 25%
10 = 37.5%
01 = 50%
00 = 75%
bit 7
WINDIS: Windowed Watchdog Timer Disable bit
1 = Standard Watchdog Timer is enabled
0 = Windowed Watchdog Timer is enabled (FWDTEN<1:0> must not be ‘00’)
bit 6-5
FWDTEN<1:0>: Watchdog Timer Configuration bits
11 = WDT is always enabled; SWDTEN bit has no effect
10 = WDT is enabled and controlled in firmware by the SWDTEN bit
01 = WDT is enabled only in Run mode and disabled in Sleep modes; SWDTEN bit is disabled
00 = WDT is disabled; SWDTEN bit is disabled
bit 4
FWPSA: WDT Prescaler Ratio Select bit
1 = Prescaler ratio of 1:128
0 = Prescaler ratio of 1:32
Note 1:
The 31 kHz FRC source is used when a Windowed WDT mode is selected and the LPRC is not being
used as the system clock. The LPRC is used when the device is in Sleep mode and in all other cases.
 2015 Microchip Technology Inc.
DS30010089C-page 469
PIC24FJ256GA412/GB412 FAMILY
REGISTER 33-6:
bit 3-0
Note 1:
FWDT: WATCHDOG TIMER CONFIGURATION WORD (CONTINUED)
WDTPS<3:0>: Watchdog Timer Postscaler Select bits
1111 = 1:32,768
1110 = 1:16,384
1101 = 1:8,192
1100 = 1:4,096
1011 = 1:2,048
1010 = 1:1,024
1001 = 1:512
1000 = 1:256
0111 = 1:128
0110 = 1:64
0101 = 1:32
0100 = 1:16
0011 = 1:8
0010 = 1:4
0001 = 1:2
0000 = 1:1
The 31 kHz FRC source is used when a Windowed WDT mode is selected and the LPRC is not being
used as the system clock. The LPRC is used when the device is in Sleep mode and in all other cases.
DS30010089C-page 470
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 33-7:
FPOR: POR CONFIGURATION WORD
U-1
U-1
U-1
U-1
U-1
U-1
U-1
U-1
—
—
—
—
—
—
—
—
bit 23
bit 16
U-1
U-1
U-1
U-1
U-1
U-1
U-1
U-1
—
—
—
—
—
—
—
—
bit 15
bit 8
r-0
U-1
U-1
U-1
U-1
R/PO-1
U-1
R/PO-1
—
—
—
—
—
LPCFG
—
BOREN
bit 7
bit 0
Legend:
r = Reserved bit
PO = Program Once bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 23-8
Unimplemented: Read as ‘1’
bit 7
Reserved: Maintain this bit as ‘0’
bit 6-3
Unimplemented: Read as ‘1’
bit 2
LPCFG: Low-Voltage/Retention Regulator Configuration bit
1 = Low-voltage/retention regulator is always disabled
0 = Low-power, low-voltage/retention regulator is enabled and controlled in firmware by the RETEN bit
bit 1
Unimplemented: Read as ‘1’
bit 0
BOREN: Brown-out Reset Enable bit
1 = BOR is enabled (all modes except Deep Sleep)
0 = BOR is disabled
 2015 Microchip Technology Inc.
DS30010089C-page 471
PIC24FJ256GA412/GB412 FAMILY
REGISTER 33-8:
FICD: ICD CONFIGURATION WORD
U-1
U-1
U-1
U-1
U-1
U-1
U-1
U-1
—
—
—
—
—
—
—
—
bit 23
bit 16
R/PO-1
U-1
U-1
U-1
U-1
U-1
U-1
U-1
BTSWP
—
—
—
—
—
—
—
bit 15
bit 8
R/PO-1
U-1
R/PO-1
U-1
U-1
U-1
R/PO-1
R/PO-1
DEBUG
—
JTAGEN
—
—
—
ICS1
ICS0
bit 7
bit 0
Legend:
PO = Program Once bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 23-16
Unimplemented: Read as ‘1’
bit 15
BTSWP: BOOTSWP Instruction Disable bit
1 = BOOTSWP instruction is disabled
0 = BOOTSWP instruction is allowed
bit 14-8
Unimplemented: Read as ‘1’
bit 7
DEBUG: Background Debugger Enable bit
1 = Device resets into Operational mode
0 = Device resets into Debug mode
bit 6
Unimplemented: Read as ‘1’
bit 5
JTAGEN: JTAG Port Enable bit
1 = JTAG port is enabled
0 = JTAG port is disabled
bit 4-2
Unimplemented: Read as ‘1’
bit 1-0
ICS<1:0>: Emulator Pin Placement Select bits
11 = Emulator functions are shared with PGEC1/PGED1
10 = Emulator functions are shared with PGEC2/PGED2
01 = Emulator functions are shared with PGEC3/PGED3
00 = Reserved; do not use
DS30010089C-page 472
x = Bit is unknown
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 33-9:
FDS: DEEP SLEEP CONFIGURATION WORD
U-1
U-1
U-1
U-1
U-1
U-1
U-1
U-1
—
—
—
—
—
—
—
—
bit 23
bit 16
R/PO-1
R/PO-1
U-1
U-1
U-1
U-1
U-1
U-1
DSSWEN
RTCBAT
—
—
—
—
—
—
bit 15
bit 8
R/PO-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
DSWDTEN
DSBOREN
DSWDTOSC
DSWDTPS4
DSWDTPS3
DSWDTPS2
DSWDTPS1
DSWDTPS0
bit 7
bit 0
Legend:
PO = Program Once bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 23-16
Unimplemented: Read as ‘1’
bit 15
DSSWEN: Deep Sleep Software Control Select bit
1 = Deep Sleep operation is enabled and controlled by the DSEN bit
0 = Deep Sleep operation is disabled
bit 14
RTCBAT: VBAT RTCC Operation Select bit
1 = RTCC operation continues when the device is in VBAT mode
0 = RTCC operation stops when the device is in VBAT mode
bit 13-8
Unimplemented: Read as ‘1’
bit 7
DSWDTEN: Deep Sleep Watchdog Timer Enable bit
1 = Deep Sleep WDT is enabled
0 = Deep Sleep WDT is disabled
bit 6
DSBOREN: Deep Sleep Brown-out Reset Enable bit
1 = BOR is enabled in Deep Sleep mode
0 = BOR is disabled in Deep Sleep mode (remains active in other Sleep modes)
bit 5
DSWDTOSC: Deep Sleep Watchdog Timer Clock Select bit
1 = Clock source is LPRC
0 = Clock source is SOSC
 2015 Microchip Technology Inc.
DS30010089C-page 473
PIC24FJ256GA412/GB412 FAMILY
REGISTER 33-9:
bit 4-0
FDS: DEEP SLEEP CONFIGURATION WORD (CONTINUED)
DSWDTPS<4:0>: Deep Sleep Watchdog Timer Postscaler Select bits
11111 = 1:68,719,476,736 (25.7 days)
11110 = 1:34,359,738,368(12.8 days)
11101 = 1:17,179,869,184 (6.4 days)
11100 = 1:8,589,934592 (77.0 hours)
11011 = 1:4,294,967,296 (38.5 hours)
11010 = 1:2,147,483,648 (19.2 hours)
11001 = 1:1,073,741,824 (9.6 hours)
11000 = 1:536,870,912 (4.8 hours)
10111 = 1:268,435,456 (2.4 hours)
10110 = 1:134,217,728 (72.2 minutes)
10101 = 1:67,108,864 (36.1 minutes)
10100 = 1:33,554,432 (18.0 minutes)
10011 = 1:16,777,216 (9.0 minutes)
10010 = 1:8,388,608 (4.5 minutes)
10001 = 1:4,194,304 (135.3s)
10000 = 1:2,097,152 (67.7s)
01111 = 1:1,048,576 (33.825s)
01110 = 1:524,288 (16.912s)
01101 = 1:262,114 (8.456s)
01100 = 1:131,072 (4.228s)
01011 = 1:65,536 (2.114s)
01010 = 1:32,768 (1.057s)
01001 = 1:16,384 (528.5 ms)
01000 = 1:8,192 (264.3 ms)
00111 = 1:4,096 (132.1 ms)
00110 = 1:2,048 (66.1 ms)
00101 = 1:1,024 (33 ms)
00100 = 1:512 (16.5 ms)
00011 = 1:256 (8.3 ms)
00010 = 1:128 (4.1 ms)
00001 = 1:64 (2.1 ms)
00000 = 1:32 (1 ms)
DS30010089C-page 474
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 33-10: FDEVOPT1: DEVICE OPTIONS CONFIGURATION WORD
U-1
U-1
U-1
U-1
U-1
U-1
U-1
U-1
—
—
—
—
—
—
—
—
bit 23
bit 16
U-1
U-1
U-1
U-1
U-1
U-1
U-1
U-1
—
—
—
—
—
—
—
—
bit 15
bit 8
U-1
U-1
—
U-1
—
—
R/PO-1
(1)
ALTVREF
R/PO-1
TMPRWIPE
R/PO-1
TMPRPIN
R/PO-1
(2)
ALTCMPI
bit 7
—
bit 0
Legend:
PO = Program Once bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 23-5
Unimplemented: Read as ‘1’
bit 4
ALTVREF: Alternate External Voltage Reference Location Select bit(1)
1 = VREF+/CVREF+/DVREF+ and VREF-/CVREF- are mapped to RA10 and RA9, respectively
0 = VREF+/CVREF+/DVREF+ and VREF-/CVREF- are mapped to RB0 and RB1, respectively
bit 3
TMPRWIPE: Erase Key RAM on Tamper Event Enable Pin bit
1 = Cryptographic Engine Key RAM is not erased on TMPR pin events
0 = Cryptographic Engine Key RAM is erased when a TMPR pin event is detected
bit 2
TMPRPIN: Tamper Pin Disable bit
1 = TMPR pin is disabled
0 = TMPR pin is enabled
bit 1
ALTCMPI: Alternate Comparator Input Location Select bit(2)
1 = C1INC, C2INC and C3INC are mapped to their default pin locations
0 = C1INC, C2INC and C3INC are all mapped to RG9
bit 0
Unimplemented: Read as ‘1’
Note 1:
2:
U-1
Unimplemented on 64-pin devices; maintain this bit as ‘0’ in those devices.
Unimplemented in PIC24FJXXXGAXXX devices.
 2015 Microchip Technology Inc.
DS30010089C-page 475
PIC24FJ256GA412/GB412 FAMILY
REGISTER 33-11: FBTSEQ: BOOT SEQUENCE CONFIGURATION WORD(1)
R/PO-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
IBSEQ11
IBSEQ10
IBSEQ9
IBSEQ8
IBSEQ7
IBSEQ6
IBSEQ5
IBSEQ4
bit 23
bit 16
R/PO-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
IBSEQ3
IBSEQ2
IBSEQ1
IBSEQ0
BSEQ11
BSEQ10
BSEQ9
BSEQ8
bit 15
bit 8
R/PO-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
R/PO-1
BSEQ7
BSEQ6
BSEQ5
BSEQ4
BSEQ3
BSEQ2
BSEQ1
BSEQ0
bit 7
bit 0
Legend:
PO = Program Once bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 23-12
IBSEQ<11:0>: Inverse Boot Sequence Number bits
The inverse of the boot sequence number (FBTSEQ<11:0>). The user is responsible for correctly
calculating and programming this value.
bit 11-0
BSEQ<11:0>: Inverse Boot Sequence Number bits
An arbitrary value assigned by the user at device programming. On device initialization, the code
segment with the lower value of the boot sequence number becomes the Active (executable) Partition.
Note 1:
Implemented only when a Dual Partition mode is selected (FBOOT<1:0> is any value except ‘11’).
DS30010089C-page 476
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
REGISTER 33-12: FBOOT: BOOT MODE CONFIGURATION WORD
U-1
U-1
U-1
U-1
U-1
U-1
U-1
U-1
—
—
—
—
—
—
—
—
bit 23
bit 16
U-1
U-1
U-1
U-1
U-1
U-1
U-1
U-1
—
—
—
—
—
—
—
—
bit 15
bit 8
U-1
U-1
U-1
U-1
U-1
U-1
—
—
—
—
—
—
R/PO-1
R/PO-1
BTMOD<1:0>
bit 7
bit 0
Legend:
PO = Program Once bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 23-2
Unimplemented: Read as ‘1’
bit 1-0
BTMOD<1:0>: Boot Mode Select bits
11 = Standard (Single Partition Flash) mode
10 = Dual Partition Flash mode
01 = Protected Dual Partition Flash mode
00 = Reserved, do not use
 2015 Microchip Technology Inc.
x = Bit is unknown
DS30010089C-page 477
PIC24FJ256GA412/GB412 FAMILY
REGISTER 33-13: DEVID: DEVICE ID REGISTER
U-1
U-1
U-1
U-1
U-1
U-1
U-1
U-1
—
—
—
—
—
—
—
—
bit 23
bit 16
R
R
R
R
R
R
R
R
FAMID7
FAMID6
FAMID5
FAMID4
FAMID3
FAMID2
FAMID1
FAMID0
bit 15
bit 8
R
R
R
R
R
R
R
R
DEV7
DEV6
DEV5
DEV4
DEV3
DEV2
DEV1
DEV0
bit 7
bit 0
Legend: R = Readable bit
U = Unimplemented bit
bit 23-16
Unimplemented: Read as ‘1’
bit 15-8
FAMID<7:0>: Device Family Identifier bits
0110 0001 = PIC24FJ256GA412/GB412 Family
bit 7-0
DEV<7:0>: Individual Device Identifier bits
0000 0000 = PIC24FJ64GA406
0000 0001 = PIC24FJ64GA410
0000 0010 = PIC24FJ64GA412
0000 1000 = PIC24FJ128GA406
0000 1001 = PIC24FJ128GA410
0000 1010 = PIC24FJ128GA412
0001 0000 = PIC24FJ256GA406
0001 0001 = PIC24FJ256GA410
0001 0010 = PIC24FJ256GA412
0000
0000
0000
0000
0000
0000
0001
0001
0001
0100 = PIC24FJ64GB406
0101 = PIC24FJ64GB410
0110 = PIC24FJ64GB412
1100 = PIC24FJ128GB406
1101 = PIC24FJ128GB410
1110 = PIC24FJ128GB412
0100 = PIC24FJ256GB406
0101 = PIC24FJ256GB410
0110 = PIC24FJ256GB412
REGISTER 33-14: DEVREV: DEVICE REVISION REGISTER
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 23
bit 16
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
U-0
U-0
U-0
U-0
—
—
—
—
R
R
R
R
REV<3:0>
bit 7
bit 0
Legend: R = Readable bit
bit 23-4
Unimplemented: Read as ‘0’
bit 3-0
REV<3:0>: Device Revision Identifier bits
DS30010089C-page 478
U = Unimplemented bit
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
33.2
On-Chip Voltage Regulator
All PIC24FJ256GA412/GB412 family devices power
their core digital logic at a nominal 1.8V. This may create
an issue for designs that are required to operate at a
higher typical voltage, such as 3.3V. To simplify system
design, all devices in the PIC24FJ256GA412/GB412
family incorporate an on-chip regulator that allows the
device to run its core logic from VDD.
This regulator is always enabled. It provides a constant
voltage (1.8V nominal) to the digital core logic, from a
VDD of 2.0V all the way up to the device’s VDDMAX. It
does not have the capability to boost VDD levels. In order
to prevent “brown-out” conditions when the voltage
drops too low for the regulator, the Brown-out Reset
occurs. Then, the regulator output follows VDD with a
typical voltage drop of 300 mV.
A low-ESR capacitor (such as ceramic) must be
connected to the VCAP pin (Figure 33-1). This helps to
maintain the stability of the regulator. The recommended
value for the Filter Capacitor (CEFC) is provided in
Section 36.1 “DC Characteristics”.
FIGURE 33-1:
CONNECTIONS FOR THE
ON-CHIP REGULATOR
3.3V(1)
PIC24FJXXXGX4XX
VDD
VCAP
CEFC
(10 F typ)
Note 1:
VSS
This is a typical operating voltage. Refer to
Section 36.0 “Electrical Characteristics”
for the full operating ranges of VDD.
33.2.1
ON-CHIP REGULATOR AND POR
The voltage regulator requires a small amount of time
to transition from a disabled or standby state into
normal operating mode. During this time, designated
as TVREG, code execution is disabled. TVREG is applied
every time the device resumes operation after any
power-down, including Sleep mode. TVREG is determined by the status of the PMSLP bit (RCON<8>).
Refer to Section 36.0 “Electrical Characteristics” for
more information on TVREG.
Note:
33.2.2
For more information, see Section 36.0
“Electrical Characteristics”. The information in this data sheet supersedes the
information in the “dsPIC33/PIC24 Family
Reference Manual”.
VOLTAGE REGULATOR STANDBY
MODE
The on-chip regulator always consumes a small incremental amount of current over IDD/IPD, including when
the device is in Sleep mode, even though the core
digital logic does not require power. To provide additional savings in applications where power resources
are critical, the regulator can be made to enter Standby
mode on its own whenever the device goes into Sleep
mode. This feature is controlled by the PMSLP bit
(RCON<8>). Clearing the PMSLP bit enables the
Standby mode. When waking up from Standby mode,
the regulator needs to wait for TVREG to expire before
wake-up.
33.2.3
LOW-VOLTAGE/RETENTION
REGULATOR
When power-saving modes, such as Sleep is used,
PIC24FJ256GA412/GB412 family devices may use a
separate low-power, low-voltage/retention regulator to
power critical circuits. This regulator, which operates at
1.2V nominal, maintains power to data RAM and the
RTCC while all other core digital logic is powered down.
It operates only in Sleep and VBAT modes.
The low-voltage/retention regulator is described in more
detail in Section 10.1.3 “Low-Voltage/Retention
Regulator”.
 2015 Microchip Technology Inc.
DS30010089C-page 479
PIC24FJ256GA412/GB412 FAMILY
33.3
Watchdog Timer (WDT)
For PIC24FJ256GA412/GB412 family devices, the
WDT is driven by the LPRC Oscillator. When the WDT
is enabled, the clock source is also enabled.
The nominal WDT clock source from LPRC is 31 kHz.
This feeds a prescaler that can be configured for either
5-bit (divide-by-32) or 7-bit (divide-by-128) operation.
The prescaler is set by the FWPSA Configuration bit.
With a 31 kHz input, the prescaler yields a nominal
WDT Time-out period (TWDT) of 1 ms in 5-bit mode or
4 ms in 7-bit mode.
A variable postscaler divides down the WDT prescaler
output and allows for a wide range of time-out periods.
The postscaler is controlled by the WDTPS<3:0> Configuration bits (FWDT<3:0>), which allows the selection
of a total of 16 settings, from 1:1 to 1:32,768. Using the
prescaler and postscaler time-out periods, ranges from
1 ms to 131 seconds can be achieved.
The WDT Flag bit, WDTO (RCON<4>), is not automatically cleared following a WDT time-out. To detect
subsequent WDT events, the flag must be cleared in
software.
Note:
33.3.1
The CLRWDT and PWRSAV instructions
clear the prescaler and postscaler counts
when executed.
WINDOWED OPERATION
The Watchdog Timer has an optional Fixed Window
mode of operation. In this Windowed mode, CLRWDT
instructions can only reset the WDT during the last 1/4
of the programmed WDT period. A CLRWDT instruction
executed before that window causes a WDT Reset,
similar to a WDT time-out.
Windowed WDT mode is enabled by programming the
WINDIS Configuration bit (FWDT<7>) to ‘0’.
The WDT, prescaler and postscaler are reset:
33.3.2
• On any device Reset
• On the completion of a clock switch, whether
invoked by software (i.e., setting the OSWEN bit
after changing the NOSCx bits) or by hardware
(i.e., Fail-Safe Clock Monitor)
• When a PWRSAV instruction is executed
(i.e., Sleep or Idle mode is entered)
• When the device exits Sleep or Idle mode to
resume normal operation
• By a CLRWDT instruction during normal execution
The WDT is enabled or disabled by the FWDTEN<1:0>
Configuration bits. When the Configuration bits,
FWDTEN<1:0> = 11, the WDT is always enabled.
If the WDT is enabled, it will continue to run during
Sleep or Idle modes. When the WDT time-out occurs,
the device will wake the device and code execution will
continue from where the PWRSAV instruction was
executed. The corresponding SLEEP or IDLE
(RCON<3:2>) bit will need to be cleared in software
after the device wakes up.
FIGURE 33-2:
CONTROL REGISTER
The WDT can be optionally controlled in software when
the Configuration bits, FWDTEN<1:0> = 10. When
FWDTEN<1:0> = 00, the Watchdog Timer is always
disabled. The WDT is enabled in software by setting
the SWDTEN control bit (RCON<5>). The SWDTEN
control bit is cleared on any device Reset. The software
WDT option allows the user to enable the WDT for
critical code segments and disable the WDT during
non-critical segments for maximum power savings.
WDT BLOCK DIAGRAM
SWDTEN
FWDTEN<1:0>
LPRC Control
FWPSA
WDTPS<3:0>
Prescaler
(5-bit/7-bit)
LPRC Input
31 kHz
Wake from Sleep
WDT
Counter
Postscaler
1:1 to 1:32.768
WDT Overflow
Reset
1 ms/4 ms
All Device Resets
Transition to
New Clock Source
Exit Sleep or
Idle Mode
CLRWDT Instr.
PWRSAV Instr.
Sleep or Idle Mode
DS30010089C-page 480
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
33.4
Code Protection and
CodeGuard™ Security
To help protect individual intellectual property in software applications, PIC24FJ256GA412/GB412 family
devices offer an intermediate implementation of
CodeGuard Security. This version implements the
following features:
• General Segment (GS) security
• Boot Segment (BS) security, including boot block
resizing protection
• Configuration Segment (CS) security
• Separately configurable write protection for all
segments
• Enhanced features for Dual Partition applications
Security features are controlled by the FSEC and
FBSLIM registers. The Boot Segment (BS) is the
higher privileged segment and the General Segment
(GS) is the lower privileged segment. The total user
code memory can be split into BS or GS. The size of
the segments is determined by BSLIM<12:0>. The relative location of the segments within user space does
not change, such that BS (if present) occupies the
memory area just after the Interrupt Vector Table (IVT),
and the GS occupies the space just after the BS (or if
the Alternate IVT is enabled, just after it).
The Configuration Segment (or CS) is a small segment
(less than a page, typically just one row) within user
Flash address space. It contains all user configuration
data that is loaded by the NVM Controller during the
Reset sequence.
33.5
JTAG Interface
PIC24FJ256GA412/GB412 family devices implement
a JTAG interface, which supports boundary scan
device testing.
33.6
In-Circuit Serial Programming
PIC24FJ256GA412/GB412 family microcontrollers can
be serially programmed while in the end application
circuit. This is simply done with two lines for clock
(PGECx) and data (PGEDx), and three other lines for
power (VDD), ground (VSS) and MCLR. This allows customers to manufacture boards with unprogrammed
devices and then program the microcontroller just before
shipping the product. This also allows the most recent
firmware or a custom firmware to be programmed.
33.7
In-Circuit Debugger
When MPLAB® ICD 3 is selected as a debugger, the
in-circuit debugging functionality is enabled. This function allows simple debugging functions when used with
MPLAB IDE. Debugging functionality is controlled
through the PGECx (Emulation/Debug Clock) and
PGEDx (Emulation/Debug Data) pins.
To use the in-circuit debugger function of the device,
the design must implement ICSP™ connections to
MCLR, VDD, VSS and the PGECx/PGEDx pin pair, designated by the ICSx Configuration bits. In addition,
when the feature is enabled, some of the resources are
not available for general use. These resources include
the first 80 bytes of data RAM and two I/O pins.
Refer to “CodeGuard™ Intermediate Security”
(DS70005182) in the “dsPIC33/PIC24 Family
Reference Manual” for further information on usage,
configuration and operation of CodeGuard Security.
33.4.1
CONFIGURATION REGISTER
PROTECTION
The Configuration registers are protected against
inadvertent or unwanted changes, or reads in two
ways. The primary protection method is the same as
that of the RP registers – shadow registers contain a
complimentary value which is constantly compared
with the actual value.
To safeguard against unpredictable events, Configuration bit changes resulting from individual cell-level
disruptions (such as ESD events) will cause a parity
error and trigger a device Reset.
The data for the Configuration registers is derived from
the Flash Configuration Words in program memory.
When the configuration security is enabled, the source
data for device configuration is protected.
 2015 Microchip Technology Inc.
DS30010089C-page 481
PIC24FJ256GA412/GB412 FAMILY
NOTES:
DS30010089C-page 482
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
34.0
DEVELOPMENT SUPPORT
The PIC® microcontrollers (MCU) and dsPIC® digital
signal controllers (DSC) are supported with a full range
of software and hardware development tools:
• Integrated Development Environment
- MPLAB® X IDE Software
• Compilers/Assemblers/Linkers
- MPLAB XC Compiler
- MPASMTM Assembler
- MPLINKTM Object Linker/
MPLIBTM Object Librarian
- MPLAB Assembler/Linker/Librarian for
Various Device Families
• Simulators
- MPLAB X SIM Software Simulator
• Emulators
- MPLAB REAL ICE™ In-Circuit Emulator
• In-Circuit Debuggers/Programmers
- MPLAB ICD 3
- PICkit™ 3
• Device Programmers
- MPLAB PM3 Device Programmer
• Low-Cost Demonstration/Development Boards,
Evaluation Kits and Starter Kits
• Third-party development tools
34.1
MPLAB X Integrated Development
Environment Software
The MPLAB X IDE is a single, unified graphical user
interface for Microchip and third-party software, and
hardware development tool that runs on Windows®,
Linux and Mac OS® X. Based on the NetBeans IDE,
MPLAB X IDE is an entirely new IDE with a host of free
software components and plug-ins for highperformance application development and debugging.
Moving between tools and upgrading from software
simulators to hardware debugging and programming
tools is simple with the seamless user interface.
With complete project management, visual call graphs,
a configurable watch window and a feature-rich editor
that includes code completion and context menus,
MPLAB X IDE is flexible and friendly enough for new
users. With the ability to support multiple tools on
multiple projects with simultaneous debugging, MPLAB
X IDE is also suitable for the needs of experienced
users.
Feature-Rich Editor:
• Color syntax highlighting
• Smart code completion makes suggestions and
provides hints as you type
• Automatic code formatting based on user-defined
rules
• Live parsing
User-Friendly, Customizable Interface:
• Fully customizable interface: toolbars, toolbar
buttons, windows, window placement, etc.
• Call graph window
Project-Based Workspaces:
•
•
•
•
Multiple projects
Multiple tools
Multiple configurations
Simultaneous debugging sessions
File History and Bug Tracking:
• Local file history feature
• Built-in support for Bugzilla issue tracker
 2015 Microchip Technology Inc.
DS30010089C-page 483
PIC24FJ256GA412/GB412 FAMILY
34.2
MPLAB XC Compilers
The MPLAB XC Compilers are complete ANSI C
compilers for all of Microchip’s 8, 16, and 32-bit MCU
and DSC devices. These compilers provide powerful
integration capabilities, superior code optimization and
ease of use. MPLAB XC Compilers run on Windows,
Linux or MAC OS X.
For easy source level debugging, the compilers provide
debug information that is optimized to the MPLAB X
IDE.
The free MPLAB XC Compiler editions support all
devices and commands, with no time or memory
restrictions, and offer sufficient code optimization for
most applications.
MPLAB XC Compilers include an assembler, linker and
utilities. The assembler generates relocatable object
files that can then be archived or linked with other relocatable object files and archives to create an executable file. MPLAB XC Compiler uses the assembler to
produce its object file. Notable features of the assembler include:
•
•
•
•
•
•
Support for the entire device instruction set
Support for fixed-point and floating-point data
Command-line interface
Rich directive set
Flexible macro language
MPLAB X IDE compatibility
34.3
MPASM Assembler
The MPASM Assembler is a full-featured, universal
macro assembler for PIC10/12/16/18 MCUs.
The MPASM Assembler generates relocatable object
files for the MPLINK Object Linker, Intel® standard HEX
files, MAP files to detail memory usage and symbol
reference, absolute LST files that contain source lines
and generated machine code, and COFF files for
debugging.
The MPASM Assembler features include:
34.4
MPLINK Object Linker/
MPLIB Object Librarian
The MPLINK Object Linker combines relocatable
objects created by the MPASM Assembler. It can link
relocatable objects from precompiled libraries, using
directives from a linker script.
The MPLIB Object Librarian manages the creation and
modification of library files of precompiled code. When
a routine from a library is called from a source file, only
the modules that contain that routine will be linked in
with the application. This allows large libraries to be
used efficiently in many different applications.
The object linker/library features include:
• Efficient linking of single libraries instead of many
smaller files
• Enhanced code maintainability by grouping
related modules together
• Flexible creation of libraries with easy module
listing, replacement, deletion and extraction
34.5
MPLAB Assembler, Linker and
Librarian for Various Device
Families
MPLAB Assembler produces relocatable machine
code from symbolic assembly language for PIC24,
PIC32 and dsPIC DSC devices. MPLAB XC Compiler
uses the assembler to produce its object file. The
assembler generates relocatable object files that can
then be archived or linked with other relocatable object
files and archives to create an executable file. Notable
features of the assembler include:
•
•
•
•
•
•
Support for the entire device instruction set
Support for fixed-point and floating-point data
Command-line interface
Rich directive set
Flexible macro language
MPLAB X IDE compatibility
• Integration into MPLAB X IDE projects
• User-defined macros to streamline
assembly code
• Conditional assembly for multipurpose
source files
• Directives that allow complete control over the
assembly process
DS30010089C-page 484
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
34.6
MPLAB X SIM Software Simulator
The MPLAB X SIM Software Simulator allows code
development in a PC-hosted environment by simulating the PIC MCUs and dsPIC DSCs on an instruction
level. On any given instruction, the data areas can be
examined or modified and stimuli can be applied from
a comprehensive stimulus controller. Registers can be
logged to files for further run-time analysis. The trace
buffer and logic analyzer display extend the power of
the simulator to record and track program execution,
actions on I/O, most peripherals and internal registers.
The MPLAB X SIM Software Simulator fully supports
symbolic debugging using the MPLAB XC Compilers,
and the MPASM and MPLAB Assemblers. The software simulator offers the flexibility to develop and
debug code outside of the hardware laboratory environment, making it an excellent, economical software
development tool.
34.7
MPLAB REAL ICE In-Circuit
Emulator System
The MPLAB REAL ICE In-Circuit Emulator System is
Microchip’s next generation high-speed emulator for
Microchip Flash DSC and MCU devices. It debugs and
programs all 8, 16 and 32-bit MCU, and DSC devices
with the easy-to-use, powerful graphical user interface of
the MPLAB X IDE.
The emulator is connected to the design engineer’s
PC using a high-speed USB 2.0 interface and is
connected to the target with either a connector
compatible with in-circuit debugger systems (RJ-11)
or with the new high-speed, noise tolerant, LowVoltage Differential Signal (LVDS) interconnection
(CAT5).
The emulator is field upgradable through future firmware
downloads in MPLAB X IDE. MPLAB REAL ICE offers
significant advantages over competitive emulators
including full-speed emulation, run-time variable
watches, trace analysis, complex breakpoints, logic
probes, a ruggedized probe interface and long (up to
three meters) interconnection cables.
 2015 Microchip Technology Inc.
34.8
MPLAB ICD 3 In-Circuit Debugger
System
The MPLAB ICD 3 In-Circuit Debugger System is
Microchip’s most cost-effective, high-speed hardware
debugger/programmer for Microchip Flash DSC and
MCU devices. It debugs and programs PIC Flash
microcontrollers and dsPIC DSCs with the powerful,
yet easy-to-use graphical user interface of the MPLAB
IDE.
The MPLAB ICD 3 In-Circuit Debugger probe is
connected to the design engineer’s PC using a highspeed USB 2.0 interface and is connected to the target
with a connector compatible with the MPLAB ICD 2 or
MPLAB REAL ICE systems (RJ-11). MPLAB ICD 3
supports all MPLAB ICD 2 headers.
34.9
PICkit 3 In-Circuit Debugger/
Programmer
The MPLAB PICkit 3 allows debugging and programming of PIC and dsPIC Flash microcontrollers at a most
affordable price point using the powerful graphical user
interface of the MPLAB IDE. The MPLAB PICkit 3 is
connected to the design engineer’s PC using a fullspeed USB interface and can be connected to the target via a Microchip debug (RJ-11) connector (compatible with MPLAB ICD 3 and MPLAB REAL ICE). The
connector uses two device I/O pins and the Reset line
to implement in-circuit debugging and In-Circuit Serial
Programming™ (ICSP™).
34.10 MPLAB PM3 Device Programmer
The MPLAB PM3 Device Programmer is a universal,
CE compliant device programmer with programmable
voltage verification at VDDMIN and VDDMAX for
maximum reliability. It features a large LCD display
(128 x 64) for menus and error messages, and a modular, detachable socket assembly to support various
package types. The ICSP cable assembly is included
as a standard item. In Stand-Alone mode, the MPLAB
PM3 Device Programmer can read, verify and program
PIC devices without a PC connection. It can also set
code protection in this mode. The MPLAB PM3
connects to the host PC via an RS-232 or USB cable.
The MPLAB PM3 has high-speed communications and
optimized algorithms for quick programming of large
memory devices, and incorporates an MMC card for file
storage and data applications.
DS30010089C-page 485
PIC24FJ256GA412/GB412 FAMILY
34.11 Demonstration/Development
Boards, Evaluation Kits, and
Starter Kits
A wide variety of demonstration, development and
evaluation boards for various PIC MCUs and dsPIC
DSCs allows quick application development on fully
functional systems. Most boards include prototyping
areas for adding custom circuitry and provide application firmware and source code for examination and
modification.
The boards support a variety of features, including LEDs,
temperature sensors, switches, speakers, RS-232
interfaces, LCD displays, potentiometers and additional
EEPROM memory.
34.12 Third-Party Development Tools
Microchip also offers a great collection of tools from
third-party vendors. These tools are carefully selected
to offer good value and unique functionality.
• Device Programmers and Gang Programmers
from companies, such as SoftLog and CCS
• Software Tools from companies, such as Gimpel
and Trace Systems
• Protocol Analyzers from companies, such as
Saleae and Total Phase
• Demonstration Boards from companies, such as
MikroElektronika, Digilent® and Olimex
• Embedded Ethernet Solutions from companies,
such as EZ Web Lynx, WIZnet and IPLogika®
The demonstration and development boards can be
used in teaching environments, for prototyping custom
circuits and for learning about various microcontroller
applications.
In addition to the PICDEM™ and dsPICDEM™
demonstration/development board series of circuits,
Microchip has a line of evaluation kits and demonstration software for analog filter design, KEELOQ® security
ICs, CAN, IrDA®, PowerSmart battery management,
SEEVAL® evaluation system, Sigma-Delta , flow rate
sensing, plus many more.
Also available are starter kits that contain everything
needed to experience the specified device. This usually
includes a single application and debug capability, all
on one board.
Check the Microchip web page (www.microchip.com)
for the complete list of demonstration, development
and evaluation kits.
DS30010089C-page 486
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
35.0
Note:
INSTRUCTION SET SUMMARY
This chapter is a brief summary of the
PIC24F Instruction Set Architecture (ISA)
and is not intended to be a comprehensive
reference source.
The PIC24F instruction set adds many enhancements
to the previous PIC® MCU instruction sets, while maintaining an easy migration from previous PIC MCU
instruction sets. Most instructions are a single program
memory word. Only three instructions require two
program memory locations.
Each single-word instruction is a 24-bit word divided
into an 8-bit opcode, which specifies the instruction
type and one or more operands, which further specify
the operation of the instruction. The instruction set is
highly orthogonal and is grouped into four basic
categories:
•
•
•
•
• A literal value to be loaded into a W register or file
register (specified by the value of ‘k’)
• The W register or file register where the literal
value is to be loaded (specified by ‘Wb’ or ‘f’)
However, literal instructions that involve arithmetic or
logical operations use some of the following operands:
• The first source operand, which is a register, ‘Wb’,
without any address modifier
• The second source operand, which is a literal
value
• The destination of the result (only if not the same
as the first source operand), which is typically a
register, ‘Wd’, with or without an address modifier
The control instructions may use some of the following
operands:
• A program memory address
• The mode of the Table Read and Table Write
instructions
Word or byte-oriented operations
Bit-oriented operations
Literal operations
Control operations
Table 35-1 shows the general symbols used in
describing the instructions. The PIC24F instruction set
summary in Table 35-2 lists all the instructions, along
with the status flags affected by each instruction.
Most word or byte-oriented W register instructions
(including barrel shift instructions) have three
operands:
• The first source operand, which is typically a
register, ‘Wb’, without any address modifier
• The second source operand, which is typically a
register, ‘Ws’, with or without an address modifier
• The destination of the result, which is typically a
register, ‘Wd’, with or without an address modifier
However, word or byte-oriented file register instructions
have two operands:
• The file register specified by the value, ‘f’
• The destination, which could either be the file
register, ‘f’, or the W0 register, which is denoted
as ‘WREG’
Most bit-oriented instructions (including
rotate/shift instructions) have two operands:
The literal instructions that involve data movement may
use some of the following operands:
simple
All instructions are a single word, except for certain
double-word instructions, which were made
double-word instructions so that all the required information is available in these 48 bits. In the second word,
the 8 MSbs are ‘0’s. If this second word is executed as
an instruction (by itself), it will execute as a NOP.
Most single-word instructions are executed in a single
instruction cycle, unless a conditional test is true or the
Program Counter is changed as a result of the instruction. In these cases, the execution takes two instruction
cycles, with the additional instruction cycle(s) executed
as a NOP. Notable exceptions are the BRA (unconditional/computed branch), indirect CALL/GOTO, all
Table Reads and Writes, and RETURN/RETFIE
instructions, which are single-word instructions but take
two or three cycles.
Certain instructions that involve skipping over the subsequent instruction require either two or three cycles if
the skip is performed, depending on whether the
instruction being skipped is a single-word or two-word
instruction. Moreover, double-word moves require two
cycles. The double-word instructions execute in two
instruction cycles.
• The W register (with or without an address
modifier) or file register (specified by the value of
‘Ws’ or ‘f’)
• The bit in the W register or file register
(specified by a literal value or indirectly by the
contents of register, ‘Wb’)
 2015 Microchip Technology Inc.
DS30010089C-page 487
PIC24FJ256GA412/GB412 FAMILY
TABLE 35-1:
SYMBOLS USED IN OPCODE DESCRIPTIONS
Field
Description
#text
Means literal defined by “text”
(text)
Means “content of text”
[text]
Means “the location addressed by text”
{ }
Optional field or operation
<n:m>
Register bit field
.b
Byte mode selection
.d
Double-Word mode selection
.S
Shadow register select
.w
Word mode selection (default)
bit4
4-bit Bit Selection field (used in word addressed instructions) {0...15}
C, DC, N, OV, Z
MCU Status bits: Carry, Digit Carry, Negative, Overflow, Sticky Zero
Expr
Absolute address, label or expression (resolved by the linker)
f
File register address {0000h...1FFFh}
lit1
1-bit unsigned literal {0,1}
lit4
4-bit unsigned literal {0...15}
lit5
5-bit unsigned literal {0...31}
lit8
8-bit unsigned literal {0...255}
lit10
10-bit unsigned literal {0...255} for Byte mode, {0:1023} for Word mode
lit14
14-bit unsigned literal {0...16383}
lit16
16-bit unsigned literal {0...65535}
lit23
23-bit unsigned literal {0...8388607}; LSB must be ‘0’
None
Field does not require an entry, may be blank
PC
Program Counter
Slit10
10-bit signed literal {-512...511}
Slit16
16-bit signed literal {-32768...32767}
Slit6
6-bit signed literal {-16...16}
Wb
Base W register {W0..W15}
Wd
Destination W register { Wd, [Wd], [Wd++], [Wd--], [++Wd], [--Wd] }
Wdo
Destination W register 
{ Wnd, [Wnd], [Wnd++], [Wnd--], [++Wnd], [--Wnd], [Wnd+Wb] }
Wm,Wn
Dividend, Divisor Working register pair (direct addressing)
Wn
One of 16 Working registers {W0..W15}
Wnd
One of 16 Destination Working registers {W0..W15}
Wns
One of 16 Source Working registers {W0..W15}
WREG
W0 (Working register used in file register instructions)
Ws
Source W register { Ws, [Ws], [Ws++], [Ws--], [++Ws], [--Ws] }
Wso
Source W register { Wns, [Wns], [Wns++], [Wns--], [++Wns], [--Wns], [Wns+Wb] }
DS30010089C-page 488
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
TABLE 35-2:
INSTRUCTION SET OVERVIEW
Assembly
Mnemonic
Assembly Syntax
Description
# of
Words
# of
Cycles
Status Flags
Affected
ADD
f
f = f + WREG
1
1
C, DC, N, OV, Z
ADD
f,WREG
WREG = f + WREG
1
1
C, DC, N, OV, Z
ADD
#lit10,Wn
Wd = lit10 + Wd
1
1
C, DC, N, OV, Z
ADD
Wb,Ws,Wd
Wd = Wb + Ws
1
1
C, DC, N, OV, Z
ADD
Wb,#lit5,Wd
Wd = Wb + lit5
1
1
C, DC, N, OV, Z
ADDC
f
f = f + WREG + (C)
1
1
C, DC, N, OV, Z
ADDC
f,WREG
WREG = f + WREG + (C)
1
1
C, DC, N, OV, Z
ADDC
#lit10,Wn
Wd = lit10 + Wd + (C)
1
1
C, DC, N, OV, Z
ADDC
Wb,Ws,Wd
Wd = Wb + Ws + (C)
1
1
C, DC, N, OV, Z
ADDC
Wb,#lit5,Wd
Wd = Wb + lit5 + (C)
1
1
C, DC, N, OV, Z
AND
f
f = f .AND. WREG
1
1
N, Z
AND
f,WREG
WREG = f .AND. WREG
1
1
N, Z
AND
#lit10,Wn
Wd = lit10 .AND. Wd
1
1
N, Z
AND
Wb,Ws,Wd
Wd = Wb .AND. Ws
1
1
N, Z
AND
Wb,#lit5,Wd
Wd = Wb .AND. lit5
1
1
N, Z
ASR
f
f = Arithmetic Right Shift f
1
1
C, N, OV, Z
ASR
f,WREG
WREG = Arithmetic Right Shift f
1
1
C, N, OV, Z
ASR
Ws,Wd
Wd = Arithmetic Right Shift Ws
1
1
C, N, OV, Z
ASR
Wb,Wns,Wnd
Wnd = Arithmetic Right Shift Wb by Wns
1
1
N, Z
ASR
Wb,#lit5,Wnd
Wnd = Arithmetic Right Shift Wb by lit5
1
1
N, Z
BCLR
BCLR
f,#bit4
Bit Clear f
1
1
None
BCLR
Ws,#bit4
Bit Clear Ws
1
1
None
BRA
BRA
C,Expr
Branch if Carry
1
1 (2)
None
BRA
GE,Expr
Branch if Greater than or Equal
1
1 (2)
None
BRA
GEU,Expr
Branch if Unsigned Greater than or Equal
1
1 (2)
None
BRA
GT,Expr
Branch if Greater than
1
1 (2)
None
BRA
GTU,Expr
Branch if Unsigned Greater than
1
1 (2)
None
BRA
LE,Expr
Branch if Less than or Equal
1
1 (2)
None
BRA
LEU,Expr
Branch if Unsigned Less than or Equal
1
1 (2)
None
BRA
LT,Expr
Branch if Less than
1
1 (2)
None
BRA
LTU,Expr
Branch if Unsigned Less than
1
1 (2)
None
BRA
N,Expr
Branch if Negative
1
1 (2)
None
BRA
NC,Expr
Branch if Not Carry
1
1 (2)
None
BRA
NN,Expr
Branch if Not Negative
1
1 (2)
None
BRA
NOV,Expr
Branch if Not Overflow
1
1 (2)
None
BRA
NZ,Expr
Branch if Not Zero
1
1 (2)
None
BRA
OV,Expr
Branch if Overflow
1
1 (2)
None
BRA
Expr
Branch Unconditionally
1
2
None
BRA
Z,Expr
Branch if Zero
1
1 (2)
None
BRA
Wn
Computed Branch
1
2
None
BSET
f,#bit4
Bit Set f
1
1
None
BSET
Ws,#bit4
Bit Set Ws
1
1
None
BSW.C
Ws,Wb
Write C bit to Ws<Wb>
1
1
None
BSW.Z
Ws,Wb
Write Z bit to Ws<Wb>
1
1
None
BTG
BTG
f,#bit4
Bit Toggle f
1
1
None
BTG
Ws,#bit4
Bit Toggle Ws
1
1
None
BTSC
BTSC
f,#bit4
Bit Test f, Skip if Clear
1
1
None
(2 or 3)
BTSC
Ws,#bit4
Bit Test Ws, Skip if Clear
1
1
None
(2 or 3)
ADD
ADDC
AND
ASR
BSET
BSW
 2015 Microchip Technology Inc.
DS30010089C-page 489
PIC24FJ256GA412/GB412 FAMILY
TABLE 35-2:
INSTRUCTION SET OVERVIEW (CONTINUED)
Assembly
Mnemonic
BTSS
BTST
BTSTS
Assembly Syntax
# of
Words
Description
# of
Cycles
Status Flags
Affected
BTSS
f,#bit4
Bit Test f, Skip if Set
1
1
None
(2 or 3)
BTSS
Ws,#bit4
Bit Test Ws, Skip if Set
1
1
None
(2 or 3)
BTST
f,#bit4
Bit Test f
1
1
Z
BTST.C
Ws,#bit4
Bit Test Ws to C
1
1
C
BTST.Z
Ws,#bit4
Bit Test Ws to Z
1
1
Z
BTST.C
Ws,Wb
Bit Test Ws<Wb> to C
1
1
C
BTST.Z
Ws,Wb
Bit Test Ws<Wb> to Z
1
1
Z
BTSTS
f,#bit4
Bit Test then Set f
1
1
Z
BTSTS.C
Ws,#bit4
Bit Test Ws to C, then Set
1
1
C
BTSTS.Z
Ws,#bit4
Bit Test Ws to Z, then Set
1
1
Z
None
BTSWP
BTSWP
Swap Active and Inactive Flash Address Spaces
1
1
CALL
CALL
lit23
Call Subroutine
2
2
None
CALL
Wn
Call Indirect Subroutine
1
2
None
CLR
f
f = 0x0000
1
1
None
CLR
WREG
WREG = 0x0000
1
1
None
CLR
Ws
Ws = 0x0000
1
1
None
Clear Watchdog Timer
1
1
WDTO, SLEEP
CLR
CLRWDT
CLRWDT
COM
COM
f
f=f
1
1
N, Z
COM
f,WREG
WREG = f
1
1
N, Z
COM
Ws,Wd
Wd = Ws
1
1
N, Z
CP
f
Compare f with WREG
1
1
C, DC, N, OV, Z
CP
Wb,#lit5
Compare Wb with lit5
1
1
C, DC, N, OV, Z
CP
Wb,Ws
Compare Wb with Ws (Wb – Ws)
1
1
C, DC, N, OV, Z
CP0
f
Compare f with 0x0000
1
1
C, DC, N, OV, Z
CP0
Ws
Compare Ws with 0x0000
1
1
C, DC, N, OV, Z
CPB
f
Compare f with WREG, with Borrow
1
1
C, DC, N, OV, Z
CPB
Wb,#lit5
Compare Wb with lit5, with Borrow
1
1
C, DC, N, OV, Z
CPB
Wb,Ws
Compare Wb with Ws, with Borrow
(Wb – Ws – C)
1
1
C, DC, N, OV, Z
CPSEQ
CPSEQ
Wb,Wn
Compare Wb with Wn, Skip if =
1
1
None
(2 or 3)
CPSGT
CPSGT
Wb,Wn
Compare Wb with Wn, Skip if >
1
1
None
(2 or 3)
CPSLT
CPSLT
Wb,Wn
Compare Wb with Wn, Skip if <
1
1
None
(2 or 3)
CPSNE
CPSNE
Wb,Wn
Compare Wb with Wn, Skip if 
1
1
None
(2 or 3)
DAW
DAW.B
Wn
Wn = Decimal Adjust Wn
1
1
C
DEC
DEC
f
f = f –1
1
1
C, DC, N, OV, Z
DEC
f,WREG
WREG = f –1
1
1
C, DC, N, OV, Z
DEC
Ws,Wd
Wd = Ws – 1
1
1
C, DC, N, OV, Z
DEC2
f
f=f–2
1
1
C, DC, N, OV, Z
DEC2
f,WREG
WREG = f – 2
1
1
C, DC, N, OV, Z
DEC2
Ws,Wd
Wd = Ws – 2
1
1
C, DC, N, OV, Z
DISI
DISI
#lit14
Disable Interrupts for k Instruction Cycles
1
1
None
DIV
DIV.SW
Wm,Wn
Signed 16/16-bit Integer Divide
1
18
N, Z, C, OV
DIV.SD
Wm,Wn
Signed 32/16-bit Integer Divide
1
18
N, Z, C, OV
DIV.UW
Wm,Wn
Unsigned 16/16-bit Integer Divide
1
18
N, Z, C, OV
DIV.UD
Wm,Wn
Unsigned 32/16-bit Integer Divide
1
18
N, Z, C, OV
EXCH
EXCH
Wns,Wnd
Swap Wns with Wnd
1
1
None
FF1L
FF1L
Ws,Wnd
Find First One from Left (MSb) Side
1
1
C
FF1R
FF1R
Ws,Wnd
Find First One from Right (LSb) Side
1
1
C
CP
CP0
CPB
DEC2
DS30010089C-page 490
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
TABLE 35-2:
INSTRUCTION SET OVERVIEW (CONTINUED)
Assembly
Mnemonic
Assembly Syntax
Description
# of
Words
# of
Cycles
Status Flags
Affected
GOTO
Expr
Go to Address
2
2
None
GOTO
Wn
Go to Indirect
1
2
None
INC
f
f=f+1
1
1
C, DC, N, OV, Z
INC
f,WREG
WREG = f + 1
1
1
C, DC, N, OV, Z
INC
Ws,Wd
Wd = Ws + 1
1
1
C, DC, N, OV, Z
INC2
f
f=f+2
1
1
C, DC, N, OV, Z
INC2
f,WREG
WREG = f + 2
1
1
C, DC, N, OV, Z
INC2
Ws,Wd
Wd = Ws + 2
1
1
C, DC, N, OV, Z
IOR
f
f = f .IOR. WREG
1
1
N, Z
IOR
f,WREG
WREG = f .IOR. WREG
1
1
N, Z
IOR
#lit10,Wn
Wd = lit10 .IOR. Wd
1
1
N, Z
IOR
Wb,Ws,Wd
Wd = Wb .IOR. Ws
1
1
N, Z
IOR
Wb,#lit5,Wd
Wd = Wb .IOR. lit5
1
1
N, Z
LNK
LNK
#lit14
Link Frame Pointer
1
1
None
LSR
LSR
f
f = Logical Right Shift f
1
1
C, N, OV, Z
LSR
f,WREG
WREG = Logical Right Shift f
1
1
C, N, OV, Z
LSR
Ws,Wd
Wd = Logical Right Shift Ws
1
1
C, N, OV, Z
LSR
Wb,Wns,Wnd
Wnd = Logical Right Shift Wb by Wns
1
1
N, Z
LSR
Wb,#lit5,Wnd
Wnd = Logical Right Shift Wb by lit5
1
1
N, Z
MOV
f,Wn
Move f to Wn
1
1
None
MOV
[Wns+Slit10],Wnd
Move [Wns+Slit10] to Wnd
1
1
None
MOV
f
Move f to f
1
1
N, Z
MOV
f,WREG
Move f to WREG
1
1
N, Z
MOV
#lit16,Wn
Move 16-bit Literal to Wn
1
1
None
MOV.b
#lit8,Wn
Move 8-bit Literal to Wn
1
1
None
MOV
Wn,f
Move Wn to f
1
1
None
MOV
Wns,[Wns+Slit10]
Move Wns to [Wns+Slit10]
1
1
MOV
Wso,Wdo
Move Ws to Wd
1
1
MOV
WREG,f
Move WREG to f
1
1
N, Z
MOV.D
Wns,Wd
Move Double from W(ns):W(ns+1) to Wd
1
2
None
GOTO
INC
INC2
IOR
MOV
MUL
NEG
NOP
POP
MOV.D
Ws,Wnd
Move Double from Ws to W(nd+1):W(nd)
1
2
None
MUL.SS
Wb,Ws,Wnd
{Wnd+1, Wnd} = Signed(Wb) * Signed(Ws)
1
1
None
MUL.SU
Wb,Ws,Wnd
{Wnd+1, Wnd} = Signed(Wb) * Unsigned(Ws)
1
1
None
MUL.US
Wb,Ws,Wnd
{Wnd+1, Wnd} = Unsigned(Wb) * Signed(Ws)
1
1
None
MUL.UU
Wb,Ws,Wnd
{Wnd+1, Wnd} = Unsigned(Wb) * Unsigned(Ws)
1
1
None
MUL.SU
Wb,#lit5,Wnd
{Wnd+1, Wnd} = Signed(Wb) * Unsigned(lit5)
1
1
None
MUL.UU
Wb,#lit5,Wnd
{Wnd+1, Wnd} = Unsigned(Wb) * Unsigned(lit5)
1
1
None
None
MUL
f
W3:W2 = f * WREG
1
1
NEG
f
f=f+1
1
1
C, DC, N, OV, Z
NEG
f,WREG
WREG = f + 1
1
1
C, DC, N, OV, Z
NEG
Ws,Wd
Wd = Ws + 1
1
1
C, DC, N, OV, Z
NOP
No Operation
1
1
None
NOPR
No Operation
1
1
None
None
POP
f
Pop f from Top-of-Stack (TOS)
1
1
POP
Wdo
Pop from Top-of-Stack (TOS) to Wdo
1
1
None
POP.D
Wnd
Pop from Top-of-Stack (TOS) to W(nd):W(nd+1)
1
2
None
Pop Shadow Registers
1
1
All
PUSH
f
Push f to Top-of-Stack (TOS)
1
1
None
PUSH
Wso
Push Wso to Top-of-Stack (TOS)
1
1
None
PUSH.D
Wns
Push W(ns):W(ns+1) to Top-of-Stack (TOS)
1
2
None
Push Shadow Registers
1
1
None
POP.S
PUSH
None
PUSH.S
 2015 Microchip Technology Inc.
DS30010089C-page 491
PIC24FJ256GA412/GB412 FAMILY
TABLE 35-2:
INSTRUCTION SET OVERVIEW (CONTINUED)
Assembly
Mnemonic
Assembly Syntax
Description
# of
Words
# of
Cycles
Status Flags
Affected
WDTO, SLEEP
PWRSAV
PWRSAV
#lit1
Go into Sleep or Idle mode
1
1
RCALL
RCALL
Expr
Relative Call
1
2
None
RCALL
Wn
Computed Call
1
2
None
REPEAT
#lit14
Repeat Next Instruction lit14 + 1 times
1
1
None
REPEAT
Wn
Repeat Next Instruction (Wn) + 1 times
1
1
None
REPEAT
RESET
RESET
Software Device Reset
1
1
None
RETFIE
RETFIE
Return from Interrupt
1
3 (2)
None
Return with Literal in Wn
1
3 (2)
None
Return from Subroutine
1
3 (2)
None
RETLW
RETLW
RETURN
RETURN
RLC
RLC
f
f = Rotate Left through Carry f
1
1
C, N, Z
RLC
f,WREG
WREG = Rotate Left through Carry f
1
1
C, N, Z
RLC
Ws,Wd
Wd = Rotate Left through Carry Ws
1
1
C, N, Z
RLNC
f
f = Rotate Left (No Carry) f
1
1
N, Z
RLNC
f,WREG
WREG = Rotate Left (No Carry) f
1
1
N, Z
RLNC
Ws,Wd
Wd = Rotate Left (No Carry) Ws
1
1
N, Z
RRC
f
f = Rotate Right through Carry f
1
1
C, N, Z
RRC
f,WREG
WREG = Rotate Right through Carry f
1
1
C, N, Z
RRC
Ws,Wd
Wd = Rotate Right through Carry Ws
1
1
C, N, Z
RRNC
f
f = Rotate Right (No Carry) f
1
1
N, Z
RRNC
f,WREG
WREG = Rotate Right (No Carry) f
1
1
N, Z
RRNC
Ws,Wd
Wd = Rotate Right (No Carry) Ws
1
1
N, Z
RLNC
RRC
RRNC
#lit10,Wn
SE
SE
Ws,Wnd
Wnd = Sign-Extended Ws
1
1
C, N, Z
SETM
SETM
f
f = FFFFh
1
1
None
SETM
WREG
WREG = FFFFh
1
1
None
SETM
Ws
Ws = FFFFh
1
1
None
SL
f
f = Left Shift f
1
1
C, N, OV, Z
SL
f,WREG
WREG = Left Shift f
1
1
C, N, OV, Z
SL
Ws,Wd
Wd = Left Shift Ws
1
1
C, N, OV, Z
SL
Wb,Wns,Wnd
Wnd = Left Shift Wb by Wns
1
1
N, Z
SL
Wb,#lit5,Wnd
Wnd = Left Shift Wb by lit5
1
1
N, Z
SUB
f
f = f – WREG
1
1
C, DC, N, OV, Z
SUB
f,WREG
WREG = f – WREG
1
1
C, DC, N, OV, Z
SUB
#lit10,Wn
Wn = Wn – lit10
1
1
C, DC, N, OV, Z
SUB
Wb,Ws,Wd
Wd = Wb – Ws
1
1
C, DC, N, OV, Z
SUB
Wb,#lit5,Wd
Wd = Wb – lit5
1
1
C, DC, N, OV, Z
SUBB
f
f = f – WREG – (C)
1
1
C, DC, N, OV, Z
SUBB
f,WREG
WREG = f – WREG – (C)
1
1
C, DC, N, OV, Z
SUBB
#lit10,Wn
Wn = Wn – lit10 – (C)
1
1
C, DC, N, OV, Z
SUBB
Wb,Ws,Wd
Wd = Wb – Ws – (C)
1
1
C, DC, N, OV, Z
SUBB
Wb,#lit5,Wd
Wd = Wb – lit5 – (C)
1
1
C, DC, N, OV, Z
SUBR
f
f = WREG – f
1
1
C, DC, N, OV, Z
SUBR
f,WREG
WREG = WREG – f
1
1
C, DC, N, OV, Z
SUBR
Wb,Ws,Wd
Wd = Ws – Wb
1
1
C, DC, N, OV, Z
SL
SUB
SUBB
SUBR
SUBBR
SWAP
SUBR
Wb,#lit5,Wd
Wd = lit5 – Wb
1
1
C, DC, N, OV, Z
SUBBR
f
f = WREG – f – (C)
1
1
C, DC, N, OV, Z
SUBBR
f,WREG
WREG = WREG – f – (C)
1
1
C, DC, N, OV, Z
SUBBR
Wb,Ws,Wd
Wd = Ws – Wb – (C)
1
1
C, DC, N, OV, Z
SUBBR
Wb,#lit5,Wd
Wd = lit5 – Wb – (C)
1
1
C, DC, N, OV, Z
SWAP.b
Wn
Wn = Nibble Swap Wn
1
1
None
SWAP
Wn
Wn = Byte Swap Wn
1
1
None
DS30010089C-page 492
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
TABLE 35-2:
INSTRUCTION SET OVERVIEW (CONTINUED)
Assembly
Mnemonic
Assembly Syntax
Description
# of
Words
# of
Cycles
Status Flags
Affected
TBLRDH
TBLRDH
Ws,Wd
Read Prog<23:16> to Wd<7:0>
1
2
TBLRDL
TBLRDL
Ws,Wd
Read Prog<15:0> to Wd
1
2
None
TBLWTH
TBLWTH
Ws,Wd
Write Ws<7:0> to Prog<23:16>
1
2
None
TBLWTL
TBLWTL
Ws,Wd
Write Ws to Prog<15:0>
1
2
None
ULNK
ULNK
Unlink Frame Pointer
1
1
None
XOR
XOR
f
f = f .XOR. WREG
1
1
N, Z
XOR
f,WREG
WREG = f .XOR. WREG
1
1
N, Z
XOR
#lit10,Wn
Wd = lit10 .XOR. Wd
1
1
N, Z
XOR
Wb,Ws,Wd
Wd = Wb .XOR. Ws
1
1
N, Z
XOR
Wb,#lit5,Wd
Wd = Wb .XOR. lit5
1
1
N, Z
ZE
Ws,Wnd
Wnd = Zero-Extend Ws
1
1
C, Z, N
ZE
 2015 Microchip Technology Inc.
None
DS30010089C-page 493
PIC24FJ256GA412/GB412 FAMILY
NOTES:
DS30010089C-page 494
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
36.0
ELECTRICAL CHARACTERISTICS
This section provides an overview of the PIC24FJ256GA412/GB412 family electrical characteristics. Additional
information will be provided in future revisions of this document as it becomes available.
Absolute maximum ratings for the PIC24FJ256GA412/GB412 family are listed below. Exposure to these maximum
rating conditions for extended periods may affect device reliability. Functional operation of the device at these, or any
other conditions above the parameters indicated in the operation listings of this specification, is not implied.
Absolute Maximum Ratings(†)
Ambient temperature under bias.............................................................................................................-40°C to +100°C
Storage temperature .............................................................................................................................. -65°C to +150°C
Voltage on VDD with respect to VSS ......................................................................................................... -0.3V to +4.0V
Voltage on any general purpose digital or analog pin (not 5.5V tolerant) with respect to VSS ....... -0.3V to (VDD + 0.3V)
Voltage on any general purpose digital or analog pin (5.5V tolerant, including MCLR) with respect to VSS:
When VDD = 0V: ......................................................................................................................... -0.3V to + 4.0V
When VDD  2.0V: ....................................................................................................................... -0.3V to +6.0V
Voltage on AVDD with respect to VSS ................................................... (VDD – 0.3V) to (lesser of: 4.0V or (VDD + 0.3V))
Voltage on AVSS with respect to VSS ........................................................................................................ -0.3V to +0.3V
Voltage on VBAT with respect to VSS ........................................................................................................ . -0.3V to +4.0V
Voltage on VUSB3V3 with respect to VSS ..................................................................................... (VCAP – 0.3V) to +4.0V
Voltage on VBUS with respect to VSS ....................................................................................................... -0.3V to +6.0V
Voltage on D+ or D- with respect to VSS:
(0 source impedance) (Note 1) ..............................................................................-0.5V to (VUSB3V3 + 0.5V)
(Source Impedance  28, VUSB3V3 3.0V) .............................................................................. -1.0V to +4.6V
Maximum current out of VSS pin ...........................................................................................................................300 mA
Maximum current into VDD pin (Note 2)................................................................................................................250 mA
Maximum output current sunk by any I/O pin..........................................................................................................25 mA
Maximum output current sourced by any I/O pin ....................................................................................................25 mA
Maximum current sunk by all ports .......................................................................................................................200 mA
Maximum current sourced by all ports (Note 2)....................................................................................................200 mA
Note 1:
2:
The original “USB 2.0 Specification” indicated that USB devices should withstand 24-hour short circuits of
D+ or D- to VBUS voltages. This requirement was later removed in an Engineering Change Notice (ECN)
supplement to the USB specifications, which supersedes the original specifications.
PIC24FJ256GA412/GB412 family devices will typically be able to survive this short-circuit test, but it is
recommended to adhere to the absolute maximum specified here to avoid damaging the device.
Maximum allowable current is a function of device maximum power dissipation (see Table 36-1).
† NOTICE: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the
device. This is a stress rating only and functional operation of the device at those or any other conditions above
those indicated in the operation listings of this specification is not implied. Exposure to maximum rating conditions
for extended periods may affect device reliability.
 2015 Microchip Technology Inc.
DS30010089C-page 495
PIC24FJ256GA412/GB412 FAMILY
36.1
DC Characteristics
FIGURE 36-1:
PIC24FJ256GA412/GB412 FAMILY VOLTAGE-FREQUENCY GRAPH (INDUSTRIAL)
3.6V
3.6V
Voltage (VDD)
PIC24FJXXXGX4XX
(Note 1)
(Note 1)
32 MHz
Frequency
Note 1:
TABLE 36-1:
Lower recommended operating boundary is 2.0V or VBOR (when BOR is enabled). For best
analog performance, operation above 2.2V is suggested, but not required.
THERMAL OPERATING CONDITIONS
Rating
Symbol
Min
Typ
Max
Unit
Operating Junction Temperature Range
TJ
-40
—
+100
°C
Operating Ambient Temperature Range
TA
-40
—
+85
°C
PIC24FJ256GA412/GB412 Family:
Power Dissipation:
Internal Chip Power Dissipation: PINT = VDD x (IDD –  IOH)
PD
PINT + PI/O
W
PDMAX
(TJMAX – TA)/JA
W
I/O Pin Power Dissipation:
PI/O =  ({VDD – VOH} x IOH) +  (VOL x IOL)
Maximum Allowed Power Dissipation
TABLE 36-2:
THERMAL PACKAGING CHARACTERISTICS
Characteristic
Symbol
Typ
Max
Unit
Note
Package Thermal Resistance, 12x12x1 mm 100-pin TQFP
JA
45.0
—
°C/W
(Note 1)
Package Thermal Resistance, 10x10x1 mm 64-pin TQFP
JA
48.3
—
°C/W
(Note 1)
Package Thermal Resistance, 9x9x0.9 mm 64-pin QFN
JA
28.0
—
°C/W
(Note 1)
Package Thermal Resistance, 10x10x1.1 mm 121-pin BGA
JA
40.2
—
°C/W
(Note 1)
Note 1:
Junction to ambient thermal resistance, Theta-JA (JA) numbers are achieved by package simulations.
DS30010089C-page 496
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
TABLE 36-3:
DC CHARACTERISTICS: TEMPERATURE AND VOLTAGE SPECIFICATIONS
DC CHARACTERISTICS
Param
Symbol
No.
Characteristic
Standard Operating Conditions: 2.0V to 3.6V (unless otherwise stated)
Operating temperature
-40°C  TA  +85°C for Industrial
Min
Typ
Max
Units
V
Conditions
Operating Voltage
DC10
VDD
Supply Voltage
2.0
—
3.6
VBOR
—
3.6
BOR disabled
BOR enabled
DC12
VDR
RAM Data Retention
Voltage(1)
Greater of:
VPORREL or
VBOR
—
—
V
VBOR used only if BOR is
enabled (BOREN = 1)
DC16
VPOR
VDD Start Voltage
to Ensure Internal
Power-on Reset Signal
VSS
—
—
V
(Note 2)
—
1.95
—
V
(Note 3)
0.05
—
—
V/ms
—
2.2
—
V
DC16A VPORREL VDD Power-on Reset
Release Voltage
DC17A SRVDD
Recommended
VDD Rise Skew Rate
to Ensure Internal
Power-on Reset Signal
DC17B VBOR
Brown-out Reset
Voltage on VDD Transition,
High-to-Low
Note 1:
2:
3:
0-3.3V in 66 ms,
0-2.5V in 50 ms
(Note 2)
(Note 3)
This is the limit to which VDD may be lowered and the RAM contents will always be retained.
If the VPOR or SRVDD parameters are not met, or the application experiences slow power-down VDD ramp
rates, it is recommended to enable and use the BOR.
On a rising VDD power-up sequence, application firmware execution begins at the higher of the VPORREL or
VBOR level (when BOREN = 1).
 2015 Microchip Technology Inc.
DS30010089C-page 497
PIC24FJ256GA412/GB412 FAMILY
TABLE 36-4:
DC CHARACTERISTICS: OPERATING CURRENT (IDD)
Standard Operating Conditions: 2.0V to 3.6V (unless otherwise stated)
Operating temperature
-40°C  TA  +85°C for Industrial
DC CHARACTERISTICS
Parameter
No.
Typical(1)
Max
Units
Operating
Temperature
VDD
Conditions
Operating Current (IDD)(2)
DC19
DC20
DC23
DC24
DC31
Note 1:
2:
0.17
0.4
mA
-40°C to +85°C
2.0V
0.19
0.4
mA
-40°C to +85°C
3.3V
0.28
0.7
mA
-40°C to +85°C
2.0V
0.31
0.7
mA
-40°C to +85°C
3.3V
0.90
2.5
mA
-40°C to +85°C
2.0V
1.00
2.5
mA
-40°C to +85°C
3.3V
5.13
9
mA
-40°C to +85°C
2.0V
5.28
9
mA
-40°C to +85°C
3.3V
24.4
100
A
-40°C to +85°C
2.0V
24.5
110
A
-40°C to +85°C
3.3V
0.5 MIPS,
FOSC = 1 MHz
1 MIPS,
FOSC = 2 MHz
4 MIPS,
FOSC = 8 MHz
16 MIPS,
FOSC = 32 MHz
LPRC (15.5 KIPS),
FOSC = 31 kHz
Data in the “Typical” column is at 3.3V, +25°C unless otherwise stated. Typical parameters are for design
guidance only and are not tested.
The supply current is mainly a function of the operating voltage and frequency. Other factors, such as I/O
pin loading and switching rate, oscillator type, internal code execution pattern and temperature, also have
an impact on the current consumption. No peripheral modules are operating and all of the Peripheral
Module Disable x (PMDx) bits are set.
TABLE 36-5:
DC CHARACTERISTICS: IDLE CURRENT (IIDLE)
Standard Operating Conditions: 2.0V to 3.6V (unless otherwise stated)
Operating temperature
-40°C  TA  +85°C for Industrial
DC CHARACTERISTICS
Parameter
No.
Typical(1)
Max
Units
Operating
Temperature
VDD
Conditions
Idle Current (IIDLE)
DC40
DC43
DC47
DC50
DC51
Note 1:
130
180
A
-40°C to +85°C
2.0V
180
200
A
-40°C to +85°C
3.3V
0.33
0.7
mA
-40°C to +85°C
2.0V
0.44
0.8
mA
-40°C to +85°C
3.3V
1.54
2.2
mA
-40°C to +85°C
2.0V
1.67
2.3
mA
-40°C to +85°C
3.3V
0.56
0.8
mA
-40°C to +85°C
2.0V
0.56
0.9
mA
-40°C to +85°C
3.3V
18.76
90
A
-40°C to +85°C
2.0V
19.30
100
A
-40°C to +85°C
3.3V
1 MIPS,
FOSC = 2 MHz
4 MIPS,
FOSC = 8 MHz
16 MIPS,
FOSC = 32 MHz
4 MIPS (FRC),
FOSC = 8 MHz
LPRC (15.5 KIPS),
FOSC = 31 kHz
Data in the “Typical” column is at 3.3V, +25°C unless otherwise stated. Parameters are for design
guidance only and are not tested.
DS30010089C-page 498
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
TABLE 36-6:
DC CHARACTERISTICS: POWER-DOWN CURRENT (IPD)
Standard Operating Conditions: 2.0V to 3.6V (unless otherwise stated)
Operating temperature
-40°C  TA  +85°C for Industrial
DC CHARACTERISTICS
Parameter
Typical(1)
No.
Max
Units
Operating
Temperature
Conditions
VDD
Power-Down Current (IPD)
DC60
DC61
DC70
DC74
Note 1:
2:
3:
4:
3.24
—
A
-40°C
4.08
22
A
+25°C
7.81
—
A
+60°C
23.25
40
A
+85°C
3.20
—
A
-40°C
4.07
25
A
+25°C
7.94
—
A
+60°C
19.85
42
A
+85°C
0.07
—
A
-40°C
0.07
—
A
+25°C
3.54
—
A
+60°C
15.30
—
A
+85°C
0.10
—
A
-40°C
0.06
—
A
+25°C
3.68
—
A
+60°C
15.65
—
A
+85°C
120
—
nA
-40°C
80
800
nA
+25°C
620
—
nA
+60°C
1.13
5
A
+85°C
110
—
nA
-40°C
110
1500
nA
+25°C
830
—
nA
+60°C
3.67
10
A
+85°C
0.6
3
A
-40°C to +85°C
2.0V
Sleep(2)
3.3V
2.0V
Low-Voltage Sleep(3)
3.3V
2.0V
3.3V
0V
Deep Sleep, capacitor on VCAP is
fully discharged
RTCC with VBAT mode (LPRC/SOSC)(4)
Data in the “Typical” column is at 3.3V, +25°C unless otherwise stated. Parameters are for design
guidance only and are not tested.
The low-voltage/retention regulator is disabled; RETEN (RCON<12>) = 0, LPCFG (FPOR<2>) = 1.
The low-voltage/retention regulator is enabled; RETEN (RCON<12>) = 1, LPCFG (FPOR<2>) = 0.
The VBAT pin is connected to the battery and RTCC is running with VDD = 0.
 2015 Microchip Technology Inc.
DS30010089C-page 499
PIC24FJ256GA412/GB412 FAMILY
TABLE 36-7:
DC CHARACTERISTICS: CURRENT (BOR, WDT, DSBOR, DSWDT, LCD)
Standard Operating Conditions: 2.0V to 3.6V (unless otherwise stated)
Operating temperature
-40°C  TA  +85°C for Industrial
DC CHARACTERISTICS
Parameter
No.
Typical(1)
Max
Units
Operating
Temperature
VDD
Conditions
Incremental Current Brown-out Reset (BOR)(2)
DC25
4
8
A
-40°C to +85°C
VBOR
4
8
A
-40°C to +85°C
3.3V
BOR(2)
Incremental Current Watchdog Timer (WDT)(2)
DC71
0.15
2
A
-40°C to +85°C
2.0V
0.24
2
A
-40°C to +85°C
3.3V
WDT (with LPRC selected)(2)
Incremental Current HLVD (HLVD)(2)
DC75
3.8
25
A
-40°C to +85°C
2.0V
3.8
25
A
-40°C to +85°C
3.3V
HLVD(2)
Incremental Current Real-Time Clock and Calendar (RTCC)(2)
DC77
DC77A
0.17
2.5
A
-40°C to +85°C
2.0V
0.17
2.5
A
-40°C to +85°C
3.3V
0.55
2.5
A
-40°C to +85°C
2.0V
0.55
2.5
A
-40°C to +85°C
3.3V
RTCC (with SOSC)(2)
RTCC (with LPRC)(2)
Incremental Current Deep Sleep BOR (DSBOR)(2)
DC81
0.1
0.9
A
-40°C to +85°C
2.0V
0.1
0.9
A
-40°C to +85°C
3.3V
Deep Sleep BOR(2)
Incremental Current Deep Sleep Watchdog Timer (DSWDT)(2)
DC80
0.1
0.9
A
-40°C to +85°C
2.0V
0.1
0.9
A
-40°C to +85°C
3.3V
2
—
A
-40°C to +85°C
3.3V
VBAT = 2V
5
—
A
-40°C to +85°C
3.3V
VBAT = 3.3V
A
+25°C
2.0V
(LCD)/LCD internal (2)(4)
1/8 MUX, 1/3 bias
Deep Sleep WDT(2)
VBAT A/D Monitor(5)
DC91
Incremental Current LCD (LCD)
DC82
5
5
—
A
+25°C
3.3V
DC90
6
—
A
+25°C
2.0V
6
—
A
+25°C
3.3V
Note 1:
2:
3:
4:
5:
—
(LCD)/LCD charge pump(2)(3)
1/8 MUX, 1/3 bias
Data in the “Typical” column is at 3.3V, +25°C unless otherwise stated. Parameters are for design
guidance only and are not tested.
Incremental current while the module is enabled and running.
LCD is enabled and running, no glass is connected; the resistor ladder current is not included.
LCD is enabled and running, no glass is connected; the low power resistor ladder current is included.
The A/D channel is connected to the VBAT pin internally; this is the current during A/D VBAT operation.
DS30010089C-page 500
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
TABLE 36-8:
DC CHARACTERISTICS: I/O PIN INPUT SPECIFICATIONS
Standard Operating Conditions: 2.0V to 3.6V (unless otherwise stated)
Operating temperature
-40°C  TA  +85°C for Industrial
DC CHARACTERISTICS
Param
No.
Sym
VIL
Characteristic
Min
Typ(1)
Max
Units
Conditions
Input Low Voltage(3)
DI10
I/O Pins with ST Buffer
VSS
—
0.2 VDD
V
DI11
I/O Pins with TTL Buffer
VSS
—
0.15 VDD
V
DI15
MCLR
VSS
—
0.2 VDD
V
DI16
OSCI (XT mode)
VSS
—
0.2 VDD
V
DI17
OSCI (HS mode)
VSS
—
0.2 VDD
V
2
DI18
I/O Pins with I C Buffer
VSS
—
0.3 VDD
V
DI19
I/O Pins with SMBus Buffer
VSS
—
0.8
V
I/O Pins with ST Buffer:
without 5V Tolerance
with 5V Tolerance
0.65 VDD
0.65 VDD
—
—
VDD
5.5
V
V
I/O Pins with TTL Buffer:
without 5V Tolerance
with 5V Tolerance
0.25 VDD + 0.8
0.25 VDD + 0.8
—
—
VDD
5.5
V
V
MCLR
0.8 VDD
—
VDD
V
DI26
OSCI (XT mode)
0.7 VDD
—
VDD
V
DI27
OSCI (HS mode)
0.7 VDD
—
VDD
V
DI28
I/O Pins with
I2C
0.7 VDD
—
5.5
V
DI29
I/O Pins with SMBus Buffer
2.1
—
5.5
V
SMBus enabled
CNx Pull-up Current
150
550
550
A
VDD = 3.3V, VPIN = VSS
CNx Pull-Down Current
15
150
150
A
VDD = 3.3V, VPIN = VDD
VIH
DI20
DI21
DI25
DI30
ICNPU
DI30A ICNPD
IIL
Input High
SMBus enabled
Voltage(3)
Input Leakage
Buffer
Current(2)
DI50
I/O Ports
—
—
±1
A
VSS  VPIN  VDD,
pin at high-impedance
DI51
Analog Input Pins
—
—
±1
A
VSS  VPIN  VDD,
pin at high-impedance
DI55
MCLR
—
—
±1
A
VSS VPIN VDD
DI56
OSCI/CLKI
—
—
±1
A
VSS VPIN VDD,
EC, XT and HS modes
Note 1:
2:
3:
Data in the “Typ” column is at 3.3V, +25°C unless otherwise stated. Parameters are for design guidance
only and are not tested.
Negative current is defined as current sourced by the pin.
Refer to Table 1-4 or Table 1-5 for I/O pin buffer types.
 2015 Microchip Technology Inc.
DS30010089C-page 501
PIC24FJ256GA412/GB412 FAMILY
TABLE 36-9:
DC CHARACTERISTICS: I/O PIN OUTPUT SPECIFICATIONS
DC CHARACTERISTICS
Param
Symbol
No.
VOL
DO10
OSCO/CLKO
VOH
DO20
Typ(1)
Max
Units
Conditions
—
—
0.4
V
IOL = 6.6 mA, VDD = 3.6V
—
—
0.4
V
IOL = 5.0 mA, VDD = 2V
—
—
0.4
V
IOL = 6.6 mA, VDD = 3.6V
—
—
0.4
V
IOL = 5.0 mA, VDD = 2V
3.0
—
—
V
IOH = -3.0 mA, VDD = 3.6V
Output High Voltage
I/O Ports
DO26
Min
Output Low Voltage
I/O Ports
DO16
Note 1:
Characteristic
Standard Operating Conditions: 2.0V to 3.6V (unless otherwise stated)
Operating temperature
-40°C  TA  +85°C for Industrial
OSCO/CLKO
2.4
—
—
V
IOH = -6.0 mA, VDD = 3.6V
1.65
—
—
V
IOH = -1.0 mA, VDD = 2V
1.4
—
—
V
IOH = -3.0 mA, VDD = 2V
2.4
—
—
V
IOH = -6.0 mA, VDD = 3.6V
1.4
—
—
V
IOH = -1.0 mA, VDD = 2V
Data in the “Typ” column is at 3.3V, +25°C unless otherwise stated.
TABLE 36-10: DC CHARACTERISTICS: PROGRAM MEMORY
DC CHARACTERISTICS
Param
Symbol
No.
Characteristic
Standard Operating Conditions: 2.0V to 3.6V (unless otherwise stated)
Operating temperature
-40°C  TA  +85°C for Industrial
Min
Typ(1)
Max
Units
Conditions
Program Flash Memory
D130
EP
Cell Endurance
20000
—
—
E/W
D131
VPR
VDD for Read
VMIN
—
3.6
V
VMIN = Minimum operating voltage
D132B
VDD for Self-Timed Write
VMIN
—
3.6
V
VMIN = Minimum operating voltage
D133A TIW
Self-Timed Word Write
Cycle Time
—
20
—
s
Self-Timed Row Write
Cycle Time
—
1.5
—
ms
D133B TIE
Self-Timed Page Erase
Time
20
—
40
ms
D134
TRETD
Characteristic Retention
20
—
—
Year
D135
IDDP
Supply Current During
Programming
—
5
—
mA
Note 1:
-40C to +85C
If no other specifications are violated
Data in the “Typ” column is at 3.3V, +25°C unless otherwise stated.
DS30010089C-page 502
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
TABLE 36-11: INTERNAL VOLTAGE REGULATOR SPECIFICATIONS
Operating Conditions: -40°C < TA < +85°C (unless otherwise stated)
Param
No.
Symbol
Characteristics
Min
Typ
Max
Units
Comments
DVR10 VBG
Internal Band Gap Reference
—
1.2
—
V
DVR11 TBG
Band Gap Reference Start-up
Time
—
1
—
ms
DVR20 VRGOUT
Regulator Output Voltage
—
1.8
—
V
VDD > 2.0V
DVR21 CEFC
External Filter Capacitor Value
4.7
10
—
F
Series Resistance < 3
recommended; < 5 required.
DVR
Start-up Time
—
10
—
s
PMSLP = 1 with any POR or BOR
Low-Voltage Regulator Output
Voltage
—
1.2
—
V
RETEN = 1, LPCFG = 0
TVREG
DVR30 VLVR
TABLE 36-12: VBAT OPERATING VOLTAGE SPECIFICATIONS
Param
Symbol
No.
Characteristic
Typ
Max
Units
1.6
—
3.6
V
Battery connected to the
VBAT pin, VBTBOR = 0
VBATBOR
—
3.6
V
Battery connected to the
VBAT pin, VBTBOR = 1
1.6
—
3.6
V
A/D is monitoring the VBAT
pin using the internal A/D
channel
Operating Voltage
DVB01 VBT
DVB02
DVB10 VBTADC
Note 1:
Min
VBAT A/D Monitoring Voltage
Specification(1)
Comments
Measuring the A/D value using the A/D is represented by the equation:
Measured Voltage = ((VBAT/2)/VDD) * 4096) for 12-bit A/D.
TABLE 36-13: CTMU CURRENT SOURCE SPECIFICATIONS
DC CHARACTERISTICS
Param
No.
Sym
Characteristic
Standard Operating Conditions: 2.0V to 3.6V (unless otherwise stated)
Operating temperature
-40°C  TA  +85°C for Industrial
Min
Typ(1) Max
Units
Comments
Conditions
DCT10 IOUT1 CTMU Current
Source, Base Range
—
550
—
nA
CTMUCON1L<1:0> = 00
DCT11 IOUT2 CTMU Current
Source, 10x Range
—
5.5
—
A
CTMUCON1L<1:0> = 01
DCT12 IOUT3 CTMU Current
Source, 100x Range
—
55
—
A
CTMUCON1L<1:0> = 10
DCT13 IOUT4 CTMU Current
Source, 1000x Range
—
550
—
A
CTMUCON1L<1:0> = 11(2)
DCT21 V
—
-3
—
mV/°C
Note 1:
2:
Temperature Diode
Voltage Change per
Degree Celsius
2.5V < VDD < VDDMAX
Nominal value at center point of current trim range (CTMUCON1L<7:2> = 000000).
Do not use this current range with temperature sensing diode.
 2015 Microchip Technology Inc.
DS30010089C-page 503
PIC24FJ256GA412/GB412 FAMILY
TABLE 36-14: USB ON-THE-GO MODULE SPECIFICATIONS
Standard Operating Conditions: 2.0V to 3.6V (unless otherwise stated)
Operating temperature
-40°C  TA  +85°C for Industrial
DC CHARACTERISTICS
Param
Symbol
No.
Characteristic
Min
Typ
Max
Units
Conditions
Greater of:
3.0 or
(VDD – 0.3V)
3.3
3.6
V
USB module enabled
(VDD – 0.3V)(1)
—
3.6
V
USB disabled, RG2/RG3
are unused and externally
pulled low or left in a
high-impedance state
(VDD – 0.3V)
VDD
3.6
V
USB disabled, RG2/RG3
are used as general
purpose I/Os
Operating Voltage
DUS01 VUSB3V3 USB Supply Voltage
Note 1:
The VUSB3V3 pin may also be left in a high-impedance state under these conditions. However, if the voltage floats below (VDD – 0.3V), this may result in higher IPD currents than specified. The preferred method
is to tie the VUSB pin to VDD, even if the USB module is not used.
TABLE 36-15: HIGH/LOW-VOLTAGE DETECT CHARACTERISTICS
Operating Conditions: -40°C < TA < +85°C (unless otherwise stated)
Param
Symbol
No.
DC18
VHLVD
DC101 VTHL
Note 1:
Characteristic
HLVD Voltage on VDD
Transition
HLVD Voltage on
LVDIN Pin Transition
Min
Typ
Max
Units
HLVDL<3:0> = 0100(1)
3.45
—
3.73
V
HLVDL<3:0> = 0101
3.30
—
3.57
V
HLVDL<3:0> = 0110
3.00
—
3.25
V
HLVDL<3:0> = 0111
2.80
—
3.03
V
HLVDL<3:0> = 1000
2.67
—
2.92
V
HLVDL<3:0> = 1001
2.45
—
2.70
V
HLVDL<3:0> = 1010
2.33
—
2.60
V
HLVDL<3:0> = 1011
2.21
—
2.49
V
HLVDL<3:0> = 1100
2.11
—
2.38
V
HLVDL<3:0> = 1101
2.10
—
2.25
V
HLVDL<3:0> = 1110
2.00
—
2.15
V
HLVDL<3:0> = 1111
—
1.20
—
V
Conditions
Trip points for values of HLVD<3:0>, from ‘0000’ to ‘0011’, are not implemented.
DS30010089C-page 504
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
TABLE 36-16: COMPARATOR DC SPECIFICATIONS
Operating Conditions: 2.0V < VDD < 3.6V, -40°C < TA < +85°C (unless otherwise stated)
Param
No.
Symbol
Characteristic
Min
Typ
Max
Units
Comments
D300
VIOFF
Input Offset Voltage
—
12
±30
mV
D301
VICM
Input Common-Mode Voltage
0
—
VDD
V
D302
CMRR
Common-Mode Rejection
Ratio
55
—
—
dB
D306
IQCMP
AVDD Quiescent Current
per Comparator
—
27
—
µA
Comparator enabled
D307
TRESP
Response Time
—
300
—
ns
(Note 1)
D308
TMC2OV
Comparator Mode Change to
Valid Output
—
10
—
µs
Note 1:
Measured with one input at VDD/2 and the other transitioning from VSS to VDD, 40 mV step,
15 mV overdrive.
TABLE 36-17: COMPARATOR VOLTAGE REFERENCE DC SPECIFICATIONS
Operating Conditions: 2.0V < VDD < 3.6V, -40°C < TA < +85°C (unless otherwise stated)
Param
No.
Symbol
Characteristic
VR310
TSET
Settling Time
VRD311
CVRAA
Absolute Accuracy
VRD312 CVRUR
Note 1:
Unit Resistor Value (R)
Min
Typ
Max
Units
—
—
10
µs
-100
—
100
mV
—
4.5
—
k
Comments
(Note 1)
Measures the interval while CVR<4:0> transitions from ‘11111’ to ‘00000’.
 2015 Microchip Technology Inc.
DS30010089C-page 505
PIC24FJ256GA412/GB412 FAMILY
36.2
AC Characteristics and Timing Parameters
The information contained in this section defines the PIC24FJ256GA412/GB412 family AC characteristics and timing
parameters.
TABLE 36-18: TEMPERATURE AND VOLTAGE SPECIFICATIONS – AC
Standard Operating Conditions: 2.0V to 3.6V (unless otherwise stated)
Operating temperature
-40°C  TA  +85°C for Industrial
Operating voltage VDD range as described in Section 36.1 “DC Characteristics”.
AC CHARACTERISTICS
FIGURE 36-2:
LOAD CONDITIONS FOR DEVICE TIMING SPECIFICATIONS
Load Condition 1 – for all pins except OSCO
Load Condition 2 – for OSCO
VDD/2
CL
Pin
RL
VSS
CL
Pin
RL = 464
CL = 50 pF for all pins except OSCO
15 pF for OSCO output
VSS
TABLE 36-19: CAPACITIVE LOADING REQUIREMENTS ON OUTPUT PINS
Param
Symbol
No.
Characteristic
Min
Typ(1)
Max
Units
Conditions
DO50
COSCO
OSCO/CLKO Pin
—
—
15
pF
In XT and HS modes when
external clock is used to drive
OSCI
DO56
CIO
All I/O Pins and OSCO
—
—
50
pF
EC mode
DO58
CB
SCLx, SDAx
—
—
400
pF
In I2C mode
Note 1:
Data in the “Typ” column is at 3.3V, +25°C unless otherwise stated.
DS30010089C-page 506
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
FIGURE 36-3:
EXTERNAL CLOCK TIMING
Q4
Q1
Q2
Q3
Q4
Q1
Q2
Q3
Q4
OS30
OS30
Q1
Q2
Q3
OSCI
OS20
OS31
OS31
OS25
CLKO
OS40
OS41
TABLE 36-20: EXTERNAL CLOCK TIMING REQUIREMENTS
AC CHARACTERISTICS
Param
Symbol
No.
Standard Operating Conditions: 2.0V to 3.6V (unless otherwise stated)
Operating temperature
-40°C  TA  +85°C for Industrial
Characteristic
Min
Typ(1)
Max
Units
External CLKI Frequency
(External clocks allowed
only in EC mode)
DC
1.97
—
—
32
48
MHz
MHz
EC
ECPLL (Note 2)
Oscillator Frequency
3.5
4
10
12
31
—
—
—
—
—
10
8
32
32
33
MHz
MHz
MHz
MHz
kHz
XT
XTPLL
HS
HSPLL
SOSC
OS20 TOSC
TOSC = 1/FOSC
—
—
—
—
OS25 TCY
Instruction Cycle Time(3)
62.5
—
DC
ns
OS30 TosL,
TosH
External Clock in (OSCI)
High or Low Time
0.45 x TOSC
—
—
ns
EC
OS31 TosR,
TosF
External Clock in (OSCI)
Rise or Fall Time
—
—
20
ns
EC
OS40 TckR
CLKO Rise Time(4)
—
6
10
ns
OS41 TckF
CLKO Fall Time(4)
—
6
10
ns
OS10 FOSC
Note 1:
2:
3:
4:
Conditions
See Parameter OS10 for
FOSC value
Data in the “Typ” column is at 3.3V, +25°C unless otherwise stated.
Represents input to the system clock prescaler. PLL dividers and postscalers must still be configured so
that the system clock frequency does not exceed the maximum frequency shown in Figure 36-1.
Instruction cycle period (TCY) equals two times the input oscillator time base period. All specified values are
based on characterization data for that particular oscillator type, under standard operating conditions, with
the device executing code. Exceeding these specified limits may result in an unstable oscillator operation
and/or higher than expected current consumption. All devices are tested to operate at “Min.” values with an
external clock applied to the OSCI/CLKI pin. When an external clock input is used, the “Max.” cycle time
limit is “DC” (no clock) for all devices.
Measurements are taken in EC mode. The CLKO signal is measured on the OSCO pin. CLKO is low for the
Q1-Q2 period (1/2 TCY) and high for the Q3-Q4 period (1/2 TCY).
 2015 Microchip Technology Inc.
DS30010089C-page 507
PIC24FJ256GA412/GB412 FAMILY
TABLE 36-21: PLL CLOCK TIMING SPECIFICATIONS
Standard Operating Conditions: 2.0V to 3.6V (unless otherwise stated)
Operating temperature
-40°C  TA  +85°C for Industrial
AC CHARACTERISTICS
Param
Symbol
No.
Characteristic
OS50
FPLLI
PLL Input Frequency
Range(1)
OS52
TLOCK
PLL Start-up Time
(Lock Time)
OS53
DCLK
CLKO Stability (Jitter)
Note 1:
Min
Typ
Max
Units
1.97
4
4.04
MHz
—
—
128
s
-0.25
—
0.25
%
Conditions
ECPLL, XTPLL, HSPLL or
FRCPLL modes
The PLL accepts a 1.97 MHz to 4.04 MHz input frequency. Higher input frequencies, up to 48 MHz, may be
supplied to the PLL if they are prescaled down by the PLLMODE<3:0> Configuration bits into the 1.97 MHz
to 4.04 MHz range.
TABLE 36-22: INTERNAL RC ACCURACY
AC CHARACTERISTICS
Param
No.
F20
Standard Operating Conditions: 2.0V to 3.6V (unless otherwise stated)
Operating temperature
-40°C  TA  +85°C for Industrial
Characteristic
Min
Typ
Max
Units
FRC Accuracy @ 8 MHz(4)
-1
±0.15
1
%
2.0V  VDD 3.6V, 0°C  TA +85°C
(Note 1)
-1.5
—
1.5
%
2.0V  VDD 3.6V, -40°C  TA <0°C
-0.20
±0.05
0.20
%
2.0V  VDD 3.6V, -40°C  TA +85°C,
self-tune is enabled and locked (Note 2)
F21
LPRC @ 31 kHz
-20
—
20
%
F22
OSCTUN Step-Size
—
0.05
—
%/bit
F23
FRC Self-Tune Lock Time
—
<5
8
ms
Note 1:
2:
3:
4:
Conditions
(Note 3)
To achieve this accuracy, physical stress applied to the microcontroller package (ex., by flexing the PCB)
must be kept to a minimum.
Accuracy measured with respect to reference source accuracy.
Time from when the reference clock is stable and in range until the FRC is tuned within the range specified
by F20 (with self-tune).
Other frequencies that are derived from the FRC (either through digital division by prescalers or multiplication
through a PLL) will also have the same accuracy tolerance specifications as provided here.
TABLE 36-23: RC OSCILLATOR START-UP TIME
AC CHARACTERISTICS
Param
Symbol
No.
Characteristic
Standard Operating Conditions: 2.0V to 3.6V (unless otherwise stated)
Operating temperature
-40°C  TA  +85°C for Industrial
Min
Typ
Max
Units
FR0
TFRC
FRC Oscillator Start-up
Time
—
15
—
s
FR1
TLPRC
Low-Power RC Oscillator
Start-up Time
—
50
—
s
DS30010089C-page 508
Conditions
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
FIGURE 36-4:
CLKO AND I/O TIMING CHARACTERISTICS
I/O Pin
(Input)
DI35
DI40
I/O Pin
(Output)
Old Value
New Value
DO31
DO32
Note:
Refer to Figure 36-2 for load conditions.
TABLE 36-24: CLKO AND I/O TIMING REQUIREMENTS
AC CHARACTERISTICS
Param
Symbol
No.
Standard Operating Conditions: 2.0V to 3.6V (unless otherwise stated)
Operating temperature
-40°C  TA  +85°C for Industrial
Characteristic
Min
Typ(1)
Max
Units
Port Output Rise Time
—
5
25
ns
DO31
TIOR
DO32
TIOF
Port Output Fall Time
—
5
25
ns
DI35
TINP
INTx Pin High or Low
Time (input)
20
—
—
ns
DI40
TRBP
CNx High or Low Time
(input)
2
—
—
TCY
Note 1:
Conditions
Data in the “Typ” column is at 3.3V, +25°C unless otherwise stated.
 2015 Microchip Technology Inc.
DS30010089C-page 509
PIC24FJ256GA412/GB412 FAMILY
TABLE 36-25: RESET AND BROWN-OUT RESET REQUIREMENTS
AC CHARACTERISTICS
Param
Symbol
No.
Characteristic
Standard Operating Conditions: 2.0V to 3.6V (unless otherwise stated)
Operating temperature
-40°C  TA  +85°C for Industrial
Min
Typ
Max
Units
SY10
TMCL
MCLR Pulse Width (Low)
2
—
—
s
SY12
TPOR
Power-on Reset Delay
—
2
—
s
SY13
TIOZ
I/O High-Impedance from
MCLR Low or Watchdog
Timer Reset
Lesser of:
(3 TCY + 2)
or 700
—
(3 TCY + 2)
s
SY25
TBOR
Brown-out Reset Pulse
Width
1
—
—
s
Conditions
VDD VBOR
SY45
TRST
Internal State Reset Time
—
50
—
s
SY70
TDSWU
Deep Sleep Wake-up
Time
—
200
—
s
VCAP fully discharged
before wake-up
SY71
TPM
Program Memory
Wake-up Time
—
20
—
s
Sleep wake-up with
PMSLP = 0
—
1
—
s
Sleep wake-up with
PMSLP = 1
—
90
—
s
Sleep wake-up with
PMSLP = 0
—
70
—
s
Sleep wake-up with
PMSLP = 1
SY72
TLVR
Low-Voltage Regulator
Wake-up Time
DS30010089C-page 510
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
FIGURE 36-5:
TIMER1/2/3/4/5 EXTERNAL CLOCK INPUT TIMING
TxCK Pin
TtL
TtH
TtP
TABLE 36-26: TIMER1/2/3/4/5 EXTERNAL CLOCK INPUT REQUIREMENTS(1)
Param.
No.
Symbol
TtH
TtL
TtP
Characteristic
Min
Max
Units
TxCK High Pulse Time Synchronous w/Prescaler
TCY + 20
—
ns
10
—
ns
Asynchronous Counter
20
—
ns
TCY + 20
—
ns
TxCK Low Pulse Time Synchronous w/Prescaler
TxCK External Input
Period
Delay for Input Edge
to Timer Increment
Note 1:
Asynchronous w/Prescaler
Asynchronous w/Prescaler
10
—
ns
Asynchronous Counter
20
—
ns
Synchronous w/Prescaler
2 * TCY + 40
—
ns
Asynchronous w/Prescaler
Greater of:
20 or
2 * TCY + 40
N
—
ns
Asynchronous Counter
40
—
ns
Synchronous
1
2
TCY
Asynchronous
—
20
ns
Conditions
Must also meet
Parameter TtP
Must also meet
Parameter TtP
N = Prescale Value
(1, 4, 8, 16)
Asynchronous mode is available only on Timer1.
 2015 Microchip Technology Inc.
DS30010089C-page 511
PIC24FJ256GA412/GB412 FAMILY
FIGURE 36-6:
INPUT CAPTURE x TIMINGS
ICx Pin
(Input Capture Mode)
IC10
IC11
IC15
TABLE 36-27: INPUT CAPTURE x TIMINGS REQUIREMENTS
Param.
Symbol
No.
Characteristic
IC10
TccL
ICx Input Low Time –
Synchronous Timer
IC11
TccH
ICx Input Low Time –
Synchronous Timer
IC15
TccP
ICx Input Period – Synchronous Timer
FIGURE 36-7:
No Prescaler
With Prescaler
No Prescaler
With Prescaler
Min
Max
Units
TCY + 20
—
ns
20
—
ns
TCY + 20
—
ns
20
—
ns
2 * TCY + 40
N
—
ns
Conditions
Must also meet
Parameter IC15
Must also meet
Parameter IC15
N = Prescale
Value (1, 4, 16)
OUTPUT COMPARE x TIMINGS
OCx
(Output Compare or PWM Mode)
OC11
TABLE 36-28:
OUTPUT COMPARE 1 TIMINGS
Param.
No.
Symbol
OC11
TCCR
OC10
TCCF
OC10
Characteristic
OC1 Output Rise Time
OC1 Output Fall Time
DS30010089C-page 512
Min
Max
Unit
—
10
ns
—
—
ns
—
10
ns
—
—
ns
Condition
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
FIGURE 36-8:
PWMx MODULE TIMING REQUIREMENTS
OC20
OCFx
OC15
PWMx
TABLE 36-29: PWMx TIMING REQUIREMENTS
Param.
Symbol
No.
Characteristic
Min
Typ(1)
Max
Unit
Condition
OC15
TFD
Fault Input to PWM I/O Change
—
—
25
ns
VDD = 3.0V, -40C to +85C
OC20
TFH
Fault Input Pulse Width
50
—
—
ns
VDD = 3.0V, -40C to +85C
Note 1: Data in “Typ” column is at 3.3V, +25C unless otherwise stated. These parameters are for design guidance
only and are not tested.
 2015 Microchip Technology Inc.
DS30010089C-page 513
PIC24FJ256GA412/GB412 FAMILY
FIGURE 36-9:
I2Cx BUS START/STOP BITS TIMING CHARACTERISTICS (MASTER MODE)
SCLx
IM31
IM34
IM30
IM33
SDAx
Stop
Condition
Start
Condition
TABLE 36-30: I2Cx BUS START/STOP BITS TIMING REQUIREMENTS (MASTER MODE)
Standard Operating Conditions: 2.0V to 3.6V
(unless otherwise stated)
Operating temperature -40°C  TA  +85°C for Industrial
AC CHARACTERISTICS
Param
Symbol
No.
IM30
TSU:STA
Start Condition
Setup Time
THD:STA Start Condition
Hold Time
IM31
TSU:STO Stop Condition
Setup Time
IM33
Min(1)
Max
Units
100 kHz mode
TCY/2 (BRG + 1)
—
s
400 kHz mode
TCY/2 (BRG + 1)
—
s
1 MHz mode(2)
TCY/2 (BRG + 1)
—
s
100 kHz mode
TCY/2 (BRG + 1)
—
s
400 kHz mode
TCY/2 (BRG + 1)
—
s
1 MHz mode(2)
TCY/2 (BRG + 1)
—
s
100 kHz mode
TCY/2 (BRG + 1)
—
s
400 kHz mode
TCY/2 (BRG + 1)
—
s
mode(2)
TCY/2 (BRG + 1)
—
s
100 kHz mode
TCY/2 (BRG + 1)
—
ns
400 kHz mode
TCY/2 (BRG + 1)
—
ns
1 MHz mode(2)
TCY/2 (BRG + 1)
—
ns
Characteristic
1 MHz
THD:STO Stop Condition
Hold Time
IM34
Note 1:
2:
Conditions
Only relevant for
Repeated Start
condition
After this period, the
first clock pulse is
generated
I2 C
BRG is the value of the
Baud Rate Generator. Refer to Section 18.2 “Setting Baud Rate When
Operating as a Bus Master” for details.
Maximum Pin Capacitance = 10 pF for all I2C pins (for 1 MHz mode only).
DS30010089C-page 514
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
FIGURE 36-10:
I2Cx BUS DATA TIMING CHARACTERISTICS (MASTER MODE)
IM11
IM21
SCLx
IM10
IM20
IM26
IM25
SDAx
In
IM45
IM40
SDAx
Out
TABLE 36-31: I2Cx BUS DATA TIMING REQUIREMENTS (MASTER MODE)
Standard Operating Conditions: 2.0V to 3.6V
(unless otherwise stated)
Operating temperature -40°C  TA  +85°C for Industrial
AC CHARACTERISTICS
Param
No.
IM10
Symbol
TLO:SCL
THI:SCL
IM11
Characteristic
Min(1)
Max
Units
Clock Low Time 100 kHz mode
TCY/2 (BRG + 1)
—
s
400 kHz mode
TCY/2 (BRG + 1)
—
s
1 MHz mode(2)
TCY/2 (BRG + 1)
—
s
Clock High Time 100 kHz mode
TCY/2 (BRG + 1)
—
s
400 kHz mode
TCY/2 (BRG + 1)
—
s
mode(2)
TCY/2 (BRG + 1)
—
s
—
300
ns
1 MHz
TF:SCL
IM20
SDAx and SCLx 100 kHz mode
Fall Time
400 kHz mode
1 MHz mode(2)
TR:SCL
IM21
TSU:DAT
IM25
IM26
THD:DAT
IM40
TAA:SCL
IM45
TBF:SDA
SDAx and SCLx 100 kHz mode
Rise Time
400 kHz mode
Data Input
Setup Time
Data Input
Hold Time
Output Valid
from Clock
Bus Free Time
CB
Note 1:
2:
300
ns
—
100
ns
—
1000
ns
20 + 0.1 CB
300
ns
1 MHz mode(2)
—
300
ns
100 kHz mode
250
—
ns
400 kHz mode
100
—
ns
1 MHz mode(2)
—
—
ns
100 kHz mode
0
—
ns
400 kHz mode
0
0.9
s
1 MHz mode(2)
—
—
ns
100 kHz mode
—
3500
ns
400 kHz mode
—
1000
ns
1 MHz mode(2)
—
—
ns
100 kHz mode
4.7
—
s
400 kHz mode
1.3
—
s
1 MHz mode(2)
IM50
20 + 0.1 CB
Bus Capacitive Loading
—
—
s
—
400
pF
Conditions
CB is specified to be
from 10 to 400 pF
CB is specified to be
from 10 to 400 pF
Time the bus must be
free before a new
transmission can start
BRG is the value of the I2C Baud Rate Generator. Refer to Section 18.2 “Setting Baud Rate When
Operating as a Bus Master” for details.
Maximum Pin Capacitance = 10 pF for all I2C pins (for 1 MHz mode only).
 2015 Microchip Technology Inc.
DS30010089C-page 515
PIC24FJ256GA412/GB412 FAMILY
FIGURE 36-11:
I2Cx BUS START/STOP BITS TIMING CHARACTERISTICS (SLAVE MODE)
SCLx
IS34
IS31
IS30
IS33
SDAx
Stop
Condition
Start
Condition
TABLE 36-32: I2Cx BUS START/STOP BITS TIMING REQUIREMENTS (SLAVE MODE)
Standard Operating Conditions: 2.0V to 3.6V
(unless otherwise stated)
Operating temperature -40°C  TA  +85°C for Industrial
AC CHARACTERISTICS
Param
No.
IS30
IS31
IS33
IS34
Note 1:
Symbol
TSU:STA
THD:STA
TSU:STO
THD:STO
Characteristic
Start Condition
Setup Time
Start Condition
Hold Time
Stop Condition
Setup Time
Stop Condition
Hold Time
100 kHz mode
Min
Max
Units
Conditions
4.7
—
s
Only relevant for Repeated
Start condition
400 kHz mode
0.6
—
s
1 MHz mode(1)
0.25
—
s
100 kHz mode
4.0
—
s
400 kHz mode
0.6
—
s
1 MHz mode(1)
0.25
—
s
100 kHz mode
4.7
—
s
400 kHz mode
0.6
—
s
1 MHz mode(1)
0.6
—
s
100 kHz mode
4000
—
ns
400 kHz mode
600
—
ns
1 MHz mode(1)
250
—
ns
After this period, the first
clock pulse is generated
Maximum Pin Capacitance = 10 pF for all I2C pins (for 1 MHz mode only).
DS30010089C-page 516
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
FIGURE 36-12:
I2Cx BUS DATA TIMING CHARACTERISTICS (SLAVE MODE)
IS11
IS21
IS10
SCLx
IS25
IS20
IS26
SDAx
In
IS45
IS40
SDAx
Out
TABLE 36-33: I2Cx BUS DATA TIMING REQUIREMENTS (SLAVE MODE)
Standard Operating Conditions: 2.0V to 3.6V
(unless otherwise stated)
Operating temperature -40°C  TA  +85°C for Industrial
AC CHARACTERISTICS
Param
No.
IS10
IS11
IS20
IS21
IS25
Symbol
TLO:SCL
THI:SCL
TF:SCL
TR:SCL
TSU:DAT
Characteristic
Clock Low Time
Clock High Time
SDAx and SCLx
Fall Time
SDAx and SCLx
Rise Time
Data Input
Setup Time
Min
Max
Units
100 kHz mode
4.7
—
s
Device must operate at a
minimum of 1.5 MHz
400 kHz mode
1.3
—
s
Device must operate at a
minimum of 10 MHz
1 MHz mode(1)
0.5
—
s
100 kHz mode
4.0
—
s
Device must operate at a
minimum of 1.5 MHz
400 kHz mode
0.6
—
s
Device must operate at a
minimum of 10 MHz
1 MHz mode(1)
0.5
—
s
100 kHz mode
—
300
ns
400 kHz mode
20 + 0.1 CB
300
ns
1 MHz mode(1)
—
100
ns
100 kHz mode
—
1000
ns
400 kHz mode
20 + 0.1 CB
300
ns
1 MHz mode(1)
—
300
ns
100 kHz mode
250
—
ns
400 kHz mode
100
—
ns
mode(1)
1 MHz
IS26
IS40
THD:DAT
TAA:SCL
100
—
ns
100 kHz mode
0
—
ns
400 kHz mode
0
0.9
s
1 MHz mode(1)
0
0.3
s
Output Valid From 100 kHz mode
Clock
400 kHz mode
0
3500
ns
0
1000
ns
Data Input
Hold Time
1 MHz
IS45
IS50
Note 1:
TBF:SDA
CB
Bus Free Time
mode(1)
0
350
ns
100 kHz mode
4.7
—
s
400 kHz mode
1.3
—
s
1 MHz mode(1)
0.5
—
s
—
400
pF
Bus Capacitive Loading
Conditions
CB is specified to be from
10 to 400 pF
CB is specified to be from
10 to 400 pF
Time the bus must be free
before a new transmission
can start
Maximum Pin Capacitance = 10 pF for all I2C pins (for 1 MHz mode only).
 2015 Microchip Technology Inc.
DS30010089C-page 517
PIC24FJ256GA412/GB412 FAMILY
FIGURE 36-13:
SPIx MODULE MASTER MODE TIMING CHARACTERISTICS (CKE = 0)
SCKx
(CKP = 0)
SP11
SP10
SP21
SP20
SP20
SP21
SCKx
(CKP = 1)
SP35
MSb
SDOx
Bit 14 - - - - - -1
SP31
SDIx
LSb
SP30
MSb In
Bit 14 - - - -1
LSb In
SP40 SP41
TABLE 36-34: SPIx MASTER MODE TIMING REQUIREMENTS (CKE = 0)
Standard Operating Conditions: 2.0V to 3.6V
(unless otherwise stated)
Operating temperature -40°C  TA  +85°C for Industrial
AC CHARACTERISTICS
Param
No.
Symbol
Characteristic
Min
Typ(1)
Max
Units
—
—
ns
TscL
SCKx Output Low Time(2)
TCY/2
SP11
TscH
(2)
SCKx Output High Time
TCY/2
—
—
ns
SP20
TscF
SCKx Output Fall Time(3)
—
10
25
ns
SP21
TscR
SCKx Output Rise Time(3)
—
10
25
ns
SP30
TdoF
SDOx Data Output Fall Time(3)
—
10
25
ns
SP10
Time(3)
SP31
TdoR
SDOx Data Output Rise
—
10
25
ns
SP35
TscH2doV,
TscL2doV
SDOx Data Output Valid After
SCKx Edge
—
—
30
ns
SP40
TdiV2scH,
TdiV2scL
Setup Time of SDIx Data Input
to SCKx Edge
20
—
—
ns
SP41
TscH2diL,
TscL2diL
Hold Time of SDIx Data Input
to SCKx Edge
20
—
—
ns
Conditions
Note 1: Data in “Typ” column is at 3.3V, +25°C unless otherwise stated. Parameters are for design guidance only
and are not tested.
2: The minimum clock period for SCKx is 100 ns; therefore, the clock generated in Master mode must not
violate this specification.
3: Assumes 50 pF load on all SPIx pins.
DS30010089C-page 518
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
FIGURE 36-14:
SPIx MODULE MASTER MODE TIMING CHARACTERISTICS (CKE = 1)
SP36
SCKx
(CKP = 0)
SP11
SCKx
(CKP = 1)
SP10
SP21
SP20
SP20
SP21
SP35
MSb
SDOx
Bit 14 - - - - - -1
SP40
SDIx
LSb
SP30, SP31
MSb In
Bit 14 - - - -1
LSb In
SP41
TABLE 36-35: SPIx MODULE MASTER MODE TIMING REQUIREMENTS (CKE = 1)
Standard Operating Conditions: 2.0V to 3.6V
(unless otherwise stated)
Operating temperature -40°C  TA  +85°C for Industrial
AC CHARACTERISTICS
Param
No.
Symbol
Characteristic
Min
Typ(1)
Max
Units
SP10
TscL
SCKx Output Low Time(2)
TCY/2
—
—
ns
SP11
TscH
SCKx Output High Time(2)
TCY/2
—
—
ns
—
10
25
ns
—
10
25
ns
—
10
25
ns
—
10
25
ns
(3)
SP20
TscF
SCKx Output Fall Time
SP21
TscR
SCKx Output Rise Time(3)
Time(3)
SP30
TdoF
SDOx Data Output Fall
SP31
TdoR
SDOx Data Output Rise Time(3)
SP35
TscH2doV, SDOx Data Output Valid After
TscL2doV SCKx Edge
—
—
30
ns
SP36
TdoV2sc, SDOx Data Output Setup to
TdoV2scL First SCKx Edge
30
—
—
ns
SP40
TdiV2scH, Setup Time of SDIx Data Input
TdiV2scL to SCKx Edge
20
—
—
ns
SP41
TscH2diL,
TscL2diL
20
—
—
ns
Hold Time of SDIx Data Input
to SCKx Edge
Conditions
Note 1: Data in “Typ” column is at 3.3V, +25°C unless otherwise stated. Parameters are for design guidance only
and are not tested.
2: The minimum clock period for SCKx is 100 ns. Therefore, the clock generated in Master mode must not
violate this specification.
3: Assumes 50 pF load on all SPIx pins.
 2015 Microchip Technology Inc.
DS30010089C-page 519
PIC24FJ256GA412/GB412 FAMILY
FIGURE 36-15:
SPIx MODULE SLAVE MODE TIMING CHARACTERISTICS (CKE = 0)
SSx
SP52
SP50
SCKx
(CKP = 0)
SP71
SP70
SP73
SP72
SP72
SP73
SCKx
(CKP = 1)
SP35
SDOx
MSb
Bit 14 - - - - - -1
LSb
SP51
SP30, SP31
SDIx
MSb In
Bit 14 - - - -1
LSb In
SP41
SP40
TABLE 36-36: SPIx MODULE SLAVE MODE TIMING REQUIREMENTS (CKE = 0)
Standard Operating Conditions: 2.0V to 3.6V
(unless otherwise stated)
Operating temperature -40°C  TA  +85°C for Industrial
AC CHARACTERISTICS
Param
No.
Symbol
Characteristic
Min
Typ(1)
Max
Units
SP70
TscL
SCKx Input Low Time
30
—
—
ns
SP71
TscH
SCKx Input High Time
30
—
—
ns
SP72
TscF
SCKx Input Fall Time(2)
—
10
25
ns
SP73
TscR
SCKx Input Rise Time(2)
—
10
25
ns
—
10
25
ns
—
10
25
ns
(2)
SP30
TdoF
SDOx Data Output Fall Time
SP31
TdoR
SDOx Data Output Rise Time(2)
SP35
TscH2doV, SDOx Data Output Valid After
TscL2doV SCKx Edge
—
—
30
ns
SP40
TdiV2scH, Setup Time of SDIx Data Input
TdiV2scL to SCKx Edge
20
—
—
ns
SP41
TscH2diL,
TscL2diL
Hold Time of SDIx Data Input
to SCKx Edge
20
—
—
ns
SP50
TssL2scH, SSx to SCKx  or SCKx Input
TssL2scL
120
—
—
ns
SP51
TssH2doZ
SSx  to SDOx Output
High-Impedance
10
—
50
ns
SP52
TscH2ssH
TscL2ssH
SSx After SCKx Edge
1.5 TCY + 40
—
—
ns
Conditions
Note 1: Data in “Typ” column is at 3.3V, +25°C unless otherwise stated. Parameters are for design guidance only
and are not tested.
2: Assumes 50 pF load on all SPIx pins.
DS30010089C-page 520
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
FIGURE 36-16:
SPIx MODULE SLAVE MODE TIMING CHARACTERISTICS (CKE = 1)
SP60
SSx
SP52
SP50
SCKx
(CKP = 0)
SP71
SP70
SCKx
(CKP = 1)
SP73
SP72
SP72
SP73
SP35
SP52
Bit 14 - - - - - -1
MSb
SDOx
LSb
SP51
SP30, SP31
SDIx
MSb In
Bit 14 - - - -1
LSb In
SP41
SP40
TABLE 36-37: SPIx MODULE SLAVE MODE TIMING REQUIREMENTS (CKE = 1)
Standard Operating Conditions: 2.0V to 3.6V
(unless otherwise stated)
Operating temperature -40°C  TA  +85°C for Industrial
AC CHARACTERISTICS
Param
No.
Symbol
Characteristic
Min
Typ(1)
Max
Units
SP70
TscL
SCKx Input Low Time
30
—
—
ns
SP71
SP72
TscH
TscF
SCKx Input High Time
SCKx Input Fall Time(2)
30
—
—
10
—
25
ns
ns
SP73
SP30
TscR
TdoF
SCKx Input Rise Time(2)
SDOx Data Output Fall Time(2)
—
—
10
10
25
25
ns
ns
SP31
SP35
TdoR
TscH2doV,
TscL2doV
TdiV2scH,
TdiV2scL
TscH2diL,
TscL2diL
SDOx Data Output Rise Time(2)
SDOx Data Output Valid After SCKx Edge
—
—
10
—
25
30
ns
ns
Setup Time of SDIx Data Input to
SCKx Edge
Hold Time of SDIx Data Input to
SCKx Edge
20
—
—
ns
20
—
—
ns
SP40
SP41
SP50
TssL2scH, SSx  to SCKx  or SCKx  Input
TssL2scL
120
—
—
ns
SP51
TssH2doZ SSx  to SDOx Output High-Impedance(3)
10
—
50
ns
SP52
TscH2ssH
TscL2ssH
1.5 TCY + 40
—
—
ns
SSx  After SCKx Edge
Conditions
SP60 TssL2doV SDOx Data Output Valid After SSx Edge
—
—
50
ns
Note 1: Data in “Typ” column is at 3.3V, +25°C unless otherwise stated. Parameters are for design guidance only and
are not tested.
2: The minimum clock period for SCKx is 100 ns. Therefore, the clock generated in Master mode must not
violate this specification.
3: Assumes 50 pF load on all SPIx pins.
 2015 Microchip Technology Inc.
DS30010089C-page 521
PIC24FJ256GA412/GB412 FAMILY
FIGURE 36-17:
UARTx BAUD RATE GENERATOR OUTPUT TIMING
BRGx + 1 * TCY TLW
THW
UxBCLK
TBLD
TBHD
UxTX
FIGURE 36-18:
UARTx START BIT EDGE DETECTION
BRGx
Any Value
Start bit Detected, BRGx Started
TCY
Cycle
Clock
TSETUP
TSTDELAY
UxRX
TABLE 36-38: UARTx AC SPECIFICATIONS
Symbol
Characteristics
Min
Typ
Max
Units
TLW
UxBCLK High Time
20
TCY/2
—
ns
THW
UxBCLK Low Time
20
(TCY * BRGx) + TCY/2
—
ns
TBLD
UxBCLK Falling Edge Delay from UxTX
-50
—
50
ns
TBHD
UxBCLK Rising Edge Delay from UxTX
TCY/2 – 50
—
TCY/2 + 50
ns
TWAK
Min. Low on UxRX Line to Cause Wake-up
TCTS
Min. Low on UxCTS Line to Start
Transmission
TSETUP
Start bit Falling Edge to System Clock Rising
Edge Setup Time
TSTDELAY Maximum Delay in the Detection of the
Start bit Falling Edge
DS30010089C-page 522
—
1
—
s
TCY
—
—
ns
3
—
—
ns
—
—
TCY + TSETUP
ns
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
TABLE 36-39: A/D MODULE SPECIFICATIONS
Standard Operating Conditions: 2V to 3.6V
(unless otherwise stated)
Operating temperature
-40°C  TA  +85°C for Industrial
AC CHARACTERISTICS
Param
No.
Symbol
Characteristic
Min.
Typ
Max.
Units
Conditions
Device Supply
AD01
AVDD
Module VDD Supply
Greater of:
VDD – 0.3
or 2.2
—
Lesser of:
VDD + 0.3
or 3.6
V
AD02
AVSS
Module VSS Supply
VSS – 0.3
—
VSS + 0.3
V
AD05
VREFH
Reference Voltage High
AVSS + 1.7
AVDD
V
AD06
VREFL
Reference Voltage Low
AD07
VREF
Absolute Reference
Voltage
Reference Inputs
—
AVSS
—
AVDD – 1.7
V
AVSS – 0.3
—
AVDD + 0.3
V
—
VREFH
V
Analog Input
AD10
VINH-VINL Full-Scale Input Span
AD11
VIN
Absolute Input Voltage
AVSS – 0.3
—
AVDD + 0.3
V
AD12
VINL
Absolute VINL Input
Voltage
AVSS – 0.3
—
AVDD/3
V
Leakage Current
—
±1.0
±610
nA
VINL = AVSS = VREFL = 0V,
AVDD = VREFH = 3V,
Source Impedance = 2.5 k
Recommended Impedance
of Analog Voltage Source
—
—
2.5K

10-bit
AD20B Nr
Resolution
—
12
—
bits
AD21B INL
Integral Nonlinearity
—
±1
<±2
LSb
VINL = AVSS = VREFL = 0V,
AVDD = VREFH = 3V
AD22B DNL
Differential Nonlinearity
—
—
<±1
LSb
VINL = AVSS = VREFL = 0V,
AVDD = VREFH = 3V
AD23B GERR
Gain Error
—
±1
±3
LSb
VINL = AVSS = VREFL = 0V,
AVDD = VREFH = 3V
AD24B EOFF
Offset Error
—
±1
±2
LSb
VINL = AVSS = VREFL = 0V,
AVDD = VREFH = 3V
AD25B
Monotonicity(1)
—
—
—
—
AD13
AD17
RIN
VREFL
(Note 2)
Accuracy
Note 1:
2:
Guaranteed
The conversion result never decreases with an increase in the input voltage and has no missing codes.
Measurements are taken with the external VREF+ and VREF- used as the voltage reference.
 2015 Microchip Technology Inc.
DS30010089C-page 523
PIC24FJ256GA412/GB412 FAMILY
TABLE 36-40: A/D CONVERSION TIMING REQUIREMENTS(1)
Standard Operating Conditions: 2V to 3.6V
(unless otherwise stated)
Operating temperature -40°C  TA  +85°C for Industrial
AC CHARACTERISTICS
Param
No.
Symbol
Characteristic
Min.
Typ
Max.
Units
Conditions
Clock Parameters
AD50
TAD
A/D Clock Period
AD51
tRC
A/D Internal RC Oscillator Period
278
—
—
ns
—
250
—
ns
AD55
tCONV
Conversion Time
—
14
—
TAD
AD56
FCNV
Throughput Rate
AD57
tSAMP
Sample Time
—
—
200
ksps
—
1
—
TAD
AD61
tPSS
Sample Start Delay from Setting
Sample bit (SAMP)
—
3
TAD
Conversion Rate
AVDD > 2.7V
Clock Parameters
Note 1:
2
Because the sample caps will eventually lose charge, clock rates below 10 kHz can affect linearity
performance, especially at elevated temperatures.
TABLE 36-41: 10-BIT DAC SPECIFICATIONS
AC CHARACTERISTICS
Param
No.
Sym
Characteristic
Operating Conditions: -40°C < TA < +85°C, 2.0V < (A)VDD < 3.6V(1)
Min
Typ
Max
Units
Conditions
DAC01
Resolution
10
—
—
bits
DAC02
DVREF+ Input Voltage
Range
—
—
AVDD
V
DAC03 DNL
Differential Linearity Error
-1
—
+1
LSb
DAC04 INL
Integral Linearity Error
-3.0
—
+3.0
LSb
DAC05
Offset Error
-20
—
+20
mV
Code 000h
DAC06
Gain Error
-3.0
—
+3.0
LSb
Code 3FFh, not including
offset error
Note 1:
Unless otherwise stated, test conditions are with VDD = AVDD = DVREF+ = 3.3V, 3 kΩ load to VSS.
DS30010089C-page 524
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
37.0
PACKAGING INFORMATION
37.1
Package Marking Information
64-Lead QFN (9x9x0.9 mm)
XXXXXXXXXXX
XXXXXXXXXXX
XXXXXXXXXXX
YYWWNNN
64-Lead TQFP (10x10x1 mm)
XXXXXXXXXX
XXXXXXXXXX
XXXXXXXXXX
YYWWNNN
Legend: XX...X
Y
YY
WW
NNN
Note:
Example
PIC24FJ256
GB406
1550017
Example
PIC24FJ256
GB406
1520017
Customer-specific information
Year code (last digit of calendar year)
Year code (last 2 digits of calendar year)
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code
In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line, thus limiting the number of available
characters for customer-specific information.
 2015 Microchip Technology Inc.
DS30010089C-page 525
PIC24FJ256GA412/GB412 FAMILY
37.2
Package Marking Information (Continued)
100-Lead TQFP (12x12x1 mm)
XXXXXXXXXXXX
XXXXXXXXXXXX
YYWWNNN
121-BGA (10x10x1.1 mm)
XXXXXXXXXXX
XXXXXXXXXXX
XXXXXXXXXXX
YYWWNNN
DS30010089C-page 526
Example
PIC24FJ256
GB410
1520017
Example
PIC24FJ256
GB412
1520017
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
37.3
Package Details
The following sections give the technical details of the packages.
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
 2015 Microchip Technology Inc.
DS30010089C-page 527
PIC24FJ256GA412/GB412 FAMILY
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
DS30010089C-page 528
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
N
 2015 Microchip Technology Inc.
DS30010089C-page 529
PIC24FJ256GA412/GB412 FAMILY
64-Lead Plastic Thin Quad Flatpack (PT)-10x10x1 mm Body, 2.00 mm Footprint [TQFP]
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
D
D1
D1/2
D
NOTE 2
A
B
E1/2
E1
A
E
A
SEE DETAIL 1
N
4X N/4 TIPS
0.20 C A-B D
1 3
2
4X
NOTE 1
0.20 H A-B D
TOP VIEW
A2
A
0.05
C
SEATING
PLANE
0.08 C
64 X b
0.08
e
A1
C A-B D
SIDE VIEW
Microchip Technology Drawing C04-085C Sheet 1 of 2
DS30010089C-page 530
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
64-Lead Plastic Thin Quad Flatpack (PT)-10x10x1 mm Body, 2.00 mm Footprint [TQFP]
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
H
c
E
L
(L1)
T
X=A—B OR D
X
SECTION A-A
e/2
DETAIL 1
Notes:
Units
Dimension Limits
Number of Leads
N
e
Lead Pitch
Overall Height
A
Molded Package Thickness
A2
Standoff
A1
Foot Length
L
Footprint
L1
I
Foot Angle
Overall Width
E
Overall Length
D
Molded Package Width
E1
Molded Package Length
D1
c
Lead Thickness
b
Lead Width
D
Mold Draft Angle Top
E
Mold Draft Angle Bottom
MIN
0.95
0.05
0.45
0°
0.09
0.17
11°
11°
MILLIMETERS
NOM
64
0.50 BSC
1.00
0.60
1.00 REF
3.5°
12.00 BSC
12.00 BSC
10.00 BSC
10.00 BSC
0.22
12°
12°
MAX
1.20
1.05
0.15
0.75
7°
0.20
0.27
13°
13°
1. Pin 1 visual index feature may vary, but must be located within the hatched area.
2. Chamfers at corners are optional; size may vary.
3. Dimensions D1 and E1 do not include mold flash or protrusions. Mold flash or
protrusions shall not exceed 0.25mm per side.
4. Dimensioning and tolerancing per ASME Y14.5M
BSC: Basic Dimension. Theoretically exact value shown without tolerances.
REF: Reference Dimension, usually without tolerance, for information purposes only.
Microchip Technology Drawing C04-085C Sheet 2 of 2
 2015 Microchip Technology Inc.
DS30010089C-page 531
PIC24FJ256GA412/GB412 FAMILY
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
DS30010089C-page 532
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
/HDG3ODVWLF7KLQ4XDG)ODWSDFN37±[[PP%RG\PP>74)3@
1RWH
)RUWKHPRVWFXUUHQWSDFNDJHGUDZLQJVSOHDVHVHHWKH0LFURFKLS3DFNDJLQJ6SHFLILFDWLRQORFDWHGDW
KWWSZZZPLFURFKLSFRPSDFNDJLQJ
D
D1
e
E
E1
N
b
NOTE 1
1 23
NOTE 2
α
c
A
φ
L
β
A1
8QLWV
'LPHQVLRQ/LPLWV
1XPEHURI/HDGV
A2
L1
0,//,0(7(56
0,1
1
120
0$;
/HDG3LWFK
H
2YHUDOO+HLJKW
$
±
%6&
±
0ROGHG3DFNDJH7KLFNQHVV
$
6WDQGRII
$
±
)RRW/HQJWK
/
)RRWSULQW
/
5()
)RRW$QJOH
2YHUDOO:LGWK
(
ƒ
%6&
ƒ
2YHUDOO/HQJWK
'
%6&
0ROGHG3DFNDJH:LGWK
(
%6&
0ROGHG3DFNDJH/HQJWK
'
%6&
ƒ
/HDG7KLFNQHVV
F
±
/HDG:LGWK
E
0ROG'UDIW$QJOH7RS
ƒ
ƒ
ƒ
0ROG'UDIW$QJOH%RWWRP
ƒ
ƒ
ƒ
1RWHV
3LQYLVXDOLQGH[IHDWXUHPD\YDU\EXWPXVWEHORFDWHGZLWKLQWKHKDWFKHGDUHD
&KDPIHUVDWFRUQHUVDUHRSWLRQDOVL]HPD\YDU\
'LPHQVLRQV'DQG(GRQRWLQFOXGHPROGIODVKRUSURWUXVLRQV0ROGIODVKRUSURWUXVLRQVVKDOOQRWH[FHHGPPSHUVLGH
'LPHQVLRQLQJDQGWROHUDQFLQJSHU$60(<0
%6& %DVLF'LPHQVLRQ7KHRUHWLFDOO\H[DFWYDOXHVKRZQZLWKRXWWROHUDQFHV
5() 5HIHUHQFH'LPHQVLRQXVXDOO\ZLWKRXWWROHUDQFHIRULQIRUPDWLRQSXUSRVHVRQO\
0LFURFKLS 7HFKQRORJ\ 'UDZLQJ &%
 2015 Microchip Technology Inc.
DS30010089C-page 533
PIC24FJ256GA412/GB412 FAMILY
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
DS30010089C-page 534
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
121-Ball Plastic Thin Profile Fine Pitch Ball Grid Array (BG) 10x10x1.10 mm Body [TFBGA]
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
D
A
B
NOTE 1
E
(DATUM B)
(DATUM A)
2X
0.10 C
2X
0.10 C
TOP VIEW
A
DETAIL A
A1
SIDE VIEW
D1
e
DETAIL B
L
K
J
H
G
F
E
D
C
B
A
E1
e
BOTTOM VIEW
Microchip Technology Drawing C04-148 Rev F Sheet 1 of 2
 2015 Microchip Technology Inc.
DS30010089C-page 535
PIC24FJ256GA412/GB412 FAMILY
121-Ball Plastic Thin Profile Fine Pitch Ball Grid Array (BG) 10x10x1.10 mm Body [TFBGA]
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
C
0.10 C
DETAIL A
NX Øb
0.15
0.08
C A B
C
DETAIL B
Number of Contacts
Contact Pitch
Overall Height
Ball Height
Overall Width
Array Width
Overall Length
Array Length
Contact Diameter
Units
Dimension Limits
N
e
A
A1
E
E1
D
D1
b
MIN
1.00
0.25
0.35
MILLIMETERS
NOM
121
0.80 BSC
1.10
0.30
10.00 BSC
8.00 BSC
10.00 BSC
8.00 BSC
0.40
MAX
1.20
0.35
0.45
Notes:
1. Ball A1 visual index feature may vary, but must be located within the hatched area.
2. Dimensioning and tolerancing per ASME Y14.5M.
BSC: Basic Dimension. Theoretically exact value shown without tolerances.
REF: Reference Dimension, usually without tolerance, for information purposes only.
3. The outer rows and colums of balls are located with respect to datums A and B.
4. Ball interface to package body: 0.37mm nominal diameter.
Microchip Technology Drawing C04-148 Rev F Sheet 2 of 2
DS30010089C-page 536
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
 2015 Microchip Technology Inc.
DS30010089C-page 537
PIC24FJ256GA412/GB412 FAMILY
NOTES:
DS30010089C-page 538
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
APPENDIX A:
REVISION HISTORY
Revision A (February 2015)
Original data sheet for the PIC24FJ256GA412/GB412
family of devices.
Revision B (July 2015)
This revision incorporates the following updates:
• Sections:
- Updates the Special Microcontroller Features
and Peripheral Features sections at the
beginning of the data sheet (Page 1 and
Page 2).
- Adds Section 4.2 “Unique Device Identifier
(UDID)” and Section 4.2 “Unique Device
Identifier (UDID)”.
- Updates Section 22.0 “Liquid Crystal
Display (LCD) Controller”.
• Registers:
- Updates Register 33-1 and Register 33-10.
• Tables:
- Updates the 16/32-Bit Timers column in the
Device Features table on Page 2.
- Updates Table 1-5, Table 4-5, Table 4-6,
Table 4-7, Table 4-8, Table 4-9, Table 4-10,
Table 4-11, Table 4-12, Table 23-1,
Table 36-4, Table 36-5 and Table 36-5.
- Adds Table 36-41.
• Removes all references to ISO 7816 Support and
Deep Sleep mode.
• Changes to text and formatting were incorporated
throughout the document.
Revision C (September 2015)
This revision incorporates the following updates:
• Sections:
- Updates Section 2.6 “External Oscillator
Pins”.
- Removes Section 4.2 “Unique Device
Identifier (UDID)” and updates what was
Section 4.3 and is now Section 4.2 “Unique
Device Identifier (UDID)”.
• Tables:
- Removes Table 4-3 and updates what was
Table 4-4 and is now Table 4-3.
- Replaces all Reset values in Table 4-5
through Table 4-12.
- Registers:
- Updates Register 24-3, Register 24-7,
Register 24-8, Register 24-9 and
Register 24-10.
Index and Table of Contents were updated accordingly.
 2015 Microchip Technology Inc.
DS30010089C-page 539
PIC24FJ256GA412/GB412 FAMILY
NOTES:
DS30010089C-page 540
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
INDEX
A
A/D
Extended DMA Operations ....................................... 425
Operation .................................................................. 423
Registers................................................................... 427
Transfer Functions
10-Bit ................................................................ 440
12-Bit ................................................................ 439
AC Characteristics
10-Bit DAC Specifications......................................... 524
A/D Conversion Timing ............................................. 524
A/D Module ............................................................... 523
CLKO and I/O Timing Requirements ........................ 509
External Clock Timing ............................................... 507
I2Cx Bus Data (Master Mode) .................................. 515
I2Cx Bus Data (Slave Mode) .................................... 517
I2Cx Bus Start/Stop Bits (Master Mode) ................... 514
I2Cx Bus Start/Stop Bits (Slave Mode) ..................... 516
Internal RC Accuracy ................................................ 508
Load Conditions and Requirements for
Specifications.................................................... 506
PLL Clock Timing...................................................... 508
RC Oscillator Start-up Time ...................................... 508
Reset and Brown-out Reset Requirements .............. 510
SPIx Master Mode (CKE = 0) ................................... 518
SPIx Master Mode (CKE = 1) ................................... 519
SPIx Slave Mode (CKE = 0) ..................................... 520
SPIx Slave Mode (CKE = 1) ..................................... 521
UARTx Specifications ............................................... 522
Alternate Interrupt Vector Table (AIVT) ............................ 107
Assembler
MPASM Assembler................................................... 484
B
Block Diagrams
10-Bit A/D Converter Analog Input Model................. 438
12-Bit A/D Converter................................................. 424
16-Bit Asynchronous Timer3 and Timer5 ................. 249
16-Bit Synchronous Timer2 and Timer4 ................... 249
16-Bit Timer1 Module................................................ 243
32-Bit Timer Mode .................................................... 255
Accessing Program Memory Using
Table Instructions ............................................... 85
Addressing for Table Registers................................... 97
BDT Mapping for Endpoint Buffering Modes ............ 328
Buffer Address Generation in PIA Mode................... 426
CALL Stack Frame ..................................................... 82
CLCx Input Source Selection.................................... 379
CLCx Logic Function Combinatorial Options ............ 378
CLCx Module ............................................................ 377
Comparator Voltage Reference Module ................... 451
Conceptual MCCPx/SCCPx Modules ....................... 253
CPU Programmer’s Model .......................................... 59
CRC Module ............................................................. 417
CRC Shift Engine Detail............................................ 417
Cryptographic Engine ............................................... 399
CTMU Connections and Internal Configuration
Capacitance Measurement ............................... 454
Pulse Delay Generation .................................... 455
Time Measurement ........................................... 454
 2015 Microchip Technology Inc.
Data Access from Program Space
Address Generation............................................ 84
Direct Memory Access (DMA) Functional................... 89
Dual 16-Bit Timer Mode............................................ 255
EDS Address Generation for Read Operations.......... 80
EDS Address Generation for Write Operations .......... 81
High/Low-Voltage Detect (HLVD)............................. 461
High-Level RTCC ..................................................... 387
I2Cx Module ............................................................. 302
Individual Comparator Configurations,
CREF = 0.......................................................... 446
Individual Comparator Configurations,
CREF = 1 and CVREFP = 0 ............................. 447
Individual Comparator Configurations,
CREF = 1 and CVREFP = 1 ............................. 447
Input Capture x Module .................................... 257, 269
LCD Controller.......................................................... 369
MCLR Pin Connections Example ............................... 52
On-Chip Regulator Connections............................... 479
Output Compare x (16-Bit Mode) ............................. 276
Output Compare x (Double-Buffered,
16-Bit PWM Mode) ........................................... 278
Output Compare x Module ....................................... 256
PIC24F CPU Core ...................................................... 58
PIC24F256GA412 Family (General) .......................... 25
PIC24FJ256GB412 Family (General)......................... 26
PLL System .............................................................. 185
PSV Operation (Lower Word)..................................... 87
PSV Operation (Upper Word)..................................... 87
Recommended Minimum Connections....................... 51
Reference Clock (Simplified) .................................... 187
Reset System ........................................................... 101
Shared I/O Port Structure ......................................... 209
Simplified Single DAC .............................................. 441
SPIx Master, Frame Master Connection .................. 299
SPIx Master, Frame Slave Connection .................... 300
SPIx Master/Slave Connection
(Enhanced Buffer Modes)................................. 299
SPIx Master/Slave Connection
(Standard Mode)............................................... 298
SPIx Module (Enhanced Mode)................................ 287
SPIx Module (Standard Mode) ................................. 286
SPIx Slave, Frame Master Connection .................... 300
SPIx Slave, Frame Slave Connection ...................... 300
System Clock............................................................ 177
Timer Clock Generator ............................................. 254
Timer2/3 and Timer4/5 (32-Bit) ................................ 248
Triple Comparator Module........................................ 445
UARTx (Simplified) ................................................... 310
USB OTG Bus Power Only Interface Mode.............. 325
USB OTG Dual Power Mode.................................... 325
USB OTG Host Interface Example ........................... 326
USB OTG Interface Example ................................... 326
USB OTG Interrupt Funnel ....................................... 332
USB OTG Module..................................................... 324
USB OTG Self-Power Only Mode ............................ 325
Watchdog Timer (WDT)............................................ 480
DS30010089C-page 541
PIC24FJ256GA412/GB412 FAMILY
C
C Compilers
MPLAB C18 .............................................................. 484
Capture/Compare/PWM/Timer
Auxiliary Output......................................................... 258
General Purpose Timer............................................. 254
Input Capture Mode .................................................. 257
Output Compare Mode ............................................. 256
Synchronization Sources .......................................... 262
Time Base Generator................................................ 254
Capture/Compare/PWM/Timer (MCCP, SCCP)................ 253
Charge Time Measurement Unit. See CTMU.
CLC
Control Registers ...................................................... 380
Code Examples
Basic Clock Switching ............................................... 184
Configuring UART1 Input/Output Functions ............. 223
EDS Read from Program Memory in
Assembly Code................................................... 86
EDS Read in Assembly Code ..................................... 80
EDS Write in Assembly Code ..................................... 81
IOC Status Read/Clear in Assembly ......................... 216
Port Read/Write in Assembly .................................... 216
Port Read/Write in C ................................................. 216
PWRSAV Instruction Syntax ...................................... 192
Setting the WRLOCK Bit ........................................... 391
The Repeat Sequence .............................................. 195
Code Protection ................................................................ 481
CodeGuard™ Security ...................................................... 481
Comparator Voltage Reference ........................................ 451
Configuring................................................................ 451
Configurable Logic Cell (CLC) .......................................... 377
Configurable Logic Cell. See CLC.
Configuration Bits.............................................................. 463
Core Features ..................................................................... 19
Dual Partition Flash Memory....................................... 19
CPU
Arithmetic Logic Unit (ALU)......................................... 62
Clocking Scheme ...................................................... 178
Control Registers ........................................................ 60
Core Registers ............................................................ 58
Programmer’s Model................................................... 57
CRC
Polynomials............................................................... 418
Setup Examples for 16 and 32-Bit Polynomials ........ 418
User Interface ........................................................... 418
Cryptographic Engine.................................................. 20, 399
Data Register Spaces ............................................... 400
Decrypting Data ........................................................ 401
Enabling .................................................................... 400
Encrypting Data ........................................................ 401
Key RAM ................................................................... 405
Operation Modes ...................................................... 400
Sleep and Idle modes ....................................... 405
Programming
CFGPAGE Configuration Bits ........................... 404
Key Erasure ...................................................... 405
Keys .................................................................. 404
Verifying Keys ................................................... 405
Pseudorandom Number (PRN) Generation .............. 403
Session Keys
Encrypting ......................................................... 402
Receiving .......................................................... 402
Testing Key Source Configuration ............................ 403
True Random Number (TRN) Generation................. 403
DS30010089C-page 542
CTMU
Measuring Capacitance ............................................ 453
Measuring Time ........................................................ 454
Pulse Generation and Delay..................................... 455
Customer Change Notification Service............................. 548
Customer Notification Service .......................................... 548
Customer Support............................................................. 548
Cyclic Redundancy Check. See CRC.
D
DAC
Data Memory
Address Space ........................................................... 69
Extended Data Space (EDS) ...................................... 79
Memory Map............................................................... 69
Near Data Space ........................................................ 70
SFR Space ................................................................. 70
Software Stack ........................................................... 82
Space Organization, Alignment .................................. 70
DC Characteristics
Comparator............................................................... 505
Comparator Voltage Reference ................................ 505
CTMU Current Source .............................................. 503
Delta Current (BOR, WDT, DSBOR,
DSWDT, LCD) .................................................. 500
I/O Pin Input Specifications....................................... 501
I/O Pin Output Specifications.................................... 502
Idle Current (IIDLE) .................................................... 498
Operating Current (IDD) ............................................ 498
Power-Down Current (IPD)........................................ 499
Program Memory ...................................................... 502
Temperature and Voltage Specifications.................. 497
USB OTG Specifications .......................................... 504
Development Support ....................................................... 483
Device Features
100-Pin ....................................................................... 23
121-Pin ....................................................................... 24
64-Pin ......................................................................... 22
Digital-to-Analog Converter. See DAC.
Direct Memory Access (DMA) Controller ............................ 20
Direct Memory Access Controller. See DMA.
DMA
Channel Trigger Sources............................................ 96
Control Registers ........................................................ 92
Peripheral Module Disable (PMD) .............................. 92
Summary of Operations.............................................. 90
Types of Data Transfers ............................................. 91
Typical Setup .............................................................. 92
E
Electrical Characteristics
Absolute Maximum Ratings ...................................... 495
Capacitive Loading on Output Pins .......................... 506
High/Low-Voltage Detect .......................................... 504
Internal Voltage Regulator ........................................ 503
Thermal Operating Conditions.................................. 496
Thermal Packaging Characteristics .......................... 496
V/F Graph ................................................................. 496
VBAT Operating Voltage............................................ 503
Enhanced Parallel Master Port (EPMP)
Feature Differences by Pin Count............................. 357
Key Features ............................................................ 357
Package Variations................................................... 357
Pin Descriptions........................................................ 358
Enhanced Parallel Master Port. See EPMP.
 2015 Microchip Technology Inc.
PIC24FJ256GA412/GB412 FAMILY
Equations
16-Bit, 32-Bit CRC Polynomials ................................ 418
A/D Conversion Clock Period ................................... 438
Calculating the PWM Period ..................................... 278
Calculation for Maximum PWM Resolution............... 279
Estimating USB Transceiver
Current Consumption........................................ 327
I2C Baud Rate Reload Calculation............................ 303
Relationship Between Device and SPIx
Clock Speed ..................................................... 300
RTCC Clock Divider Output Frequency .................... 388
UARTx Baud Rate with BRGH = 0 ........................... 311
UARTx Baud Rate with BRGH = 1 ........................... 311
Errata .................................................................................. 18
Extended Data Space (EDS) ...................................... 79, 357
Reading from Program Memory.................................. 86
Reads from ................................................................. 80
Writes to...................................................................... 81
F
Flash Configuration Words ................................................. 67
Flash Program Memory ...................................................... 97
and Table Instructions................................................. 97
Control Register .......................................................... 98
Enhanced ICSP Operation.......................................... 98
JTAG Operation .......................................................... 98
Operations ................................................................ 100
Programming Algorithm ............................................ 100
RTSP Operation.......................................................... 98
G
Getting Started
Basic Connection Requirements................................. 51
External Oscillator Pins............................................... 55
ICSP Operation
Analog and Digital Pin Configuration .................. 56
Pins ..................................................................... 54
Master Clear Reset (MCLR) Pin ................................. 52
Power Supply Pins...................................................... 52
Voltage Regulator (VCAP) ........................................... 53
H
High/Low-Voltage Detect (HLVD) ..................................... 461
High/Low-Voltage Detect. See HLVD.
I
I/O Ports
Analog Port Pins Configuration