View detail for AT80C5112/AT83C5112/AT87C5112

Features
• 80C51 Compatible
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
– Five I/O Ports
– Two 16-bit Timer/Counters
– 256 Bytes RAM
8K Bytes ROM/OTP Program Memory with 64 Bytes Encryption Array and 3 Security
Levels
High-Speed Architecture
– 33 MHz at 5V (66 MHz Equivalent)
– X2 Speed Improvement Capability (6 Clocks/Machine Cycle)
10-bit, 8 Channels A/D Converter
Hardware Watchdog Timer with Reset-out
Programmable I/O Mode: Standard C51, Input Only, Push-pull, Open Drain
Asynchronous Port Reset
Full Duplex Enhanced UART with Baud Rate Generator
SPI, Master Mode
Dual System Clock
– Crystal or Ceramic Oscillator (33/40 MHz)
– Internal RC Oscillator (12 MHz)
– Programmable Prescaler
Programmable Counter Array with High-speed Output, Compare/Capture, Pulse Width
Modulation and Watchdog Timer Capabilities
Interrupt Structure
– 8 Interrupt Sources
– 4 Interrupt Priority Levels
Power Control Modes
– Idle Mode
– Power-down Mode
– Power-off Flag
Power Supply: 2.7 - 5.5V
Temperature Range: Industrial (-40 To 85°C)
Package: LQFP48 (Body 7*7*1.4 mm), PLCC52
8-bit
Microcontroller
with A/D
Converter
AT80C5112
AT83C5112
AT87C5112
Description
The AT8xC5112 is a high performance ROM/OTP version of the 80C51 8-bit
microcontroller.
The AT8xC5112 retains all the features of the standard 80C51 with 8 Kbytes
ROM/OTP program memory, 256 bytes of internal RAM, a 8-source, 4-level interrupt
system, an on-chip oscillator and two timer/counters.
The AT8xC5112 is dedicated for analog interfacing applications. For this, it has a 10bit, 8 channels A/D converter and a five channels Programmable Counter Array.
In addition, the AT8xC5112 has a Hardware Watchdog Timer, a versatile serial channel that facilitates multiprocessor communication (EUART) with an independent baud
rate generator, a SPI serial bus controller and a X2 speed improvement mechanism.
The X2 feature allows to keep the same CPU power at a divided by two oscillator
frequency.
The fully static design of the AT8xC5112 allows to reduce system power consumption
by bringing the clock frequency down to any value, even DC, without loss of data.
Rev. 4191C–8051–02/08
The AT8xC5112 has 3 software-selectable modes of reduced activity for further reduction in power consumption. In the idle mode, the CPU is frozen while the peripherals are
still operating. In the quiet mode, the A/D converter is only operating. In the Power-down
mode, the RAM is saved and all other functions are inoperative. Two oscillators source,
crystal and RC, provide a versatile power management.
The AT8xC5112 is proposed in 48-/52-pin count packages with Port 0 and Port 2
(address/
data buses).
(1) (1)
(2) (2)
Xtal
Osc
C51
CORE
SS
SPSCK
MISO
MOSI
PCA
SPI
8 K *8
Watch
Dog
IB-bus
CPU
RST
EA
Timer 0
Timer 1
ALE
PSEN
INT
Ctrl
Parallel I/O Ports
A/D
Converter
Port 1 Port 3 Port 4 Port 0 Port 2
P2
P0
P4
P3
P1
(3)
AIN0-7
(2) (3)
Vref
(2) (3)
INT1
VPP
(2)
2
ROM /OTP
RAM
256
x8
INT0
RC
Osc
EUART
BRG
T1
(2)
XTAL2
Notes:
(3)(3) (3) (3)
(2)
T0
XTAL1
CEX0-4
ECI
Vss
Vcc
TxD
RxD
Block Diagram
1. Alternate function of Port 1.
2. Alternate function of Port 3.
3. Alternate function of Port 4.
AT8xC5112
4191C–8051–02/08
AT8xC5112
SFR Mapping
The Special Function Registers (SFRs) of the AT8xC5112 belong to the following
categories:
•
C51 core registers: ACC, B, DPH, DPL, PSW, SP, AUXR1
•
I/O port registers: P1, P3, P4, P1M1, P1M2, P3M1, P3M2, P4M1, P4M2
•
Timer registers: TCON, TH0, TH1, TMOD, TL0, TL1
•
Serial I/O port registers: SADDR, SADEN, SBUF, SCON, BRL, BDRCON
•
Power and clock control registers: CKCON0, CKCON1, OSCCON, CKSEL, PCON,
CKRL
•
Interrupt system registers: IE, IE1, IPL0, IPL1, IPH0, IPH1
•
Watchdog Timer: WDTRST, WDTPRG
•
SPI: SPCON, SPSTA, SPDAT
•
PCA: CCAP0L, CCAP1L, CCAP2L, CCAP3L, CCAP4L, CCAP0H, CCAP1H,
CCAP2H, CCAP3H, CCAP4H, CCAPM0, CCAPM1, CCAPM2, CCAPM3,
CCAPM4, CL, CH, CMOD, CCON
•
ADC: ADCCON, ADCCLK, ADCDATH, ADCDATL, ADCF
3
4191C–8051–02/08
Table 1. SFR Addresses and Reset Values
0/8
F8h
F0h
1/9
72/A
3/B
4/C
5/D
6/E
CH
0000 0000
CCAP0H
XXXX XXXX
CCAP1H
XXXX XXXX
CCAP2H
XXXX XXXX
CCAP3H
XXXX XXXX
CCAP4H
XXXX XXXX
FFh
F7h
B
0000 0000
CL
0000 0000
E8h
E0h
ACC
0000 0000
D8h
CCON
00X0 0000
D0h
PSW
0000 0000
ADCLK
ADCON
0000 0000
0000 0000
ADDL
XXXXXX00
ADDH
0000 0000
ADCF
0000 0000
CCAP0L
XXXX XXXX
CCAP1L
XXXX XXXX
CCAP2L
XXXX XXXX
CCAP3L
XXXX XXXX
CCAP4L
XXXX XXXX
P3M2
0000 0000
P4M2
0000 0000
CCAPM2
X000 0000
CCAPM3
X000 0000
CCAPM4
X000 0000
DFh
P1M1
P3M1
0000 0000
P4M1
0000 0000
D7h
P1M2
0000 0000
CMOD
X000 0000
7/F
CCAPM0
00XX X000
CCAPM1
X000 0000
0000 0000
CONF
E7h
C8h
CFh
C0h
P4
1111 1111
B8h
IPL0
0000 0000
SADEN
0000 0000
B0h
P3
1111 1111
0000 0000
A8h
IE0
0000 0000
SADDR
0000 0000
SPCON
0001 0100
IE1
90h
88h
SPSTA
SPDAT
XXXXXXXX
XXXX XXXX
SCON
0000 0000
SBUF
XXXX XXXX
C7h
BFh
IPL1
0000 0000
IPH1
0000 0000
AUXR1
XXXXXXX0
A0h
98h
EFh
BRL
0000 0000
WDRST
0000 0000
IPH0
X000 0000
B7h
CKCON1
XXXX XXX0
AFh
WDTPRG
0000 0000
A7h
BDRCON
9Fh
0000 0000
P1
CKRL
1111 1111
1111 1111
TCON
0000 0000
80h
0/8
TMOD
0000 0000
TL0
0000 0000
TL1
0000 0000
SP
0000 0111
DPL
0000 0000
DPH
0000 0000
1/9
2/A
3/B
TH0
0000 0000
4/C
TH1
0000 0000
CKCON0
X000X000
PCON
CKSEL
XXXX XXX1
OSCCON
XXXX XX01
00X1 0000
5/D
6/E
7/F
97h
8Fh
87h
Reserved
4
AT8xC5112
4191C–8051–02/08
AT8xC5112
P4.1/AIN1/T1
P4.0/AIN0
P4.3/AIN3/INT1
P4.2/AIN2/SS
P1.1/RD
P1.0/WR
EA
RST
P4.4/AIN4/MISO
P4.5/AIN5/MOSI
P4.6/AIN6/SPSCK
P4.7/AIN7
Pin Configurations
48 47 46 45 44 43 42 41 40 39 38 37
VREF
VSS + AVSS
1
P2.7
P2.6
3
4
P2.5
5
2
LQFP48
36
35
P3.0/RxD
34
P0.0
33
P0.1
32
31
30
P0.2
P3.1/TxD
P0.3
P0.4
P2.4
6
P2.3
V2.2
7
8
9
29
28
P0.5
VCC + AVCC
P2.1
10
27
P0.7
P2.0
11
26
P1.2/ECI
P3.7
12
25
P1.3/CEX0
7*7*1.4 mm
P0.6
P4.0/AIN0
P4.1/AIN1/T1
P1.4/CEX1
P4.2/AIN2/SS
P3.2/INT0
P1.5/CEX2
P1.1/RD
P4.3/AIN3/INT1
P3.3/T0
P1.0/WR
PSEN
EA
RST
P4.4/AIN4/MISO
P4.5/AIN5/MOSI
XTAL1
P1.7/CEX4
P1.6/CEX3
ALE
XTAL2
P4.6/AIN6/SPSCK
P4.7/AIN7
VREF
VPP
P3.6
13 14 15 16 17 18 19 20 21 22 23 24
7 6 5 4 3 2 1 52 51 50 49 48 47
VSS
AVSS
8
9
46
45
NIC
P2.7
10
44
P3.1/TxD
P2.6
11
43
P0.0
P2.5
42
41
P0.1
P2.3
12
13
14
40
P2.2
AVCC + VCC
15
16
39
38
P0.3
P0.4
P2.1
P2.0
17
37
P0.6
18
36
P0.7
P3.7
19
35
P1.2/ECI
VPP
20
34
P1.3/CEX0
P2.4
PLCC52
P3.0/RxD
P0.2
P0.5
P1.4/CEX1
P3.2/INT0
P1.5/CEX2
P3.3/T0
PSEN
P1.7/CEX4
P1.6/CEX3
ALE
P3.4
XTAL1
XTAL2
P3.6
P3.5
21 22 23 24 25 26 27 28 29 30 31 32 33
*NIC: No Internal Connection
5
4191C–8051–02/08
Table 2. Pin Description
PIN NUMBER
TYPE
LQFP
PLCC
48
52
VSS
X
X
I
Ground: 0V reference.
VCC
X
X
I
Power Supply: This is the power supply voltage for normal, idle and power-down operation.
X
I
Analog Ground: 0V reference.
I
Analog Power Supply: This is the power supply voltage for normal and idle operation of the A/D
VREF : A/D converter positive reference input.
Mnemonic
AVSS
AVCC
Name and Function
VREF
X
X
I
VPP
X
X
I
P1.0 - P1.7
X
X
Vpp : Programming Supply Voltage:
I/O
This pin also receives the 12V programming pulse which will start the EPROM programming and the
manufacturer test modes.
Port 1: Port 1 is an 8-bit bi-directional I/O port with internal pull-ups. Port 1 pins that have 1s written to them are
pulled high by the internal pull-ups and can be used as inputs.
Alternate functions for Port 1 include:
P3.0 - P3.7
X
X
I/O
WR (P1.0): External data memory write strobe
I/O
RD (P1.1): External data memory readstrobe
I/O
ECI (P1.2): External Clock for the PCA
I/O
CEX0 (P1.3): Capture/Compare External I/O for PCA module 0
I/O
CEX1 (P1.4): Capture/Compare External I/O for PCA module 1
I/O
CEX2 (P1.5): Capture/Compare External I/O for PCA module 2
I/O
CEX3 (P1.6): Capture/Compare External I/O for PCA module 3
I/O
CEX4 (P1.7): Capture/Compare External I/O for PCA module 4
I/O
Port 3: Port 3 is an 8-bit bi-directional I/O port with internal pull-ups. Port 3 pins that have 1s written to them are
pulled high by the internal pull-ups and can be used as inputs.
P3.6 is an input only pin.
Port 3 also serves the special features of the 80C51 family, as listed below.
I/O
RXD (P3.0): Serial input port
I/O
TXD (P3.1): Serial output port
I/O
INT0 (P3.2): External interrupt 0
I/O
T0 (P3.3): Timer 0 external input
I/O
I/O
P4.0-P4.7
X
X
I/O
I/O
I/O
6
Port 4: Port 4 is an 8-bit bi-directional I/O port. Each bit can be set as pure CMOS input or as push-pull output.
Port 4 is also the input port of the analog-to-digital converter and used for oscillator and reset.
AIN0 (P4.0): A/D converter input 0
AIN1 (P4.1): A/D converter input 1
T1: Timer 1 external input
AIN2 (P4.2): A/D converter input 2
SS: Slave select input of the SPI controller
AIN3 (P4.3): A/D converter input 3
INT1: External interrupt 1
AT8xC5112
4191C–8051–02/08
AT8xC5112
Table 2. Pin Description (Continued)
PIN NUMBER
LQFP
PLCC
48
52
Mnemonic
TYPE
Name and Function
I/O
I/O
I/O
AIN4 (P4.4): A/D converter input 4
MISO: Master IN, Slave OUT of the SPI controller
AIN5 (P4.5): A/D converter input 5
MOSI: Master OUT, Slave IN of the SPI controller
AIN6 (P4.6): A/D converter input 6
SPSCK: Clock I/O of the SPI controller
I/O
AIN7 (P4.7): A/D converter input 7
P0.0-P0.7
X
X
I/O
Port 0: Port 0 is an open-drain, bi-directional I/O port. Port 0 pins that have 1s written to them float and can be
used as high impedance inputs. Port 0 is also the multiplexed low-order address and data bus during access to
external program and data memory. In this application, it uses strong internal pull-up when emitting 1s.
P2.0-P2.7
X
X
I/O
Port 2: Port 2 is an 8-bit bi-directional I/O port with internal pull-ups. Port 2 pins that have 1s written to them
are pulled high by the internal pull-ups and can be used as inputs. As inputs, Port 2 pins that are externally
pulled low will source current because of the internal pull-ups. Port 2 emits the high-order address byte during
fetches from external program memory and during accesses to external data memory that use 16-bit
addresses (MOVX atDPTR). In this application, it uses strong internal pull-ups emitting 1s. During accesses to
external data memory that use 8-bit addresses (MOVX atRi), port 2 emits the contents of the P2 SFR.
RST
X
X
I
RST: A high on this pin for two machine cycles while the oscillator is running, resets the device. An internal
diffused resistor to VSS permits a power-on reset using only an external capacitor to VCC. If the hardware
watchdog reaches its time-out, the reset pin becomes an output during the time the internal reset is activated.
ALE
X
X
O
Address Latch Enable: Output pulse for latching the low byte of the address during an access to external
memory. In normal operation, ALE is emitted at a constant rate of 1/6 (1/3 in X2 mode) the oscillator frequency,
and can be used for external timing or clocking. Note that one ALE pulse is skipped during each access to
external data memory. ALE can be disabled by setting SFR’s AUXR.0 bit. With this bit set, ALE will be inactive
during internal fetches.
PSEN
X
X
O
Program Store Enable: The read strobe to external program memory. When executing code from the external
program memory, PSEN is activated twice each machine cycle, except that two PSEN activations are skipped
during each access to external data memory. PSEN is not activated during fetches from internal program
memory.
EA
X
X
I
External Access Enable: EA must be externally held low to enable the device to fetch code from external
program memory locations 0000H and 1FFFH . If EA is held high, the device executes from internal program
memory unless the program counter contains an address greater than 1FFFH. EA must be held low for
ROMless devices. If security level 1 is programmed, EA will be internally latched on Reset.
XTAL1
X
I
XTAL1 : Input to the inverting oscillator amplifier and input to the internal clock generator circuits.
XTAL2
X
O
XTAL2 : Output from the inverting oscillator amplifier.
7
4191C–8051–02/08
AT8xC5112
Clock System
The AT8xC5112 oscillator system provides a reliable clocking system with full mastering
of speed versus CPU power trade off. Several clock sources are possible:
•
External clock input
•
High-speed crystal or ceramic oscillator
•
Integrated high-speed RC oscillator
The selected clock source can be divided by 2 - 512 before clocking the CPU and the
peripherals. When X2 function is set, the CPU needs 6 clock periods per cycle.
Clocking is controlled by several SFR registers: OSCON, CKCON0, CKCON1, CKRL.
Blocks Description
Crystal Oscillator: OSCA
The AT8xC5112 includes the following oscillators:
•
Crystal oscillator
•
Integrated high-speed RC oscillator, with typical frequency of 12 MHz
The crystal oscillator uses two external pins, XTAL1 for input and XTAL2 for output.
Both crystal and ceramic resonators can be used. An oscillator source on XTAL1 is
mandatory to start the product.
OSCAEN in OSCCON register is an enable signal for the crystal oscillator or the external oscillator input.
Integrated High-speed RC
Oscillator: OSCB
The high-speed RC oscillator typical frequency is 12 MHz. Note that the on chip oscillator has a ±50% frequency tolerance and may not be suitable for use in some
applications.
OSCBEN in OSCCON register is an enable signal for the high-speed RC oscillator.
Clock Selector
CKS bit in CKS register is used to select from crystal to RC oscillator.
OSCBEN bit in OSCCON register is used to enable the RC oscillator.
OSCAEN bit in OSCCON register is used to enable the crystal oscillator or the external
oscillator input.
Clock Prescaler
Before supplying the CPU and the peripherals, the main clock is divided by a factor of 2
to 512, as defined by the CKRL register. The CPU needs from 12 to 256*12 clock periods per instruction. This allows:
•
to accept any cyclic ratio to be accepted on XTAL1 input.
•
to reduce the CPU power consumption.
The X2 bit allows to bypass the clock prescaler; in this case, the CPU needs only 6 clock
periods per machine cycle. In X2 mode, as this divider is bypassed, the signals on
XTAL1 must have a cyclic ratio between 40 to 60%.
7
4191C–8051–02/08
Functional Block Diagram
Timer 0 Clock
: 128
ResetB
Sub Clock
Reload
WD Clock
Ckrl
Xtal1
Xtal_Osc
OSCA
Xtal2
OSCAEN
OSCBEN
1
0
A/D Clock
Mux
+
Filter
PwdOsc
OscOut
8-bit
Prescaler-Divider
CkAdc
0
1
CkOut
Peripherals Clock
CkIdle
CKS
RC_Osc
OSCB
CPU Clock
X2
Ck
PwdRC
Quiet Pwd Idle
Operating Modes
Functional Modes
Normal Modes
Idle Modes
8
•
CPU and Peripheral clocks depend on the software selection using CKCON0,
CKCON1, CKSEL and CKRL registers.
•
CKS bit selects either Xtal_Osc or RC_Osc.
•
CKRL register determines the frequency of the selected clock, unless X2 bit is set.
In this case the prescaler/divider is not used, so CPU core needs only 6 clock
periods per machine cycle. According to the value of the peripheral X2 individual bit,
each peripheral needs 6 or 12 clock periods per instruction.
•
It is always possible to switch dynamically by software from Xtal_Osc to RC_Osc,
and vice versa by changing CKS bit, a synchronization cell allowing to avoid any
spike during transition.
•
IDLE modes are achieved by using any instruction that writes into PCON.0 sfr
•
IDLE modes A and B depend on previous software sequence, prior to writing into
PCON.0 register:
–
IDLE MODE A: Xtal_Osc is running (OSCAEN = 1) and selected (CKS = 1)
–
IDLE MODE B: RC_Osc is running (OSCBEN = 1) and selected (CKS = 0)
•
The unused oscillator Xtal_Osc or RC_Osc can be stopped by software by clearing
OSCAEN or OSCBEN, respectively.
•
Exit from IDLE mode is achieved by Reset, or by activation of an enabled interrupt.
•
In both cases, PCON.0 is cleared by hardware.
AT8xC5112
4191C–8051–02/08
AT8xC5112
Power-down Modes
•
Exit from IDLE modes will leave the oscillator control bits OSCAEN, OSCBEN and
CKS unchanged.
•
POWER-DOWN modes are achieved by using any instruction that writes into
PCON.1 sfr
•
Exit from POWER-DOWN mode is achieved either by a hardware Reset, or by an
external interruption.
•
By RST signal: The CPU will restart on OSCA.
•
By INT0 or INT1 interruptions, if enabled. The oscillators control bits OSCAEN,
OSCBEN and CKS will not be changed, so the selected oscillator before entering
into Power-down will be activated.
Table 1. Power Modes
Prescaler Divider
•
•
PD
IDLE
CKS
OSCBEN
OSCAEN Selected Mode
Comment
0
0
1
X
1
NORMAL MODE A OSCA: XTAL clock
X
X
1
X
0
INVALID
0
0
0
1
X
NORMAL MODE B OSCB: high-speed RC clock
X
X
0
0
X
INVALID
0
1
1
X
1
IDLE MODE A
The CPU is off, OSCA supplies the
peripherics
0
1
0
1
X
IDLE MODE B
The CPU is off, OSCB supplies the
peripherics
1
X
X
X
X
TOTAL POWERDOWN
The CPU is off, OSCA and OSCB are
stopped
No active clock
An hardware RESET selects the prescaler divider:
–
CKRL = FFh: internal clock = OscOut/2 (Standard C51 feature)
–
X2 = 0,
After Reset, any value between FFh down to 00h can be written by software into
CKRL sfr in order to divide frequency of the selected oscillator:
–
CKRL = 00h: minimum frequency = OscOut/512
–
CKRL = FFh: maximum frequency = OscOut/2
The frequency of the CPU and peripherals clock CkOut is related to the frequency of the
main oscillator OscOut by the following formula:
FCkOut = FOscOut/(512 - 2*CKRL)
Some examples can be found in the table below:
FOscOut
•
MHz
X2
CKRL
FCkOut (Mhz)
12
0
FF
6
12
0
FE
3
12
1
x
12
A software instruction which sets X2 bit de-activates the prescaler/divider, so the
internal clock is either Xtal_Osc or RC_Osc depending on SEL_OSC bit.
9
4191C–8051–02/08
Timer 0: Clock Inputs
CkIdle
:6
T0 pin
0
Timer 0
1
0
Control
1
Sub Clock
C/T
TMOD
SCLKT0
OSCCON
Gate
INT0
TR0
The SCLKT0 bit in OSCCON register allows to select Timer 0 Subsidiary clock. This
allows to perform a Real-Time Clock function.
SCLKT0 = 0: Timer 0 uses the standard T0 pin as clock input (Standard mode).
SCLKT0 = 1: Timer 0 uses the special Sub Clock as clock input.
When the subclock input is selected for Timer 0 and the crystal oscillator is selected for
CPU and peripherals, the CKRL prescaler must be set to FF (division factor 2) in order
to assure a proper count on Timer 0.
With an external a 32 kHz oscillator, the timer interrupt can be set from 1/256 to 256
seconds to perform a Real-Time Clock (RTC) function. The power consumption will be
very low as the CPU is in idle mode at 32 kHz most of the time. When more CPU power
is needed, the internal RC oscillator is activated and used by the CPU and the others
peripherals.
Registers
Clock Control Register
10
The clock control register is used to define the clock system behavior.
Table 2. OSCCON - Clock Control Register (8Fh)
7
6
5
4
3
2
1
0
-
-
-
-
-
SCLKT0
OSCBEN
OSCAEN
Bit
Bit
Number
Mnemonic
7
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
6
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
5
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
4
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
3
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Description
AT8xC5112
4191C–8051–02/08
AT8xC5112
Bit
Bit
Number
Mnemonic
2
SCLKT0
Description
Sub Clock Timer0
Cleared by software to select T0 pin
Set by software to select T0 Sub Clock
1
OSCBEN
Enable RC oscillator
This bit is used to enable the high-speed RC oscillator
0: The oscillator is disabled
1: The oscillator is enabled.
0
OSCAEN
Enable crystal oscillator
This bit is used to enable the crystal oscillator
0: The oscillator is disabled
1: The oscillator is enabled.
Reset value = 0XXX X001b
Not bit addressable
Clock Selection Register
The clock selection register is used to define the clock system behavior
Table 3. CKSEL - Clock Selection Register (85h)
7
6
5
4
3
2
1
0
-
-
-
-
-
-
CKS
Bit
Bit
Number
Mnemonic
7
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
6
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
5
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
4
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
3
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
2
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
1
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
0
CKS
Description
Active oscillator selection
This bit is used to select the active oscillator.
1: The crystal oscillator is selected.
0: The high-speed RC oscillator is selected.
Reset value = XXXX XXX 1 b
Not bit addressable
11
4191C–8051–02/08
Clock Prescaler Register
This register is used to reload the clock prescaler of the CPU and peripheral clock.
Table 4. CKRL - Clock Prescaler Register (97h)
7
6
5
4
3
2
1
0
M
Bit
Bit
Number
Mnemonic
7: 0
CKRL
Description
0000 0000b: Division factor equal 512
1111 1111b: Division factor equal 2
M: Division factor equal 2*(256-M)
Reset value = 1111 1111b
Not bit addressable
Clock Control Register
This register is used to control the X2 mode of the CPU and peripheral clock.
Table 5. CKCON0 Register (8Fh)
7
6
5
4
3
2
1
0
-
WdX2
PcaX2
SiX2
-
T1X2
T0X2
X2
Bit
Number
7
6
Bit
Mnemonic Description
-
WdX2
Reserved
Watchdog clock (This control bit is validated when the CPU clock X2 is set; when
X2 is low, this bit has no effect)
Clear to select 6 clock periods per peripheral clock cycle.
Set to select 12 clock periods per peripheral clock cycle.
5
PcaX2
Programmable Counter Array clock (This control bit is validated when the CPU
clock X2 is set; when X2 is low, this bit has no effect)
Clear to select 6 clock periods per peripheral clock cycle.
Set to select 12 clock periods per peripheral clock cycle.
4
SiX2
Enhanced UART clock (Mode 0 and 2) (This control bit is validated when the
CPU clock X2 is set; when X2 is low, this bit has no effect)
Clear to select 6 clock periods per peripheral clock cycle.
Set to select 12 clock periods per peripheral clock cycle.
3
2
-
T1X2
Reserved
Timer 1 clock (This control bit is validated when the CPU clock X2 is set; when X2
is low, this bit has no effect)
Clear to select 6 clock periods per peripheral clock cycle.
Set to select 12 clock periods per peripheral clock cycle
1
T0X2
Timer 0 clock (This control bit is validated when the CPU clock X2 is set; when X2
is low, this bit has no effect)
Clear to select 6 clock periods per peripheral clock cycle.
Set to select 12 clock periods per peripheral clock cycle.
12
AT8xC5112
4191C–8051–02/08
AT8xC5112
Bit
Bit
Number
Mnemonic Description
CPU clock
0
Clear to select 12 clock periods per machine cycle (STD mode) for CPU and all the
peripherals.
X2
Set to select 6clock periods per machine cycle (X2 mode) and to enable the
individual peripherals "X2" bits.
Reset value = X000 0000b
Not bit addressable
Table 6. CKCON1 Register (AFh)
7
6
5
4
3
2
1
0
-
-
-
-
-
-
BRGX2
SPIX2
Bit
Bit
Number
Mnemonic
7
-
Reserved
6
-
Reserved
5
-
Reserved
4
-
Reserved
3
-
Reserved
2
-
Reserved
1
BRGX2
Description
BRG clock (This control bit is validated when the CPU clock X2 is set; when
X2 is low, this bit has no effect).
Clear to select 6 clock periods per peripheral clock cycle.
Set to select 12 clock periods per peripheral clock cycle.
0
SPIX2
SPI clock (This control bit is validated when the CPU clock X2 is set; when X2
is low, this bit has no effect)
Clear to select 6 clock periods per peripheral clock cycle.
Set to select 12 clock periods per peripheral clock cycle.
Reset value = XXXX XX00b
Not bit addressable
13
4191C–8051–02/08
AT8xC5112
Reset and Power
Management
The power monitoring and management can be used to supervise the Power Supply
(VDD) and to start up properly when AT8xC5112 is powered up.
It consists of the features listed below and explained hereafter:
•
Power-off flag
•
Idle mode
•
Power-down mode
•
Reduced EMI mode
All these features are controlled by several registers, the Power Control register (PCON)
and the Auxiliary register (AUXR) detailed at the end of this section.
AUX register not available on all versions.
Functional Description
Figure 1 shows the block diagram of the possible sources of microcontroller reset.
Figure 1. Reset Sources
RST Pin(1)
Hardware WD
Reset
RST Pin(2)
PCA WD
Notes:
Power-off Flag
1. RST pin available only on 48 and 52 pins versions.
2. RST pin available only on LPC versions.
When the power is turned off or fails, the data retention is not guaranteed. A Power-off
Flag (POF, Table 8 on page 15) allows to detect this condition. POF is set by hardware
during a reset which follows a power-up or a power-fail. This is a cold reset. A warm
reset is an external or a watchdog reset without power failure, hence which preserves
the internal memory content and POF. To use POF, test and clear this bit just after
reset. Then it will be set only after a cold reset.
14
4191C–8051–02/08
Registers
PCON: Power Configuration
Register
Table 1. PCON Register (87h)
7
6
5
4
3
2
1
0
SMOD1
SMOD0
–
POF
GF1
GF0
PD
IDL
Bit
Number
Bit
Mnemonic
7
SMOD1
Double Baud Rate bit
Set to double the Baud Rate when Timer 1 is used and mode 1, 2 or 3 is
selected in SCON register.
6
SMOD0
SCON Select bit
When cleared, read/write accesses to SCON.7 are to SM0 bit and read/write
accesses to SCON.6 are to SM1 bit.
When set, read/write accesses to SCON.7 are to FE bit and read/write
accesses to SCON.6 are to OVR bit. SCON is Serial Port Control register.
5
–
Description
Reserved
Must be cleared.
4
POF
Power-off flag
Set by hardware when VDD rises above VRET+ to indicate that the Power Supply
has been set off.
Must be cleared by software.
3
GF1
General Purpose flag 1
One use is to indicate wether an interrupt occurred during normal operation or
during Idle mode.
2
GF0
General Purpose flag 0
One use is to indicate wether an interrupt occurred during normal operation or
during Idle mode.
PD
Power-down Mode bit
Cleared by hardware when an interrupt or reset occurs.
Set to activate the Power-down mode.
If IDL and PD are both set, PD takes precedence.
IDL
Idle Mode bit
Cleared by hardware when an interrupt or reset occurs.
Set to activate the Idle mode.
If IDL and PD are both set, PD takes precedence.
1
0
Reset value = 0000 0000b
Port Pins
The value of port pins in the different operating modes is shown on Table 9.
Table 2. Pin Conditions in Special Operating Modes
15
Mode
Program Memory
Port 1 Pins
Port 3 Pins
Port 4 Pins
Reset
Don’t care
Weak High
Weak High
Weak High
Idle
Internal
Data
Data
Data
Power-down
Internal
Data
Data
Data
AT8xC5112
4191C–8051–02/08
AT8xC5112
Reduced EMI Mode
The ALE signal is used to demultiplex address and data buses on port 0 when used with
external program or data memory. Nevertheless, during internal code execution, ALE
signal is still generated. In order to reduce EMI, ALE signal can be disabled by setting
AO bit.
The AO bit is located in AUXR register at bit location 0. As soon as AO is set, ALE is no
longer output but remains active during MOVX and MOVC instructions and external
fetches. During ALE disabling, ALE pin is weakly pulled high.
Table 11. AUXR Register
AUXR - Auxiliary Register (8Eh)
7
6
5
4
3
2
1
0
-
-
-
-
-
-
-
AO
Bit
Number
Bit
Mnemonic
7
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
6
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
5
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
4
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
3
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
2
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
1
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
0
AO
Description
ALE Output bit
Clear to restore ALE operation during internal fetches.
Set to disable ALE operation during internal fetches.
Reset value = XXXX XXX0b
Not bit addressable
17
4191C–8051–02/08
AT8xC5112
Hardware Watchdog
Timer (WDT)
The WDT is intended as a recovery method in situations where the CPU may be subjected to software upset. The WDT consists of a 14-bit counter and the Watchdog Timer
Reset (WDTRST) SFR. The WDT is by default disabled from exiting reset. To enable
the WDT, the user must write 01EH and 0E1H in sequence to the WDTRST, SFR location 0A6H. When WDT is enabled, it will increment every machine cycle (6 internal clock
periods) and there is no way to disable the WDT except through reset (either hardware
reset or WDT overflow reset). The T0 bit of the WDTPRG register is used to select the
overflow after 10 or 14 bits. When WDT overflows, it will generate an internal reset. It
will also drive an output RESET HIGH pulse at the emulator RST-pin. The length of the
reset pulse is 24 clock periods of the WD clock.
Using the WDT
To enable the WDT, the user must write 01EH and 0E1H in sequence to the WDTRST,
SFR location 0A6H. When WDT is enabled, the user needs to service it by writing to
01EH and 0E1H to WDTRST to avoid WDT overflow. The 14-bit counter overflows when
it reaches 16383 (3FFFH) or 1024 (1FFFH) and this will reset the device. When WDT is
enabled, it will increment every machine cycle while the oscillator is running. This means
the user must reset the WDT at least every 16383 machine cycle. To reset the WDT the
user must write 01EH and 0E1H to WDTRST. WDTRST is a write only register. The
WDT counter cannot be read or written. When WDT overflows, it will generate an output
RESET pulse at the RST pin. The RESET pulse duration is 96 x TOSC, where TOSC =
1/FOSC . To make the best use of the WDT, it should be serviced in those sections of
code that will periodically be executed within the time required to prevent a WDT reset.
To have a more powerful WDT, a 27 counter has been added to extend the Time-out
capability, ranking from 16 ms to 2s at FOSC = 12 MHz and T0 = 0. To manage this feature, refer to WDTPRG register description, Table 11 (SFR0A7h).
Table 1. WDTRST Register
WDTRST Address (0A6h)
Reset value
7
6
5
4
3
2
1
X
X
X
X
X
X
X
Write only, this SFR is used to reset/enable the WDT by writing 01EH then 0E1H in
sequence.
16
4191C–8051–02/08
Table 2. WDTPRG Register
WDTPRG Address (0A7h)
7
6
5
4
3
2
1
0
T4
T3
T2
T1
T0
S2
S1
S0
Bit
Number
Bit
Mnemonic
7
T4
6
T3
5
T2
4
T1
3
T0
Description
Reserved
Do not try to set this bit.
WDT overflow select bit
0: Overflow after 14 bits
1: Overflow after 10 bits
2
S2
WDT Time-out select bit 2
1
S1
WDT Time-out select bit 1
0
S0
WDT Time-out select bit 0
S2
0
0
0
0
1
1
1
1
S1
0
0
1
1
0
0
1
1
S0
0
1
0
1
0
1
0
1
Selected Time-out with T0 = 0
(214 - 1) machine cycles, 16.3 ms at 12 MHz
(215 - 1) machine cycles, 32.7 ms at 12 MHz
(216 - 1) machine cycles, 65.5 ms at 12 MHz
(217 - 1) machine cycles, 131 ms at 12 MHz
(218 - 1) machine cycles, 262 ms at 12 MHz
(219 - 1) machine cycles, 542 ms at 12 MHz
(220 - 1) machine cycles, 1.05 s at 12 MHz
(221 - 1) machine cycles, 2.09 s at 12 MHz
Reset value = XXX0 0000
Write only register
WDT During Power-down and
Idle
Power-down
In Power-down mode the oscillator stops, which means the WDT also stops. While in
Power-down mode the user does not need to service the WDT. There are 2 methods of
exiting Power-down mode: by a hardware reset or via a level activated external interrupt
which is enabled prior to entering Power-down mode. When Power-down is exited with
hardware reset, servicing the WDT should occur as normal whenever the AT8xC5112 is
reset. Exiting Power-down with an interrupt is significantly different. The interrupt is held
low long enough for the oscillator to stabilize. When the interrupt is brought high, the
interrupt is serviced. To prevent the WDT from resetting the device while the interrupt
pin is held low, the WDT is not started until the interrupt is pulled high. It is suggested
that the WDT be reset during the interrupt service routine.
To ensure that the WDT does not overflow within a few states of exiting of power-down,
it is best to reset the WDT just before entering power-down.
In Idle mode, the oscillator continues to run. To prevent the WDT from resetting the
AT8xC5112 while in Idle mode, the user should always set up a timer that will periodically exit Idle, service the WDT, and re-enter Idle mode.
Idle Mode
17
AT8xC5112
4191C–8051–02/08
AT8xC5112
Ports
All port 1, port 3 and port 4 I/O port pins on the AT8xC5112 may be software configured
to one of four types on a bit-by-bit basis, as shown in Table 14. These are: Quasi bidirectional (standard 80C51 port outputs), push-pull, open drain, and input-only. Two
configuration registers for each port choose the output type for each port pin.
Table 14. Port Output Configuration settings using PxM1 and PxM2 registers
PxM1.y Bit
PxM2.y Bit
Port Output Mode
0
0
Quasi bi-directional
0
1
Push-pull
1
0
Input-only (High Impedance)
1
1
Open Drain
Port Types
Quasi bi-directional Output
Configuration
The default port output configuration for standard AT8xC5112 I/O ports is the Quasi bidirectional output that is common on the 80C51 and most of its derivatives. This output
type can be used as both an input and output without the need to reconfigure the port.
This is possible because when the port outputs a logic high, it is weakly driven, allowing
an external device to pull the pin low. When the pin is pulled low, it is driven strongly and
able to sink a fairly large current. These features are somewhat similar to an open drain
output except that there are three pull-up transistors in the Quasi bi-directional output
that serve different purposes. One of these pull-ups, called the "very weak" pull-up, is
turned on whenever the port latch for the pin contains a logic 1. The very weak pull-up
sources a very small current that will pull the pin high if it is left floating. A second pullup, called the "weak" pull-up, is turned on when the port latch for the pin contains a logic
1 and the pin itself is also at a logic 1 level. This pull-up provides the primary source current for a Quasi bi-directional pin that is outputting a 1. If a pin that has a logic 1 on it is
pulled low by an external device, the weak pull-up turns off, and only the very weak pullup remains on. In order to pull the pin low under these conditions, the external device
has to sink enough current to overpower the weak pull-up and take the voltage on the
port pin below its input threshold.
The third pull-up is referred to as the "strong" pull-up. This pull-up is used to speed up
low-to-high transitions on a Quasi bi-directional port pin when the port latch changes
from a logic 0 to a logic 1. When this occurs, the strong pull-up turns on for a brief time,
two CPU clocks, in order to pull the port pin high quickly. Then it turns off again.
The Quasi bi-directional port configuration is shown in Figure 2.
20
4191C–8051–02/08
Figure 2. Quasi bi-directional Output
2 CPU
CLOCK DELAY
P
Strong
P
Very
Weak
P
Weak
Pin
Port latch
Data
N
Input
Data
Open Drain Output
Configuration
The open-drain output configuration turns off all pull-ups and only drives the pull-down
transistor of the port driver when the port latch contains a logic 0. To be used as a logic
output, a port configured in this manner must have an external pull-up, typically a resistor tied to VDD. The pull-down for this mode is the same as for the Quasi bi-directional
mode. The open-drain port configuration is shown in Figure 3.
Figure 3. Open-drain Output
Pin
Port latch
Data
N
Input
Data
Push-pull Output
Configuration
21
The push-pull output configuration has the same pull-down structure as both the open
drain and the Quasi bi-directional output modes, but provides a continuous strong pullup when the port latch contains a logic 1. The push-pull mode may be used when more
source current is needed from a port output. The push-pull port configuration is shown in
Figure 4.
AT8xC5112
4191C–8051–02/08
AT8xC5112
Figure 4. Push-pull Output
P
Strong
Pin
Port Latch
Data
N
Input
Data
Input-only Configuration
The input-only configuration is a pure input with neither pull-up nor pull-down.
The input-only configuration is shown in Figure 4.
Figure 5. Input-only
Input
Data
Pin
Ports Description
Ports P1, P3 and P4
Every output on the AT8xC5112 may potentially be used as a 20 mA sink LED drive output. However, there is a maximum total output current for all ports which must not be
exceeded. All ports pins of the AT8xC5112 have slew rate controlled outputs. This is to
limit noise generated by quickly switching output signals. The slew rate is factory set to
approximately 10 ns rise and fall times.
The inputs of each I/O port of the AT8xC5112 are TTL level Schmitt triggers with
hysteresis.
Ports P0 and P2
High pin-count version of the AT8xC5112 has standard address and data ports P0 and
P2. These ports are standard C51 ports (Quasi bi-directional I/O). The control lines are
provided on the pins: ALE, PSEN, EA, Reset; RD and WR signals are on the bits P1.1
and P1.0.
22
4191C–8051–02/08
Registers
Table 15. P1M1 Register
P1M1 Address (D4h)
7
6
5
4
3
2
1
0
P1M1.7
P1M1.6
P1M1.5
P1M1.4
P1M1.3
P1M1.2
P1M1.1
P1M1.0
Bit
Bit
Number
Mnemonic
7: 0
P1M1.x
Description
Port Output configuration bit
See Table 10 for configuration definition
Reset value = 0000 00XX
Table 16. P1M2 Register
P1M2 Address (E2h)
7
6
5
4
3
2
1
0
P1M2.7
P1M2.6
P1M2.5
P1M2.4
P1M2.3
P1M2.2
P1M2.1
P1M2.0
Bit
Bit
Number
Mnemonic
7: 0
P1M2.x
Description
Port Output configuration bit
See Table 10 for configuration definition
Reset value = 0000 00XX
Table 17. P3M1 Register
P3M1 Address (D5h)
7
6
5
4
3
2
1
0
P3M1.7
P3M1.6
P3M1.5
P3M1.4
P3M1.3
P3M1.2
P3M1.1
P3M1.0
Bit
Bit
Number
Mnemonic
7: 0
P3M1.x
Description
Port Output configuration bit
See Table 10 for configuration definition
Reset value = 0000 0000
23
AT8xC5112
4191C–8051–02/08
AT8xC5112
Table 18. P3M2 Register
P3M2 Address (E4h)
7
6
5
4
3
2
1
0
P3M2.7
P3M2.6
P3M2.5
P3M2.4
P3M2.3
P3M2.2
P3M2.1
P3M2.0
Bit
Bit
Number
Mnemonic
7: 0
P3M2.x
Description
Port Output configuration bit
See Table 10 for configuration definition
Reset value = 0000 0000
Table 19. P4M1 Register
P4M1 Address (D6h)
7
6
5
4
3
2
1
0
P4M1.7
P4M1.6
P4M1.5
P4M1.4
P4M1.3
P4M1.2
P4M1.1
P4M1.0
Bit
Bit
Number
Mnemonic
7: 0
P4M1.x
Description
Port Output configuration bit
See Table 10 for configuration definition
Reset value = 0000 0000
Table 20. P4M2 Register
P4M2 Address (E5h)
7
6
5
4
3
2
1
0
P4M2.7
P4M2.6
P4M2.5
P4M2.4
P4M2.3
P4M2.2
P4M2.1
P4M2.0
Bit
Bit
Number
Mnemonic
7: 0
P4M2.x
Description
Port Output configuration bit
See Table 10 for configuration definition
Reset value = 0000 0000
24
4191C–8051–02/08
AT8xC5112
Dual Data Pointer
Register
The additional data pointer can be used to speed up code execution and reduce code
size in a number of ways.
The dual DPTR structure is a way by which the chip will specify the address of an external data memory location. There are two 16-bit DPTR registers that address the external
memory, and a single bit called DPS = AUXR1/bit0 (see Table 19) that allows the program code to switch between them (See Figure 6).
Figure 1. Use of Dual Pointer
External Data Memory
7
0
DPS
DPTR1
DPTR0
AUXR1(A2H)
DPH(83H) DPL(82H)
Table 1. AUXR1: Auxiliary Register 1
7
6
5
4
3
2
1
0
-
-
-
-
-
-
-
DPS
Bit
Number
Note:
Bit
Mnemonic Description
7
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
6
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
5
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
4
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
3
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
2
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
1
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
0
DPS
Data Pointer Selection
Clear to select DPTR0.
Set to select DPTR1.
User software should not write 1s to reserved bits. These bits may be used in future 8051
family products to invoke new features. In that case, the reset value of the new bit will be
0, and its active value will be 1. The value read from a reserved bit is indeterminate.
23
4191C–8051–02/08
Application
Software can take advantage of the additional data pointers to both increase speed and
reduce code size, for example, block operations (copy, compare, search...) are well
served by using one data pointer as a ’source’ pointer and the other one as a "destination" pointer.
ASSEMBLY LANGUAGE
; Block move using dual data pointers
; Destroys DPTR0, DPTR1, A and PSW
; note: DPS exits opposite of entry state
; unless an extra INC AUXR1 is added
;
00A2
AUXR1 EQU 0A2H
;
0000 909000MOV DPTR,#SOURCE ; address of SOURCE
0003 05A2 INC AUXR1 ; switch data pointers
0005 90A000 MOV DPTR,#DEST ; address of DEST
0008 LOOP:
0008 05A2 INC AUXR1 ; switch data pointers
000A E0 MOVX A,atDPTR ; get a byte from SOURCE
000B A3 INC DPTR ; increment SOURCE address
000C 05A2 INC AUXR1 ; switch data pointers
000E F0 MOVX atDPTR,A ; write the byte to DEST
000F A3 INC DPTR ; increment DEST address
0010 70F6JNZ LOOP ; check for 0 terminator
0012 05A2 INC AUXR1 ; (optional) restore DPS
INC is a short (2 bytes) and fast (12 clocks) way to manipulate the DPS bit in the AUXR1
SFR. However, note that the INC instruction does not directly force the DPS bit to a particular state, but simply toggles it. In simple routines, such as the block move example,
only the fact that DPS is toggled in the proper sequence matters, not its actual value. In
other words, the block move routine works the same whether DPS is '0' or '1' on entry.
Observe that without the last instruction (INC AUXR1), the routine will exit with DPS in
the opposite state.
24
AT8xC5112
4191C–8051–02/08
AT8xC5112
Serial I/O Ports
Enhancements
The serial I/O ports in the AT8xC5112 are compatible with the serial I/O port in the
80C52.
They provide both synchronous and asynchronous communication modes. They operate as Universal Asynchronous Receiver and Transmitter (UART) in three full-duplex
modes (modes 1, 2 and 3). Asynchronous transmission and reception can occur simultaneously and at different baud rates.
Serial I/O ports include the following enhancements:
Framing Error Detection
•
Framing error detection
•
Automatic address recognition
Framing bit error detection is provided for the three asynchronous modes (modes 1, 2
and 3). To enable the framing bit error detection feature, set SMOD0 bit in PCON register (see Figure 7).
Figure 1. Framing Error Block Diagram
SM0/FE
SM1
SM2
REN
TB8
RB8
TI
SCON for UART (98h) (SCON_1 for UART_1 (C0h))
RI
Set FE bit if stop bit is 0 (framing error) (SMOD0 = 1 for UART)
SM0 to UART mode control (SMOD0 = 0 for UART)
SMOD1
SMOD0
POF
-
GF1
GF0
PD
PCON for UART (87h) (SMOD bits for UART_1
are located in BDRCON_1)
IDL
To UART framing error control
When this feature is enabled, the receiver checks each incoming data frame for a valid
stop bit. An invalid stop bit may result from noise on the serial lines or from simultaneous
transmission by two CPUs. If a valid stop bit is not found, the Framing Error bit (FE) in
SCON register (see Table 25) bit is set.
Software may examine FE bit after each reception to check for data errors. Once set,
only software or a reset can clear FE bit. Subsequently received frames with valid stop
bits cannot clear FE bit. When FE feature is enabled, RI rises on stop bit instead of the
last data bit (see Figure 8 and Figure 9).
Figure 2. UART Timings in Mode 1
D0
RXD
Start
Bit
D1
D2
D3
D4
D5
Data Byte
D6
D7
Stop
Bit
RI
SMOD0 = X
FE
SMOD0 = 1
25
4191C–8051–02/08
Figure 3. UART Timings in Modes 2 and 3
D0
D1
D2
D3
RXD
Start
Bit
D4
D5
Data Byte
D6
D7
D8
Ninth Stop
Bit Bit
RI
SMOD0 = 0
RI
SMOD0 = 1
FE
SMOD0 = 1
Automatic Address
Recognition
The automatic address recognition feature is enabled for each UART when the multiprocessor communication feature is enabled (SM2 bit in SCON register is set).
Implemented in hardware, automatic address recognition enhances the multiprocessor
communication feature by allowing the serial port to examine the address of each
incoming command frame. Only when the serial port recognizes its own address, the
receiver sets RI bit in SCON register to generate an interrupt. This ensures that the CPU
is not interrupted by command frames addressed to other devices.
If desired, you may enable the automatic address recognition feature in mode 1. In this
configuration, the stop bit takes the place of the ninth data bit. Bit RI is set only when the
received command frame address matches the device’s address and is terminated by a
valid stop bit.
To support automatic address recognition, a device is identified by a given address and
a broadcast address.
Note:
Given Address
The multiprocessor communication and automatic address recognition features cannot
be enabled in mode 0 (i.e., setting SM2 bit in SCON register in mode 0 has no effect).
Each UART has an individual address that is specified in SADDR register; the SADEN
register is a mask byte that contains don’t care bits (defined by zeros) to form the
device’s given address. The don’t care bits provide the flexibility to address one or more
slaves at a time. The following example illustrates how a given address is formed.
To address a device by its individual address, the SADEN mask byte must be 1111
1111b.
For example:
SADDR0101 0110b
SADEN1111 1100b
Given0101 01XXb
The following is an example of how to use given addresses to address different slaves:
Slave A:SADDR1111 0001b
SADEN1111 1010b
Given1111 0X0Xb
Slave B:SADDR1111 0011b
SADEN1111 1001b
Given1111 0XX1b
Slave C:SADDR1111 0010b
SADEN1111 1101b
Given1111 00X1b
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AT8xC5112
The SADEN byte is selected so that each slave may be addressed separately.
For slave A, bit 0 (the LSB) is a don’t care bit; for slaves B and C, bit 0 is a 1. To communicate with slave A only, the master must send an address where bit 0 is clear (e.g.
1111 0000b).
For slave A, bit 1 is a 1; for slaves B and C, bit 1 is a don’t care bit. To communicate with
slaves B and C, but not slave A, the master must send an address with bits 0 and 1 both
set (e.g. 1111 0011b).
To communicate with slaves A, B and C, the master must send an address with bit 0
set, bit 1 clear, and bit 2 clear (e.g. 1111 0001b).
Broadcast Address
A broadcast address is formed from the logical OR of the SADDR and SADEN registers
with zeros defined as don’t care bits, e.g.:
SADDR 0101 0110b
SADEN 1111 1100b
Broadcast
= SADDR OR SADEN1111 111Xb
The use of don’t care bits provides flexibility in defining the broadcast address, however
in most applications, a broadcast address is FFh. The following is an example of using
broadcast addresses:
Slave A:SADDR1111 0001b
SADEN1111 1010b
Broadcast1111 1X11b,
Slave B:SADDR1111 0011b
SADEN1111 1001b
Broadcast1111 1X11B,
Slave C:SADDR = 1111 0010b
SADEN1111 1101b
Broadcast1111 1111b
For slaves A and B, bit 2 is a don’t care bit; for slave C, bit 2 is set. To communicate with
all of the slaves, the master must send an address FFh. To communicate with slaves A
and B, but not slave C, the master can send and address FBh.
Reset Addresses
On reset, the SADDR and SADEN registers are initialized to 00h, i.e. the given and
broadcast addresses are XXXX XXXXb (all don’t care bits). This ensures that the serial
port will reply to any address, and so, that it is backwards compatible with the 80C51
microcontrollers that do not support automatic address recognition.
Baud Rate Selection for
UART for Modes 1 and 3
The Baud Rate Generator for transmit and receive clocks can be selected separately via
the T2CON and BDRCON registers.
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4191C–8051–02/08
Figure 4. Baud Rate Selection
TIMER1_BRG
0
/ 16
Rx Clock
1
INT_BRG
RBCK
TIMER1_BRG
0
/ 16
1
Tx Clock
INT_BRG
TBCK
Table 1. Baud Rate Selection Table for UART
Internal Baud Rate Generator
(BRG)
TBCK
RBCK
Clock Source for UART Tx
Clock Source
UART Rx
0
0
Timer 1
Timer 1
1
0
INT_BRG
Timer 1
0
1
Timer 1
INT_BRG
1
1
INT_BRG
INT_BRG
When the internal Baud Rate Generator is used, the Baud Rates are determined by the
BRG overflow depending on the BRL reload value, the X2 bit in CKON0 register, the
value of SPD bit (Speed Mode) in BDRCON register and the value of the SMOD1 bit in
PCON register (for UART).
Figure 5. Internal Baud Rate Generator
SMOD1
/2
0
Peripheral Clock
/6
0
Auto Reload Counter
BRG
Overflow
INT_BRG
1
1
BRL
SPD
BRR
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AT8xC5112
for UART:
Baud_Rate =
2SMOD1 x 2X2 x FXTAL
2 x 2 x 6(1-SPD) x 16 x [256 - (BRL)]
(BRL) = 256 -
2SMOD1 x 2X2 x FXTAL
2 x 2 x 6(1-SPD) x 16 x Baud_Rate
Example of computed value when X2 = 1, SMOD1 = 1, SPD = 1
Baud Rates
FXTAL = 16.384 MHz
FXTAL = 24 MHz
BRL
Error (%)
BRL
Error (%)
115200
247
1.23
243
0.16
57600
238
1.23
230
0.16
38400
229
1.23
217
0.16
28800
220
1.23
204
0.16
19200
203
0.63
178
0.16
9600
149
0.31
100
0.16
4800
43
1.23
-
-
Example of computed value when X2 = 0, SMOD1 = 0, SPD = 0
Baud Rates
FOSC = 16.384 MHz
FOSC = 24 MHz
BRL
Error (%)
BRL
Error (%)
4800
247
1.23
243
0.16
2400
238
1.23
230
0.16
1200
220
1.23
202
3.55
600
185
0.16
152
0.16
The baud rate generator can be used for mode 1 or 3 (See Figure 10), but also for mode
0 for both UARTs, thanks to the bit SRC located in BDRCON register (see Table 27).
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4191C–8051–02/08
UART Registers
Table 2. SADEN - Slave Address Mask Register for UART (B9h)
7
6
5
4
3
2
1
0
2
1
0
2
1
0
Reset value = 0000 0000b
Table 3. SADDR - Slave Address Register for UART (A9h)
7
6
5
4
3
Reset value = 0000 0000b
Table 4. SBUF - Serial Buffer Register for UART (99h)
7
6
5
4
3
Reset value = XXXX XXXXb
Table 5. BRL - Baud Rate Reload Register for the Internal Baud Rate Generator, UART
- UART(9Ah)
7
6
5
4
3
2
1
0
Reset value = 0000 0000b
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AT8xC5112
Table 6. SCON Register
SCON - Serial Control Register for UART (98h)
7
6
5
4
3
2
1
0
FE/SM0
SM1
SM2
REN
TB8
RB8
TI
RI
Bit
Bit
Number Mnemonic Description
7
FE
Framing Error bit (SMOD0 = 1) for UART
Clear to reset the error state, not cleared by a valid stop bit.
Set by hardware when an invalid stop bit is detected.
SMOD0 must be set to enable access to the FE bit
SM0
Serial Port Mode bit 0 (SMOD0 = 0) for UART
Refer to SM1 for serial port mode selection.
SMOD0 must be cleared to enable access to the SM0 bit
Serial Port Mode bit 1 for UART
SM0 SM1 Mode Description Baud Rate
6
SM1
0
0
1
1
0
1
0
1
0
1
2
3
Shift Register
8-bit UART
9-bit UART
9-bit UART
FXTAL/12 (FXTAL/6 X2 mode)
Variable
FXTAL/64 or FXTAL/32 (FXTAL/32 or FXTAL/16 X2 mode)
Variable
5
SM2
Serial Port Mode 2 bit/Multiprocessor Communication Enable bit for UART
Clear to disable multiprocessor communication feature.
Set to enable multiprocessor communication feature in mode 2 and 3, and
eventually mode 1. This bit should be cleared in mode 0.
4
REN
Reception Enable bit for UART
Clear to disable serial reception.
Set to enable serial reception.
3
TB8
Transmitter Bit 8/Ninth bit to transmit in modes 2 and 3 for UART.
2
RB8
Clear to transmit a logic 0 in the 9th bit.
Set to transmit a logic 1 in the 9th bit.
Receiver Bit 8/Ninth bit received in modes 2 and 3 for UART
Cleared by hardware if 9th bit received is a logic 0.
Set by hardware if 9th bit received is a logic 1.
In mode 1, if SM2 = 0, RB8 is the received stop bit. In mode 0 RB8 is not used.
1
0
TI
Transmit Interrupt flag for UART
Clear to acknowledge interrupt.
Set by hardware at the end of the 8th bit time in mode 0 or at the beginning of the
stop bit in the other modes.
RI
Receive Interrupt flag for UART
Clear to acknowledge interrupt.
Set by hardware at the end of the 8th bit time in mode 0, see Figure 8 and Figure 9
in the other modes.
Reset value = 0000 0000b
Bit addressable
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4191C–8051–02/08
Table 7. PCON Register
PCON - Power Control Register (87h)
7
6
5
4
3
2
1
0
SMOD1
SMOD0
RSTD
POF
GF1
GF0
PD
IDL
Bit
Number
Bit
Mnemonic Description
7
SMOD1
Serial Port Mode bit 1 for UART
Set to select double baud rate in mode 1, 2 or 3.
6
SMOD0
Serial Port Mode bit 0 for UART
Clear to select SM0 bit in SCON register.
Set to to select FE bit in SCON register.
5
RSTD
Reset Detector Disable Bit
Clear to disable PFD.
Set to enable PFD.
4
POF
Power-off Flag
Clear to recognize next reset type.
Set by hardware when VCC rises from 0 to its nominal voltage. Can also be set
by software.
3
GF1
General-purpose Flag
Cleared by user for general purpose usage.
Set by user for general purpose usage.
2
GF0
General-purpose Flag
Cleared by user for general purpose usage.
Set by user for general purpose usage.
1
PD
Power-down Mode bit
Cleared by hardware when reset occurs.
Set to enter Power-down mode.
0
IDL
Idle Mode bit
Clear by hardware when interrupt or reset occurs.
Set to enter idle mode.
Reset value = 0001 0000b
Not bit addressable
Power-off flag reset value will be 1 only after a power on (cold reset). A warm reset
doesn’t affect the value of this bit.
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AT8xC5112
Table 8. BDRCON Register
BDRCON - Baud Rate Control Register (9Bh)
7
6
5
4
3
2
1
0
-
-
-
BRR
TBCK
RBCK
SPD
SRC
Bit
Number
Bit
Mnemonic
7
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
6
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
5
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
4
BRR
Baud Rate Run Control bit
Clear to stop the internal Baud Rate Generator.
Set to start the internal Baud Rate Generator.
3
TBCK
Transmission Baud rate Generator Selection bit for UART
Clear to select Timer 1 or Timer 2 for the Baud Rate Generator.
Set to select internal Baud Rate Generator.
2
RBCK
Reception Baud Rate Generator Selection bit for UART
Clear to select Timer 1 or Timer 2 for the Baud Rate Generator.
Set to select internal Baud Rate Generator.
1
SPD
0
SRC
Description
Baud Rate Speed Control bit for UART
Clear to select the SLOW Baud Rate Generator.
Set to select the FAST Baud Rate Generator.
Baud Rate Source Select bit in Mode 0 for UART
Clear to select FOSC/12 as the Baud Rate Generator (FOSC/6 in X2 mode).
Set to select the internal Baud Rate Generator for UARTs in mode 0.
Reset value = XXX0 0000b
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4191C–8051–02/08
AT8xC5112
Serial Port Interface
(SPI)
The Serial Peripheral Interface (SPI) module which allows full-duplex, synchronous,
serial communication between the MCU and peripheral devices, including other MCUs.
Features
Features of the SPI module include the following:
Signal Description
•
Full-duplex, three-wire synchronous transfers
•
Master operation
•
Eight programmable Master clock rates
•
Serial clock with programmable polarity and phase
•
Master Mode fault error flag with MCU interrupt capability
•
Write collision flag protection
Figure 12 shows a typical SPI bus configuration using one Master controller and many
Slave peripherals. The bus is made of three wires connecting all the devices:
Figure 1. Typical SPI bus
Slave 4
MISO
MOSI
SCK
SS
Slave 1
VDD
Slave 3
MISO
MOSI
SCK
SS
MISO
MOSI
SCK
SS
0
1
2
3
MISO
MOSI
SCK
SS
PORT
Master
MISO
MOSI
SCK
SS
Slave 2
The Master device selects the individual Slave devices by using four pins of a parallel
port to control the four SS pins of the Slave devices.
Master Output Slave Input
(MOSI)
This 1-bit signal is directly connected between the Master Device and a Slave Device.
The MOSI line is used to transfer data in series from the Master to the Slave. Therefore,
it is an output signal from the Master, and an input signal to a Slave. A byte (8-bit word)
is transmitted most significant bit (MSB) first, least significant bit (LSB) last.
Master Input Slave Output
(MISO)
This 1-bit signal is directly connected between the Slave Device and a Master Device.
The MISO line is used to transfer data in series from the Slave to the Master. Therefore,
it is an output signal from the Slave, and an input signal to the Master. A byte (8-bit
word) is transmitted most significant bit (MSB) first, least significant bit (LSB) last.
SPI Serial Clock (SCK)
This signal is used to synchronize the data movement both in and out the devices
through their MOSI and MISO lines. It is driven by the Master for eight clock cycles
which allows to exchange one byte on the serial lines.
Slave Select (SS)
Each Slave peripheral is selected by one Slave Select pin (SS). This signal must stay
low for any message for a Slave. It is obvious that only one Master (SS high level) can
drive the network. The Master may select each Slave device by software through port
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4191C–8051–02/08
pins (see Figure 12). To prevent bus conflicts on the MISO line, only one slave should
be selected at a time by the Master for a transmission.
In a Master configuration, the SS line can be used in conjunction with the MODF flag in
the SPI Status register (SPSTA) to prevent multiple masters from driving MOSI and
SCK (see Error Conditions).
Baud Rate
In Master mode, the baud rate can be selected from a baud rate generator which is controled by three bits in the SPCON register: SPR2, SPR1 and SPR0. The Master clock is
chosen from one of seven clock rates resulting from the division of the internal clock by
2, 4, 8, 16, 32, 64 or 128, or an external clock.
Table 28 gives the different clock rates selected by SPR2:SPR1:SPR0.
Table 1. SPI Master Baud Rate Selection
35
SPR2:SPR1:SPR0
Clock Rate
Baud Rate Divisor (BD)
000
FCkIdle /2
2
001
FCkIdle /4
4
010
FCkIdle/8
8
011
FCkIdle/16
16
100
FCkIdle /32
32
101
FCkIdleH /64
64
110
FCkIdle /128
128
111
External clock
Output of BRG
AT8xC5112
4191C–8051–02/08
AT8xC5112
Functional Description
Figure 13 shows a detailed structure of the SPI module.
Figure 2. SPI Module Block Diagram
Internal Bus
SPDAT
Shift Register
CkIdle
Clock
Divider
7
/2
/4
/8
/16
/32
/64
/128
6
5
4
2
1
0
Receive Data Register
Pin
Control
Logic
Clock
Logic
Clock
Select
External Clk
3
MOSI
MISO
M
S
SCK
SS
SPR2 SPEN SSDIS MSTR CPOL CPHA SPR1 SPR0
SPCON
SPI
Control
SPI Interrupt Request
8-bit Bus
1-bit Signal
SPSTA
SPIF WCOL
Operating Modes
-
MODF
-
-
-
-
The Serial Peripheral Interface can be configured as Master mode only. The configuration and initialization of the SPI module is made through one register:
•
The Serial Peripheral CONtrol register (SPCON)
Once the SPI is configured, the data exchange is made using:
•
SPCON
•
The Serial Peripheral STAtus register (SPSTA)
•
The Serial Peripheral DATa register (SPDAT)
During an SPI transmission, data is simultaneously transmitted (shifted out serially) and
received (shifted in serially). A serial clock line (SCK) synchronizes shifting and sampling on the two serial data lines (MOSI and MISO).
When the Master device transmits data to the Slave device via the MOSI line, the Slave
device responds by sending data to the Master device via the MISO line. This implies
full-duplex transmission with both data out and data in synchronized with the same clock
(Figure 14).
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4191C–8051–02/08
Figure 3. Full-Duplex Master-slave Interconnection
8-bit Shift register
SPI
Clock Generator
MISO
MISO
MOSI
MOSI
SCK
SS
8-bit Shift register
SCK
SS
VDD
Master MCU
VSS
Slave MCU
The SPI operates in Master mode. Only one Master SPI device can initiate transmissions. Software begins the transmission from a Master SPI module by writing to the
Serial Peripheral Data Register (SPDAT). If the shift register is empty, the byte is immediately transferred to the shift register. The byte begins shifting out on MOSI pin under
the control of the serial clock, SCK. Simultaneously, another byte shifts in from the
Slave on the Master’s MISO pin. The transmission ends when the Serial Peripheral
transfer data flag, SPIF, in SPSTA becomes set. At the same time that SPIF becomes
set, the received byte from the Slave is transferred to the receive data register in
SPDAT. Software clears SPIF by reading the Serial Peripheral Status register (SPSTA)
with the SPIF bit set, and then reading the SPDAT.
Master Mode
When the pin SS is pulled down during a transmission, the data is interrupted and when
the transmission is established again, the data present in the SPDAT is present.
Transmission Formats
Software can select any of four combinations of serial clock (SCK) phase and polarity
using two bits in the SPCON: the Clock POLarity (CPOL (1) ) and the Clock PHAse
(CPHA(1)). CPOL defines the default SCK line level in idle state. It has no significant
effect on the transmission format. CPHA defines the edges on which the input data are
sampled and the edges on which the output data are shifted (Figure 15 and Figure 16).
The clock phase and polarity should be identical for the Master SPI device and the communicating Slave device.
Figure 4. Data Transmission Format (CPHA = 0)
SCK Cycle Number
1
2
3
4
5
6
7
8
MSB
bit6
bit5
bit4
bit3
bit2
bit1
LSB
bit6
bit5
bit4
bit3
bit2
bit1
LSB
SPEN (Internal)
SCK (CPOL = 0)
SCK (CPOL = 1)
MOSI (from Master)
MISO (from Slave)
MSB
SS (to Slave)
Capture Point
1.
37
Before writing to the CPOL and CPHA bits, the SPI should be disabled (SPEN = ’0’).
AT8xC5112
4191C–8051–02/08
AT8xC5112
Figure 16 shows an SPI transmission in which CPHA is ’1’. In this case, the Master
begins driving its MOSI pin on the first SCK edge. Therefore the Slave uses the first
SCK edge as a start transmission signal. The SS pin can remain low between transmissions (Figure 17). This format may be preferable in systems having only one Master and
only one Slave driving the MISO data line.
Figure 5. Data Transmission Format (CPHA = 1)
1
2
3
4
5
6
7
8
MOSI (from Master)
MSB
bit6
bit5
bit4
bit3
bit2
bit1
LSB
MISO (from Slave)
MSB
bit6
bit5
bit4
bit3
bit2
bit1
SCK Cycle Number
SPEN (Internal)
SCK (CPOL = 0)
SCK (CPOL = 1)
LSB
SS (to Slave)
Capture Point
Figure 15 shows the first SCK edge is the MSB capture strobe. Therefore, the Slave
must begin driving its data before the first SCK edge, and a falling edge on the SS pin is
used to start the transmission. The SS pin must be toggled high and then low between
each byte transmitted (Figure 17).
Figure 6. CPHA/SS Timing
MISO/MOSI
Byte 1
Byte 2
Byte 3
Master SS
Slave SS
(CPHA = 0)
Slave SS
(CPHA = 1)
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4191C–8051–02/08
Error Conditions
The following flags in the SPSTA signal SPI error conditions:
Mode Fault (MODF)
Mode Fault error in Master mode SPI indicates that the level on the Slave Select (SS)
pin is inconsistent with the actual mode of the device. MODF is set to warn that there
may be a multi-master conflict for system control. In this case, the SPI system is
affected in the following ways:
•
An SPI receiver/error CPU interrupt request is generated.
•
The SPEN bit in SPCON is cleared. This disables the SPI.
•
The MSTR bit in SPCON is cleared.
The MODF flag is set when the SS signal becomes ’0’.
However, as stated before, for a system with one Master, if the SS pin of the Master
device is pulled low, there is no way that another Master is attempting to drive the network. In this case, clearing the MODF bit is accomplished by a read of SPSTA register
with MODF bit set, followed by a write to the SPCON register. SPEN Control bit may be
restored to its original set state after the MODF bit has been cleared.
Write Collision (WCOL)
A Write Collision (WCOL) flag in the SPSTA is set when a write to the SPDAT register is
done during a transmit sequence.
WCOL does not cause an interruption, and the transfer continues uninterrupted.
Clearing the WCOL bit is done through a software sequence of an access to SPSTA
and an access to SPDAT.
Overrun Condition
An overrun condition occurs when the Master device tries to send several data bytes
and the Slave device has not cleared the SPIF bit issuing from the previous data byte
transmitted. In this case, the receiver buffer contains the byte sent after the SPIF bit was
last cleared. A read of the SPDAT returns this byte. All others bytes are lost.
This condition is not detected by the SPI peripheral.
Interrupts
Two SPI status flags can generate a CPU interrupt request:
Table 2. SPI Interrupts
Flag
Request
SPIF (SP data transfer)
SPI Transmitter Interrupt request
MODF (Mode Fault)
SPI Receiver/Error Interrupt Request (if SSDIS = ’0’)
Serial Peripheral data transfer flag, SPIF: This bit is set by hardware when a transfer
has been completed. SPIF bit generates transmitter CPU interrupt requests.
Mode Fault flag, MODF: This bit becomes set to indicate that the level on the SS is
inconsistent with the mode of the SPI. MODF generates receiver/error CPU interrupt
requests.
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4191C–8051–02/08
AT8xC5112
Figure 18 gives a logical view of the above statements.
Figure 7. SPI Interrupt Requests Generation
SPIF
SPI Transmitter
CPU Interrupt Request
MODF
SPI
CPU Interrupt Request
SPI Receiver/Error
CPU Interrupt Request
SSDIS
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4191C–8051–02/08
Registers
There are three registers in the module that provide control, status and data storage
functions. These registers are described in the following paragraphs.
Serial Peripheral Control
Register (SPCON)
The Serial Peripheral Control Register does the following:
•
Selects one of the Master clock rates
•
Selects serial clock polarity and phase
•
Enables the SPI module
Table 30 describes this register and explains the use of each bit:
Table 3. Serial Peripheral Control Register
7
6
5
4
3
2
1
0
SPR2
SPEN
–
–
CPOL
CPHA
SPR1
SPR0
Bit
Number
Bit
Mnemonic
R/W Mode
Description
7
SPR2
RW
6
SPEN
RW
Serial Peripheral Rate 2
Bit with SPR1 and SPR0 define the clock rate
Serial Peripheral Enable
Clear to disable the SPI interface
Set to enable the SPI interface
5
-
RW
4
-
RW
3
CPOL
RW
Reserved
Leave this Bit at 0.
Reserved
Leave this Bit at 1.
Clock Polarity
Clear to have the SCK set to ’0’ in idle state
Set to have the SCK set to ’1’ in idle low
Clock Phase
2
CPHA
RW
Clear to have the data sampled when the SPSCK leaves the idle
state (see CPOL)
Set to have the data sampled when the SPSCK returns to idle
state (see CPOL)
Serial Peripheral Rate (SPR2:SPR1:SPR0)
000: FCkIdle /2
1
SPR1
RW
001: FCkIdle /4
010: FCkIdle /8
011: FCkIdle /16
100: FCkIdle /32
0
SPR0
RW
101: FCkIdle /64
110: FCkIdle /128
111: External clock, output of BRG
Reset value = 00010100b
41
AT8xC5112
4191C–8051–02/08
AT8xC5112
Serial Peripheral Status Register
(SPSTA)
The Serial Peripheral Status Register contains flags to signal the following conditions.
•
Data transfer complete
•
Write collision
•
Inconsistent logic level on SS pin (mode fault error)
Table 31 describes the SPSTA register and explains the use of every bit in the register:
Table 4. Serial Peripheral Status and Control Register
7
6
5
4
3
2
1
0
SPIF
WCOL
-
MODF
-
-
-
-
Bit
Number
Bit
Mnemonic
R/W
Mode
Description
Serial Peripheral data transfer flag
7
SPIF
R
Cleared by hardware to indicate data that transfer is in progress or has
been approved by a clearing sequence.
Set by hardware to indicate that the data transfer has been completed.
Write Collision flag
6
WCOL
R
Cleared by hardware to indicate that no collision has occurred or has
been approved by a clearing sequence.
Set by hardware to indicate that a collision has been detected.
5
-
RW
Reserved
The value read from this bit is indeterminate. Do not set this bit
Mode Fault
4
MODF
R
Cleared by hardware to indicate that the SS pin is at appropriate logic
level, or has been approved by a clearing sequence.
Set by hardware to indicate that the SS pin is at inappropriate logic
level
3
-
RW
2
-
RW
1
-
RW
0
-
RW
Reserved
The value read from this bit is indeterminate. Do not set this bit
Reserved
The value read from this bit is indeterminate. Do not set this bit
Reserved
The value read from this bit is indeterminate. Do not set this bit
Reserved
The value read from this bit is indeterminate. Do not set this bit
Reset value = 00X0XXXXb
42
4191C–8051–02/08
Serial Peripheral Data Register
(SPDAT)
The Serial Peripheral Data Register (Table 32) is a read/write buffer for the receive data
register. A write to SPDAT places data directly into the shift register. No transmit buffer
is available in this model.
A Read of the SPDAT returns the value located in the receive buffer and not the content
of the shift register.
Table 5. Serial Peripheral Data Register
7
6
5
4
3
2
1
0
R7
R6
R5
R4
R3
R2
R1
R0
Reset value = XXXX XXXXb
R7:R0: Receive data bits
SPCON, SPSTA and SPDAT registers may be read and written at any time while there
is no on-going exchange. However, special care should be taken when writing to them
while a transmission is on-going:
43
•
Do not change SPR2, SPR1 and SPR0
•
Do not change CPHA and CPOL
•
Do not change MSTR
•
Clearing SPEN would immediately disable the peripheral
•
Writing to the SPDAT will cause an overflow
AT8xC5112
4191C–8051–02/08
AT8xC5112
Analog-to-Digital
Converter (ADC)
This section describes the on-chip 10-bit analog-to-digital converter of the
T89C51RB2/RC2. Eight ADC channels are available for sampling of the external
sources AN0 to AN7. An analog multiplexer allows the single ADC to select one of the 8
ADC channels as ADC input voltage (ADCIN). ADCIN is converted by the 10 bit-cascaded potentiometric ADC.
Three kind of conversions are available:
•
Standard conversion (7-8 bits).
•
Precision conversion (8-9 bits).
•
Accurate conversion (10 bits).
For the precision conversion, set bits PSIDLE and ADSST in ADCON register to start
the conversion. The chip is in a pseudo-idle mode, the CPU doesn’t run but the peripherals are always running. This mode allows digital noise to be lower, to ensure precise
conversion.
For the accurate conversion, set bits QUIETM and ADSST in ADCON register to start
the conversion. The chip is in a quiet mode, the AD is the only peripheral running. This
mode allows digital noise to be as low as possible, to ensure high precision conversion.
For these modes it is necessary to work with end of conversion interrupt, which is the
only way to wake up the chip.
If another interrupt occurs during the precision conversion, it will be treated only after
this conversion is ended.
Features
ADC I/O Functions
•
8 channels with multiplexed inputs
•
10-bit cascaded potentiometric ADC
•
Conversion time down to 10 micro-seconds
•
Zero Error (offset) ± 2 LSB max
•
External Positive Reference Voltage Range 2.4 to VCC
•
ADCIN Range 0 to VCC
•
Integral non-linearity typical 1 LSB, max. 2 LSB (with 0.9*VCC<VREF<VCC)
•
Differential non-linearity typical 0.5 LSB, max. 1 LSB (with 0.9*VCC<VREF<VCC)
•
Conversion Complete Flag or Conversion Complete Interrupt
•
Selected ADC Clock
AINx are general I/Os that are shared with the ADC channels. The channel select bits in
ADCF register define which ADC channel pin will be used as ADCIN. The remaining
ADC channels pins can be used as general purpose I/Os or as the alternate function
that is available. Writes to the port register which aren’t selected by the ADCF will not
have any effect.
54
4191C–8051–02/08
Figure 1. ADC Description
ADCON.5
ADCON.3
ADEN
ADSST
ADC
Interrupt
Request
ADCON.4
ADEOC
CONTROL
CONV_CK
EADC
AIN0/P4.0
000
AIN1/P4.1
001
AIN2/P4.2
010
AIN3/P4.3
011
AIN4/P4.4
100
AIN5/P4.5
101
AIN6/P4.6
110
AIN7/P4.7
111
IE1.1
ADCIN
8
ADDH
2
ADDL
+
SAR
-
AVSS
Sample and Hold
10
R/2R DAC
VAGND
ADCON.5
SCH2
SCH1
SCH0
ADCON.2
ADCON.1
ADCON.0
ADEN
Vref
VADREF
Figure 26 shows the timing diagram of a complete conversion. For simplicity, the figure
depicts the waveforms in idealized form and does not provide precise timing information. For ADC characteristics and timing parameters refer to the Section “AC
Characteristics” of the AT8xC5112 datasheet.
Figure 2. Timing Diagram
CONV_CK
ADEN
TSETUP
ADSST
TCONV
ADEOC
Note:
55
Tsetup = 4 µs
AT8xC5112
4191C–8051–02/08
AT8xC5112
ADC Operation
Before starting a conversion, the A/D converter must be enabled, by setting the ADEN
bit, for at least Tsetup (four microseconds).
A start of single A/D conversion is triggered by setting bit ADSST (ADCON.3).
From the ADSST set, the first full CONV_CK period will be the sampling period for the
ADC; during this period, the switch is closed and the capacitor is being charged. At the
end of the first period, the switch opens and the capacitor is no longer being charged.
During the next 10 CONV_CK periods, the sample and hold will be in hold mode during
the conversion. The busy flag ADSST(ADCON.3) remains set as long as an A/D conversion is running. After completion of the A/D conversion, it is cleared by hardware. When
a conversion is running, this flag can be read only, a write has no effect.
The end-of-conversion flag ADEOC (ADCON.4) is set when the value of conversion is
available in ADDH and ADDL, it is cleared by software. If the bit EADC (IE1.1) is set, an
interrupt occur when flag ADEOC is set (see Figure 28). Clear this flag for re-arming the
interrupt.
From this point, if you keep starting a new conversion by resetting ADSST without
changing ADEN, it is not necessary to wait Tsetup.
The bits SCH0 to SCH2 in ADCON register are used for the analog input channel
selection.
Before starting normal power reduction modes the ADC conversion has to be completed.
Table 1. Selected Analog Input
Voltage Conversion
SCH2
SCH1
SCH0
Selected Analog Input
0
0
0
AN0
0
0
1
AN1
0
1
0
AN2
0
1
1
AN3
1
0
0
AN4
1
0
1
AN5
1
1
0
AN6
1
1
1
AN7
When the ADCIN is equal to VAREF, the ADC converts the signal to 3FFh (full scale). If
the input voltage equals VAGND, the ADC converts it to 000h. Input voltage between
VAREF and VAGND are a straight-line linear conversion. All other voltages will result in
3FFh if greater than VAREF and 000h if less than VAGND.
Note that ADCIN should not exceed VAREF absolute maximum range.
56
4191C–8051–02/08
Clock Selection
The maximum clock frequency for ADC (CONV_CK for Conversion Clock) is defined in
the AC characteristics section. A prescaler is featured (ADCCLK) to generate the
CONV_CK clock from the oscillator frequency.
Figure 3. A/D Converter Clock
CONV_CK
CKADC
/2
Prescaler ADCLK
A/D
Converter
The conversion frequency CONV_CK is derived from the oscillator frequency with the
following formulas:
FCkAdc = FOscOut/(512 - 2*CKRL) , if X2 = 0
= FOscOut
, if X2 = 1
and
FCONV_CK = FCkAdc/(2*PRS), if PRS > 0
FCONV_CK = FCkAdc/256, if PRS = 0
Some examples can be found in the table below:
ADC Standby Mode
FOscOut
FCkAdc
FCONV_CK
MHz
X2
CKRL
Mhz
ADCLK
khz
Conversion
time µs
16
0
FF
8
12
333
33
16
1
NA
16
32
250
44
When the ADC is not used, it is possible to set it in standby mode by clearing bit ADEN
in ADCON register.
In this mode the power dissipation is about 1 µW.
Voltage Reference
The Vref pin is used to enter the voltage reference for the A/D conversion.
Best accuracy is obtained with 0.9 VCC < VREF < VCC.
IT ADC Management
An interrupt end-of-conversion will occur when the bit ADEOC is activated and the bit
EADC is set. To re-arm the interrupt the bit ADEOC must be cleared by software.
Figure 4. ADC Interrupt Structure
ADCI
ADEOC
ADCON.2
EADC
IE1.1
57
AT8xC5112
4191C–8051–02/08
AT8xC5112
Registers
Table 2. ADCON Register
ADCON (S:F3h)
ADC Control Register
7
6
5
4
3
2
1
0
QUIETM
PSIDLE
ADEN
ADEOC
ADSST
SCH2
SCH1
SCH0
Bit Number
Bit Mnemonic
Description
7
QUIETM
Pseudo Idle mode (best precision)
Set to put in quiet mode during conversion.
Cleared by hardware after completion of the conversion.
6
PSIDLE
Pseudo Idle mode (good precision)
Set to put in idle mode during conversion.
Cleared by hardware after completion of the conversion.
5
ADEN
Enable/Standby Mode
Set to enable ADC.
Clear for Standby mode (power dissipation 1 µW).
4
ADEOC
End Of Conversion
Set by hardware when ADC result is ready to be read. This flag can
generate an interrupt.
Must be cleared by software.
3
ADSST
Start and Status
Set to start an A/D conversion.
Cleared by hardware after completion of the conversion.
2-0
SCH2:0
Selection of channel to convert
See Table 41.
Reset value = X000 0000b
Table 3. ADCLK Register
ADCLK (S:F2h)
ADC Clock Prescaler
7
6
5
4
3
2
1
0
-
PRS 6
PRS 5
PRS 4
PRS 3
PRS 2
PRS 1
PRS 0
Bit Number
Bit Mnemonic
7
–
6-0
PRS6:0
Description
Reserved
Leave this bit at 0.
Clock Prescaler
fCONV_CK = fCkADC/(2 * PRS)
if PRS = 0, fCONV_CK = fCkADC/256
Reset value = 0000 0000b
58
4191C–8051–02/08
Table 4. ADDH Register
ADDH (S:F5h Read Only)
ADC Data High byte register
7
6
5
4
3
2
1
0
ADAT 9
ADAT 8
ADAT 7
ADAT 6
ADAT 5
ADAT 4
ADAT 3
ADAT 2
Bit Number
Bit Mnemonic Description
7-0
ADC result
Bits 9 - 2
ADAT9:2
Read only register
Reset value = 00h
Table 5. ADDL Register
ADDL (S:F4h Read Only)
ADC Data Low byte register
7
6
5
4
3
2
1
0
-
-
-
-
-
-
ADAT 1
ADAT 0
Bit Number
Bit Mnemonic
7-6
-
1-0
ADAT1:0
Description
Reserved
The value read from these bits are indeterminate. Do not set these bits.
ADC result
Bits 1 - 0
Read only register
Reset value = xxxx xx00b
Table 6. ADCF Register
ADCF (S:F6h)
ADC Input Select Register
7
6
5
4
3
2
1
0
SEL7
SEL6
SEL5
SEL4
SEL3
SEL2
SEL1
SEL0
Bit Number Bit Mnemonic Description
7-0
59
SEL7 - 0
Select Input 7 - 0
Set to select bit 7 - 0 as possible input for A/D
Cleared to leave this bit free for other function
AT8xC5112
4191C–8051–02/08
AT8xC5112
Programmable
Counter Array (PCA)
The PCA provides more timing capabilities with less CPU intervention than the standard
timer/counters. Its advantages include reduced software overhead and improved accuracy. The PCA consists of a dedicated timer/counter which serves as the time base for
an array of five compare/capture modules. Its clock input can be programmed to count
any one of the following signals:
•
Oscillator frequency ÷ 12 (÷ 6 in X2 mode)
•
Oscillator frequency ÷ 4 (÷ 2 in X2 mode)
•
Timer 0 overflow
•
External input on ECI (P1.2)
Each compare/capture modules can be programmed in any one of the following modes:
•
rising and/or falling edge capture
•
software timer
•
high-speed output
•
pulse width modulator
Module 4 can also be programmed as a watchdog timer (see Section "PCA PWM
Mode", page 53).
When the compare/capture modules are programmed in the capture mode, software
timer, or high-speed output mode, an interrupt can be generated when the module executes its function. All five modules plus the PCA timer overflow share one interrupt
vector.
The PCA timer/counter and compare/capture modules share Port 1 for external I/O.
These pins are listed below. If the port is not used for the PCA, it can still be used for
standard I/O.
PCA Component
External I/O Pin
16-bit Counter
P1.2/ECI
16-bit Module 0
P1.3/CEX0
16-bit Module 1
P1.4/CEX1
16-bit Module 2
P1.5/CEX2
16-bit Module 3
P1.6/CEX3
16-bit Module 4
P1.7/CEX4
The PCA timer is a common time base for all five modules (see Figure 19). The timer
count source is determined from the CPS1 and CPS0 bits in the CMOD SFR (see
Table 33) and can be programmed to run at:
•
1/12 the oscillator frequency. (Or 1/6 in X2 Mode).
•
1/4 the oscillator frequency. (Or 1/2 in X2 Mode).
•
The Timer 0 overflow.
•
The input on the ECI pin (P1.2).
44
4191C–8051–02/08
Figure 1. PCA Timer/Counter
To PCA
Modules
Fosc /12
overflow
Fosc/4
CH
T0 OVF
It
CL
16-bit Up/Down Counter
P1.2
CIDL
WDTE
CF
CR
CPS1 CPS0
ECF
CMOD
0xD9
CCF2 CCF1
CCF0
CCON
0xD8
Idle
CCF4 CCF3
Table 1. CMOD: PCA Counter Mode Register - CMOD Address 0D9H
7
6
5
4
3
2
1
0
CIDL
WDTE
-
-
-
CPS1
CPS0
ECF
Bit
Number
Bit
Mnemonic
7
CIDL
6
WDTE
5
-
Not implemented, reserved for future use. (1)
4
-
Not implemented, reserved for future use.
3
-
Not implemented, reserved for future use.
Description
Counter Idle control:
CIDL = 0 programs the PCA Counter to continue functioning during idle Mode.
CIDL = 1 programs it to be gated off during idle.
Watchdog Timer Enable:
WDTE = 0 disables Watchdog Timer function on PCA Module 4. WDTE = 1
enables it.
CPS1
2
CPS1
1
CPS0
0
ECF
CPS0
Selected PCA input (2)
0
0
Internal clock fosc/12 ( Or fosc/6 in X2 Mode).
0
1
Internal clock fosc/4 ( Or fosc/2 in X2 Mode).
1
0
Timer 0 Overflow
1
1
External clock at ECI/P1.2 pin (max rate = fosc/ 8)
PCA Count Pulse Select bit 0.
PCA Enable Counter Overflow interrupt: ECF = 1 enables CF bit in CCON to
generate an interrupt. ECF = 0 disables that function of CF.
Reset value = 00XXX00
1.
2.
45
User software should not write 1s to reserved bits. These bits may be used in future 8051
family products to invoke new features. In that case, the reset or inactive value of the
new bit will be 0, and its active value will be 1.The value read from a reserved bit is
indeterminate.
fosc = oscillator frequency
AT8xC5112
4191C–8051–02/08
AT8xC5112
The CMOD SFR includes three additional bits associated with the PCA (See Figure 19
and Table 33).
•
The CIDL bit which allows the PCA to stop during idle mode.
•
The WDTE bit which enables or disables the watchdog function on module 4.
•
The ECF bit which when set causes an interrupt and the PCA overflow flag CF (in
the CCON SFR) to be set when the PCA timer overflows.
The CCON SFR contains the run control bit for the PCA and the flags for the PCA timer
(CF) and each module (see Table 34).
•
Bit CR (CCON.6) must be set by software to run the PCA. The PCA is shut off by
clearing this bit.
•
Bit CF: The CF bit (CCON.7) is set when the PCA counter overflows and an
interrupt will be generated if the ECF bit in the CMOD register is set. The CF bit can
only be cleared by software.
•
Bits 0 through 4 are the flags for the modules (bit 0 for module 0, bit 1 for module 1,
etc.) and are set by hardware when either a match or a capture occurs. These flags
also can only be cleared by software.
Table 2. CCON: PCA Counter Control Register
CCON Address OD8H
7
6
5
4
3
2
1
0
CF
CR
-
CCF4
CCF3
CCF2
CCF1
CCF0
Bit
Number
1.
Bit
Mnemonic Description
7
CF
PCA Counter Overflow flag. Set by hardware when the counter rolls over. CF flags
an interrupt if bit ECF in CMOD is set. CF may be set by either hardware or
software but can only be cleared by software.
6
CR
PCA Counter Run control bit. Set by software to turn the PCA counter on. Must be
cleared by software to turn the PCA counter off.
5
-
4
CCF4
PCA Module 4 interrupt flag. Set by hardware when a match or capture occurs.
Must be cleared by software.
3
CCF3
PCA Module 3 interrupt flag. Set by hardware when a match or capture occurs.
Must be cleared by software.
2
CCF2
PCA Module 2 interrupt flag. Set by hardware when a match or capture occurs.
Must be cleared by software.
1
CCF1
PCA Module 1 interrupt flag. Set by hardware when a match or capture occurs.
Must be cleared by software.
0
CCF0
PCA Module 0 interrupt flag. Set by hardware when a match or capture occurs.
Must be cleared by software.
Not implemented, reserved for future use (1).
User software should not write 1s to reserved bits. These bits may be used in future 8051
family products to invoke new features. In that case, the reset or inactive value of the
new bit will be 0, and its active value will be 1. The value read from a reserved bit is
indeterminate.
The watchdog timer function is implemented in module 4 (see Figure 22).
46
4191C–8051–02/08
The PCA interrupt system is shown in Figure 20 below.
Figure 2. PCA Interrupt System
CF
CR
CCF4 CCF3 CCF2 CCF1 CCF0
CCON
0xD8
PCA Timer/Counter
Module 0
Module 1
To Interrupt
priority decoder
Module 2
Module 3
Module 4
CMOD.0
ECF
ECCFn CCAPMn.0
IE.6
EC
IE.7
EA
PCA Modules: each one of the five compare/capture modules has six possible functions. It can perform:
•
16-bit Capture, positive-edge triggered
•
16-bit Capture, negative-edge triggered
•
16-bit Capture, both positive and negative-edge triggered
•
16-bit Software Timer
•
16-bit High-speed Output
•
8-bit Pulse Width Modulator
In addition, module 4 can be used as a Watchdog Timer.
Each module in the PCA has a special function register associated with it. These registers are: CCAPM0 for module 0, CCAPM1 for module 1, etc. (see Table 35). The
registers contain the bits that control the mode that each module will operate in.
47
•
The ECCF bit (CCAPMn.0 where n = 0, 1, 2, 3, or 4 depending on the module)
enables the CCF flag in the CCON SFR to generate an interrupt when a match or
compare occurs in the associated module.
•
PWM (CCAPMn.1) enables the pulse width modulation mode.
•
The TOG bit (CCAPMn.2) when set causes the CEX output associated with the
module to toggle when there is a match between the PCA counter and the module's
capture/compare register.
•
The match bit MAT (CCAPMn.3) when set will cause the CCFn bit in the CCON
register to be set when there is a match between the PCA counter and the module's
capture/compare register.
•
The next two bits CAPN (CCAPMn.4) and CAPP (CCAPMn.5) determine the edge
that a capture input will be active on. The CAPN bit enables the negative edge, and
the CAPP bit enables the positive edge. If both bits are set both edges will be
enabled and a capture will occur for either transition.
AT8xC5112
4191C–8051–02/08
AT8xC5112
•
The last bit in the register ECOM (CCAPMn.6) when set enables the comparator
function.
Table 35 shows the CCAPMn settings for the various PCA functions.
Table 3. CCAPMn: PCA Modules Compare/Capture Control Registers
CAPMn Address n = 0 - 4
7
6
5
4
3
2
1
0
-
ECOMn
CAPPn
CAPn
MATn
TOGn
PWMm
ECCFn
Bit
Number
Bit
Mnemonic
7
-
6
ECOMn
Enable Comparator. ECOMn = 1 enables the comparator function.
5
CAPPn
Capture Positive, CAPPn = 1 enables positive edge capture.
4
CAPNn
Capture Negative, CAPNn = 1 enables negative edge capture.
3
MATn
Match. When MATn = 1, a match of the PCA counter with this module's
compare/capture register causes the CCFn bit in CCON to be set, flagging an
interrupt.
2
TOGn
Toggle. When TOGn = 1, a match of the PCA counter with this module's
compare/capture register causes the CEXn pin to toggle.
1
PWMn
Pulse Width Modulation Mode. PWMn = 1 enables the CEXn pin to be used as a
pulse width modulated output.
0
ECCFn
Enable CCF interrupt. Enables compare/capture flag CCFn in the CCON register
to generate an interrupt.
Description
Not implemented, reserved for future use. (1)
Reset value = X000000
1.
User software should not write 1s to reserved bits. These bits may be used in future 8051
family products to invoke new features. In that case, the reset or inactive value of the
new bit will be 0, and its active value will be 1. The value read from a reserved bit is
indeterminate.
Table 4. PCA Module Modes (CCAPMn Registers)
ECOMn CAPPn
CAPNn
MATn
TOGn
PWMm
ECCFn Module Function
0
0
0
0
0
0
0
No Operation
X
1
0
0
0
0
X
16-bit capture by a positive-edge
trigger on CEXn
X
0
1
0
0
0
X
16-bit capture by a negative trigger
on CEXn
X
1
1
0
0
0
X
16-bit capture by a transition on
CEXn
1
0
0
1
0
0
X
16-bit Software Timer/Compare
mode.
1
0
0
1
1
0
X
16-bit High-speed Output
1
0
0
0
0
1
0
8-bit PWM
1
0
0
1
X
0
X
Watchdog Timer (module 4 only)
48
4191C–8051–02/08
There are two additional registers associated with each of the PCA modules. They are
CCAPnH and CCAPnL and these are the registers that store the 16-bit count when a
capture occurs or a compare should occur. When a module is used in the PWM mode
these registers are used to control the duty cycle of the output (See Table 37 &
Table 38)
Table 5. CCAPnH: PCA Modules Capture/Compare Registers High
CCAPnH Address
n=0-4
CCAP0H = 0FAH
CCAP1H = 0FBH
CCAP2H = 0FCH
CCAP3H = 0FDH
CCAP4H = 0FEH
Reset value
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
Table 6. CCAPnL: PCA Modules Capture/Compare Registers Low
CCAPnL Address
n=0-4
CCAP0L = 0EAH
CCAP1L = 0EBH
CCAP2L = 0ECH
CCAP3L = 0EDH
CCAP4L = 0EEH
Reset value
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
Table 7. CH: PCA Counter High
CH
Address 0F9H
Reset value
Table 8. CL: PCA Counter Low
CL
Address 0E9H
Reset value
49
AT8xC5112
4191C–8051–02/08
AT8xC5112
PCA Capture Mode
To use one of the PCA modules in the capture mode either one or both of the CCAPM
bits CAPN and CAPP for that module must be set. The external CEX input for the module (on port 1) is sampled for a transition. When a valid transition occurs the PCA
hardware loads the value of the PCA counter registers (CH and CL) into the module's
capture registers (CCAPnL and CCAPnH). If the CCFn bit for the module in the CCON
SFR and the ECCFn bit in the CCAPMn SFR are set then an interrupt will be generated
(see Figure 21).
Figure 3. PCA Capture Mode
CF
CR
CCF4 CCF3 CCF2 CCF1 CCF0 CCON
0xD8
PCA IT
PCA Counter/Timer
Cex.n
CH
CL
CCAPnH
CCAPnL
Capture
ECOMn CAPPn CAPNn MATn TOGn PWMn ECCFn CCAPMn, n = 0 to 4
0xDA to 0xDE
50
4191C–8051–02/08
16-bit Software Timer/
Compare Mode
The PCA modules can be used as software timers by setting both the ECOM and MAT
bits in the modules CCAPMn register. The PCA timer will be compared to the module's
capture registers and when a match occurs an interrupt will occur if the CCFn (CCON
SFR) and the ECCFn (CCAPMn SFR) bits for the module are both set (See Figure 22).
Figure 4. PCA Compare Mode and PCA Watchdog Timer
CCON
CF
Write to
CCAPnL
CR
CCF4 CCF3 CCF2 CCF1 CCF0
0xD8
Reset
PCA IT
Write to
CCAPnH
1
CCAPnH
0
CCAPnL
Enable
Match
16-bit Comparator
CH
RESET (1)
CL
PCA Counter/Timer
ECOMn CAPPn CAPNn MATn TOGn PWMn ECCFn
CIDL
Note:
WDTE
CPS1 CPS0
ECF
CCAPMn, n = 0 to 4
0xDA to 0xDE
CMOD
0xD9
1. Only for Module 4
Before enabling ECOM bit, CCAPnL and CCAPnH should be set with a non zero value,
otherwise an unwanted match could occur. Writing to CCAPnH will set the ECOM bit.
Once ECOM is set, writing CCAPnL will clear ECOM so that an unwanted match doesn’t
occur while modifying the compare value. Writing to CCAPnH will set ECOM. For this
reason, user software should write CCAPnL first, and then CCAPnH. Of course, the
ECOM bit can still be controlled by accessing to CCAPMn register.
51
AT8xC5112
4191C–8051–02/08
AT8xC5112
High-speed Output Mode In this mode the CEX output (on port 1) associated with the PCA module will toggle
each time a match occurs between the PCA counter and the module's capture registers.
To activate this mode the TOG, MAT, and ECOM bits in the module's CCAPMn SFR
must be set (see Figure 23).
A prior write must be done to CCAPnL and CCAPnH before writing the ECOMn bit.
Figure 5. PCA High-speed Output Mode
CCON
CF
CR
CCF4 CCF3 CCF2 CCF1 CCF0
0xD8
Write to
CCAPnL Reset
PCA IT
Write to
CCAPnH
1
CCAPnH
0
CCAPnL
Enable
16-bit Comparator
CH
Match
CEXn
CL
PCA Counter/Timer
ECOMn CAPPn CAPNn
MATn
TOGn
PWMn ECCFn
CCAPMn, n = 0 to 4
0xDA to 0xDE
Before enabling ECOM bit, CCAPnL and CCAPnH should be set with a non zero value,
otherwise an unwanted match could happen.
Once ECOM is set, writing CCAPnL will clear ECOM so that an unwanted match doesn’t
occur while modifying the compare value. Writing to CCAPnH will set ECOM. For this
reason, user software should write CCAPnL first, and then CCAPnH. Of course, the
ECOM bit can still be controlled by accessing to CCAPMn register.
Pulse Width Modulator
Mode
All of the PCA modules can be used as PWM outputs. Figure 24 shows the PWM function. The frequency of the output depends on the source for the PCA timer. All of the
modules will have the same frequency of output because they all share the PCA timer.
The duty cycle of each module is independently variable using the module's capture
register CCAPLn. When the value of the PCA CL SFR is less than the value in the module's CCAPLn SFR the output will be low, when it is equal to or greater than, the output
will be high. When CL overflows from FF to 00, CCAPLn is reloaded with the value in
CCAPHn. This allows updating the PWM without glitches. The PWM and ECOM bits in
the module's CCAPMn register must be set to enable the PWM mode.
52
4191C–8051–02/08
Figure 6. PCA PWM Mode
CCAPnH
Overflow
CCAPnL
“0”
Enable
8-bit Comparator
CEXn
<
>
“1”
CL
PCA Counter/Timer
ECOMn CAPPn CAPNn
MATn
TOGn
PWMn ECCFn
CCAPMn, n = 0 to 4
0xDA to 0xDE
An on-board watchdog timer is available with the PCA to improve the reliability of the
system without increasing chip count. Watchdog timers are useful for systems that are
susceptible to noise, power glitches, or electrostatic discharge. Module 4 is the only
PCA module that can be programmed as a watchdog. However, this module can still be
used for other modes if the watchdog is not needed. Figure 22 shows a diagram of how
the watchdog works. The user pre-loads a 16-bit value in the compare registers. Just
like the other compare modes, this 16-bit value is compared to the PCA timer value. If a
match is allowed to occur, an internal reset will be generated. This will not cause the
RST pin to be driven high.
In order to hold off the reset, the user has three options:
1. Periodically change the compare value so it will never match the PCA timer
2. Periodically change the PCA timer value so it will never match the compare values or
3. Disable the watchdog by clearing the WDTE bit before a match occurs and then
re-enable it
The first two options are more reliable because the watchdog timer is never disabled as
in option #3. If the program counter ever goes astray, a match will eventually occur and
cause an internal reset. The second option is also not recommended if other PCA modules are being used. Remember, the PCA timer is the time base for all modules;
changing the time base for other modules would not be a good idea. Thus, in most applications the first solution is the best option.
This watchdog timer won’t generate a reset out on the reset pin.
53
AT8xC5112
4191C–8051–02/08
AT8xC5112
ROM
ROM Structure
The T83C5112 ROM memory is divided in three different arrays:
•
the code array: 8K bytes
•
the encryption array: 64 bytes
•
the signature array: 4 bytes
ROM Lock System
The program Lock system, when programmed, protects the on-chip program against
software piracy.
Encryption Array
Within the ROM array are 64 bytes of encryption array. Every time a byte is addressed
during program verify, 6 address lines are used to select a byte of the encryption array.
This byte is then exclusive-NOR’ed (XNOR) with the code byte, creating an encrypted
verify byte. The algorithm, with the encryption array in the unprogrammed state, will
return the code in its original, unmodified form.
When using the encryption array, one important factor needs to be considered. If a byte
has the value FFh, verifying the byte will produce the encryption byte value. If a large
block (>64 bytes) of code is left unprogrammed, a verification routine will display the
content of the encryption array. For this reason all the unused code bytes should be programmed with random values.
Program Lock Bits
The lock bits when programmed according to Table 41. will provide different level of protection for the on-chip code and data.
Program Lock Bits
Security
level
LB1
LB2
1
U
U
No program lock features enabled. Code verify will still be encrypted by
the encryption array if programmed. MOVC instruction executed from
external program memory returns non encrypted data.
2
P
U
MOVC instruction executed from external program memory are disabled
from fetching code bytes from internal memory, EA is sampled and latched
on reset.
3
U
P
Protection Description
Same as 2, also verify is disabled
This security level is available because ROM integrity will be verified
thanks to another method.
U: unprogrammed
P: programmed
Signature Bytes
The T83C5112 contains 4 factory programmed signatures bytes. To read these bytes,
perform the process described in Section “Signature Bytes”, page 72.
Verify Algorithm
Refer to Section “Verify Algorithm”, page 74.
62
4191C–8051–02/08
AT8xC5112
Interrupt System
The AT8xC5112 has a total of 8 interrupt vectors: two external interrupts (INT0 and
INT1), two timer interrupts (timers 0, 1), serial port interrupt, PCA, SPI and A/D. These
interrupts are shown in Figure 29.
Figure 1. Interrupt Control System
High Priority
Interrupt
IPH, IP
3
INT0
IE0
0
3
TF0
0
Interrupt
Polling
Sequence
3
INT1
IE1
0
3
TF1
0
CF
3
PCA
0
CCFx
3
RI
TI
0
3
NC
0
3
SPI
0
3
ADC
0
Individual
Enable
Global
Disable
Low Priority
Interrupt
Each of the interrupt sources can be individually enabled or disabled by setting or clearing a bit in the Interrupt Enable register (See Table 49). This register also contains a
global disable bit, which must be cleared to disable all interrupts at once.
Each interrupt source can also be individually programmed to one of four priority levels
by setting or clearing a bit in the Interrupt Priority register (See Table 51) and in the
Interrupt Priority High register (see Table 53). Table 47 shows the bit values and priority
levels associated with each combination.
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4191C–8051–02/08
Table 1. Priority Bit Level Values
IPH.x
IP.x
Interrupt Level Priority
0
0
0 (Lowest)
0
1
1
1
0
2
1
1
3 (Highest)
A low-priority interrupt can be interrupted by a high priority interrupt, but not by another
low-priority interrupt. A high-priority interrupt can’t be interrupted by any other interrupt
source.
If two interrupt requests of different priority levels are received simultaneously, the
request of higher priority level is serviced. If interrupt requests of the same priority level
are received simultaneously, an internal polling sequence determines which request is
serviced. Thus within each priority level there is a second priority structure determined
by the polling sequence.
Table 2. Address Vectors
61
Interrupt Name
Interrupt Address Vector
Priority Number
External Interrupt (INT0)
0003h
1
Timer0 (TF0)
000Bh
2
External Interrupt (INT1)
0013h
3
Timer1 (TF1)
001Bh
4
PCA (CF or CCFn)
0033h
5
UART (RI or TI)
0023h
6
SPI
004Bh
8
ADC
0043h
9
AT8xC5112
4191C–8051–02/08
AT8xC5112
Table 3. IE0 Register
IE0 - Interrupt Enable Register (A8H)
7
6
5
4
3
2
1
0
EA
EC
-
ES
ET1
EX1
ET0
EX0
Bit
Number
Bit
Mnemonic
Description
7
EA
Enable All interrupt bit
Clear to disable all interrupts.
Set to enable all interrupts.
If EA = 1, each interrupt source is individually enabled or disabled by setting or
clearing its interrupt enable bit.
6
EC
PCA Interrupt Enable
Clear to disable the the PCA interrupt.
Set to enable the the PCA interrupt.
5
-
4
ES
Serial port Enable bit
Clear to disable serial port interrupt.
Set to enable serial port interrupt.
3
ET1
Timer 1 overflow interrupt Enable bit
Clear to disable timer 1 overflow interrupt.
Set to enable timer 1 overflow interrupt.
2
EX1
External interrupt 1 Enable bit
Clear to disable external interrupt 1.
Set to enable external interrupt 1.
1
ET0
Timer 0 overflow interrupt Enable bit
Clear to disable timer 0 overflow interrupt.
Set to enable timer 0 overflow interrupt.
0
EX0
External interrupt 0 Enable bit
Clear to disable external interrupt 0.
Set to enable external interrupt 0.
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Reset value = 00X0 0000b
Bit addressable
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4191C–8051–02/08
Table 4. IE1 Register
IE1 (S:B1H) - Interrupt Enable Register
7
6
5
4
3
2
1
0
-
-
-
-
-
ESPI
EADC
-
Bit
Number
Bit
Mnemonic Description
7
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
6
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
5
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
4
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
3
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
2
ESPI
SPI Interrupt Enable bit
Clear to disable the SPI interrupt.
Set to enable the SPI interrupt.
1
EADC
A/D Interrupt Enable bit
Clear to disable the ADC interrupt.
Set to enable the ADC interrupt.
0
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Reset value = XXXX X00Xb
No Bit addressable
63
AT8xC5112
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AT8xC5112
Table 5. IPL0 Register
IPL0 - Interrupt Priority Register (B8H)
7
6
5
4
3
2
1
0
-
PPC
-
PS
PT1
PX1
PT0
PX0
Bit
Number
Bit
Mnemonic
7
-
6
PPC
5
-
4
PS
Serial port Priority bit
Refer to PSH for priority level.
3
PT1
Timer 1 overflow interrupt Priority bit
Refer to PT1H for priority level.
2
PX1
External interrupt 1 Priority bit
Refer to PX1H for priority level.
1
PT0
Timer 0 overflow interrupt Priority bit
Refer to PT0H for priority level.
0
PX0
External interrupt 0 Priority bit
Refer to PX0H for priority level.
Description
Reserved
The value read from this bit is indeterminate. Do not set this bit.
PCA Counter Interrupt Priority bit
Refer to PPCH for priority level.
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Reset value = X0X0 0000b
Bit addressable.
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Table 6. IPL1 Register
IPL1 - Interrupt Priority Low Register 1 (S:B2H)
7
6
5
4
3
2
1
0
-
-
-
-
-
PSPI
PADC
-
Bit
Number
Bit
Mnemonic Description
Reserved
The value read from this bit is indeterminate. Do not set this bit.
7
-
6
-
5
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
4
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
3
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
2
PSPI
SPI Interrupt Priority level less significant bit.
Refer to PSPIH for priority level.
1
PADC
ADC Interrupt Priority level less significant bit.
Refer to PADCH for priority level.
0
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Reset value = XXXX X00Xb
Not Bit addressable.
65
AT8xC5112
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AT8xC5112
Table 7. IPH0 Register
IPH0 - Interrrupt Priority High Register
7
6
5
4
3
2
1
0
-
PPCH
-
PSH
PT1H
PX1H
PT0H
PX0H
Bit
Number
7
Bit
Mnemonic Description
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
PCA Counter Interrupt Priority level most significant bit
6
5
PPCH
-
PPCH
PPC
Priority Level
0
0
Lowest
0
1
1
1
0
1
Highest
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Serial port Priority High bit
PS Priority Level
PSH
4
PSH
0
0
0
1
1
1
0
1
Lowest
Highest
Timer 1 overflow interrupt Priority High bit
3
PT1H
PT1H
PT1
Priority Level
0
0
Lowest
0
1
1
1
0
1
Highest
External interrupt 1 Priority High bit
PX1
Priority Level
PX1H
2
PX1H
0
0
0
1
1
1
0
1
Lowest
Highest
Timer 0 overflow interrupt Priority High bit
1
PT0H
PT0H
PT0
Priority Level
0
0
Lowest
0
1
1
1
0
1
Highest
External interrupt 0 Priority High bit
0
PX0H
PX0H
PT0
Priority Level
0
0
Lowest
0
1
1
1
0
1
Highest
Reset value = X0X0 0000b
Not bit addressable
66
4191C–8051–02/08
Table 8. IPH1 Register
IPH1 - Interrupt High Register 1 (B3H)
7
6
5
4
3
2
1
0
-
-
-
-
-
PSPIH
PADCH
-
Bit
Number
Bit
Mnemonic Description
7
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
6
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
5
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
4
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
3
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
SPI Interrupt Priority level most significant bit
2
PSPIH
PSP1H
PSP1
Priority Level
0
0
Lowest
0
1
1
1
0
1
Highest
ADC Interrupt Priority level most significant bit
1
0
PADCH
-
PADCH
PADC
Priority Level
0
0
Lowest
0
1
1
1
0
1
Highest
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Reset value = XXXX X00Xb
Not bit addressable
67
AT8xC5112
4191C–8051–02/08
AT8xC5112
EPROM
EPROM Structure
The T87C5112 EPROM is divided into two different arrays:
•
the code array: 8K bytes
•
the encryption array: 64 bytes
In addition a third non programmable array is implemented:
•
the signature array: 4 bytes
EPROM Lock System
The program Lock system, when programmed, protects the on-chip program against
software piracy.
Encryption Array
Within the EPROM array are 64 bytes of encryption array that are initially unprogrammed (all FF’s). Every time a byte is addressed during program verify, 6 address
lines are used to select a byte of the encryption array. This byte is then exclusiveNOR’ed (XNOR) with the code byte, creating an encrypted verify byte. The algorithm,
with the encryption array in the unprogrammed state, will return the code in its original,
unmodified form.
When using the encryption array, one important factor needs to be considered. If a byte
has the value FFh, verifying the byte will produce the encryption byte value. If a large
block (>64 bytes) of code is left unprogrammed, a verification routine will display the
content of the encryption array. For this reason all the unused code bytes should be programmed with random values.
Program Lock Bits
The three lock bits located in the CONF byte, when programmed according to Table will
provide different levels of protection for the on-chip code and data.
Table 57. Program Lock Bits
Program Lock Bits
Security level
LB1
LB2
LB3
Protection Description
1
U
U
U
No program lock features enabled. Code verify will still be encrypted by the encryption
array if programmed. MOVC instruction executed from external program memory returns
non encrypted data.
2
P
U
U
MOVC instruction executed from external program memory are disabled from fetching
code bytes from internal memory, EA is sampled and latched on reset, and further
programming of the EPROM is disabled.
3
U
P
U
This security level is available because ROM integrity will be verified thanks to another
method.
4
U
U
P
Same as 3, also external execution is disabled.
Same as 2, also verify is disabled
U: unprogrammed
P: programmed
WARNING: Security level 2 and higher should only be programmed after EPROM verification.
71
4191C–8051–02/08
Configuration Byte
The configuration byte is a special register. Its content is defined by the diffusion mask
in the ROM version or is read or written by the OTP programmer in the OTP version.
This register can also be accessed as a read only register.
Table 58. CONF - Configuration Byte (EFh)
7
6
5
4
3
2
1
0
LB1
LB2
LB3
1
1
1
1
1
Bit Number
7:5
4
3
2
1
0
Bit Mnemonic Description
-
Program memory lock bits
See previous chapter for the definition of these bits.
-
Reserved
Leave this bit at 1.
-
Reserved
Leave this bit at 1.
-
Reserved
Leave this bit at 1.
-
Reserved
Leave this bit at 1.
-
Reserved
Leave this bit at 1.
Reset value = 1111 111X
Signature Bytes
The T87C5112 contains 4 factory programmed signatures bytes. To read these bytes,
perform the process described in Section .
EPROM Programming
Set-up Modes
In order to program and verify the EPROM or to read the signature bytes, the T87C5112
is placed in specific set-up modes (See Figure 30.).
Control and program signals must be held at the levels indicated in
Definition of Terms
Address Lines:P1.0-P1.7, P2.0-P2.5, P3.4, P3.5 respectively for A0-A15 (P2.5 (A13)
for RB, P3.4 (A14) for RC, P3.5 (A15) for RD)
Data Lines:P0.0-P0.7 for D0-D7
Control Signals:RST, PSEN, P2.6, P2.7, P3.3, P3.6, P3.7.
Program Signals:ALE/PROG, RST/VPP.
72
AT8xC5112
4191C–8051–02/08
AT8xC5112
Table 59. EPROM Set-up Modes
Mode
RST
PSEN
Program Code data
1
0
Verify Code data
1
0
Program Encryption Array Address 0-3Fh
1
0
Read Signature Bytes
1
0
Program Lock bit 1
1
Program Lock bit 2
ALE/PR
OG
RST/VPP
P2.6
P2.7
P3.3
P3.6
P3.7
12.75V
0
1
1
1
1
1
0
0
1
1
12.75V
0
1
0
1
1
0
0
0
0
0
12.75V
1
1
1
1
1
1
0
12.75V
1
1
1
0
0
Program Lock bit 3
1
0
12.75V
1
0
1
1
0
Program CONF byte
1
0
12.75V
1
0
1
0
0
Read CONF byte
1
0
1
0
0
0
1
1
1
1
1
Figure 30. Set-up Modes Configuration
+5V
PROGRAM
SIGNALS*
+5V
CONTROL
SIGNALS*
4 to 6 MHz
RST/VPP
VCC
ALE/PROG
EA
RST
PSEN
P2.6
P2.7
P3.3
P3.6
P3.7
P0.0-P0.7
D0-D7
P1.0-P1.7
A0-A7
A8-A15
P2.0-P2.5
P3.4-P3.5
XTAL1
VSS
GND
* See for proper value on these inputs
73
4191C–8051–02/08
Programming Algorithm
The Improved Quick Pulse algorithm is based on the Quick Pulse algorithm and
decreases the number of pulses applied during byte programming from 25 to 1.
To program the AT8xC5112 the following sequence must be exercised:
•
Step 1: Activate the combination of control signals.
•
Step 2: Input the valid address on the address lines.
•
Step 3: Input the appropriate data on the data lines.
•
Step 4: Raise RST/VPP from VCC to VPP (typical 12.75V).
•
Step 5: Pulse ALE/PROG once.
•
Step 6: Lower RST/VPP from VPP to VCC
Repeat step 2 through 6 changing the address and data for the entire array or until the
end of the object file is reached (See Figure 31).
Programming CONF Byte
After having apply the proper test mode, algorithm for programming CONF byte is similar to the previous programming algorithm with no address to present on the address
lines.
Verify Algorithm
Code array verify must be done after each byte or block of bytes is programmed. In
either case, a complete verify of the programmed array will ensure reliable programming
of the T87C5112.
P 2.7 is used to enable data output.
To verify the T87C5112 code the following sequence must be exercised:
•
Step 1: Activate the combination of program and control signals.
•
Step 2: Input the valid address on the address lines.
•
Step 3: Read data on the data lines.
Repeat step 2 through 3 changing the address for the entire array verification (See
Figure 31).
The encryption array cannot be directly verified. Verification of the encryption array is
done by observing that the code array is well encrypted.
Verify CONF Byte
After having apply the proper test mode, algorithm for read/verify CONF byte is similar
to the previous verify algorithm with no address to present on the address lines.
Figure 31. Programming and Verification Signal’s Waveform
Programming Cycle
Read/Verify Cycle
A0-A12
D0-D7
Data In
Data Out
100µs
ALE/PROG
RST/VPP
12.75V
5V
0V
Control
signals
74
AT8xC5112
4191C–8051–02/08
AT8xC5112
Signature Bytes
Signature Bytes Content
The T87C5112 has four signature bytes in location 30h, 31h, 60h and 61h. To read
these bytes follow the procedure for EPROM verify but activate the control lines provided in xxxx for Read Signature Bytes. Table 60. shows the content of the signature
byte for theT87C5112.
Table 60. Signature Bytes Content
Location
Contents
Comment
30h
58h
Manufacturer Code: Atmel
31h
57h
Family Code: C51 X2
60h
2Dh
Product name: AT8xC5112 8K
ROM version
60h
ADh
Product name: AT8xC5112 8K
OTP version
61h
EFh
Product revision number:
AT8xC5112 Rev.0
75
4191C–8051–02/08
AT8xC5112
Electrical Characteristics
Absolute Maximum Ratings
C = commercial..................................................... 0°C to 70°C
I = industrial ....................................................... -40°C to 85°C
Storage Temperature .................................... -65°C to + 150°C
Voltage on VCC to VSS ..........................................-0.5V to + 7V
Voltage on VPP to VSS ........................................-0.5V to + 13V
Voltage on Any Pin to VSS..................................... -0.5V to VCC + 0.5V
Note:
Stresses at or 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 these or any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure
to absolute maximum rating conditions may affect
device reliability.
Power dissipation value is based on the maximum
allowable die temperature and the thermal resistance
of the package.
Power Dissipation .............................................................. 1 W
Power Consumption Measurement
Since the introduction of the first C51 devices, every manufacturer made operating ICC
measurements under reset, which made sense for the designs were the CPU was running under reset. In our new devices, the CPU is no more active during reset, so the
power consumption is very low but is not really representative of what will happen in the
customer system. That’s why, while keeping measurements under Reset, we present a
new way to measure the operating ICC:
Using an internal test ROM, the following code is executed:
Label:
SJMP Label (80 FE)
Ports 1, 3, 4 are disconnected, RST = VCC, XTAL2 is not connected and XTAL1 is driven
by the clock.
This is much more representative of the real operating ICC.
76
4191C–8051–02/08
DC Parameters for
Standard Voltage
Table 61. DC Parameters in Standard Voltage
TA = -40°C to +85°C; VSS = 0 V; VCC = 5V ± 10%
Symbol
Parameter
Min
VIL
Input Low Voltage
VIH
Input High Voltage except XTAL1, RST
VIH1
Input High Voltage, XTAL1, RST
VOL
Output Low Voltage, ports 1, 3, 4.(6)
VOH
Output High Voltage, ports 1, 3, 4.(6)
mode pseudo bi-directional
Output High Voltage, ports 1, 3, 4.(6)
VOH2
mode Push pull
Max
Unit
-0.5
0.2 VCC - 0.1
V
0.2 VCC +
0.9
VCC + 0.5
V
0.7 VCC
VCC + 0.5
V
V
V
IOL = 1.6 mA
1.0
V
IOL = 3.5 mA
VCC - 0.3
VCC - 0.7
VCC - 1.5
V
V
V
V
V
50
90
IOH = -10 µA
IOH = -30 µA
IOH = -60 µA
VCC = 5V ± 10%
IOH = -100 µA
IOH = -1.6 mA
IOH = -3.2 mA
VCC = 5V ± 10%
MΩ
6
RST Pullup Resistor
IOL = 100 µA
0.3
V
(5)
Test Conditions
0.45
VCC - 0.3
VCC - 0.7
VCC - 1.5
Off impedance, ports 1, 3, 4.
RRST
Typ
200
-50
kΩ
VIN = 0.45V, port 1 & 3
IIL
Logical 0 Input Current ports 1, 3 and 4
ILI
Input Leakage Current
±10
µA
0.45V < VIN < VCC
ITL
Logical 1 to 0 Transition Current, ports 1, 3, 4
-650
µA
VIN = 2.0V
CIO
Capacitance of I/O Buffer
10
pF
Fc = 1 MHz
TA = 25°C
IPD
Power Down Current
20 (5)
50
µA
2.0V < VCC < 5.5V
to be
confirmed
3+ 0.4 Freq
(MHz)
at 12MHz 5.8
TBD
to be
confirmed
ICC
under
Power Supply Current Maximum values, X1 mode:
(7)
RESET
ICC
operating
at 16MHz 7.4
Power Supply Current Maximum values, X1 mode:
to be
confirmed
(7)
3 + 0.6 Freq
(MHz)
at 12MHz 10.2
µA
mA
mA
VIN = 0.45V, port 4
(3)
VCC = 5.5V (1)
VCC = 5.5V(8)
at 16MHz 12.6
ICC
idle
Power Supply Current Maximum values, X1 mode:
to be
confirmed
(7)
3 + 0.3 Freq
(MHz)
at 12MHz 3.9
mA
VCC = 5.5V(2)
at 16MHz 5.1
ICC
operating
VRET
77
to be
confirmed
Power Supply Current OSCB
Supply voltage during power down mode
2
6
VCC = 5.5V(8),
mA
at 12MHz
V
AT8xC5112
4191C–8051–02/08
AT8xC5112
DC Parameters for Low Voltage
Table 62. DC Parameters in Standard Voltage
TA = -40°C to +85°C; VSS = 0V; VCC = 2.7 to 5.5V
Symbol
Parameter
Min
VIL
Input Low Voltage
VIH
Input High Voltage except XTAL1, RST
VIH1
Input High Voltage, XTAL1, RST
VOL
Output Low Voltage, ports 1, 3, 4.(6)
Output High Voltage, ports 1, 3, 4.(6)
VOH
mode pseudo bidirectionnel
Output High Voltage, ports 1, 3, 4.(6)
VOH2
mode Push-pull
Max
Unit
-0.5
0.2 VCC - 0.1
V
0.2 VCC +
0.9
VCC + 0.5
V
0.7 VCC
VCC + 0.5
V
IOL = 100 µA
0.3
V
0.45
V
IOL = 0.8mA
1.0
V
IOL = 1.6mA
V
IOH = -10 µA
V
IOH = -30 µA
V
IOH = -60 µA
VCC - 0.3
VCC - 0.7
VCC - 1.5
V
IOH = -100 µA
V
IOH = -0.8 mA
V
IOH = -1.6 mA
MΩ
6
RST Pull-up Resistor
Test Conditions
VCC - 0.3
VCC - 0.7
VCC - 1.5
Off impedance, ports 1, 3, 4.
RRST
Typ
50
90
(5)
200
-50
kΩ
VIN = 0.45V, port 1 & 3
IIL
Logical 0 Input Current ports 1, 3 and 4
ILI
Input Leakage Current
±10
µA
0.45V < VIN < VCC
ITL
Logical 1 to 0 Transition Current, ports 1, 3, 4
-650
µA
VIN = 2.0V
CIO
Capacitance of I/O Buffer
10
pF
Fc = 1 MHz
TA = 25°C
IPD
Power Down Current
20(5)
50
µA
2.0V < VCC < 5.5V
to be
confirmed
1.5+ 0.2 Freq
(MHz)
at 12 MHz 3.4
mA
VCC = 3.3V(1)
mA
VCC = 3.3V(8)
mA
VCC = 3.3V(2)
TBD
to be
confirmed
ICC
under
Power Supply Current Maximum values, X1 mode:
(7)
RESET
µA
VIN = 0.45V, port 4
(3)
at 16 MHz 4.2
ICC
operating
Power Supply Current Maximum values, X1 mode:
to be
confirmed
(7)
1.5 + 0.3 Freq
(MHz)
at 12 MHz 5.1
at 16 MHz 6.3
ICC
Power Supply Current Maximum values, X1 mode:
idle
to be
confirmed
(7)
1.5 + 0.15 Freq
(MHz)
at 12 MHz 2
at 16 MHz 2.6
ICC
operating
VRET
Notes:
to be
confirmed
Power Supply Current OSCB
Supply voltage during power down mode
2
3
mA
VCC = 3.3V(8),
at 12 MHz
V
1. ICC under reset is measured with all output pins disconnected; XTAL1 driven with TCLCH, TCHCL = 5 ns (see Figure 36.), VIL =
VSS + 0.5V, VIH = VCC - 0.5V; XTAL2 N.C.; VPP = RST = VCC. ICC would be slightly higher if a crystal oscillator used
2. Idle ICC is measured with all output pins disconnected; XTAL1 driven with TCLCH, TCHCL = 5 ns, VIL = VSS + 0.5V, VIH = VCC 0.5V; XTAL2 N.C; Vpp = RST = VSS (see Figure 34.).
3. Power Down ICC is measured with all output pins disconnected; VPP = VSS; XTAL2 NC.; RST = VSS (see Figure 35.).
4. Not Applicable.
78
4191C–8051–02/08
5. Typicals are based on a limited number of samples and are not guaranteed. The values listed are at room temperature and
5V.
6. If IOL exceeds the test condition, VOL may exceed the related specification. Pins are not guaranteed to sink current greater
than the listed test conditions.
7. For other values, please contact your sales office.
8. Operating ICC is measured with all output pins disconnected; XTAL1 driven with TCLCH, TCHCL = 5 ns (see Figure 36.), VIL =
VSS + 0.5V,
VIH = VCC - 0.5V; XTAL2 N.C.; RST/VPP= VCC;. The internal ROM runs the code 80 FE (label: SJMP label). ICC would be
slightly higher if a crystal oscillator is used. Measurements are made with OTP products when possible, which is the worst
cas
Figure 32. VCC Test Condition, Under Reset
VCC
ICC
VCC
RST
(NC)
CLOCK
SIGNAL
XTAL2
XTAL1
VSS
All other pins are disconnected.
Figure 33. Operating ICC Test Condition
VCC
ICC
VCC
Reset = VSS after a high pulse
during at least 24 clock cycles
VCC
RST
All other pins are disconnected.
XTAL2
XTAL1
VSS
(NC)
CLOCK
SIGNAL
Figure 34. ICC Test Condition, Idle Mode
VCC
ICC
Reset = VSS after a high pulse
during at least 24 clock cycles
VCC
VCC
RST
(NC)
CLOCK
SIGNAL
79
XTAL2
XTAL1
VSS
All other pins are disconnected.
AT8xC5112
4191C–8051–02/08
AT8xC5112
Figure 35. ICC Test Condition, Power-down Mode
VCC
ICC
VCC
Reset = VSS after a high pulse
during at least 24 clock cycles
VCC
RST
All other pins are disconnected.
XTAL2
XTAL1
VSS
Figure 36. Clock Signal Waveform for ICC Tests in Active and Idle Modes
VCC-0.5V
0.7VCC
0.2VCC-0.1
0.45V
TCLCH
TCHCL
TCLCH = TCHCL = 5ns.
80
4191C–8051–02/08
DC Parameters for A/D
Converter
TA = 0°C to +70°C; VSS = 0 V; VCC = 2.7V to 5.5V
TA = -40°C to +85°C; VSS = 0 V; VCC = 2.7V to 5.5V
Table 63. DC Parameters
Symbol
Parameter
Min
Resolution
AVIN
Analog input voltage
VSS - 0.2
RREF
Resistance between Vref
and VSS
13
CAI
Analog input
Capacitance
60
Integral non-linearity
1
Offset error
Input source impedance
Max
10
Differential non-linearity
81
Typ
18
0.5
-2
Unit
Test Conditions
bit
VCC + 0.2
V
24
KΩ
pF
During sampling
lsb
0.9 VCC< VREF <
1
lsb
0.9 VCC< VREF <
2
lsb
0.9 VCC< VREF <
1
KΩ
2
VCC
VCC
VCC
For 10 bit
resolution at
maximum speed
AT8xC5112
4191C–8051–02/08
AT8xC5112
AC Parameters
Explanation of the AC
Symbols
Each timing symbol has 5 characters. The first character is always a “t” (that stands for
Time). The other characters, depending on their positions, stand for the name of a signal or the logical status of that signal. The following is a list of all the characters and
what they stand for.
Example:TXHDV = Time from clock rising edge to input data valid.
TA = -40°C to +85°C (industrial temperature range); VSS = 0V; 2.7V < VCC < 5.5V ; -L
range.
Table 64. gives the maximum applicable load capacitance for Port 1, 3 and 4. Timings
will be guaranteed if these capacitances are respected. Higher capacitance values can
be used, but timings will then be degraded.
Table 64. Load Capacitance Versus Speed Range, in pF
-L
Port 1, 3 & 4
80
Table 66, Table 69 and Table 72 give the description of each AC symbols.
Table 67, Table 70 and Table 73 give for each range the AC parameter.
Table 68, Table 71 and Table 74. give the frequency derating formula of the AC parameter. To calculate each AC symbols, take the x value corresponding to the speed grade
you need ( -L) and replace this value in the formula. Values of the frequency must be
limited to the corresponding speed grade:
Table 65. Max frequency for Derating Formula Regarding the Speed Grade
-L X1 mode,
VCC = 5V
-L X2 mode,
VCC = 5V
-L X1 mode,
VCC = 3V
-L X2 mode,
VCC = 3V
Freq (MHz)
40
33
40
20
T (ns)
25
30
25
50
Example:
TXHDV in X2 mode for a -L part at 20 MHz (T = 1/20E6 = 50 ns):
x = 133 (Table 74)
T = 50ns
TXHDV = 5T - x = 5 x 50 - 133 = 117 ns
82
4191C–8051–02/08
External Program Memory
Characteristic
Table 66. Symbol Description
Symbol
T
Parameter
Oscillator clock period
TLHLL
ALE pulse width
TAVLL
Address Valid to ALE
TLLAX
Address Hold After ALE
TLLIV
ALE to Valid Instruction In
TLLPL
ALE to PSEN
TPLPH
PSEN Pulse Width
TPLIV
PSEN to Valid Instruction In
TPXIX
Input Instruction Hold After PSEN
TPXIZ
Input Instruction Float After PSEN
TPXAV
PSEN to Address Valid
TAVIV
Address to Valid Instruction In
TPLAZ
PSEN Low to Address Float
Table 67. AC Parameters for Fix Clock
Speed
-L
X2 Mode
VCC = 5V
Min
33
25
50
33
ns
TLHLL
25
42
35
52
ns
TAVLL
4
12
5
13
ns
TLLAX
4
12
5
13
ns
78
Max
Min
Units
T
45
Max
-L
Standard
Mode
VCC = 3V
Min
65
Max
98
ns
TLLPL
9
17
10
18
ns
TPLPH
35
60
50
75
ns
TPLIV
TPXIX
83
Min
-L
X2 Mode
VCC = 3 V
Symbol
TLLIV
Max
-L
Standard
Mode
VCC = 5V
25
0
50
0
30
0
55
0
ns
ns
TPXIZ
12
20
10
18
ns
TAVIV
53
95
80
122
ns
TPLAZ
10
10
10
10
ns
AT8xC5112
4191C–8051–02/08
AT8xC5112
Table 68. AC Parameters for a Variable Clock: Derating Formula
-L
Type
Standard
Clock
-L
Symbol
X2 Clock
VCC = 5V
VCC = 3V
Units
TLHLL
Min
2T-x
T-x
8
15
ns
TAVLL
Min
T-x
0.5 T - x
13
20
ns
TLLAX
Min
T-x
0.5 T - x
13
20
ns
TLLIV
Max
4T-x
2T-x
22
35
ns
TLLPL
Min
T-x
0.5 T - x
8
15
ns
TPLPH
Min
3T-x
1.5 T - x
15
25
ns
TPLIV
Max
3T-x
1.5 T - x
25
45
ns
TPXIX
Min
x
x
0
0
ns
TPXIZ
Max
T-x
0.5 T - x
5
15
ns
TAVIV
Max
5T-x
2.5 T - x
30
45
ns
TPLAZ
Max
x
x
10
10
ns
84
4191C–8051–02/08
External Program Memory
Read Cycle
Figure 37. External Program Memory Read Cycle
12 TCLCL
TLHLL
TLLIV
ALE
TLLPL
TPLPH
PSEN
PORT 0
TLLAX
TAVLL
INSTR IN
TPLIV
TPLAZ
A0-A7
TPXIX
INSTR IN
TPXAV
TPXIZ
A0-A7
INSTR IN
TAVIV
PORT 2
ADDRESS
OR SFR-P2
External Data Memory
Characteristics
85
ADDRESS A8-A15
ADDRESS A8-A15
Table 69. Symbol Description
Symbol
Parameter
TRLRH
RD Pulse Width
TWLWH
WR Pulse Width
TRLDV
RD to Valid Data In
TRHDX
Data Hold after RD
TRHDZ
Data Float after RD
TLLDV
ALE to Valid Data In
TAVDV
Address to Valid Data In
TLLWL
ALE to WR or RD
TAVWL
Address to WR or RD
TQVWX
Data Valid to WR Transition
TQVWH
Data set-up to WR High
TWHQX
Data Hold after WR
TRLAZ
RD Low to Address Float
TWHLH
RD or WR High to ALE high
AT8xC5112
4191C–8051–02/08
AT8xC5112
Table 70. AC Parameters for a Fix Clock
Speed
-l
X2 Mode
VCC = 5v
TRLRH
85
135
125
175
ns
TWLWH
85
135
125
175
ns
60
0
Max
Min
102
0
Max
-l
Standard
Mode
VCC = 3v
Min
TRHDX
Min
-l
X2 Mode
VCC = 3 V
Symbol
TRLDV
Max
-l
Standard
Mode
VCC = 5v
Min
95
0
Max
137
0
Units
ns
ns
TRHDZ
18
35
25
42
ns
TLLDV
98
165
155
222
ns
TAVDV
100
175
160
235
ns
130
ns
TLLWL
30
TAVWL
47
80
70
103
ns
TQVWX
7
15
5
13
ns
TQVWH
107
165
155
213
ns
TWHQX
9
17
109
16
ns
TRLAZ
TWHLH
70
55
0
7
27
95
45
0
15
35
105
70
0
5
45
13
0
ns
53
ns
86
4191C–8051–02/08
Table 71. AC Parameters for a Variable Clock: Derating Formula
-L
Type
Standard
Clock
-L
Symbol
X2 Clock
VCC = 5V
VCC = 3V
Units
TRLRH
Min
6T-x
3T-x
15
25
ns
TWLWH
Min
6T-x
3T-x
15
25
ns
TRLDV
Max
5T-x
2.5 T - x
23
30
ns
TRHDX
Min
x
x
0
0
ns
TRHDZ
Max
2T-x
T-x
15
25
ns
TLLDV
Max
8T-x
4T -x
35
45
ns
TAVDV
Max
9T-x
4.5 T - x
50
65
ns
TLLWL
Min
3T-x
1.5 T - x
20
30
ns
TLLWL
Max
3T+x
1.5 T + x
20
30
ns
TAVWL
Min
4T-x
2T-x
20
30
ns
TQVWX
Min
T-x
0.5 T - x
10
20
ns
TQVWH
Min
7T-x
3.5 T - x
10
20
ns
TWHQX
Min
T-x
0.5 T - x
8
15
ns
TRLAZ
Max
x
x
0
0
ns
TWHLH
Min
T-x
0.5 T - x
10
20
ns
TWHLH
Max
T+x
0.5 T + x
10
20
ns
External Data Memory Write
Cycle
Figure 38. External Data Memory Write Cycle
TWHLH
ALE
PSEN
TLLWL
TWLWH
WR
TLLAX
PORT 0
A0-A7
TQVWX
TQVWH
TWHQX
DATA OUT
TAVWL
PORT 2
87
ADDRESS
OR SFR-P2
ADDRESS A8-A15 OR SFR P2
AT8xC5112
4191C–8051–02/08
AT8xC5112
External Data Memory Read
Cycle
Figure 39. External Data Memory Read Cycle
TWHLH
TLLDV
ALE
PSEN
TLLWL
TRLRH
TRLDV
RD
TLLAX
PORT 0
TRHDX
A0-A7
DATA IN
TRLAZ
TAVWL
PORT 2
TRHDZ
TAVDV
ADDRESS
OR SFR-P2
Serial Port Timing - Shift
Register Mode
ADDRESS A8-A15 OR SFR P2
Table 72. Symbol Description
Symbol
Parameter
TXLXL
Serial port clock cycle time
TQVHX
Output data set-up to clock rising edge
TXHQX
Output data hold after clock rising edge
TXHDX
Input data hold after clock rising edge
TXHDV
Clock rising edge to input data valid
Table 73. AC Parameters for a Fix Clock
-L (VCC=5V)
Speed
-L (VCC=3V)
X2 Mode
-L (VCC=5V)
X2 Mode
-L (VCC=3V)
33 MHz
Standard Mode
40 MHz
33 MHz
Standard Mode
40 MHz
66 MHz Equiv.
Symbol
Min
TXLXL
180
300
300
300
ns
TQVHX
100
200
200
200
ns
TXHQX
10
30
30
30
ns
TXHDX
0
0
0
0
ns
TXHDV
Max
17
Min
Max
66 MHz Equiv.
117
Min
Max
17
Min
Max
117
Units
ns
88
4191C–8051–02/08
Table 74. AC Parameters for a Variable Clock: Derating Formula
Symbol
Type
Standard
Clock
X2 Clock
-L
(VCC = 5V)
-L
(VCC = 3V)
TXLXL
Min
12 T
6T
TQVHX
Min
10 T - x
5T-x
50
50
ns
TXHQX
Min
2T-x
T-x
20
20
ns
TXHDX
Min
x
x
0
0
ns
TXHDV
Max
10 T - x
5 T- x
133
133
ns
Units
ns
Shift Register Timing
Waveforms
Figure 40. Shift Register Timing Waveforms
INSTRUCTION
0
1
2
3
4
5
6
7
8
ALE
TXLXL
CLOCK
TXHQX
TQVXH
OUTPUT DATA
WRITE to SBUF
INPUT DATA
CLEAR RI
89
0
1
2
3
4
5
6
7
TXHDX
TXHDV
VALID
VALID
VALID
SET TI
VALID
VALID
VALID
VALID
VALID
SET RI
AT8xC5112
4191C–8051–02/08
AT8xC5112
EPROM Programming and
Verification Characteristics
TA = 21°C to 27°C; VSS = 0V; VCC = 5V ± 10% while programming.
VCC = operating range while verifying.
Table 75. EEPROM Programming and Verification Characteristics
Symbol
Parameter
Min
Max
Units
VPP
Programming Supply Voltage
12.5
13
V
IPP
Programming Supply Current
75
mA
6
MHz
1/TCLCL
Oscillator Frequency
4
TAVGL
Address Setup to PROG Low
48 TCLCL
TGHAX
Address Hold after PROG
48 TCLCL
TDVGL
Data Setup to PROG Low
48 TCLCL
TGHDX
Data Hold after PROG
48 TCLCL
TEHSH
(Enable) High to VPP
48 TCLCL
TSHGL
VPP Setup to PROG Low
10
µs
TGHSL
VPP Hold after PROG
10
µs
TGLGH
PROG Width
90
TAVQV
Address to Valid Data
48 TCLCL
TELQV
ENABLE Low to Data Valid
48 TCLCL
TEHQZ
Data Float after ENABLE
0
110
µs
48 TCLCL
EPROM Programming and
Verification Waveforms
Figure 41. EPROM Programming and Verification Waveforms
PROGRAMMING
P1.0-P1.7
P2.0-P2.5
P3.4-P3.5*
VERIFICATION
ADDRESS
ADDRESS
TAVQV
P
P0
ALE/PROG
EA/VPP
CONTROL
SIGNALS
(ENABLE)
DATA OUT
DATA IN
TGHDX
TGHAX
TDVGL
TAVGL
TSHGL
TGLGH
TGHSL
VPP
VCC
VCC
TEHSH
TELQV
TEHQZ
* 8KB: up to P2.4, 16KB: up to P2.5, 32KB: up to P3.4, 64KB: up to P3.5
90
4191C–8051–02/08
External Clock Drive
Characteristics (XTAL1)
Symbol
Parameter
Min
Max
Units
TCLCL
Oscillator Period
25
ns
TCHCX
High Time
5
ns
TCLCX
Low Time
5
ns
TCLCH
Rise Time
5
ns
TCHCL
Fall Time
5
ns
60
%
TCHCX/TCLCX
Cyclic ratio in X2 mode
40
External Clock Drive
Waveforms
Figure 42. External Clock Drive Waveforms
VCC-0.5V
0.45V
0.7VCC
0.2VCC-0.1 V
TCHCX
TCHCL
TCLCH
TCLCX
TCLCL
A/D Converter
Symbol
Parameter
TConv
Conversion time
TSetup
Setup time
Fconv_ck
Min
Max
4
Clock Conversion frequency
8
Units
Clock periods (1 for
sampling, 10 for
conversion)
11
Sampling frequency
Note:
Typ
µs
350(1)
kHz
32
kHz
1. For 10 bits resolution
AC Testing Input/Output
Waveforms
Figure 43. AC Testing Input/Output Waveforms
VCC-0.5V
INPUT/OUTPUT
0.45V
0.2VCC+0.9
0.2VCC-0.1
AC inputs during testing are driven at VCC - 0.5 for a logic “1” and 0.45V for a logic “0”.
Timing measurement are made at VIH min for a logic “1” and VIL max for a logic “0”.
91
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AT8xC5112
Float Waveforms
Figure 44. Float Waveforms
FLOAT
VOH-0.1 V
VOL+0.1 V
VLOAD
VLOAD+0.1 V
VLOAD-0.1 V
For timing purposes a port pin is no longer floating when a 100 mV change from load
voltage occurs and begins to float when a 100 mV change from the loaded VOH/VOL level
occurs. IOL/IOH ≥ ± 20 mA.
Clock Waveforms
Valid in normal clock mode. In X2 mode XTAL2 signal must be changed to XTAL2
divided by two.
92
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Figure 45. Clock Waveforms
INTERNAL
CLOCK
STATE4
STATE5
STATE6
P1P2
P1P2
P1P2
STATE1
P1P2
STATE2
STATE3
P1P2
P1P2
STATE4
P1P2
STATE5
P1P2
XTAL2
ALE
THESE SIGNALS ARE NOT ACTIVATED DURING THE
EXECUTION OF A MOVX INSTRUCTION
EXTERNAL PROGRAM MEMORY FETCH
PSEN
P0
DATA
SAMPLED
FLOAT
P2 (EXT)
PCL OUT
DATA
SAMPLED
FLOAT
PCL OUT
DATA
SAMPLED
FLOAT
PCL OUT
INDICATES ADDRESS
TRANSITIONS
READ CYCLE
RD
PCL OUT (IF PROGRAM
MEMORY IS EXTERNAL)
P0
DPL OR Rt
FLOAT
P2
INDICATES DPH OR P2 SFR TO PCH
TRANSITION
WRITE CYCLE
WR
P0
PCL OUT (EVEN IF PROGRAM
MEMORY IS INTERNAL)
DPL OR Rt OUT
DATA OUT
P2
PCL OUT (IF PROGRAM
MEMORY IS EXTERNAL)
INDICATES DPH OR P2 SFR TO PCH
TRANSITION
PORT OPERATION
OLD DATA
P0 PINS SAMPLED
NEW DATA
P0 PINS SAMPLED
MOV DEST P0
MOV DEST PORT (P1, P2, P3)
(INCLUDES INT0, INT1, TO, T1)
P1, P2, P3 PINS SAMPLED
SERIAL PORT SHIFT CLOCK
TXD (MODE 0)
RXD SAMPLED
P1, P2, P3 PINS SAMPLED
RXD SAMPLED
This diagram indicates when signals are clocked internally. The time it takes the signals
to propagate to the pins, however, ranges from 25 to 125 ns. This propagation delay is
dependent on variables such as temperature and pin loading. Propagation also varies
from output to output and component. Typically though (TA = 25°C fully loaded) RD and
WR propagation delays are approximately 50 ns. The other signals are typically 85 ns.
Propagation delays are incorporated in the AC specifications.
93
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Ordering Information
Table 76. Maximum Clock Frequency
Code
-L
Standard Mode, oscillator frequency
40
Standard Mode, internal frequency
40
X2 Mode, oscillator frequency (VCC = 5V)
33
X2 Mode, internal equivalent frequency (VCC = 5V)
66
X2 Mode, oscillator frequency (VCC= 3V)
20
X2 Mode, internal equivalent frequency (VCC = 3V)
40
Unit
MHz
MHz
MHz
Table 77. Possible Order Entries
Part Number
Memory Size
Supply Voltage
Temperature
Range
Max Frequency
Package
Packing
AT80C5112-S3SIL
AT80C5112-S3RIL
AT80C5112-RKTIL
AT80C5112-RKRIL
AT83C5112-S3SIL
AT83C5112-S3RIL
OBSOLETE
AT83C5112-RKTIL
AT83C5112-RKRIL
AT87C5112-S3SIL
AT87C5112-S3RIL
AT87C5112-RKTIL
AT87C5112-RKRIL
94
4191C–8051–02/08
Packaging Information
PLCC52
95
AT8xC5112
4191C–8051–02/08
AT8xC5112
LQFP48
96
4191C–8051–02/08
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4191C–8051–02/08
/xM