Microchip MCP25020-ESL Can i/o expander family Datasheet

MCP2502X/5X
CAN I/O Expander Family
Features
Description
• Implements CAN V2.0B
- Programmable bit rate up to 1 Mb/s
- One programmable mask
- Two programmable filters
- Three auto-transmit buffers
- Two message reception buffers
- Does not require synchronization or
configuration messages
• Hardware Features
- Non-volatile memory for user configuration
- User configuration automatically loaded on
power-up
- Eight general-purpose I/O lines individually
selectable as inputs or outputs
- Individually selectable transmit-on-pinchange for each input
- Four 10-bit, analog input channels with
programmable conversion clock and VREF
sources (MCP2505X devices only)
- Message scheduling capability
- Two 10-bit PWM outputs with independently
programmable frequencies
- Device configuration can be modified via
CAN bus messages
- In-Circuit Serial Programming™ (ICSP™) of
default configuration memory
- Optional 1-wire CAN bus operation
• Low-power CMOS technology
- Operates from 2.7V to 5.5V
- 10 mA active current, typical
- 30 µA standby current (CAN Sleep mode)
• 14-pin PDIP (300 mil) and SOIC (150 mil)
packages
• Available temperature ranges:
- Industrial (I): -40°C to +85°C
- Extended (E): -40°C to +125°C
The MCP2502X/5X devices operate as I/O expanders
for a Controller Area Network (CAN) system,
supporting CAN V2.0B active, with bus rates up to
1 Mb/s. The MCP2502X/5X allows a simple CAN node
to be implemented without the need for a
microcontroller.
© 2007 Microchip Technology Inc.
The devices
exceptions:
are
identical,
with
the
following
One Wire
Digital
CANbus
Device
A/D
MCP25020
No
No
MCP25025
No
Yes
MCP25050
Yes
No
MCP25055
Yes
Yes
The MCP2502X/5X devices feature a number of
peripherals, including digital I/Os, four-channel 10-bit
A/D (MCP2505X) and PWM outputs with automatic
message transmission on change-of-input state. This
includes an analog input exceeding a preset threshold.
One mask and two acceptance filters are provided to
give maximum flexibility during system design with
respect to identifiers that the device will respond to.
The device can also be configured to automatically
transmit a unique message whenever any of several
error conditions occur.
The device is pre-programmed in non-volatile memory
so that the part defaults to a specific configuration at
power-up.
DS21664D-page 1
MCP2502X/5X
Package Types
Threshold Detection - refers to the MCP2502X/5X’s
ability to automatically transmit a message when a
predefined analog threshold is reached.
PDIP/SOIC
GP0/AN0
1
14
VDD
GP1/AN1
2
13
TXCAN/TXRXCAN*
GP2/AN2/PWM1
3
12
RXCAN/NC*
GP3/AN3/PWM2
4
11
GP7/RST/VPP
GP4/VREF-
5
10
GP6/CLKOUT
GP5/VREF+
6
9
OSC2
7
8
OSC1/CLKIN
VSS
* One-wire option available on MCP250X5 devices.
Definition of Terms
The following terms are used throughout this
document:
I/O Expander - refers to the integrated circuit (IC)
device being described (MCP2502X/5X).
Input Message - term given to messages that are
received by the MCP2502X/5X and cause the internal
registers to be modified. Once the register modification
has been performed, the MCP2502X/5X transmits a
Command Acknowledge message to indicate that the
command was received and processed.
Command Acknowledge Message - term given to the
message that is automatically transmitted by the
MCP2502X/5X after receiving and processing an input
message.
Information Request Message - term given to
Remote Request messages that are received by the
MCP2502X/5X that subsequently generate an output
message (data frame) in response.
Output Message - term given to the message that the
MCP2502X/5X sends in response to an Information
Request message.
On Bus Message - term given to the message that the
MCP2502X/5X transmits after completing the power-on/
self-configuration sequence at timed intervals, if
enabled.
Self-Configuration - term used to describe the
process of transferring the contents of the EPROM
memory array to the SRAM memory array.
On Bus - term used to describe the condition when the
MCP2502X/5X is fully-configured and ready to
transmit, or receive, on the bus. This is the only state in
which the MCP2502X/5X can transmit on the bus.
Edge Detection - refers to the MCP2502X/5X’s ability
to automatically transmit a message based upon the
occurance of a predefined edge on any digital input.
DS21664D-page 2
© 2007 Microchip Technology Inc.
MCP2502X/5X
1.0
DEVICE OVERVIEW
Figure 1-1 is the block diagram of the MCP2502X/5X
and Table 1-1 is the pinout description.
This document contains device-specific information on
the MCP2502X/5X family of CAN I/O expanders. The
CAN protocol is not discussed in depth in this
document. Additional information on the CAN protocol
can be found in the CAN specification, as defined by
Robert Bosch GmbH.
FIGURE 1-1:
The following sections detail the modules as listed in
Figure 1-1.
MCP2502X/5X BLOCK DIAGRAM
GPIO
GP0/AN0
GP1/AN1
GP2/AN2/PWM1
GP3/AN3/PWM2
GP4/VREFGP5/VREF+
User
Memory
OSC1/CLKIN
OSC2/CLKOUT
GP6/CLKOUT
GP7RST/VPP
State Machine
and
Control Logic
CAN
Protocol
Engine
Timing
Generation
PWM2
PWM1
TXCAN/
TXRXCAN
RXCAN
A/D *
* Only the MCP2505X devices have the A/D module.
TABLE 1-1:
Pin
Name
PINOUT DESCRIPTION
Pin
Number
Standard
Function
Alternate
Function
Programming
Mode Function
GP0/AN0 *
1
Bidirectional I/O pin, TTL input buffer
Analog input channel
GP1/AN1 *
2
Bidirectional I/O pin, TTL input buffer
Analog input channel
None
None
GP2/AN2/PWM2 *
3
Bidirectional I/O pin, TTL input buffer
Analog input/PWM output
None
None
GP3/AN3/PWM3 *
4
Bidirectional I/O pin, TTL input buffer
Analog input/PWM output
GP4/VREF-
5
Bidirectional I/O pin, TTL input buffer
External VREF-
Data
GP5/VREF+
6
Bidirectional I/O pin, TTL input buffer
External VREF input
Clock
VSS
7
Ground
None
Ground
OSC1/CLKIN
8
External oscillator input
External clock input
OSC2
9
External oscillator output
None
None
None
GP6/CLKOUT
10
Bidirectional I/O pin, TTL input buffer
CLKOUT output
None
GP7/RST/VPP
11
Input pin, TTL input buffer
External Reset input
Vpp
RXCAN
12
CAN data receive input
Not connected for 1-wire
None
TXCAN/TXRXCAN
13
CAN data transmit output
CAN TX and RX for 1-wire
operation (MCP250X5)
None
VDD
14
Power
None
Power
* Only the MCP2505X devices have the A/D module.
© 2007 Microchip Technology Inc.
DS21664D-page 3
MCP2502X/5X
NOTES:
DS21664D-page 4
© 2007 Microchip Technology Inc.
MCP2502X/5X
2.0
CAN MODULE
• One full-acceptance mask (standard and
extended)
• Two full-acceptance filters (standard and
extended)
• One filter for each receive buffer
• Three prioritized transmit buffers for transmitting
predefined message types
• Automatic wake-up on bus traffic function
• Error management logic for transmit and receive
error states
• Low-power SLEEP mode
The CAN module is a protocol controller that converts
between raw digital data and CAN message packets.
The main functional block of the CAN module is shown
in Figure 2-1 and consists of:
• CAN protocol engine
• Buffers, masks and filters
The module features include:
• Implementation of the CAN protocol
• Double-buffered receiver with two separate
receive buffers
FIGURE 2-1:
CAN MODULE
BUFFERS
Message
Queue
Control
TXREQ
ABTF
MLOA
TXERR
MESSAGE
TXB2
MESSAGE
TXREQ
ABTF
MLOA
TXERR
TXB1
MESSAGE
TXREQ
ABTF
MLOA
TXERR
TXB0
A
c
c
e
p
t
Acceptance Filter
RXF0
R
X
B
0
Transmit Byte Sequencer
A
c
c
e
p
t
Acceptance Mask
RXM
Identifier
Acceptance Filter
RXF1
M
A
B
Data Field
R
X
B
1
Identifier
Data Field
Receive
Error
Counter
PROTOCOL
ENGINE
Transmit<7:0>
Transmit
Error
Counter
Receive<7:0>
REC
TEC
ErrPas
BusOff
Shift<14:0>
{Transmit<5:0>, Receive<8:0>}
Comparator
Protocol
Finite
State
Machine
CRC<14:0>
Transmit
Logic
Bit
Timing
Logic
TXCAN/TXRXCAN
RXCAN
© 2007 Microchip Technology Inc.
Clock
Generator
Configuration
Registers
DS21664D-page 5
MCP2502X/5X
2.1
CAN Protocol Finite State Machine
2.3
The heart of the engine is the Finite State Machine
(FSM). This state machine sequences through
messages on a bit-by-bit basis, changing states as the
fields of the various frame types are transmitted or
received. The FSM is a sequencer controlling the
sequential data stream between the TX/RX Shift
register, the CRC register and the bus line. The FSM
also controls the Error Management Logic (EML) and
the parallel data stream between the TX/RX Shift
registers and the buffers. The FSM insures that the processes of reception, arbitration, transmission and error
signaling are performed according to the CAN protocol.
The automatic retransmission of messages on the bus
line is also handled.
2.2
The error management logic is responsible for the fault
confinement of the CAN device. Its two counters (the
Receive Error Counter (REC) and the Transmit Error
Counter (TEC)) are incremented and decremented by
commands from the Bit Stream processor. According to
the values of the error counters, the MCP2502X/5X is
set into the states error-active, error-passive or bus-off.
Error-active: Both error counters are below the errorpassive limit of 128.
Error-passive: At least one of the error counters (TEC
or REC) equals or exceeds 128.
Bus-off: The transmit error counter (TEC) equals or
exceeds the bus-off limit of 256. The device remains in
this state until the bus-off recovery sequence is
received. The bus-off recovery sequence consists of
128 occurrences of 11 consecutive recessive bits.
Cyclic Redundancy Check (CRC)
The Cyclic Redundancy Check register generates the
Cyclic Redundancy Check (CRC) code that is
transmitted after either the Control field (for messages
with 0 data bytes) or the Data field and is used to check
the CRC field of incoming messages.
FIGURE 2-2:
Error Management Logic
Note:
The MCP2502X/5X, after going bus-off,
will recover back to error-active
automatically if the bus remains idle for
128 x 11 bits. OPTREG2.ERRE must be
set to force the MCP2502X/5X to enter
Listen-only mode instead of Normal mode
during bus recovery. The current error
mode (except for bus-off) of the
MCP2502X/5X can be determined by
reading the EFLG register via the Read
CAN error message.
ERROR MODES STATE DIAGRAM
RESET
REC < 127 or
TEC < 127
Error-Active
128 occurrences of
11 consecutive
“recessive” bits
REC > 127 or
TEC > 127
Error-Passive
TEC > 255
Bus-Off
DS21664D-page 6
© 2007 Microchip Technology Inc.
MCP2502X/5X
REGISTER 2-1:
TEC - TRANSMITTER ERROR COUNTER
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
TEC7
TEC6
TEC5
TEC4
TEC3
TEC2
TEC1
TEC0
bit 7
bit 7-0
bit 0
TEC7:TEC0: Transmit Error Counter bits
Legend:
REGISTER 2-2:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
REC - RECEIVER ERROR COUNTER
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
REC7
REC6
REC5
REC4
REC3
REC2
REC1
REC0
bit 7
bit 7-0
bit 0
REC7:REC0: Receive Error Counter bits
Legend:
FIGURE 2-3:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
BIT TIME PARTITIONING
Input Signal
Sync
Prop
Segment
Phase
Segment 1
Phase
Segment 2
Sample Point
TQ
2.4
Bit Timing Logic
The Bit Timing Logic (BTL) monitors the bus line input
and handles the bus-related bit timing based on the
CAN protocol. The BTL synchronizes on a recessiveto-dominant bus transition at Start-of-Frame (hard
synchronization) and on any further recessive-todominant bus line transition if the CAN controller itself
does not transmit a dominant bit (resynchronization).
The BTL also provides programmable time segments
to compensate for the propagation delay time, phase
shifts and to define the position of the sample point
within the bit time. These programmable segments are
made up of integer units called Time Quanta (TQ). The
© 2007 Microchip Technology Inc.
nominal bit time is calculated by programming the TQ
length and the number of TQ in each time segment, as
discussed below.
2.4.1
TIME QUANTUM (TQ)
Time Quantum is a fixed unit of time derived from the
oscillator period. There is a programmable baud rate
prescaler (BRP) (with integral values ranging from 1 to
64) as well as a fixed division by two for clock
generation.
DS21664D-page 7
MCP2502X/5X
The base TQ is defined as twice the oscillator period.
Adding the BRP into the equation yields:
T Q = 2*T OSC * ( BRP + 1 )
where BRP = binary value represented by
CNF1.BRP<5:0>
By definition, the nominal bit time is programmable
from a minimum of 8 TQ to 25 TQ. Also, the minimum
nominal bit time is 1 µs, which corresponds to 1 Mb/s.
2.4.2
TIME SEGMENTS
Time segments make up the nominal bit time. The
nominal bit time can be thought of as being divided into
separate non-overlapping time segments. These
segments are shown in Figure 2-3.
•
•
•
•
Synchronization Segment (SyncSeg)
Propagation Segment (PropSeg)
Phase Buffer Segment 1 (PS1)
Phase Buffer Segment 2 (PS2)
Nominal Bit Time = T Q * ( Sync_Seg + PropSeg
+ Phase_Seg1 + Phase_Seg2 )
Rules for Programming the Segments
There are a few rules to follow when programming the
time segments:
• PropSeg + PS1 ≥ PS2
• PS2 > Sync Jump Width
• PS2 ≥ Information Processing Time
2.4.2.3
Phase Buffer Segments
The Phase Buffer Segments are used to optimally
locate the sampling point of the received bit within the
nominal bit time. The sampling point occurs between
PS1 and PS2. These segments can be automatically
lengthened or shortened by the resynchronization
process. Thus, the variation of the values of the phase
buffer segments represent the DPLL functionality.
Phase Segment 1 (PS1): The end of PS1 determines
the sampling point within a bit time. PS1 is programmable from 1 TQ - 8 TQ in duration.
Phase Segment 2 (PS2): PS2 provides delay before
the next transmitted data transition and is also programmable from 1 TQ - 8 TQ in duration. However, due
to IPT requirements, the actual minimum length of
phase segment 2 is 2 TQ. It may also be defined to be
equal to the greater of PS1 or the information processing time (IPT).
2.4.3
SAMPLE POINT
The sample point is the point of time at which the bus
level is read and the value of the received bit is
determined. The sampling point occurs at the end of
PS1. If desired, it is possible to specify multiple
sampling of the bus line at the sample point. The value
of the received bit is determined to be the value of the
majority decision of three values. The three samples
are taken at the sample point, and twice before, with a
time of TQ/2 between each sample.
2.4.4
INFORMATION PROCESSING TIME
This part of the bit time is used to synchronize the
various CAN nodes on the bus. The edge of the input
signal is expected to occur during the SyncSeg. The
duration is fixed at 1 TQ.
The Information Processing Time (IPT) is the time
segment (starting at the sample point) that is reserved
for calculation of the subsequent bit level. The CAN
specification defines this time to be less than or equal
to 2 TQ. The MCP2502X/5X defines this time to be
2 TQ. Thus, PS2 must be at least 2 TQ long.
2.4.2.2
2.4.5
2.4.2.1
Synchronization Segment
Propagation Segment
This part of the bit time is used to compensate for
physical delay times within the network. These delay
times consist of the signal propagation time on the bus
line and the internal delay time of the nodes. The delay
is calculated as being the round-trip time from
transmitter to receiver (twice the signal's propagation
time on the bus line), the input comparator delay and
the output driver delay. The length of the Propagation
Segment can be programmed from 1 TQ to 8 TQ by
setting the PRSEG2:PRSEG0 bits of the CNF2
register.
DS21664D-page 8
SYNCHRONIZATION JUMP WIDTH
To compensate for phase shifts and oscillator
tolerances between the nodes in the system, each
CAN controller must be able to synchronize to the
relevant signal edge of the incoming signal. When a
recessive-to-dominant edge in the transmitted data is
detected, the logic will compare the location of the edge
to the expected time (SyncSeg). The circuit will then
adjust the values of PS1 and PS2, as necessary, using
the programmed Synchronization Jump Width (SJW).
This adjustment is made for resynchronization during a
message and not hard synchronization, which occurs
only at the message Start-of-Frame (SOF).
© 2007 Microchip Technology Inc.
MCP2502X/5X
2.4.6.2
As a result of resynchronization, PS1 may be
lengthened or PS2 may be shortened. The amount of
lengthening or shortening of the phase buffer segments
has an upper-bound given by the SJW. The SJW is
programmable between 1 TQ and 4 TQ. The value of
the SJW will be added to PS1 (or subtracted from PS2)
depending on the phase error (e) of the edge in relation
to the receiver’s SyncSeg. The phase error is defined
as follows:
The PRSEG<2:0> bits set the length (in TQ’s) of the
propagation segment. The PS1<2:0> bits set the length
(in TQ’s) of phase segment 1. The SAM bit controls how
many times the RXCAN pin is sampled. Setting this bit
to a ‘1’ causes the bus to be sampled three times.
Twice at TQ/2 before the sample point and once at the
normal sample point (which is at the end of PS1). The
value of the bus is determined to be the value read
during at least two of the samples. If the SAM bit is set
to a ‘0’, the RXCAN pin is sampled only once at the
sample point. The BTLMODE bit controls how the
length of PS2 is determined. If this bit is set to a ‘1’, the
length of PS2 is determined by the PS2<2:0> bits of
CNF3. If the BTLMODE bit is set to a ‘0’ then the length
of PS2 is the greater of PS1 and the information
processing time (which is fixed at 2 TQ for the
MCP2502X/5X).
• e = 0 if the edge lies within SYNCESEG
- No resynchronization is required.
• e > 0 if the edge lies before the sample point
- PS1 will be lengthened by the amount of the
SJW.
• e < 0 if the edge lies after the sample point of the
previous bit and before the SyncSeg of the
current bit
- PS2 will be shortened by the amount of the
SJW.
2.4.6
2.4.6.3
Additionally, the wake-up filter (CNF3.WAKFIL) is
implemented in the CNF3 register. This filter is a lowpass filter that can be used to prevent the MCP2502X/
5X from waking up due to short glitches on the CAN
bus.
CNF1
The BRP<5:0> bits control the baud rate prescaler.
These bits set the length of TQ relative to the OSC1
input frequency, with the minimum length of TQ being
2 TOSC in length (when BRP<5:0> are set to 000000).
The SJW<1:0> bits select the synchronization jump
width in terms of number of TQ’s.
REGISTER 2-3:
CNF3
The PS2<2:0> bits set the length, in TQ’s, of PS2, if the
CNF2.BTLMODE bit is set to a ‘1’. If the BTLMODE bit
is set to a ‘0’, the PS2<2:0> bits have no effect.
CONFIGURATION REGISTERS
There are three registers (in the configuration register
module) associated with the CAN bit timing logic that
controls the bit timing for the CAN bus interface.
2.4.6.1
CNF2
CNF1 - CAN CONFIGURATION REGISTER 1
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
SJW1
SJW0
BRP5
BRP4
BRP3
BRP2
BRP1
BRP0
bit 7
bit 0
bit 7-6
SJW1:SJW0: Synchronized Jump Width bits
11 = Length = 4 x TQ
10 = Length = 3 x TQ
01 = Length = 2 x TQ
00 = Length = 1 x TQ
bit 5-0
BRP5:BRP0: Baud Rate Prescaler bits
111111 =TQ = 2 x 64 x 1/FOSC
000000 =TQ = 2 x 1 x 1/FOSC
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
© 2007 Microchip Technology Inc.
x = Bit is unknown
DS21664D-page 9
MCP2502X/5X
REGISTER 2-4:
CNF2 - CAN CONFIGURATION REGISTER 2
R/W-0
R/W-0
BTLMODE
SAM
R/W-0
R/W-0
PHSEG12 PHSEG11
R/W-0
R/W-0
R/W-0
R/W-0
PHSEG10
PRSEG2
PRSEG1
PRSEG0
bit 7
bit 0
bit 7
BTL MODE: Length determination of PHSEG2 bit
1 = Length of Phase_Seg2 determined by bits 2:0 of CNF3
0 = Length of Phase_Seg2 is the greater of Phase_Seg1 or IPT(2Tq)
bit 6
SAM: Sample of the CAN bus line bit
1 = Bus line is sampled three times at the sample point
0 = Bus line is sampled once at the sample point
bit 5-3
PHSEG12:PHSEG10: Phase Buffer Segment1 bits
111 = length = 8 x TQ
000 = length = 1 x TQ
bit 2-0
PRSEG2:PRSEG0: Propagation Time Segment bits
111 = length = 8 x TQ
000 = length = 1 x TΘ
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
REGISTER 2-5:
x = Bit is unknown
CNF3 - CAN CONFIGURATION REGISTER 3
U-0
R/W-0
U-0
U-0
U-0
R/W-0
R/W-0
R/W-0
—
WAKFIL
—
—
—
PHSEG22
PHSEG21
PHSEG20
bit 7
bit 0
bit 7
Unimplemented: (Reads as 0)
bit 6
WAKFIL: Wake-up filter bit
1 = Wake-up filter enabled
0 = Wake-up filter disabled
bit 5-3
Unimplemented: (Reads as 0)
bit 2-0
PHSEG22:PHSEG20: Phase Buffer Segment2 bits
111 = length = 8 x TQ
001 = length = 2 x TQ
000 = Invalid
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
DS21664D-page 10
x = Bit is unknown
© 2007 Microchip Technology Inc.
MCP2502X/5X
2.5
Buffers, Masks, and Filters
This part of the CAN module supports the transmitting,
receiving and acceptance of CAN messages.
Three transmit buffers are used for the three transmit
message IDs, as discussed later in this section. Two
receive buffers store the CAN message’s arbitration
field, control field and the data field.
One mask defines which bits are to be applied to either
filter. The mask can be regarded as defining “don’t
care” bits for the filter.
Each of the two filters define a bit pattern that will be
compared to all incoming messages. All filter bits that
have not been defined as “don’t care” by the mask are
applied to the message.
2.5.1
TRANSMIT MESSAGE ID’S
The MCP2502X/5X device contains three separate
transmit message ID’s: TXID0, TXID1 and TXID2. The
data length code is predefined for each of the various
output messages, with the data that is transmitted
coming directly from the contents of the device’s
peripheral registers.
2.5.1.1
Transmit Message ID0 (TXID0)
TXID0 contains the identifier that is used when transmitting the On Bus message. If enabled
(STCON.STEN = 1), the On Bus message will be
transmitted at predefined intervals. Depending on the
message-select bit (STCON.STMS = 1), the CAN
message will send GPIO and A/D data.
Transmit Message ID0 will not automatically be sent
when the device is brought out of sleep.
2.5.1.2
Transmit Message ID1 (TXID1)
TXID1 contains the identifier that is used when the
MCP2502X/5X sends the Command Acknowledge
message, the Receive Overflow message and/or the
Error Condition message. All message types use the
same identifier.
The CAEN bit, in the OPTREG2 register, selects
between the Command Acknowledge and Receive
Overflow operation. These message types have a DLC
of 0 and do not contain any data. The Error Condition
message can occur anytime, has a DLC of 3 and
contains the EFLG, TEC and REC data values.
Note:
A zero data length On Bus message will be
transmitted
once
after
power-up,
regardless of scheduled transmissionenable status.
© 2007 Microchip Technology Inc.
Command Acknowledge: TXID1 sends a Command
Acknowledge message when the MCP2502X/5X
receives an Input Message and processes the
instruction (and OPTREG2.CAEN = 1). This message
is used as a hand shake for the node requesting the
modification of the MCP2502X/5X. There is no data
associated with this message.
Receive Overflow: TXID1 sends a Receive Overflow
message if there is a Receive Overflow condition (and
OPTREG2.CAEN = 0). This only occurs if the device
has received a valid message before processing the
previous valid message from the same receive buffer.
There is no data associated with this message.
Error Condition: An Error Condition message is
transmitted if the TEC or REC counters reach error
warning (> 95) or error passive (> 127). This message
contains the TXID1 identifier and the TEC, REC and
EFLG counters.
A hysteresis is implemented in hardware that prevents
messages from repeatedly being transmitted due to
error counts changing by one or two bits. Once a
message is sent for an error warning (TEC or REC >
95), the message will not trigger again until the error
counter ≤ 79 and back to > 95 (hysteresis = 17 counts).
Similarly, an error passive message is sent at TEC or
REC > 127 and is not sent again until the error counter
≤ 111 and back to >127 (hysteresis = 17 counts).
2.5.1.3
Transmit Message ID2 (TXID2)
Transmit ID2 contains the identifier that is used when
transmitting auto-conversion-initiated messages,
including digital input edge detection and/or analog
input exceeding a threshold. This message will also be
sent when the device wakes up from sleep due to a
digital input change-of-state condition (i.e., change-ofstate occurs on input configured to transmit on
change-of-state).
2.6
Receive Buffers
The MCP2505X contains two receive buffers, each
with their own filter. There is also a Message Assembly
Buffer (MAB) that acts as a third receive buffer (see
Figure 2-1).
The two receive buffers, combined with the MAB help,
insure that received messages will be processed while
minimizing the chances of receive buffer overrun due to
maximum bus loading of messages destined for the
MCP2502X/5X.
Note:
The receive buffers are used by the
MCP2502X/5X to implement the command
messages and are not externally
accessible.
DS21664D-page 11
MCP2502X/5X
2.7
Acceptance Mask
The acceptance mask is used to define which bits in the
CAN ID are to be compared against the programmable
filters. Individual bits within the mask correspond to bits
in the CAN ID that, in turn, correspond to bits in the
acceptance filters. Any bit in the mask that is set to a ‘1’
will cause the corresponding CAN ID bit to be
compared against the associated filter bit. Any bit in the
mask that is set to a ‘0’ is not compared and effectively
sets the associated CAN ID bit to ‘don’t care’.
2.7.1
MASKS AND STANDARD/
EXTENDED IDS
Note:
2.8
To insure proper operation of the information request
and input messages, some mask bits (as configured in
the mask registers) may be ignored as explained:
Message with a standard ID - the three least
significant
bits
of
a
standard
identifier
(RXMSIDL.SID2:SID0) are ‘don’t care’ for the mask
registers and effectively become ‘0’.
REGISTER 2-6:
Message with an extended ID - the three least
significant
bits
of
the
standard
identifier
(RXMSIDL.SID2:SID0) are configurable and the three
least significant bits of the extended identifier
(RXMEID0.EID2:EID0) are always ‘don’t cares’ and
effectively becomes ‘0’.
The EXIDE bit in the Mask register
(RXMSIDL) can be used to mask the IDE
bit in the corresponding Receive buffer
register (RXBnSIDL).
Acceptance Filters
There are two separate acceptance filters defined for
the MCP2502X/5X: RXF0 and RXF1. RXF0 is used for
Information Request messages and RXF1 is used for
input messages (see Table 4-2 and Table 4-3). Each bit
in the filters corresponds to a bit in the CAN ID. Every
bit in the CAN ID, for which the corresponding Mask bit
is set, must match the associated filter bit in order for
the message to be accepted. Messages that fail to
meet the mask/fIlter criteria are ignored.
TXIDNSIDH - TRANSMIT IDENTIFIER N STANDARD IDENTIFIER HIGH
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
SID10
SID9
SID8
SID7
SID6
SID5
SID4
SID3
bit 7
bit 7-0
bit 0
SID10:SID3: Standard Identifier bits
Legend:
DS21664D-page 12
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
© 2007 Microchip Technology Inc.
MCP2502X/5X
REGISTER 2-7:
TXIDNSIDL - TRANSMIT IDENTIFIER N STANDARD IDENTIFIER LOW
R/W-x
R/W-x
R/W-x
U-0
R/W-x
U-0
R/W-x
R/W-x
SID2
SID1
SID0
—
EXIDE
—
EID17
EID16
bit 7
bit 0
bit 7-5
SID2:SID0: Standard Identifier bits
bit 4
Unimplemented: Read as '0’
bit 3
EXIDE: Extended Identifier Enable bit
1 = Message will transmit extended identifier
0 = Message will transmit standard identifier
bit 2
Unimplemented: Read as '0’
bit 1-0
EID17:EID16: Extended Identifier bits
Legend:
REGISTER 2-8:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
TXIDNEID8 - TRANSMIT IDENTIFIER N EXTENDED IDENTIFIER HIGH
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
EID15
EID14
EID13
EID12
EID11
EID10
EID9
EID8
bit 7
bit 7-0
bit 0
EID15:EID8: Extended Identifier bits
Legend:
REGISTER 2-9:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
TXIDNEID0 - TRANSMIT IDENTIFIER N EXTENDED IDENTIFIER LOW
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
EID7
EID6
EID5
EID4
EID3
EID2
EID1
EID0
bit 7
bit 7-0
bit 0
EID7:EID0: Extended Identifier bits
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
© 2007 Microchip Technology Inc.
x = Bit is unknown
DS21664D-page 13
MCP2502X/5X
REGISTER 2-10:
RXMSIDH - ACCEPTANCE FILTER MASK STANDARD IDENTIFIER HIGH
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
SID10
SID9
SID8
SID7
SID6
SID5
SID4
SID3*
bit 7
bit 7-0
bit 0
SID10:SID3: Standard Identifier bits
* If OPTREG2.MTYPE = 1, then SID3 is forced to zero.
Legend:
REGISTER 2-11:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
RXMSIDL - ACCEPTANCE FILTER MASK STANDARD IDENTIFIER LOW
R/W-x
R/W-x
R/W-x
U-0
R/W-x
U-0
R/W-x
R/W-x
SID2
SID1
SID0
—
EXIDE
—
EID17
EID16
bit 7
bit 0
bit 7-5
SID2:SID0: Standard Identifier bits
Standard messages, bits = b’000’
Extended messages, bits = SID2:SID0
bit 4
Unimplemented: Read as '0’
bit 3
EXIDE: Extended Identifier Enable bit
1 = Apply filter to RXFnSIDL.EXIDE (filter applies to standard or extended message frames
depending on filter bit)
0 = Do not apply filter to RXFnSIDL.EXIDE (filter will be applied to both standard and extended
message frames)
bit 2
Unimplemented: Read as '0’
bit 1-0
EID17:EID16: Extended Identifier bits
Legend:
REGISTER 2-12:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
RXMEID8 - ACCEPTANCE FILTER MASK EXTENDED IDENTIFIER MID
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
EID15
EID14
EID13
EID12
EID11
EID10
EID9
EID8
bit 7
bit 7-0
bit 0
EID15:EID8: Extended Identifier bits
Legend:
DS21664D-page 14
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
© 2007 Microchip Technology Inc.
MCP2502X/5X
REGISTER 2-13:
RXMEID0 - ACCEPTANCE FILTER MASK EXTENDED IDENTIFIER LOW
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
EID7
EID6
EID5
EID4
EID3
EID2
EID1
EID0
bit 7
bit 0
bit 7-3
EID7:EID3: Extended Identifier bits
bit 2-0
EID2:EID0: Extended Identifier bits (always reads as ‘0’)
Legend:
REGISTER 2-14:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
RXFNSIDH - ACCEPTANCE FILTER N STANDARD IDENTIFIER HIGH
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
SID10
SID9
SID8
SID7
SID6
SID5
SID4
SID3*
bit 7
bit 7-0
bit 0
SID10:SID3: Standard Identifier bits
* If OPTREG2.MTYPE = 1, then SID3 = X
Legend:
REGISTER 2-15:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
RXFNSIDL - ACCEPTANCE FILTER N STANDARD IDENTIFIER LOW
R/W-x
R/W-x
R/W-x
U-0
R/W-x
U-0
R/W-x
R/W-x
SID2
SID1
SID0
—
EXIDE
—
EID17
EID16
bit 7
bit 0
bit 7-5
SID2:SID0: Standard Identifier bits
1 = When EXIDE = 1, SID2:SID0 = b’xxx’
0 = When EXIDE = 0, SID2:SID0 = as configured
bit 4
Unimplemented: Read as ‘0’
bit 3
EXIDE: Extended Identifier Enable bit
1 = Filter will apply to extended identifier
0 = Filter will apply to standard identifier
bit 2
Unimplemented: Read as ‘0’
bit 1-0
EID17:EID16: Extended Identifier bits
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
© 2007 Microchip Technology Inc.
x = Bit is unknown
DS21664D-page 15
MCP2502X/5X
REGISTER 2-16:
RXFNEID8 - ACCEPTANCE FILTER N EXTENDED IDENTIFIER MID
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
EID15
EID14
EID13
EID12
EID11
EID10
EID9
EID8
bit 7
bit 7-0
bit 0
EID15:EID8: Extended Identifier Bit
Legend:
REGISTER 2-17:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
RXFNEID0 - ACCEPTANCE FILTER N EXTENDED IDENTIFIER LOW
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
EID7
EID6
EID5
EID4
EID3
EID2
EID1
EID0
bit 7
bit 7-0
bit 0
EID7:EID0: Extended Identifier Bit (always = b’xxx’)
Legend:
DS21664D-page 16
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
© 2007 Microchip Technology Inc.
MCP2502X/5X
REGISTER 2-18:
EFLG - ERROR FLAG REGISTER
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
ESCF
RBO
TXBO
TXEP
RXEP
TXWAR
RXWAR
EWARN
bit 7
bit 0
bit 7
ESCF: Error State Change (for sending Error state message)
1 = An error state change occurred
0 = No error state change
bit 6
RBO: Receive Buffer Overflow
1 = Overflow occurred
0 = No overflow occurred
bit 5
TXBO: Transmitter in Bus Off Error State bit
1 = TEC reaches 256
0 = Indicates a successful bus recovery sequence
bit 4
TXEP: Transmitter in Error Passive State bit
1 = TEC is equal to or greater than 128
0 = TEC is less than 128
bit 3
RXEP: Receiver in Error Passive State bit
1 = REC is equal to or greater than 128
0 = REC is less than 128
bit 2
TXWAR: Transmitter in Error Warning State bit
1 = TEC is equal to or greater than 96
0 = TEC is less than 96
bit 1
RXWAR: Receiver in Error Warning State bit
1 = REC is equal to or greater than 96
0 = REC is less than 96
bit 0
EWARN; Either the Receive Error counter or Transmit error counter has reached or exceeded
96 errors
1 = TEC or REC is equal to or greater than 96 (TXWAR or RXWAR = 1)
0 = Both REC and TEC are less than 96
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
© 2007 Microchip Technology Inc.
x = Bit is unknown
DS21664D-page 17
MCP2502X/5X
NOTES:
DS21664D-page 18
© 2007 Microchip Technology Inc.
MCP2502X/5X
3.0
USER REGISTERS
3.1
Description
The MCP2502X/5X allows the user to pre-program
registers pertaining to CAN module and device
configuration into non-volatile EPROM memory. In this
way, the device is initialized to a default state after
power-up. The user registers are transferred to SRAM
during the power-up sequence and many of the
registers are able to be accessed via the CAN bus once
the device establishes a connection with the bus.
Additionally, there are 16 user-defined registers that
can be used to store information about the part (e.g.,
serial number, node identifier, etc.). The registers are
summarized in Table 3-1.
TABLE 3-1:
Note 1: When transferred to RAM, the register
addresses are offset by 1Ch. Accessing
individual registers using the “Write
Register” or “Read Register command
requires use of the offset address. Also,
see Table 3-2 for information on
accessible registers not contained in user
EPROM.
2: Do not address locations outside of the
user memory map or unexpected results
may occur.
USER MEMORY MAP
Address
Name
00h
IOINTEN
01h
IOINTPO
02h
GPLAT
03h
0xFF
04h
OPTREG1
05h
Description
Address
Name
Description
Enable inputs for Transmit-On-Change
feature
1Bh
RXF0EID0
Acceptance Filter 0, Extended ID
LSB
Defines polarity for I/O or greater than/
less than operator for A/D Transmit-OnChange inputs
1Ch
RXF1SIDH
Acceptance Filter 1, Standard ID
MSB
General Purpose I/O (GPIO) Register
1Dh
RXF1SIDL
Acceptance Filter 1, Standard ID
LSB, Extended ID USB, and
Extended ID enable
Reserved
1Eh
RXF1EID8
Acceptance Filter 1, Extended ID
MSB
Configuration options, including GPIO
pull-up enable, clockout enable and
prescaler
1Fh
RXF1EID0
Acceptance Filter 1, Extended ID
LSB
T1CON
PWM1 Timer Control Register; contains
enable bit, clock prescale and DC LSBs
20h
TXID0SIDH Transmit Buffer 0, Standard ID MSB
06h
T2CON
PWM2 Timer Control Register; contains
enable bits, clock prescale and DC LSBs
21h
TXID0SIDL
Transmit Buffer 0, Standard ID LSB,
Extended ID USB, and Extended ID
enable
07h
PR1
PWM1 Period Register
22h
TXID0EID8
Transmit Buffer 0, Extended ID MSB
08h
PR2
PWM2 Period Register
23h
TXID0EID0
Transmit Buffer 0, Extended ID LSB
09h
PWM1DCH PWM1 Duty Cycle (DC) MSBs
24h
TXID1SIDH Transmit Buffer 1, Standard ID MSB
0Ah
PWM2DCH PWM2 Duty Cycle (DC) MSBs
25h
TXID1SIDL
Transmit Buffer 1, Standard ID LSB,
Extended ID USB, and Extended ID
enable
0Bh
CNF1 3
CAN module register configures
synchronization jump width and baud rate
prescaler
26h
TXID1EID8
Transmit Buffer 1, Extended ID MSB
0Ch
CNF2 3
CAN module register configures
propagation segment, phase segment 1,
and determines number of sample points
27h
TXID1EID0
Transmit Buffer 1, Extended ID LSB
0Dh
CNF3 3
CAN module register configures phase
buffer segment 2, Sleep mode
28h
TXID2SIDH Transmit Buffer 2, Standard ID MSB
Note 1:
2:
3:
4:
GPDDR is mapped to 1Fh is SRAM and not offset by 1Ch.
User memory (35h-44h) is not transferred to RAM on power-up and can only be accessed via “Read User Mem”
commands.
Cannot be modified from initial programmed values.
Unimplemented on MCP2502X devices and read 0x00 (exception, ADCON1 = 0x0F).
© 2007 Microchip Technology Inc.
DS21664D-page 19
MCP2502X/5X
TABLE 3-1:
Address
USER MEMORY MAP (CONTINUED)
Name
Description
0Eh
ADCON0
4
0Fh
ADCON14
10h
STCON
Address
Name
Description
A/D Control Register; contains enable,
conversion rate, channel select bits
29h
TXID2SIDL
Transmit Buffer 2, Standard ID LSB,
Extended ID USB, and Extended ID
enable
A/D Control Register; contains voltage
reference source, conversion rate and
A/D input enable bits
2Ah
TXID2EID8
Transmit Buffer 2, Extended ID MSB
Scheduled Transmission Control Register
2Bh
TXID2EID0
Transmit Buffer 2, Extended ID LSB
Configuration options, including Sleep
mode, RTR message and error recovery
enables
2Ch
ADCMP3H4
Analog Channel 3 Compare Value
MSB
Analog Channel 3 Compare Value
LSb’s
11h
OPTREG2
12h
—
Reserved
2Dh
ADCMP3L4
13h
—
Reserved
2Eh
ADCMP2H4 Analog Channel 2 Compare Value
MSB
14h
RXMSIDH
Acceptance Filter Mask, Standard ID MSB
2Fh
ADCMP2L4
15h
RXMSIDL
Acceptance Filter Mask, Standard ID LSB
and Extended ID USB
30h
ADCMP1H4 Analog Channel 1 Compare Value
MSB
16h
RXMEID8
Acceptance Filter Mask, Extended ID
MSB
31h
ADCMP1L4
17h
RXMEID0
Acceptance Filter Mask, Extended ID LSB
32h
ADCMP0H4 Analog Channel 0 Compare Value
MSB
18h
RXF0SIDH
Acceptance Filter 0, Standard ID MSB
33h
ADCMP0L4
19h
RXF0SIDL
Acceptance Filter 0, Standard ID LSB,
Extended ID USB, and Extended ID
enable
34h
GPDDR1
1Ah
RXF0EID8
Acceptance Filter 0, Extended ID MSB
35-44h
Note 1:
2:
3:
4:
Analog Channel 2 Compare Value
LSb’s
Analog Channel 1 Compare Value
LSb’s
Analog Channel 0 Compare Value
LSb’s
General Purpose I/O Data Direction
Register
USER[0:F]2 User Defined Bytes (0-15)
GPDDR is mapped to 1Fh is SRAM and not offset by 1Ch.
User memory (35h-44h) is not transferred to RAM on power-up and can only be accessed via “Read User Mem”
commands.
Cannot be modified from initial programmed values.
Unimplemented on MCP2502X devices and read 0x00 (exception, ADCON1 = 0x0F).
TABLE 3-2:
Addr*
Name
1Fh**
18h
ACCESSIBLE RAM REGISTERS NOT IN THE EPROM MAP
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
GPDDR
—
DDR6
DDR4
DDR4
DDR3
DDR2
DDR1
DDR0
EFLG
ESCF
RBO
TXEP
TXEP
RXEP
TXWAR
RXWAR
EWARN
Value on
POR
Value on
RST
-111 1111
-111 1111
0000 0000 0000 0000
19h
TEC
Transmit Error Counters
1Ah
REC
Receive Error Counters
0000 0000 0000 0000
50h
ADRES3H
AN3.9
AN3.8
AN3.6
AN3.6
AN3.5
AN3.4
AN3.3
AN3.2
xxxx xxxx
51h
ADRES3L
AN3.1
AN3.0
—
—
—
—
—
—
xx-- ----
uu-- ----
52h
ADRES2H
AN2.9
AN2.8
AN2.6
AN2.6
AN2.5
AN2.4
AN2.3
AN2.2
xxxx xxxx
uuuu uuuu
0000 0000 0000 0000
uuuu uuuu
53h
ADRES2L
AN2.1
AN2.0
—
—
—
—
—
—
xx-- ----
uu-- ----
54h
ADRES1H
AN1.9
AN1.8
AN1.6
AN1.6
AN1.5
AN1.4
AN1.3
AN1.2
xxxx xxxx
uuuu uuuu
55h
ADRES1L
AN1.1
AN1.0
—
—
—
—
—
—
xx-- ----
uu-- ----
56h
ADRES0H
AN0.9
AN0.8
AN0.6
AN0.6
AN0.5
AN0.4
AN0.3
AN0.2
xxxx xxxx
uuuu uuuu
ADRES0L
AN0.1
AN0.0
—
—
—
—
—
—
xx-- ----
uu-- ----
57h
*
**
These addresses are used when using the “Write Register” or “Read Register” command
The GPDDR register is not offset to RAM the same as the other registers in the EPROM
DS21664D-page 20
© 2007 Microchip Technology Inc.
MCP2502X/5X
4.0
DEVICE OPERATION
4.1
Power-Up Sequence
The following sections describe the events/actions of
the MCP2502X/5X during normal power-up and
operation.
4.1.1
POWER-ON RESET
The MCP2502X/5X goes through a sequence of events
at power-on reset (POR) in order to load the
programmed configuration and insure that errors are
not introduced on the bus. During this time, the device
is prevented from generating a low condition on the
TXCAN pin. The TXCAN pin must remain high from
power-on until the device goes on bus.
Scheduled Transmissions
Once the MCP2502X/5X has gone on bus it will
transmit the On Bus message once, regardless of
whether enabled or not. This message notifies the
network of the MCP2502X/5X’s presence. The On Bus
message will (if enabled STCON.STEN) repeat at a
frequency determined by the STCON register
(Register 4-1).
This message can also be configured to send the
“Read A/D Register” data bytes along with the
predefined
identifier
in
TXID2
by
setting
STCON.STMS = 1.
Note:
The first On Bus message sent after
power-up will NOT send the “Read A/D
Register” data bytes, regardless of the
STCON.STMS value.
Note:
If the MCP2502X/5X enters SLEEP mode,
the scheduled transmissions will cease
until the device wakes up again. This
implies that SLEEP mode has priority over
scheduled transmissions.
Operational Mode at Power-On
The MCP2502X/5X initially powers up in Configuration
mode. While in this mode, the MCP2502X/5X will be
prevented from sending or receiving messages via the
CAN interface. The ADC and PWM peripherals are
disabled while in this mode.
Self-Configuration
Once the MCP2502X/5X is out of reset, it will perform
a self-configuration. This is accomplished by
transferring the contents of the EPROM array to the
corresponding locations within the SRAM array. In
addition, the checksum of the data written to SRAM will
be compared to a pre-programmed value as a test of
valid data.
Going On Bus
Once the self-configuration cycle has successfully
completed, the MCP2502X/5X switches to Listen-only
mode. It will remain in this mode until an error-free CAN
message is detected. This is done to ensure that the
device is at the correct bus rate for the system.
Once the device detects an error-free message, it waits
for CAN bus idle before switching to Normal mode. This
prevents it from going on bus in the middle of another
node’s transmission and generating an error frame.
Alternately, the MCP2505X may directly enter Normal
mode (without first entering Listen-only Mode) after
completing its self-configuration. This is configured by
the user via a control bit (OPTREG2.PUNRM).
Once the MCP2502X/5X enters Normal mode, it is
ready to send/receive messages via the CAN interface.
At this point the ADC and PWM peripherals are
operational, if enabled.
© 2007 Microchip Technology Inc.
4.2
Message Functions
The MCP2502X/5X uses the global mask (RXMASK),
two filters (RXF0 and RXF1) and two receive buffers
(RB0 and RB1) to determine if a received message
should be acted upon. There are 16 functions that can
be performed by the MCP2502X/5X based on received
messages (see Table 4-1).These functions allow the
device to not only be accessed for Information
Request/Input/Output operations, but also to be
reconfigured via the CAN bus, if necessary.
4.3
Message Types
There are three types of messages that are used to
implement the functions of Table 4-1.
1.
2.
3.
Information Request Messages (IRM)
- Received by the MCP2502X/5X.
Output Messages - Transmitted from the
MCP2502X/5X as a response to IRMs.
Input Messages - Received by the MCP2502X/
5X and used to modify registers.
Note:
Information Request Messages (IRMs)
and Input messages are both input
messages to the MCP2502X/5X. IRMs are
received into receive buffer 0 and input
messages are received into receive buffer
1. This must be taken into account while
configuring the acceptance filters.
DS21664D-page 21
MCP2502X/5X
4.3.1
INFORMATION REQUEST
MESSAGES
Information Request Messages (IRM) are messages
that the MCP2502X/5X receives into Receive Buffer 0
(matches Filter 0) and then responds to by transmitting
a message (output message) containing the requested
data.
IRMs can be implemented as either a Remote Transfer
Request (RTR) or a Data Frame message by
configuring the MTYPE bit in the OPTREG2 register.
TABLE 4-1:
Name
MESSAGE FUNCTION
Description
Read A/D
Registers
Transmits a single message containing
the current state of the analog and I/O
registers, including the configuration
Read Control
Registers
Transmits several control registers not
included in other messages
Read Configuration Registers
Transmits the contents of many of the
configuration registers
Read CAN
error states
Transmits the error flag register and
the error counts
Read PWM
Configuration
Transmits the registers associated with
the PWM modules
Read User
Registers 1
Transmits the values in bytes 0 - 7 of
the user memory
Read User
Registers 2
Transmits the values in bytes 8 -15 of
the user memory
Read Register*
Transmits a single byte containing the
value in an addressed user memory
register
Write Register
Uses a mask to write a value to an
addressed register
Write TX Message Writes the identifiers to a specified
ID0 (TXID0)
value
Write TX Message Writes the identifiers to a specified
ID1 (TXID1)
value
Write TX Message Writes the identifiers to a specified
ID2 (TXID2)
value
Write I/O
Configuration
Registers
Writes specified values to the three
IOCON registers
Write RX Mask
Changes the receive mask to the
specified value
Write RX Filter0
Changes the specified filter to the
specified value
Write RX Filter1
Changes the specified filter to the
specified value
* The Read Register command is available when using
extended message format only. Not available with
standard message format.
DS21664D-page 22
4.3.1.1
RTR Message Type
When
RTR
message
types
are
selected
(OPTREG2.MTYPE) and a node in the system wants
information from the MCP2502X/5X, it has to send a
remote frame on the bus. The identifier for the remote
frame must be such that it will be accepted through the
MCP2502X/5X’s mask/filter process (using RXF0). The
RTR message type (remote frames) is the default
configuration (MTYPE bit = 0).
Information Request “RTR” messages must not only
meet the RXMASK/RXF0 criteria but must also have
the RTR bit of the CAN ID set (since the filter registers
do not contain an explicit RTR bit). If a message passes
the mask/filter process and the RTR bit is a ‘0’, that
message will be ignored.
Once the MCP2502X/5X has received a remote frame,
it will determine the function to be performed based
upon the three LSb’s (RXB0SIDL.SID2:SID0 for
standard messages and RXB0EID0.EID2:EID0 for
extended messages) of the received remote frame.
Additionally, a predefined Data Length Code (DLC)
must be sent to signify the number of data bytes that
the MCP2502X/5X must return in it’s output message
(see Table 4-2 and Table 4-3).
4.3.1.2
Data Frame Message Type
When a non-RTR (or data frame) message type is
selected and a node in the system wants information
from the MCP2502X/5X, it sends an Information
Request in the form of a data frame. The identifier for
this request must be such that it will be accepted
through the MCP2502X/5X’s mask/filter process (using
RXF0).
Information request messages in the data frame format
must not only meet the RXMASK/RXF0 criteria, but
must also have the RTR bit of the CAN ID cleared
(since the filter registers do not contain an explicit RTR
bit). If a message passes the mask/filter process and
the RTR bit is a ‘1’, that message will be ignored.
Once the MCP2502X/5X has received a data frame
information request, it will determine the function to be
performed
based
upon
the
three
LSb’s
(RXB0SIDL.SID2:SID0 for standard messages and
RXB0EID0.EID2:EID0 for extended messages) of the
received data frame. Also, Bit 3 of the received
message ID must be set to a ‘1’.
In addition, the data length code (DLC) must be set to
a zero. Refer to Table 4-2 and Table 4-3 for more
information.
Regardless of the message format, all messages
except the Read Register message can use either
standard or extended identifiers. The Read Register
message has one additional requirement; it must be an
extended identifier. This is discussed in more detail in
Table 4-1 and Table 4-3 for more information.
© 2007 Microchip Technology Inc.
MCP2502X/5X
4.3.2
OUTPUT MESSAGES
The data frame sent in response to the information
request message is defined as an output message.
If the data fame is in response to a remote frame, it will
have the same identifier (standard or extended) and
contain the same number of data bytes specified by the
DLC of the remote frame (per the CAN 2.0B
specification).
Note: If the DLC of the incoming remote frame
differs from the message definitions
summarized in Table 4-2 and Table 4-3, the
resulting output message will limit itself to the
erroneous DLC that was received (to
maintain compliance with the Bosch CAN
specification). The output message will
concatenate the number of data bytes for an
erroneous DLC that is less than the defined
number. For an erroneous DLC that is
greater than the defined number, the
MCP2502X/5X will extend the number of
data bytes, with the data value of the last
defined data byte being repeated in the extra
bytes in the data field.
If the output message is in response to a data frame,
the lower-three LSb’s of the identifier (standard or
extended) must be the same as the received message,
as well as the upper-seven MSb’s in the case of a
standard identifier, or the upper 25 MSb’s in the case of
an extended identifier. Bit 3 of a standard or extended
identifier of the output message will differ from the
received information request message in that the value
equals ‘1’ for an IRM and equals ‘0’ for the resulting
output message.
Output messages contain the requested data (in the
data field). Example: The information request
message Read CAN error is a remote transmit request
received by the MCP2502X/5X with a DLC of 3. The
responding output message will return a data frame
that contains the same identifier (standard or extended)
as the receive message. The accompanying data bytes
will contain the values of the predefined GPIO registers
and related control/status registers, as shown in
Table 4-2 and 4-3.
4.3.3
INPUT MESSAGES
Input messages are received into receive buffer 1 and
are used to change the values of the pre-defined
groups of registers. There is also an input message
that can change a single register’s contents. The
primary purpose of input messages are to reconfigure
MCP2502X/5X parameters (if needed) while in an
operating CAN system and are, therefore, optional in
system implementation. These messages are in the
form of standard (or extended) data frames (per the
CAN 2.0B specification) that have identifiers which
pass the MCP2502X/5X’s mask/filter process (using
RXF1). After passing the mask and filter, the lower-
© 2007 Microchip Technology Inc.
three
bits
of
the
standard
identifier
(RXF1SIDL.SID2:SID0) will indicate which register(s)
are to be written. The values for the register(s) are
contained in the data byte registers as defined in
Table 4-2.
Note: If using more than one controlling node, the
MCP2502X/5X must be set up to accept
input messages with different identifiers in
order to avoid possible message collisions in
the DLC or data bytes if transmitted at the
same time.
Note 1: IRMs can theoretically be sent by more
than one controlling node because the
message is a predefined constant and
destructive collisions will not occur.
2: The number of data bytes in an input
message must match the DLC number as
defined in Table 4-2 and Table 4-3. If the
user specifies and transmits an input
message with a DLC that is less than the
required number of data bytes, the
MCP25020 will operate on corrupted data
for the bytes that it did not receive and
unknown results will occur.
4.4
Dynamic Message Handling
The design insures that transmit and receive messages
are handled properly for variable bus-loading
conditions and different transmit/receive combinations.
4.4.1
MESSAGE ACCEPTANCE/
REJECTION
Messages received that meet the Mask/RXFn criteria
are then compared to the requirements for input
messages or IRMs, as determined by the filter used to
accept the message. If the message meets the
requirements of one of the associated input or
information request messages, the appropriate actions
for that message function are taken.
4.4.2
RECEIVING MULTIPLE MESSAGES
The MCP2502X/5X can only receive and process one
message at a time. While the MCP2502X/5X should
have ample time to process any received message
before another is completely received, a second
message received before the first message is finished
processing will be lost.
However, the MCP2502X/5X has the ability to notify the
network if a message is lost. TXID1 can be configured
to transmit a message if a receive overflow occurs
(OPTREG2.CAEN = 0).
DS21664D-page 23
MCP2502X/5X
4.4.3
TRANSMIT MESSAGE PRIORITY
There is a priority for all transmit messages, including
TXIDn and all “Output” messages.
The transmit message priority is as follows:
1.
2.
3.
4.
Output messages have the highest priority.
Prioritization of the individual output message
types is determined by the three bits that
determine message type, with the lowest value
having the highest priority (e.g., Read A/D Regs
is a higher priority than Read Control Regs).
TXID2 (Transmit auto-converted messages) has
the second-highest priority.
TXID1 (Command acknowledge) has the thirdhighest priority.
TXID0 (On Bus message) has the lowest
priority.
In the event two or more messages are pending
transmission, transmit-message-prioritization will occur
and the highest message type will be sent first.
Messages that are currently transmitting will not be
prioritized.
DS21664D-page 24
© 2007 Microchip Technology Inc.
© 2007 Microchip Technology Inc.
TABLE 4-2:
COMMAND MESSAGES (STANDARD IDENTIFIER)
Information Request Messages (to MCP2502X/5X)
Standard ID
1 9 8 7 6 5 4 3 2 1 0
0
Read A/D Regs
Read Control Regs
Read Config Regs
Read CAN Error
Read PWM Config
Read User Mem (bank1)
Read User Mem (bank 2)
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
*
*
*
*
*
*
*
x
x
x
x
x
x
x
0
0
0
0
1
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
Data Bytes
R
T
R
I
D
E
1*
1*
1*
1*
1*
1*
1*
0
0
0
0
0
0
0
DLC
1
0
0
0
0
1
1
0
1
1
0
1
0
0
0
1
0
1
1
0
0
0
1
1
1
0
0
0
8*
7*
5*
3*
6*
8*
8*
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
AN2H
IOINTEN
n/a
n/a
PWM2DC
USERID5
USERID1
AN3H
IOINTPO
n/a
n/a
n/a
USERID6
USERID1
AN32L
n/a
n/a
n/a
n/a
USERID7
USERID1
Output Messages (from MCP2502X/5X)
Standard ID
Data Bytes
1 9 8 7 6 5 4 3 2 1 0 R I
0
T D
R E
Read A/D Regs
Read Control Regs
Read Config Regs
Read CAN Error
Read PWM Config
Read User Mem (bank1)
Read User Mem (bank 2)
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
*
*
*
*
*
*
*
0
0
0
0
1
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
DLC
1
0
0
0
0
1
1
0
1
1
0
1
0
0
0
1
0
1
1
0
0
0
1
1
1
0
0
0
8
7
5
3
6
8
8
IOINTFL
ADCON0
DDR
EFLG
PR1
USERID0
USERID8
GPIO
ADCON1
GPIO
TEC
PR2
USERID1
USERID9
AN0H
OPTREG
CNF1
REC
T1CON
USERID2
USERID1
AN1H
OPTREG
CNF2
n/a
T2CON
USERID3
USERID1
AN10L
STCON
CNF3
n/a
PWM1DC
USERID4
USERID1
Input Messages** (to MCP2502X/5X)
Standard ID
DLC
DS21664D-page 25
Write Register
x x x x x x x x 0 0 0 0 0 0 0 1 1 3
addr
mask
value
n/a
n/a
n/a
n/a
n/a
Write TX Message ID 0
x x x x x x x x 0 0 1 0 0 0 1 0 0 4 TX0SIDH TX0SIDL TX0EID8 TX0EID0
n/a
n/a
n/a
n/a
Write TX Message ID 1
x x x x x x x x 0 1 0 0 0 0 1 0 0 4 TX1SIDH TX1SIDL TX1EID8 TX1EID0
n/a
n/a
n/a
n/a
Write TX Message ID 2
x x x x x x x x 0 1 1 0 0 0 1 0 0 4 TX2SIDH TX2SIDL TX2EID8 TX2EID0
n/a
n/a
n/a
n/a
Write I/O Configuration
x x x x x x x x 1 0 0 0 0 0 1 0 1 5 IOINTEN IOINTPO
DDR
OPTREG ADCON1
n/a
n/a
n/a
Write RX Mask
x x x x x x x x 1 0 1 0 0 0 1 0 0 4 RXMSIDH RXMSIDL RXMEID8 RXMEID0
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
Write RX Filter0
x x x x x x x x 1 1 0 0 0 0 1 0 0 4 RXF0SID RXF0SID RXF0EID RXF0EID
Write RX Filter1
x x x x x x x x 1 1 1 0 0 0 1 0 0 4 RXF1SID RXF1SID RXF1EID RXF1EID
n/a
n/a
n/a
n/a
* If using non-RTR messages for information request messages (IRM), the RTR bit = 0, DLC bit field = 0, and bit 3 of the IRM ID = 1. Also, bit 3 of the output message ID = 0.
If using RTR messages for IRMs, the RTR bit = 1, DLC bit field = number of bytes in corresponding output message, and bit three of the IRM ID = x (don’t care), also, bit 3 of the
output message = x (don’t care).
** User-defined IRM IDs must be different from input message IDs to avoid message contention between the corresponding output message and the input message.
MCP2502X/5X
1 9 8 7 6 5 4 3 2 1 0 R I
0
T D
R E
Data Bytes
COMMAND MESSAGES (EXTENDED IDENTIFIER)
Information Request Messages (to MCP2502X/5X)
Standard ID
Extended ID
1987654321 0RI
0
T D
RE
Read A/D Regs
Read Control Regs
Read Config Regs
Read CAN Error
Read PWM Config
Read User Mem
Read User Mem
Read Register
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
DLC
1
0
0
0
0
1
1
0
0
1
1
0
1
0
0
0
0
1
0
1
1
0
0
0
0
1
1
1
0
0
0
0
8*
7*
5*
3*
6*
8*
8*
1*
11
76
RXBEID8
(8 bits)
RXBEID0
(8 bits)
x
x
x
x
x
x
x
x
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
addr
xxxx *000
xxxx *001
xxxx *010
xxxx *011
xxxx *100
xxxx *101
xxxx *110
xxxx *111
x
x
x
x
x
x
x
x
Data Bytes
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
Output Messages (from MCP2502X/5X)
Standard ID
Extended ID
1 9876 5432 1 0R I
0
T D
R E
Read A/D Regs
Read Control Regs
Read Config Regs
Read CAN Error
Read PWM Config
Read User Mem
Read User Mem
Read Register
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
DLC
1
0
0
0
0
1
1
0
0
1
1
0
1
0
0
0
0
1
0
1
1
0
0
0
0
1
1
1
0
0
0
0
8
7
5
3
6
8
8
1
1 1 RXBEID8
7 6 (8 bits)
RXBEID0
(8 bits)
x
x
x
x
x
x
x
x
xxxx *000
xxxx *001
xxxx *010
xxxx *011
xxxx *100
xxxx *101
xxxx *110
xxxx *111
x
x
x
x
x
x
x
x
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
addr
Data Bytes
IOINTFL
GPIO
AN0H
AN1H
AN10L
AN2H
AN3H
AN32L
ADCON0 ADCON1 OPTREG OPTREG STCON IOINTEN IOINTPO
n/a
DDR
GPIO
CNF1
CNF2
CNF3
n/a
n/a
n/a
EFLG
TEC
REC
n/a
n/a
n/a
n/a
n/a
PR1
PR2
T1CON
T2CON
PWM1D PWM2D
n/a
n/a
USERID0 USERID1 USERID2 USERID3 USERID4 USERID5 USERID6 USERID7
USERID8 USERID9 USERID1 USERID1 USERID1 USERID1 USERID1 USERID1
value
n/a
n/a
n/a
n/a
n/a
n/a
n/a
Input Messages (to MCP2502X/5X)
Standard ID
© 2007 Microchip Technology Inc.
1 9876 5432 1 0R I
0
T D
R E
Extended ID
DLC
1 1 RXBEID8
7 6 (8 bits)
Data Bytes
RXBEID0
(8 bits)
addr
mask
value
n/a
n/a
n/a
n/a
n/a
Write Register
x x x x x x x x x x x 0 1 0 0 1 1 3 x x xxxx xxxx xxxx x000
Write TX Message x x x x x x x x x x x 0 1 0 1 0 0 4 x x xxxx xxxx xxxx x001 TX0SIDH TX0SIDL TX0EID8 TX0EID0
n/a
n/a
n/a
n/a
Write TX Message x x x x x x x x x x x 0 1 0 1 0 0 4 x x xxxx xxxx xxxx x010 TX1SIDH TX1SIDL TX1EID8 TX1EID0
n/a
n/a
n/a
n/a
Write TX Message x x x x x x x x x x x 0 1 0 1 0 0 4 x x xxxx xxxx xxxx x011 TX2SIDH TX2SIDL TX2EID8 TX2EID0
n/a
n/a
n/a
n/a
Write I/O Configura- x x x x x x x x x x x 0 1 0 1 0 1 5 x x xxxx xxxx xxxx x100 IOINTEN IOINTPO
DDR
OPTREG ADCON1
n/a
n/a
n/a
Write RX Mask
x x x x x x x x x x x 0 1 0 1 0 0 4 x x xxxx xxxx xxxx x101
RXMRXMSIDL RXMEID8 RXMEID0
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
Write RX Filter0
x x x x x x x x x x x 0 1 0 1 0 0 4 x x xxxx xxxx xxxx x110 RXF0SID RXF0SID RXF0EID RXF0EID
Write RX Filter1
x x x x x x x x x x x 0 1 0 1 0 0 4 x x xxxx xxxx xxxx x111 RXF1SID RXF1SID RXF1EID RXF1EID
n/a
n/a
n/a
n/a
* If using non-RTR messages for information request messages (IRM), the RTR bit = 0, DLC bit field = 0, and bit 3 of the IRM ID = 1. Also, bit 3 of the output message ID = 0.
If using RTR messages for IRMs, the RTR bit = 1, DLC bit field = number of bytes in corresponding output message, and bit three of the IRM ID = x (don’t care), also, bit 3 of the
output message = x (don’t care).
** User-defined IRM IDs must be different from input message IDs to avoid message contention between the corresponding output message and the input message.
MCP2502X/5X
DS21664D-page 26
TABLE 4-3:
MCP2502X/5X
4.5
Automatic Transmission
The MCP2502X/5X can automatically initiate four
different message types to indicate the following
situations:
•
•
•
•
Edge detected on a digital input (TXID2).
Threshold exceeded on an analog input (TXID2).
Error condition (Read Error output message).
Scheduled transmissions (TXID0).
The buffers have an implied transmit priority, where
buffer 2 is the highest and buffer 0 is the lowest.
Therefore, multiple message buffers can be requested
for transmission and each one will be sent in order of
priority.
4.5.1
DIGITAL INPUT EDGE DETECTION
Each GPIO pin configured as a digital input can be
individually configured to automatically transmit a
message when a defined edge occurs, as explained in
the GPIO module section. When transmitting this
message, the MCP2502X/5X uses TXID2. The DLC is
set to two and the first two bytes of the Read A/D
registers (IOINTFL and GPIO) are sent.
4.5.2
4.5.2.1
• The user sets the upper-eight bits of the 10-bit
compare register (ADCMP0H). The lower-two bits
of the compare register are not configurable by
the user and are forced to either b’11’ or b’00’
depending on the polarity of the compare
threshold (i.e., transmit is triggered above or
below the compare value via the IOINTPO
register).
• The user sets the polarity of the compare
threshold (IOINTPO). In this example, the
threshold is set for triggering a message on an
A/D > compare register. The two LSb’s are forced
to b’11’.
• When the A/D conversion exceeds the compare
register (b’nnnn nnnn 11’), an automatic
transmission will occur once.
• In order for the automatic transmission to occur
again, the A/D value must first drop below the
compare register b’nnnn nnnn 00’ and then
back above the compare register
b’nnnn nnnn 11’.
FIGURE 4-1:
ANALOG INPUT THRESHOLD
DETECTION
Each GPIO pin that has been configured as an analog
input can be individually configured to automatically
transmit a message when a threshold is exceeded as
described in the Analog-to-Digital Converter Module
section. The MCP2502X/5X sends TXID2 when
transmitting this message. The DLC is set to eight and
the eight bytes of the ‘Read A/D Registers’ are sent.
Note:
A hysteresis example:
Set to Trigger when A/D>Compare Register
LSbs = b’11’
LSbs = b’00’
A/D above compare,
A/D above compare,
Message sent
Message sent
A/D below compare,
Reset
The GPIO register that is sent with the
message (data byte 2) can be ignored if
there are no digital inputs enabled for
change-of-state, as it contains no useful
information for the Analog Input Threshold
Detect function.
Set to Trigger when A/D<Compare Register
LSbs = b’11’
LSbs = b’00’
A/D above compare,
Reset
Hysteresis Function
This function is automatic and will insure that an analog
value that is on the compare edge (i.e., toggling LSb)
does not fill the CAN bus with continuous A/D message
transmissions.
The hysteresis uses the two LSb’s of the compare
register. These two bits are forced and are not
configurable by the user. They will be forced to either
b’00’ or b’11’, depending on the compare polarity. If
configured for A/D result > compare register, the
automatic transmission will occur when the A/D value
is greater than or equal to b’nnnn nnnn 11’ and
reset when less than or equal to b’nnnn nnnn 00’.
The opposite conditions must occur if the compare
polarity is set for A/D result < compare register.
© 2007 Microchip Technology Inc.
HYSTERESIS
FUNCTION
A/D below compare,
Message sent
4.5.3
A/D below compare,
Message sent
ERROR CONDITION
The MCP2502X/5X can be configured to automatically
transmit a message whenever one or more of the
following error conditions occur:
•
•
•
•
•
Receiver has entered error-warning state
Receiver has entered error-passive state
Transmitter has entered error-warning state
Transmitter has entered error-passive state
A Receive buffer has overflowed
DS21664D-page 27
MCP2502X/5X
If the Error Condition message is enabled
(OPTREG2.TXONE = 1) and one of the above
conditions occur, the MCP2502X/5X sends TXID1
identifier with output message Read CAN Error States
data field (three data bytes).
4.5.4
SCHEDULED TRANSMISSIONS
The MCP2502X/5X has the capability of sending
scheduled transmissions (On Bus message), if
enabled.
Scheduled Transmission
= STBF1:STBF0(STM3:STM0)
Message Type - The message sent for scheduled
transmissions consists of either TXID0 with zero data
bytes or TXID0 with eight data bytes containing the
Read A/D Regs message, depending on STMS bit in
the STCON register.
Note:
The scheduled transmission control register (STCON)
enables and configures the occurrence of the
scheduled message. Setting the STEN bit in the
STCON register enables the scheduled message. The
STBF1:STBF0 and STM3:STM0 bits allow a scheduled
transmission to be initiated from a minimum of 256 µs
to a maximum of 16.8 seconds (using a 16 MHz FOSC)
and the following equation:
REGISTER 4-1:
The actual scheduled transmission
intervals may vary slightly due to the
internal event que of the control module.
STCON - SCHEDULED TRANSMISSION CONTROL REGISTER
R/W-0
R/W-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
STEN
STMS
STBF1
STBF0
STM3
STM2
STM1
STM0
bit 7
bit 0
bit 7
STEN: Scheduled Transmission Enable bits
1 = Enabled
0 = Disabled
bit 6
STMS: Scheduled Transmission Message Select
1 = Sends Transmit ID 0 (TXID0) with the “Read A/D Regs” data (DLC = 8)
0 = Sends Transmit ID 0 (TXID0) with no data (DLC = 0)
bit 5-4
STBF1:STBF0: Base Transmission Frequency bits
00 = 4096TOSC
01 = 16•(4096TOSC)
10 = 256•(4096TOSC)
10 = 4096•(4096TOSC)
(e.g., STBF1:STBF0 => 00 => 256 µs for a 16 MHz FOSC)
bit 3-0
STM3:STM0: Scheduled Transmission Multiplier bits
0000 = 1
0001 = 2
1110 = 15
1111 = 16
Legend:
DS21664D-page 28
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
© 2007 Microchip Technology Inc.
MCP2502X/5X
TABLE 4-4:
Addr
Name
0Bh
0Ch
REGISTERS ASSOCIATED WITH THE CAN MODULE
bit7
bit6
bit5
bit4
bit3
bit2
CNF1
SJW1
SJW0
BRP5
BRP4
BRP3
BRP2
CNF2
BTLMODE
SAM
PHSEG12
PHSEG11
PHSEG10
PRSEG2
bit0
Value on
POR
Value on
RST
BRP1
BRP0
xxxx xxxx
uuuu uuuu
PRSEG1
PRSEG0
xxxx xxxx
uuuu uuuu
bit1
0Dh
CNF3
—
WAKF
—
—
—
PHSEG22
PHSEG21
PHSEG20
-x-- xxxx
-u-- uuuu
10h
STCON
STEM
STMS
STBF1
STBF0
STM3
STM2
STM1
STM0
0xxx xxxx
0uuu uuuu
11h
OPTREG2
CAEN
ERRE
TXONE
SLPEN
MTYPE
PDEFEN
PUSLP
PUNRM
0000 0000
uuuu uuuu
14h
RXMSIDH
SID10
SID9
SID8
SID7
SID6
SID5
SID4
SID3
xxxx xxxx
uuuu uuuu
15h
RXMSIDL
SID2
SID1
SID0
—
—
—
EID17
EID16
xxx- --xx
uuu- --uu
16h
RXMEID8
EID15
EID14
EID13
EID12
EID11
EID10
EID9
EID8
xxxx xxxx
uuuu uuuu
17h
RXMEID0
EID7
EID6
EID5
EID4
EID3
EID2
EID1
EID0
xxxx xxxx
uuuu uuuu
18h
RXF0SIDH
SID10
SID9
SID8
SID7
SID6
SID5
SID4
SID3
xxxx xxxx
uuuu uuuu
19h
RXF0SIDL
SID2
SID1
SID0
—
—
—
EID17
EID16
xxx- --xx
uuu- --uu
1Ah
RXF0EID8
EID15
EID14
EID13
EID12
EID11
EID10
EID9
EID8
xxxx xxxx
uuuu uuuu
1Bh
RXF0EID0
EID7
EID6
EID5
EID4
EID3
EID2
EID1
EID0
xxxx xxxx
uuuu uuuu
1Ch
RXF1SIDH
SID10
SID9
SID8
SID7
SID6
SID5
SID4
SID3
xxxx xxxx
uuuu uuuu
1Dh
RXF1SIDL
SID2
SID1
SID0
—
—
—
EID17
EID16
xxx- --xx
uuu- --uu
1Eh
RXF1EID8
EID15
EID14
EID13
EID12
EID11
EID10
EID9
EID8
xxxx xxxx
uuuu uuuu
1Fh
RXF1EID0
EID7
EID6
EID5
EID4
EID3
EID2
EID1
EID0
xxxx xxxx
uuuu uuuu
20h
TXB0SIDH
SID10
SID9
SID8
SID7
SID6
SID5
SID4
SID3
xxxx xxxx
uuuu uuuu
21h
TXB0SIDL
SID2
SID1
SID0
—
EXIDE
—
EID17
EID16
xxx- x-xx
uuu- u-uu
22h
TXB0EID8
EID15
EID14
EID13
EID12
EID11
EID10
EID9
EID8
xxxx xxxx
uuuu uuuu
23h
TXB0EID0
EID7
EID6
EID5
EID4
EID3
EID2
EID1
EID0
xxxx xxxx
uuuu uuuu
24h
TXB1SIDH
SID10
SID9
SID8
SID7
SID6
SID5
SID4
SID3
xxxx xxxx
uuuu uuuu
25h
TXB1SIDL
SID2
SID1
SID0
—
EXIDE
—
EID17
EID16
xxx- x-xx
uuu- u-uu
26h
TXB1EID8
EID15
EID14
EID13
EID12
EID11
EID10
EID9
EID8
xxxx xxxx
uuuu uuuu
27h
TXB1EID0
EID7
EID6
EID5
EID4
EID3
EID2
EID1
EID0
xxxx xxxx
uuuu uuuu
28h
TXB2SIDH
SID10
SID9
SID8
SID7
SID6
SID5
SID4
SID3
xxxx xxxx
uuuu uuuu
29h
TXB2SIDL
SID2
SID1
SID0
—
EXIDE
—
EID17
EID16
xxx- x-xx
uuu- u-uu
2Ah
TXB2EID8
EID15
EID14
EID13
EID12
EID11
EID10
EID9
EID8
xxxx xxxx
uuuu uuuu
2Bh
TXB2EID0
EID7
EID6
EID5
EID4
EID3
EID2
EID1
EID0
xxxx xxxx
uuuu uuuu
© 2007 Microchip Technology Inc.
DS21664D-page 29
MCP2502X/5X
NOTES:
DS21664D-page 30
© 2007 Microchip Technology Inc.
MCP2502X/5X
5.0
GPIO MODULE
5.1
Description
5.2
The MCP2502X/5X has eight general-purpose input/
output pins (GP0 to GP7), collectively labeled GPIO. All
GPIO port pins have TTL input levels and full CMOS
output drivers, with the exception of GP7, which is input
only. Pins GP6:GP0 can be individually configured as
input or output via the GPDDR register.
Note:
The GPDDR register controls the direction
of the GPIO pins, even when they are
being used as analog inputs. The user
must ensure that the bits in the GPDDR
register are maintained set (input) when
using them as analog inputs.
Each of the GPIO pins has a weak internal pull-up
resistor. A single control bit (OPTREG.GPPU) can turn
on/off all the pull-ups. The weak pull-up is automatically
turned off when the port pin is configured as an output.
The pull-ups are disabled during a Power-on Reset.
All pins are multiplexed with an alternate function,
including analog-to-digital conversion on up to four of
the GPIO pins, analog VREF inputs up to two pins, PWM
outputs up to two pins, clock-out function and external
reset. The operation of each pin is selected by clearing,
or setting, control bits in various control registers. GPIO
pin functions are summarized in Table 5-1.
TABLE 5-1:
Name
GPIO FUNCTIONS
Bit
#
All GPIO pins have a digital input edge detection
feature that will automatically transmit a message when
an edge with the proper polarity occurs on any of the
digital inputs. Only pins configured as inputs and
enabled for this function via control register IOINTPO
will perform this operation.
Note:
Refer to Section 7.4 “A/D Threshold
Detection” for information regarding A/D
channels.
Three control registers are associated with this
function. An enable pin for each GPIO pin resides in the
IOINTEN register. When a bit is set to a '1', the
corresponding GPIO pin is enabled to generate a
transmit-on-change message (TXID2) when an edge of
specified polarity occurs.
The digital edge detection function on a GPIO pin
configured as a digital input is edge triggered. A risingedge will generate a transmission if the corresponding
bit in the IOINTPO register is set. A falling-edge will
generate a transmission if the bit is cleared. When a
valid edge appears on the enabled GPIO pin, CAN
message TXID2 is initiated.
The edge-detection function on any given GPIO pin
(configured as a digital input) can wake up the
processor from SLEEP if the corresponding interrupt
enable bit in the IOINTEN register was set prior to
going into SLEEP mode. If a wake-up from SLEEP is
caused in this manner, the device will immediately
initiate a transmit message (TXID2).
Function
GP0/AN0
bit0 I/O or analog input
GP1/AN1
bit1 I/O or analog input
GP2/AN2/PWM2
bit2 I/O, analog input
or PWM out
GP3/AN3/PWM3
bit3 I/O, analog input
or PWM out
GP4/VREF-
bit4 I/O or analog voltage
reference
GP5/VREF+
bit5 I/O or analog voltage
reference
GP6/CLKOUT
bit6 I/O or Clock output
GP7/nRST/VPP
bit7 Input, external reset input
or programming voltage
input
© 2007 Microchip Technology Inc.
Digital Input Edge Detection
DS21664D-page 31
MCP2502X/5X
REGISTER 5-1:
GPDDR - DATA DIRECTION REGISTER
U-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
—
DDR6
DDR5
DDR4
DDR3
DDR2
DDR1
DDR0
bit 7
bit 0
bit 7
Unimplemented: Read as ‘0’
bit 6-0
DDR6:DDR0: Data Direction Register* bits
1 = corresponding GPIO pin is configured as an input
0 = corresponding GPIO pin is configured as an output
* must bet set if corresponding analog channel is enabled (see ADCON1)
Legend:
REGISTER 5-2:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
GPLAT - GPIO OUTPUT REGISTER
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
GP6
GP5
GP4
GP3
GP2
GP1
GP0
bit 7
bit 0
bit 7
Unimplemented: Read as '0’
bit 6-0
GP6:GP0: GPIO Bits
1 = corresponding GPIO pin output latch is a ‘1’
0 = corresponding GPIO pin output latch is a ‘0’
Legend:
REGISTER 5-3:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
IOINTEN REGISTER
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
GP7TXC
GP6TXC
GP5TXC
GP4TXC
GP3TXC
GP2TXC
GP1TXC
GP0TXC
bit 7
bit 7-0
bit 0
GP7TXC:GP0TXC: Transmit-on-change Enable bits
1 = Enable Transmit-On-Change/Compare For Corresponding GPIO/AN Channel
0 = Disable Transmit-On-Change/Compare For Corresponding GPIO/AN Channel
Legend:
DS21664D-page 32
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
© 2007 Microchip Technology Inc.
MCP2502X/5X
REGISTER 5-4:
IOINTPO REGISTER
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
GP7POL
GP6POL
GP5POL
GP4POL
GP3POL
GP2POL
GP1POL
GP0POL
bit 7
bit 7-0
bit 0
GP7POL:GP0POL: Transmit-on-change Polarity bits
1 = Digital Inputs: Low-to-High Transition On Corresponding GPIO Input Pin Generates a
transmit message
Analog Inputs: A/D result above compare value generates a transmit message
0 = Digital Inputs: High-to-Low Transition On Corresponding GPIO Input Generates transmit
message
Analog Inputs: A/D result below compare value generates a transmit message
Legend:
REGISTER 5-5:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
IOINTFL REGISTER
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
GP7TXF
GP6TXF
GP5TXF
GP4TXF
GP3TXF
GP2TXF
GP1TXF
GP0TXF
bit 7
bit 7-0
bit 0
GP7TXF:GP0TXF: Transmit-on-change Polarity bits
1 = Digital Inputs: A valid edge has occurred on the digital input
Analog Inputs: A/D result does exceed the compare threshold
0 = Digital Inputs: A valid edge has not occurred on the digital input
Analog Inputs: A/D result does not exceed the compare threshold
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
© 2007 Microchip Technology Inc.
x = Bit is unknown
DS21664D-page 33
MCP2502X/5X
REGISTER 5-6:
OPTREG1 REGISTER
R/W-1
R/W-1
R/W-1
R/W-1
U-0
R/W-0
R/W-0
R/W-0
GPPU
CLKEN
CLKPS1
CLKPS0
—
CMREQ
AQT1
AQT0
bit 7
bit 0
bit 7
GPPU: Weak pull-up enabled
1 = Weak pull-ups disabled
0 = Weak pull-ups enabled (GP7:GP0)
bit 6
CLKEN:
1 = Clock Out Function disabled
0 = Clock Out Function enabled
bit 5-4
CLKPS1:CLKPS0: CLKOUT Prescaler bits
00 = FOSC/1
01 = FOSC/2
10 = FOSC/4
11 = FOSC/8
bit 3
Reserved:
bit 2
CMREQ: Requests mode of operation (allows mode changes via the CAN bus)
1 = Requests Listen-only mode
0 = Requests Normal mode *
* CMREQ must be cleared as default to avoid device entering Listen-only mode on first “Input”
message.
bit 1-0
AQT1:AQT0: Analog Acquisition Time bits
00 = 64TOSC
01 = 2•(64TOSC)
10 = 4•(64TOSC)
11 = 8•(64TOSC)
(e.g., AQT1:AQT0 => 00 => 2.56 µs for a 25 MHz FOSC)
Legend:
DS21664D-page 34
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
© 2007 Microchip Technology Inc.
MCP2502X/5X
REGISTER 5-7:
OPTREG2 REGISTER
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
CAEN
ERREN
TXONEN
SLPEN
MTYPE
PDEFEN
PUSLP
PUNRM
bit 7
bit 0
bit 7
CAEN: Command Acknowledge Enable bit
1 = Enables the command acknowledge message (TXID1)
0 = Enables the receive overflow message (TXID1)
bit 6
ERREN: Error Recovery Enable bit
1 = MCP2502X/5X will recover into Listen-only mode from bus off
0 = MCP2502X/5X will recover into Normal mode from bus-off
bit 5
TXONEN: Transmit on Error Condition bit(REC or TEC)
1 = Enable, will send message if error counter(s) go high enough
0 = Disable, will NOT send message regardless of error counter values
bit 4
SLPEN: Low power SLEEP mode enable/disable
1 = Device will enter Sleep if bus is idle for at least 1408 bit times
0 = SLEEP mode is disabled
bit 3
MTYPE: Determines if information request messages use RTR or not
1 = RTR is NOT used for IRM (Data Frame)
0 = RTR is used for IRM (Remote Frame)
bit 2
PDEFEN: Enables PWM outputs to return to POR default values when CAN bus communication
is lost
1 = Enables PWM output default values
0 = Disables PWM output default values
bit 1
PUSLP: Allows device to enter SLEEP while in Listen-only mode during power-up sequence
1 = Enables SLEEP when in Listen-only mode during power-up sequence
0 = Disables SLEEP when in Listen-only mode during power-up sequence
bit 0
PUNRM: Enters Normal mode after completing self-configuration during power-up sequence
1 = Enters “Normal” mode after completing self-configuration during power-up sequence
0 = Enables “Listen-only” mode after completing self-configuration during power-up sequence
and waits for an error-free message before switching to Normal mode
Legend:
TABLE 5-2:
Addr
Name
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
SUMMARY OF REGISTERS ASSOCIATED WITH GPIO MODULE
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
Value on
POR
Value on
RST
Bank 0
34h
GPDDR
—
DDR6
DDR5
DDR4
DDR3
DDR2
DDR1
DDR0
00h
IOINTEN
GP7TXC
GP6TXC
GP5TXC
GP4TXC
GP3TXC
GP2TXC
GP1TXC
GP0TXC
0000 0000 0000 0000
01h
IOINTPO
GP7POL
GP6POL
GP5POL
GP4POL
GP3POL
GP2POL
GP1POL
GP0POL
0000 0000 0000 0000
OPTREG1
GPPU
CLKEN
CLKPS1
CLKPS0
—
CMREQ
AQT1
AQT0
0000 ---- 0000 ----
04h
-111 1111 -111 1111
Legend: x = unknown, U = unchanged, - = unimplemented read as ‘0’. Shaded cells are not used by module.
© 2007 Microchip Technology Inc.
DS21664D-page 35
MCP2502X/5X
NOTES:
DS21664D-page 36
© 2007 Microchip Technology Inc.
MCP2502X/5X
6.0
PWM MODULE
6.1
Description
reconfigure to their default conditions. This includes the
PWM module itself being disabled and the GPIO being
forced low, high or tri-state.
There are two Pulse Width Modulation (PWM) modules
(PWM1 and PWM2) that generate up to a 10-bit
resolution output signal on GP2 and GP3, respectively.
Each of these outputs can be separately enabled, with
each having its own associated timer, duty cycle and
period registers for controlling the PWM output shape.
Each PWM module contains a set of master/slave duty
cycle registers, providing up to a 10-bit resolution PWM
output. Figure 6-1 shows a simplified block diagram of
the PWM module. A PWM output has a time base
(period) and a time that the output stays high (duty
cycle), as shown in Figure 6-2. The frequency of the
PWM is the inverse of the period (1/period).
At power-on, the PWM outputs are not enabled until
after the self-configuration sequence has been
completed (i.e., all SRAM registers have been loaded
with their default values) to prevent invalid signals from
occurring on the PWM outputs.
FIGURE 6-1:
Duty cycle
registers
SIMPLIFIED BLOCK
DIAGRAM
TnCON
(2 LSB)
PWMnDCH
FIGURE 6-2:
Period
Duty Cycle
TMRn = PRn
6.2
TMRn = PRn
TMRn=Duty Cycle
PWM Timer Modules
There are two 8-bit timers supporting the two PWM
outputs. Both timers have a prescaler only. The timers
are readable and writable and are cleared on any
device reset or when the timer is turned off.
The input clock (FOSC/4) has a prescale option of 1:1,
1:4 or 1:16, selected by control bits TnCKPS[1:0] in
register TnCON<5:4> (where n corresponds to the
appropriate timer).
Each timer module has an 8-bit period register, PRn.
PRn is a readable and writable register. The timer
module increments from 00h until it matches PRn and
then resets to 00h on the next increment cycle. The
PRn register is set when the device is reset.
Each timer can be shut off by clearing control bit
TMRnON (TnCON<7>).
PWMnDBH
6.2.1
Comparator
TMRn
PWM OUTPUT
Note
1
R
S
Q
GP<Y>
(PWMn)
DDR<Y>
TIMER MODULE PRESCALER
The prescaler counters are cleared when a write to the
TnCON or TMRn register or any device reset (RST
reset or Power-on reset) occurs.
6.3
PWM Modules
Each PWM module contains a set of master/slave duty
cycle registers, providing up to a 10-bit resolution PWM
output. Figure 6-2 shows a simplified block diagram of
the PWM module.
Comparator
Prn
6.3.1
Note 1: 8-bit timer is concatenated with 2-bit internal
Q clock or 2 bits of the prescaler to create
10-bit time base
The PWM outputs can be forced to their default POR
conditions if CAN bus communication is lost and is
enabled via OPTREG2.PDEFEN. The system designer
must implement a hand-shaking protocol, such that the
MCP2505X will receive a valid message into one of the
receive buffers before four successive scheduled
transmissions occur. If a valid message is not received,
the PWM outputs GP2 and GP3 will automatically
© 2007 Microchip Technology Inc.
PWM PERIOD
The PWM period is specified by writing to the PRn
register. The PWM period can be calculated using the
following formula:
PWM period = [ ( PR n ) + 1 ]*4T OSC * ( TMRn prescale value )
PWM frequency = 1 ⁄ ( PWM period )
When TMRn is equal to PRn, the following two events
occur on the next cycle:
• TMRn is cleared
• The PWM duty cycle is latched from PWMnDCH
into PWMnDBH
DS21664D-page 37
MCP2502X/5X
6.3.2
PWM DUTY CYCLE
When the PWMnDBH and 2-bit latch match TMRn
concatenated with an internal 2-bit Q clock or 2 bits of
the TMRn prescaler, the PWM output pin is cleared.
The PWM duty cycle is specified by writing to the
PWMnDCH and TnCON registers. Up to 10-bit
resolution is available. The PWMnDCH contains the
eight MSb’s, while the TnCON register contains the two
LSb’s. This 10-bit value is represented by
PWM1DCH:T1CON<1:0> for PWM Module 1 and
PWM2DCH:T2CON<1:0> for PWM Module 2.
Maximum PWM resolution (bits) for a given PWM
frequency is equal to:
log ( ( F OSC ) ⁄ ( Fpwm ) ) ⁄ ( log ( 2 )bits )
The following equation is used to calculate the PMW
duty cycle:
Note:
If the PWM duty cycle value is longer than
the PWM period (PWM duty cycle
= 100%), the PWM output pin will not be
cleared.
PWMDC = ( PWMnDC ) *T OSC *TMRn (prescale)
In order to achieve higher resolution, the PWM
frequency must be decreased. In order to achieve
higher PWM frequency, the resolution must be
decreased. Table 6-1 lists example PWM frequencies
and resolutions for FOSC = 20 MHz. TMRn prescaler
and PRn values are also shown.
PWMnDCH can be written to at any time, but the duty
cycle value is not latched into PWMnDBH until after a
match between PRn and TMRn occurs (i.e., the period
is complete).
The PWMnDBH register and 2-bit internal latch are
used to double-buffer the PWM duty cycle. This
double-buffering is essential for glitchless PWM
operation.
TABLE 6-1:
PWM FREQUENCIES AND RESOLUTIONS AT 20 MHZ
PWM Frequency
1.22 kHz
4.88 kHz
19.53 kHz
16
4
1
1
1
1
0xFF
0xFF
0xFF
0x3F
0x1F
0x17
10
10
10
8
7
5.5
Timer Prescaler (1, 4, 16)
PRn Value
Maximum Resolution (bits)
REGISTER 6-1:
78.12 kHz 156.30 kHz 208.30 kHz
PWM1 DUTY CYCLE REGISTER MSB (PWM1DCH)
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
DC1B9
DC1B8
DC1B7
DC1B6
DC1B5
DC1B4
DC1B3
DC1B2
bit 7
bit 7-0
bit 0
DC1B9:DC1B2: Most Significant PWM0 Duty Cycle bits
Legend:
REGISTER 6-2:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
PWM2 DUTY CYCLE REGISTER MSB (PWM2DCH)
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
DC2B9
DC2B8
DC2B7
DC2B6
DC2B5
DC2B4
DC2B3
DC2B2
bit 7
bit 7-0
bit 0
DC2B9:DC2B2: Most Significant PWM2 Duty Cycle bits
Legend:
DS21664D-page 38
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
© 2007 Microchip Technology Inc.
MCP2502X/5X
REGISTER 6-3:
T1CON: TIMER1 CONTROL REGISTER
R/W-0
U-0
TMR1ON
—
R/W-0
R/W-0
T1CKPS1 T1CKPS0
U-0
U-0
R/W-x
R/W-x
—
—
DC1B1
DC1B0
bit 7
bit 0
bit 7
TMR1ON: Timer1 On bit
1 = Enables Timer1
0 = Disables Timer1
bit 6
Unimplemented: Read as '0'
bit 5-4
T1CKPS1:T1CKPS0: Timer1 Clock Prescale Select bits
00 = Prescaler is 1
01 = Prescaler is 4
1x = Prescaler is 16
bit 3-2
Unimplemented: Read as '0'
bit 1-0
DC1B1:DC1B0: Least Significant PWM1 Duty Cycle bits
Legend:
REGISTER 6-4:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
T2CON: TIMER2 CONTROL REGISTER
R/W-0
U-0
TMR2ON
—
R/W-0
R/W-0
T2CKPS1 T2CKPS0
U-0
U-0
R/W-x
R/W-x
—
—
DC2B1
DC2B0
bit 7
bit 7
bit 0
TMR2ON: Timer2 On bit
1 = Enables Timer2
0 = Disables Timer2
bit 6
Unimplemented: Read as '0'
bit 5-4
T2CKPS1:T2CKPS0: Timer2 Clock Prescale Select bits
00 = Prescaler is 1
01 = Prescaler is 4
1x = Prescaler is 16
bit 3-2
Unimplemented: Read as '0'
bit 1-0
DC2B1:DC2B0: Least Significant PWM2 Duty Cycle bits
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
© 2007 Microchip Technology Inc.
x = Bit is unknown
DS21664D-page 39
MCP2502X/5X
REGISTER 6-5:
PR1: PERIOD REGISTER
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
PR1B7
PR1B6
PR1B5
PR1B4
PR1B3
PR1B2
PR1B1
PR1B0
bit 7
bit 7-0
bit 0
PR1B7:PR1B0: PWM1 Period Register bits
Legend:
REGISTER 6-6:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
PR2: PERIOD REGISTER
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
PR2B7
PR2B6
PR2B5
PR2B4
PR2B3
PR2B2
PR2B1
PR2B0
bit 7
bit 7-0
bit 0
PR2B7:PR2B0: PWM2 Period Register bits
Legend:
TABLE 6-2:
Addr
Name
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
REGISTERS ASSOCIATED WITH THE PWM MODULE
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
Value on
POR
Value on
RST
34h
GPDDR
—
DDR6
DDR5
DDR4
DDR3
DDR2
DDR1
DDR0
-111 1111 -111 1111
05h
T1CON
TMR1ON
—
T1CKPS1
T1CKPS0
—
—
DC1B1
DC1B0
0-00 --xx 0-00 --uu
06h
T2CON
TMR2ON
—
T2CKPS1
T2CKPS0
—
—
DC2B1
DC2B0
0-00 --xx 0-00 --uu
07h
PR1
Timer 1 Module’s Period Register
1111 1111 1111 1111
08h
PR2
Timer 2 Module’s Period Register
1111 1111 1111 1111
09h
PWM1DCH
DC1B9
DC1B8
DC1B7
DC1B6
DC1B5
DC1B4
DC1B3
DC1B2
xxxx xxxx uuuu uuuu
0Ah
PWM2DCH
DC2B9
DC2B8
DC2B7
DC2B6
DC2B5
DC2B4
DC2B3
DC2B2
xxxx xxxx uuuu uuuu
Legend: x = unknown, U = unchanged, - = unimplemented read as ‘0’. Shaded cells are not used by module.
DS21664D-page 40
© 2007 Microchip Technology Inc.
MCP2502X/5X
7.0
ANALOG-TO-DIGITAL
CONVERTER (A/D) MODULE
7.1
Description
The Analog-to-Digital (A/D) module is a four-channel,
10-bit successive approximation type of A/D. The A/D
allows conversion of an analog input signal to a
corresponding 10-bit number. The four channels are
multiplexed on the GP[3:0] pins. The converter is
turned off/on via the ADCON0 register and each
channel is individually enabled via the ADCON1 control
register. The VREF+ and VREF- sources are userselectable as internal or external. Each channel can be
set to one of two conversion modes:
1.
2.
Auto-conversion
Convert-on-request.
7.2
A/D Module Registers
The A/D module itself has several registers. The
registers are:
•
•
•
•
•
A/D Control Register 0 (ADCON0)
A/D Control Register 1 (ADCON1)
Transmit-on-Change Register (IOINTEN)
Compare and Polarity Register (ADCMPnL)
A/D Result Registers (ADRESnL, ADRESnH)
7.3
A/D Conversion Modes
There are two modes of conversion that can be
individually selected for each analog channel that has
been enabled. These are auto-conversion and
conversion-on-request.
7.3.1
AUTO-CONVERSION MODE
If the Auto-conversion mode is selected (STCON), an
A/D conversion is performed sequentially for each
channel that has been set to Analog Input mode and
has been configured for Auto-conversion mode.
Conversion starts with AN0 and is immediately
followed by AN1, etc. Once the conversion has
completed, the value is stored in the analog channel
registers for the respective channel.
The rate of the auto-conversion is determined by a
timer and prescaler. The formula for determining
conversion rates is:
( T OSC ) ( 1024 ) ( Prescaler rate )
Typical conversion rates with a 20 MHz oscillator input
are shown in Table 7-1.
TABLE 7-1:
AUTO-CONVERSION RATES
FOR GIVEN PRESCALE
RATES AT 20 MHZ
The ADCON0 register controls the operation of the
A/D module, including auto-conversion rate and enable
bit. The ADCON1 register enables the A/D function on
port pins GP3:GP0, A/D conversion rate and selects
the voltage reference source. The IOINTEN register’s
four least significant bits enable/disable the transmiton-change function. The ADCMPnL.ADPOL bit sets
the polarity (above or below threshold) for the transmiton-change function.
TOPS[2:0]
Prescale
Rate
000
1:1
51 µs
001
1:8
410 µs
010
1:32
2 ms
011
1:128
7 ms
100
1:512
26 ms
101
1:1024
52 ms
The result of an A/D conversion is made available to
the user within the data field of the Read A/D Registers
output message via the CAN bus. This message can
be directly requested by another CAN node or be
automatically transmitted (TXIDO), as has been
described previously.
110
1:2048
105 ms
111
1:4096
210 ms
Additionally, the individual channel results may be read
using the “Read Register” command as described in
Section 4.3.1 “Information Request Messages” and
as shown in Table 3-2 by addressing the appropriate
A/D result register (ADRESnL and ADRESnH).
Note:
Auto-Conversion
Rate
The timer is turned on if one of the GPnTXC bits are set
in the IOINTEN register and configured as analog
input.
The prescaler counter is cleared when the device is
reset (RST reset or Power-on reset).
The GPDDR register controls the direction
of the GPIO pins, even when they are
being used as analog inputs. The user
must ensure that the bits in the GPDDR
register are maintained set (input) when
using them as analog inputs.
© 2007 Microchip Technology Inc.
DS21664D-page 41
MCP2502X/5X
7.3.2
CONVERSION-ON-REQUEST
MODE
7.4
If the Conversion-on-request mode is selected, the
device performs an A/D conversion only after receiving
a Read A/D Registers or Read Register Receive
message (IRM). In the case of the Read A/D Registers
command, all of the GPIO pins that have been
configured as analog input channels will have an A/D
conversion done before the data frame is sent. When a
Read Register Receive message is initiated (extended
message format only), the A/D conversion is performed
when the MSB of the analog channel is requested, with
the MSB result being transferred. A subsequent read of
the LSB will transmit the value latched when the MSB
was requested (it is recommended that the Read A/D
Registers receive message is used to obtain complete
analog channel values in one message).
REGISTER 7-1:
A/D Threshold Detection
Once an A/D auto-conversion has been completed, the
A/D channel result(s) can be compared to a value
stored in the associated A/D channel comparator
registers.
If the value in the analog channel result registers (i.e.,
AN0L and AN10H registers for analog channel 0) is
lower or higher than the value in the A/D comparator
registers (as specified by a corresponding polarity bit),
a transmit-on-change message will be sent (TXID2).
The threshold-detection function for all analog
channels is bit-selectable.
If the A/D channel has been configured for transmit-onchange mode, the MCP2505 will send a transmit
message with the appropriate data. It is possible that
more than one A/D channel has a change-of-state
condition. This does not pose a problem since all
analog channel data is provided in the transmit
message.
A/D MODULE RESULT REGISTER MSB (ADRESNH)
R-x
R-x
R-x
R-x
R-x
R-x
R-x
R-x
AD9
AD8
AD7
AD6
AD5
AD4
AD3
AD2
bit 7
bit 7-0
bit 0
AD9:AD2: Most Significant A/D Result bits
Legend:
REGISTER 7-2:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
A/D MODULE RESULT REGISTER LSB (ADRESNL)
R-x
R-x
U-0
U-0
U-0
U-0
U-0
U-0
AD1
AD0
—
—
—
—
—
—
bit 7
bit 0
bit 7-6
AD1:AD0: Least significant A/D Result bits
bit 5-0
Unimplemented: Reads as ‘0’
Legend:
DS21664D-page 42
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
© 2007 Microchip Technology Inc.
MCP2502X/5X
REGISTER 7-3:
A/D MODULE COMPARE REGISTER MSB (ADCMPNH)
R/W-x
R/W-x
R/W-x
R/W-x
ANnCMP9 ANnCMP8 ANnCMP7 ANnCMP6
R/W-x
R/W-x
ANnCMP5
R/W-x
R/W-x
ANnCMP4 ANnCMP3 ANnCMP2
bit 7
bit 7-0
bit 0
ANnCMP9:ANnCMP2: Most Significant A/D Compare bits
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
REGISTER 7-4:
x = Bit is unknown
A/D MODULE COMPARE REGISTER LSB (ADCMPNL)
R/W-x
R/W-x
ANnCMP1 ANnCMP0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
bit 7
bit 0
bit 7-6
ANnCMP1:ANnCMP0: Least Significant A/D Compare bits
bit 5-0
Unimplemented: Reads as ‘0’
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
REGISTER 7-5:
x = Bit is unknown
ADCON0 REGISTER
R/W-0
R/W-0
R/W-0
R/W-0
U-x
U-0
U-x
U-x
ADON
T0PS2
T0PS1
T0PS0
—
—
—
—
bit 7
bit 0
bit 7
ADON: A/D On Bit
1 = A/D converter module is operating
0 = A/D converter module is shut off and consumes no operating current
bit 6-4
T0PS2:T0PS0: Timer0 Prescaler Rate Select bits (used for auto-conversions)
000 = 1:1 Prescaller Rate
001 = 1:8 Prescaller Rate
010 = 1:32 Prescaller Rate
011 = 1:128 Prescaller Rate
100 = 1:512 Prescaller Rate
101 = 1:1024 Prescaller Rate
110 = 1:2048 Prescaller Rate
111 = 1:4096 Prescaller Rate
Formula: (TOSC)(1024) (Prescaler Rate)
bit 3
Reserved
bit 2
Unimplemented: Reads as ‘0’
bit 1-0
Reserved
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
© 2007 Microchip Technology Inc.
x = Bit is unknown
DS21664D-page 43
MCP2502X/5X
REGISTER 7-6:
ADCON1 REGISTER
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
ADCS1
ADCS0
VCFG1
VCFG0
PCFG3
PCFG2
PCFG1
PCFG0
bit 7
bit 0
bit 7-6
ADCS1:ADCS0: A/D Conversion Select bits
00 = FOSC/2
01 = FOSC/8
10 = FOSC/32
11 = Reserved
bit 5-4
VCFG1:VCFG0: Voltage Reference Configuration bits
bit 3-0
VCFG1:VCFG0
A/D VREF+
A/D VREF-
00
VDD
VSS
01
External VREF+
VSS
10
VDD
External VREF-
11
External VREF+
External VREF-
PCFG3:PCFG0: A/D Port Configuration Control bits*
1 = Corresponding GPIO pin configured as Digital I/O
0 = Corresponding GPIO pin configured as A/D Input
* corresponding data direction bit (GPDDR register) must be set for each enabled analog
channel.
Legend:
DS21664D-page 44
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
© 2007 Microchip Technology Inc.
MCP2502X/5X
7.5
Read A/D Registers Output
Message
When the MCP2502X/5X responds to a Read A/D Regs
IRM with an OM, the analog values are contained in
Register 7-7, Register 7-8 and Register 7-9.
REGISTER 7-7:
A/D OM RESULT REGISTER (ANnH)
R-x
R-x
R-x
R-x
R-x
R-x
R-x
R-x
ANnR9
ANnR8
ANnR7
ANnR6
ANnR5
ANnR4
ANnR3
ANnR2
bit 7
bit 7-0
bit 0
ANnR9:ANnR2: Bits 9-2 of channel ‘n’ results
Legend:
REGISTER 7-8:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
A/D OM RESULT REGISTER (AN32L)
R-x
R-x
U-x
U-x
R-x
R-x
U-x
U-x
AN3R.1
AN3R.0
—
—
AN2R.1
AN2R.0
—
—
bit 7
bit 0
bit 7-6
AN3R.1:AN3R.0: A/D Channel 3, bits 1:0 results
bit 5-4
Unimplemented: Reads as ‘0’
bit 3-2
AN2R.1:AN2R.0: A/D Channel 2, bits 1:0 results
bit 1-0
Unimplemented: Reads as ‘0’
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
© 2007 Microchip Technology Inc.
x = Bit is unknown
DS21664D-page 45
MCP2502X/5X
REGISTER 7-9:
A/D OM RESULT REGISTER (AN10L)
R-x
R-x
U-x
U-x
R-x
R-x
U-x
U-x
AN1R.1
AN1R.0
—
—
AN0R.1
AN0R.0
—
—
bit 7
bit 0
bit 7-6
AN1R.1:AN1R.0: A/D Channel 1, bits 1:0 results
bit 5-4
Unimplemented: Reads as ‘0’
bit 3-2
AN0R.1:AN0R.0: A/D Channel 0, bits 1:0 results
bit 1-0
Unimplemented: Reads as ‘0’
Legend:
TABLE 7-2:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
REGISTERS ASSOCIATED WITH THE A/D MODULE
Value on
POR
Value on
RST
Addr
Name
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
1Eh
GPPIN
GP7
GP6
GP5
GP4
GP3
GP2
GP1
GP0
0000 0000 0000 0000
34h
GPDDR *
—
DDR6
DDR5
DDR4
DDR3
DDR2
DDR1
DDR0
-111 1111 -111 1111
00h
IOINTEN
GP7TXC
GP6TXC
GP5TXC
GP4TXC
GP3TXC
GP2TXC
GP1TXC
GP0TXC
0000 0000 0000 0000
01h
IOINTPO
GP7POL
GP6POL
GP5POL
GP4POL
GP3POL
GP2POL
GP1POL
GP0POL
0000 0000 0000 0000
0Eh
ADCON0
ADON
T0PS2
T0PS1
T0PS0
GO/DONE
—
CHS1
CHS0
0000 0-00 0000 0-00
PCFG0
0000 0000 0000 0000
0Fh
ADCON1
ADCS1
ADCS0
VCFG1
VCFG0
PCFG3
PCFG2
PCFG1
2Ch
ADCMP3
AN3CM
AN3CMP.
AN3CMP.
AN3CMP.
AN3CMP.5
AN3CMP.4
AN3CMP.
AN3CMP2 xxxx xxxx uuuu uuuu
2Dh
ADCMP3
AN3CM
AN3CMP.
—
—
2Eh
ADCMP2
AN2CM
AN2CMP.
AN2CMP.
AN2CMP.
AN2CMP.5
AN2CMP.4
AN2CMP.
AN2CMP2 xxxx xxxx uuuu uuuu
2Fh
ADCMP2
AN2CM
AN2CMP.
—
—
30h
ADCMP1
AN1CM
AN1CMP.
AN1CMP.
AN1CMP.
AN1CMP.5
AN1CMP.4
AN1CMP.
AN1CMP2 xxxx xxxx uuuu uuuu
31h
ADCMP1
AN1CM
AN1CMP.
—
—
32h
ADCMP0
AN0CM
AN0CMP.
AN0CMP.
AN0CMP.
AN0CMP.5
AN0CMP.4
AN0CMP.
AN0CMP2 xxxx xxxx uuuu uuuu
33h
ADCMP0
AN0CM
AN0CMP.
—
—
10h
STCON
STEM
STMS
STBF1
STBF0
*
Reserved
ADPOL
Reserved
ADPOL
Reserved
ADPOL
Reserved
STM3
STM2
STM1
xx-- ---- uu-- ----
xx-- ---- uu-- ----
xx-- ---- uu-- ----
—
xx-- ---- uu-- ----
STM0
0xxx xxxx 0uuu uuuu
The GPDDR register controls the direction of the GPIO pins, even when they are being used as analog inputs. The user must ensure
that the bits in the GPDDR register are maintained set (input) when using them as analog inputs.
DS21664D-page 46
© 2007 Microchip Technology Inc.
MCP2502X/5X
8.0
SPECIAL FEATURES OF THE
MCP2502X/5X
8.1
Description
There are a number of special circuits in the
MCP2502X/5X that deal with the needs of real-time
applications. These features are intended to maximize
system reliability, minimize cost through elimination of
external components and provide power-saving
operating modes. These are:
• Oscillator selection
• Reset
- Power-on Reset (POR)
- Power-up Timer (PWRT)
- Oscillator Start-up Timer (OST)
• SLEEP
• In-Circuit Serial Programming
FIGURE 8-2:
Clock from
ext. System
OSC1
MCP2505X
Open
8.2
Several oscillator options are offered to allow the
device to fit the application. XT and HS modes allow
the device to support a wide range of crystal
frequencies while the LP crystal option saves power.
EXTERNAL CLOCK INPUT
OPERATION
OSC2
Configuration Bits
The configuration bits can be either programmed (read
as ‘0’) or unprogrammed (read as ‘1’) to select various
device configurations. These bits are mapped in
program memory location 2007h. The configuration
register is actually beyond program memory space and
belongs to the special test/configuration memory space
(2000h-3FFFh) that can be accessed only during
programming.
Two timers are implemented to offer necessary delays
on power-up. One is the Oscillator Start-up Timer
(OST), intended to keep the device in reset until the
crystal oscillator is stable. The other is the Power-up
Timer (PWRT), which provides a fixed delay of 72 ms
(nominal) on power-up only, designed to keep the part
in reset while the power supply stabilizes. With these
two timers on-chip, most applications need no external
reset circuitry.
8.3
SLEEP mode is designed to offer a very low current
power-down mode. The user can wake-up from SLEEP
through external reset, transmit-on-change or CAN bus
activity.
A set of configuration bits are used to select various
options.
In all modes, a crystal or ceramic resonator is
connected to the OSC1/CLKIN and OSC2/CLKOUT
pins to establish oscillation (Figure 8-1). The oscillator
design requires the use of a parallel-cut crystal. The
device can also have an external clock source to drive
the OSC1/CLKIN pin (Figure 8-2).
FIGURE 8-1:
The device will default to HS mode if the CONFIG
register is not programmed.
CRYSTAL/CERAMIC
RESONATOR
OPERATION
OSC1
Four different oscillator modes may be selected. The
user
can
program
two
configuration
bits
(FOSC1:FOSC0) in the CONFIG register to select one of
these modes:
• LP = Low-Power Crystal
• XT = Crystal/Resonator
• HS = High-speed Crystal Resonator
TO INTERNAL
LOGIC
C1
XTAL
Oscillator Configurations
RF
SLEEP
OSC2
C2
© 2007 Microchip Technology Inc.
MCP2505X
DS21664D-page 47
MCP2502X/5X
REGISTER 8-1:
CONFIGURATION REGISTER
U-0
U-0
R/W-x
R/W-x
R/W-x
R/W-x
—
—
R
R
R
R
bit 13
bit 8
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W
R/W
R/W
R
R
R
R
R
RSTEN
FOSC1
FOSC0
bit 7
bit 0
bit 13-11
Unimplemented: Read as '0'
bit 10-3
Reserved: do not attempt to modify
bit 2
RSTEN: Enable RST input on GP7
1 = RST input Enabled
0 = RST input Disabled
bit 1-0
FOSC1:FOSC0: Oscillator Selection bits
11 = HS oscillator
10 = Reserved for Test (EC oscillator)
01 = XT oscillator
00 = LP oscillator
Legend:
8.4
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
Reset
The MCP2502X/5X differentiates between two kinds of
reset:
• Power-on Reset (POR)
• External RST reset
Some registers are not affected in any reset condition.
Their status is unknown on POR and unchanged in any
other reset. Most other registers are reset to a reset
state on Power-on Reset (POR), on RST and on RST
during SLEEP. They are not affected by a wake-up from
SLEEP, which is viewed as the resumption of normal
operation. A simplified block diagram of the on-chip
reset circuit is shown in Figure 8-3. The MCP2502X/5X
has a RST noise filter in the RST reset path. The filter
will detect and ignore small pulses.
DS21664D-page 48
8.4.1
x = Bit is unknown
POWER-ON RESET
A Power-on Reset pulse is generated on-chip when
VDD rise is detected (in the range of 1.5V to 2.1V). If the
RST input on the GP7 pin is selected, the RST pin may
be tied through a series resistor to VDD, eliminating the
need for external RC components usually required for
a Power-on Reset. A maximum rise time for VDD is
specified in Section 9.0 “Electrical Characteristics”
of this document.
When the device starts normal operation (exits the
reset condition), device operating parameters (voltage,
frequency, temperature, etc.) must be met to ensure
proper operation. For additional information, refer to
AN607, “Power-up Troubleshooting”, DS00607).
© 2007 Microchip Technology Inc.
MCP2502X/5X
FIGURE 8-3:
SIMPLIFIED BLOCK DIAGRAM OF ON-CHIP RESET CIRCUIT
RST
VDD Rise
Detect
Power-on Reset
S
VDD
OST
Q Chip Reset
10-bit Ripple Counter
OSC1
On-chip
RC OSC
PWRT
10-bit Ripple Counter
Enable PWRT
Enable OST
8.4.2
POWER-UP TIMER
The Power-up Timer (PWRT) provides a fixed, 72 ms
nominal time-out, on power-up only, from the POR. The
Power-up Timer operates on an internal RC oscillator,
with the device being kept in reset as long as the PWRT
is active. The PWRT's time delay allows VDD to rise to
an acceptable level. The power-up time delay will vary
from device to device due to VDD, temperature and
process variation. For more information, please see
Section 9.2 “DC Characteristics”.
8.5
Oscillator Start-up Timer
The Oscillator Start-up Timer (OST) provides a 512
oscillator cycle (TOSC) delay after the PWRT delay is
complete. This ensures that the crystal oscillator has
started and stabilized and must be less than the total
time it takes (704 oscillator cycles or 44 TQ) for the
minimum standard data frame or remote transmit
message to be completed on the CAN bus once a
wake-up from SLEEP occurs. The OST time-out is
invoked only on Power-on Reset or wake-up from
SLEEP.
8.6
Power-down Mode (SLEEP)
Power-down mode (or SLEEP) is enabled via the
SLPEN bit in the OPTREG2 register. When enabled,
the MCP2502X/5X will enter SLEEP once the CAN bus
has been idle for a minimum 1408 bit times while in
Normal mode.
as a valid message before entering Normal mode. This
feature is enabled via the PUSLP bit in the OPTREG2
register.
While in SLEEP, the I/O ports maintain the status they
had before the SLEEP instruction was executed
(driving high, low or hi-impedance).
The following operations will not function while the
device is in SLEEP:
•
•
•
•
•
A/D Module data conversion
Auto-conversion mode
Auto-messaging
PWM module and outputs
Clock output
8.6.1
WAKE-UP FROM SLEEP
The MCP2502X/5X can wake-up from SLEEP through
one of the following events:
• External reset input on RST pin
• Transmit-on-change due to edge detected on
GPIO pin
• Activity detected on CAN bus
For the device to wake-up due to a GPIO transmit-onchange, the corresponding interrupt enable bit must be
set (enabled). Wake-up occurs regardless of the state
of the GIE bit.
If a wake-up from SLEEP is caused by activity on the
CAN bus, the message that caused the wake-up will not
be received or acknowledged by the MCP2502X/5X.
Additionally, the device may be configured to enter
SLEEP while in Listen-only mode immediately after
power-up if there is no activity on the CAN bus.
Subsequent CAN bus activity will wake the device up
from SLEEP and the NEXT message will be confirmed
© 2007 Microchip Technology Inc.
DS21664D-page 49
MCP2502X/5X
8.7
In-Circuit Serial Programming
The MCP2502X/5X can be serially programmed while
in the end application circuit. This is simply done with
two lines for clock and data, and three other lines for
power, ground and the programming voltage. This
allows customers to manufacture boards with
unprogrammed devices and then program the device
just before shipping the product, also allowing the
most recent firmware (or a custom firmware) to be
programmed.
The device is placed into a program/verify mode by
holding the GP4 and GP5 pins low while raising GP7
(VPP) pin from VIL to VIH (see the MCP2502X/5X
programming specification, “MCP250XX In-Circuit
Serial Programming™ (ICSP)”, DS20072, for more
information). GP4 becomes the programming data and
GP5 becomes the programming clock. Both GP4 and
GP5 are Schmitt Trigger inputs in this mode. The signal
definitions are summarized in Table 8-1
TABLE 8-1:
IN-CIRCUIT SERIAL
PROGRAMMING PIN
FUNCTIONS
Pin Name
Pin
Number
Programming Mode
Function
VSS
7
Ground
GP4
5
Data
GP5
6
Clock
GP7
11
VPP
VDD
14
Power
DS21664D-page 50
© 2007 Microchip Technology Inc.
MCP2502X/5X
9.0
ELECTRICAL CHARACTERISTICS
9.1
Absolute Maximum Ratings†
Ambient temperature under bias.............................................................................................................-55°C to +125°C
Storage temperature ...............................................................................................................................-65°C to +150°C
Voltage on any pin with respect to Vss (except VDD and RST)....................................................... -0.3V to (VDD + 0.6V)
VDD ................................................................................................................................................................... 0V to 7.0V
Voltage on RST with respect to Vss.................................................................................................................. 0V to 14V
Total power dissipation (Note 1) ..............................................................................................................................1.0 W
Maximum source current out of VSS pin ...............................................................................................................300 mA
Maximum sink current into VDD pin.......................................................................................................................250 mA
Input clamp current, Iik (Vi < 0 or Vi > VDD) .......................................................................................................... ±20 mA
Output clamp current, Iok (VO < 0 or VO > VDD).................................................................................................... ±20 mA
Maximum current sunk by any I/O pin.....................................................................................................................25 mA
Maximum current sourced by any input pin ............................................................................................................25 mA
Maximum current sunk by GPIO port....................................................................................................................200 mA
Maximum current sourced by GPIO port ..............................................................................................................200 mA
Soldering temperature of leads (10 seconds) ....................................................................................................... +300°C
ESD protection on all pins .................................................................................................................................................. ≥ 3.5 kV
Note 1: Power dissipation is calculated as follows: Pdis = VDD x {IDD - ∑ IOH} + ∑ {(VDD-VOH) x IOH} + ∑(VOL x IOL)
† NOTICE: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the
device. This is a stress rating only and functional operation of the device at those or any other conditions above those
indicated in the operation listings of this specification is not implied. Exposure to maximum rating conditions for
extended periods may affect device reliability.
FIGURE 9-1:
MCP2505X VOLTAGE-FREQUENCY GRAPH
6.0V
5.5V
5.0V
MCP2505X
Voltage
4.5V
4.5V
4.0V
3.5V
3.0V
2.7V
2.0V
25 MHz
8 MHz
Frequency
Fmax = (9.44 MHz/V) (VDDAPPMIN - 2.7V) + 8 MHz
Note: VDDAPPMIN is the minimum voltage of the MCP2505X device in the application.
Characterized and not 100% tested.
© 2007 Microchip Technology Inc.
DS21664D-page 51
MCP2502X/5X
9.2
DC Characteristics
Industrial (I):
TAMB = -40°C to +85°C VCC = 2.7V to 5.5V
Automotive (E): TAMB = -40°C to +125°C VCC = 4.5V to 5.5V
DC Characteristics
Param.
No.
Sym
VDD
Characteristics
Supply Voltage
SVDD VDD Rise Rate to ensure
internal power-on reset signal
Min
Max
Units
Test Conditions
2.7
4.5
5.5
5.5
V
V
XT and LP OSC configuration
HS OSC configuration (Note 2)
0.05
—
V/ms
(Note 3)
High-level input voltage
VIH
GPIO pins
2
VDD+0.3
V
VIH
RXCAN (Schmitt Trigger)
.7 VDD
VDD
V
OSC1
.85 VDD
VDD
V
Low-level input voltage
—
VIL
RXCAN (Schmitt Trigger)
VSS
0.2 VDD
V
VIL
GPIO pins
-0.3
0.5V
V
OSC1
VSS
0.2 VDD
V
—
0.6
Low-level output voltage
VOL
TXCAN GPIO pins
High-level output voltage
VOH
TXCAN, GPIO pins
V
IOL = 8.5 mA, VDD = 4.5V
V
VDD -0.7
—
V
All I/O except OSC1, GP7
-1
+1
µA
OSC1, GP7 pin
-5
+5
µA
pF
IOH =-3.0 mA, VDD = 4.5V,
I-temp
Input leakage current
ILI
Note 1:
2:
3:
CINT
Internal Capacitance
(all inputs and outputs, except
GP7)
—
7
GP7
—
15
pF
IDD
Operating Current
—
20
mA
XT OSC VDD = 5.5V;
FOSC = 25 MHz
IDDS
Standby Current
(CAN Sleep Mode)
—
30
µA
Inputs tied to VDD or VSS
TAMB = 25°C, fC = 1.0 MHz,
VDD = 5.0V (Note 3)
This is the limit to which VDD can be lowered in SLEEP mode without losing RAM data.
Refer to Figure 9-1.
This parameter is periodically sampled and not 100% tested.
DS21664D-page 52
© 2007 Microchip Technology Inc.
MCP2502X/5X
9.3
AC Characteristics
Industrial (I):
TAMB = -40°C to +85°C VCC = 2.7V to 5.5V
Automotive (E): TAMB = -40°C to +125°C VCC = 4.5V to 5.5V
AC Characteristics
Param.
No.
Sym
FOS
FOS
1
TOSC
Characteristics
CLKIN Frequency
Oscillator Frequency
CLKIN Period
Oscillator Period
3
TOSL
CLKIN High or Low Time
TOSH
4
10
Tosr
CLKIN Rise or Fall Time
TDCLKOUT CLKOUT Propagation Delay
Min
Max
Units
Test Conditions
DC
4
MHz
XT osc mode
DC
25
MHz
HS osc mode (Note 3)
DC
200
kHz
LP osc mode
0.1
4
MHz
XT osc mode
4
25
MHz
HS osc mode (Note 3)
5
200
kHz
LP osc mode
250
—
ns
XT osc mode
40
—
ns
HS osc mode
5
—
µs
LP osc mode
0.25
10
µs
XT osc mode
40
250
ns
HS osc mode
5
—
µs
LP osc mode
100
—
ns
XT osc mode
15
—
ns
HS osc mode
2.5
—
µs
LP osc mode
—
25
ns
XT osc mode (Note 1)
—
50
ns
HS osc mode (Note 1)
—
15
ns
LP osc mode (Note 1)
—
60
ns
VDD = 4.5 V (Note 2)
12
TCKR
CLKOUT Rise Time
—
100
ns
Note 2
13
TCKR
CLKOUT Fall Time
—
200
ns
Note 2
20
TIOR
Port output rise time
—
40
ns
Note 1
21
TIOF
Port output fall time
—
40
ns
Note 1
30
TMCL
RST Pulse Low
2
—
µs
32
TOST
Oscillation Start-up Timer
512
—
Tosc
33
TPWRT
Power-up Timer
28
132
ms
VDD = 5V
34
TIOZ
I/O Hi-impedance from RST
low
—
2.1
µs
Note 1
TPWMR
PWM output rise time
—
25
ns
Note 1
TPWMF
PWM output fall time
—
25
ns
Note 1
TAD
TCNV
Note 1:
2:
3:
A/D clock period
Conversion Time (not
including acquisition time)
VDD = 5V
TOSC = OSC1 period
1.6
—
µs
VREFΔ ≥ 2.5V
3.0
—
µs
VREF full range
—
13
TAD
This parameter is periodically sampled and not 100% tested.
Measurements are taken with CLKOUT output configured as 4 x TOSC.
Refer to Figure 9-1.
© 2007 Microchip Technology Inc.
DS21664D-page 53
MCP2502X/5X
FIGURE 9-2:
I/O TIMING
OSC1
I/O Pin
(input)
I/O Pin
(output)
New Value
Old Value
10
20, 21
13
12
Note: All tests must be done with specified capacitive loads (see data sheet) 50 pF on I/O pins.
FIGURE 9-3:
RESET, OST AND POWER-UP-TIMER
VDD
MCLR
30
Internal
POR
PWRT
Time-out
33
32
OSC
Time-out
Internal
RESET
34
34
I/O Pins
DS21664D-page 54
© 2007 Microchip Technology Inc.
MCP2502X/5X
9.4
A/D Converter Characteristics
AC Converter Characteristics
Param.
No.
Sym
Min
Max
A/D resolution
—
10-bits
NINT
A/D Integral error
—
less than
±1 LSb
VREF+ = VDD = 5.12V,
VSS- = VSS = 0 V (I TEMP)
NDIF
A/D Differential error
—
less than
±1 LSb
VREF+ = VDD = 5.12V,
VSS- = VSS = 0 V (I TEMP)
NG
A/D Gain error
—
less than
±1 LSb
VREF+ = VDD = 5.12V,
VSS- = VSS = 0 V
NOFF
A/D Offset error
—
less than
±2 LSb
VREF+ = VDD = 5.12V,
VSS- = VSS = 0 V
Monotonicity
—
—
NR
Note:
Characteristics
Industrial (I):
TAMB = -40°C to +85°C VCC = 2.7V to 5.5V
Automotive (E): TAMB = -40°C to +125°C VCC = 4.5V to 5.5V
Units
Test Conditions
VREF = VDD = 5.12V, VSS ≤ in
≤VREF
VSS ≤ in ≤VREF
VREF
Reference Voltage
4.096
VDD+0.3
V
Absolute minimum to ensure
10-bit accuracy.
VREF+
Reference V high
VREF-
VDD+0.3
V
Minimum resolution for A/D is
1 mV.
VREF-
Reference V low
VSS-0.3
VREF+
V
Minimum resolution for A/D is
1 mV.
VAIN
Analog input V
VREF-
VREF+
V
ZAIN
Recommended impedance
of analog voltage source
—
2.5
kΩ
IREF
VREF input current
—
10
µA
NHYS
Analog Transmit-on-change
Hysteresis
—
2 LSb
Note
Specified by design (see
Section 4.5.2.1 “Hysteresis
Function”)
Design guidance only
© 2007 Microchip Technology Inc.
DS21664D-page 55
MCP2502X/5X
NOTES:
DS21664D-page 56
© 2007 Microchip Technology Inc.
MCP2502X/5X
10.0
PACKAGING INFORMATION
10.1
Package Marking Information
14-Lead PDIP (300 mil)
XXXXXXXXXXXXXX
XXXXXXXXXXXXXX
YYWWNNN
14-Lead SOIC (208 mil)
Example:
MCP25050 e3
XXXXXXXXXXXXXX
0725NNN
Example:
XXXXXXXXXXX
XXXXXXXXXXX
MCP25055
XXXXXXXXXXX
YYWWNNN
0737NNN
Legend: XX...X
Y
YY
WW
NNN
e3
*
Note:
e3
Customer-specific information
Year code (last digit of calendar year)
Year code (last 2 digits of calendar year)
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code
Pb-free JEDEC designator for Matte Tin (Sn)
This package is Pb-free. The Pb-free JEDEC designator ( e3 )
can be found on the outer packaging for this package.
In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line, thus limiting the number of available
characters for customer-specific information.
© 2007 Microchip Technology Inc.
DS21664D-page 57
MCP2502X/5X
14-Lead Plastic Dual In-Line (P) – 300 mil Body [PDIP]
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
N
NOTE 1
E1
1
3
2
D
E
A2
A
L
A1
c
b1
b
e
eB
Units
Dimension Limits
Number of Pins
INCHES
MIN
N
NOM
MAX
14
Pitch
e
Top to Seating Plane
A
–
–
.210
Molded Package Thickness
A2
.115
.130
.195
Base to Seating Plane
A1
.015
–
–
Shoulder to Shoulder Width
E
.290
.310
.325
Molded Package Width
E1
.240
.250
.280
Overall Length
D
.735
.750
.775
Tip to Seating Plane
L
.115
.130
.150
Lead Thickness
c
.008
.010
.015
b1
.045
.060
.070
b
.014
.018
.022
eB
–
–
Upper Lead Width
Lower Lead Width
Overall Row Spacing §
.100 BSC
.430
Notes:
1. Pin 1 visual index feature may vary, but must be located with the hatched area.
2. § Significant Characteristic.
3. Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed .010" per side.
4. Dimensioning and tolerancing per ASME Y14.5M.
BSC: Basic Dimension. Theoretically exact value shown without tolerances.
Microchip Technology Drawing C04-005B
DS21664D-page 58
© 2007 Microchip Technology Inc.
MCP2502X/5X
14-Lead Plastic Small Outline (SL) – Narrow, 3.90 mm Body [SOIC]
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
D
N
E
E1
NOTE 1
1
2
3
e
h
b
A
A2
c
φ
L
A1
β
L1
Units
Dimension Limits
Number of Pins
α
h
MILLMETERS
MIN
N
NOM
MAX
14
Pitch
e
Overall Height
A
–
1.27 BSC
–
Molded Package Thickness
A2
1.25
–
–
Standoff §
A1
0.10
–
0.25
Overall Width
E
Molded Package Width
E1
3.90 BSC
Overall Length
D
8.65 BSC
1.75
6.00 BSC
Chamfer (optional)
h
0.25
–
0.50
Foot Length
L
0.40
–
1.27
Footprint
L1
1.04 REF
Foot Angle
φ
0°
–
8°
Lead Thickness
c
0.17
–
0.25
Lead Width
b
0.31
–
0.51
Mold Draft Angle Top
α
5°
–
15°
Mold Draft Angle Bottom
β
5°
–
15°
Notes:
1. Pin 1 visual index feature may vary, but must be located within the hatched area.
2. § Significant Characteristic.
3. Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed 0.15 mm per side.
4. Dimensioning and tolerancing per ASME Y14.5M.
BSC: Basic Dimension. Theoretically exact value shown without tolerances.
REF: Reference Dimension, usually without tolerance, for information purposes only.
Microchip Technology Drawing C04-065B
© 2007 Microchip Technology Inc.
DS21664D-page 59
MCP2502X/5X
NOTES:
DS21664D-page 60
© 2007 Microchip Technology Inc.
MCP2502X/5X
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.
PART NO.
X
/XX
Device
Temperature
Range
Package
Examples:
a)
b)
c)
Device:
MCP25020:
MCP25020T:
MCP25025:
MCP25025T:
MCP25050:
MCP25050T:
CAN I/O Expander
CAN I/O Expander (Tape and Reel)
CAN I/O Expander
CAN I/O Expander (Tape and Reel)
Mixed Signal CAN I/O Expander
Mixed Signal CAN I/O Expander
(Tape and Reel)
MCP25055: Mixed Signal CAN I/O Expander
MCP25055T: Mixed Signal CAN I/O Expander
(Tape and Reel)
Temperature Range:
I
E
=
=
-40°C to +85°C
-40°C to +125°C (not available on MCP25025
or MCP25055 devices)
Package:
P
SL
=
=
Plastic DIP (300 mil Body), 14-lead
Plastic SOIC (150 mil Body), 14-lead
© 2007 Microchip Technology Inc.
d)
MCP25020–I/P:
Industrial temperature,
PDIP package.
MCP25025–I/SL: Industrial temperature,
SOIC package.
MCP25050T-E/SL: Tape and Reel,
Extended temperature,
SOIC package.
MCP25055-I/SL:
Industrial temperature
SOIC package.
DS21664D-page 61
MCP2502X/5X
NOTES:
DS21664D-page 62
© 2007 Microchip Technology Inc.
MCP2502X/5X
APPENDIX A:
REVISION HISTORY
Revision D (January 2007)
This revision includes updates to the packaging
diagrams.
© 2007 Microchip Technology Inc.
DS21664D-page 63
NOTES:
DS21664D-page 64
© 2007 Microchip Technology Inc.
Note the following details of the code protection feature on Microchip devices:
•
Microchip products meet the specification contained in their particular Microchip Data Sheet.
•
Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.
•
There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
•
Microchip is willing to work with the customer who is concerned about the integrity of their code.
•
Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
Information contained in this publication regarding device
applications and the like is provided only for your convenience
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
MICROCHIP MAKES NO REPRESENTATIONS OR
WARRANTIES OF ANY KIND WHETHER EXPRESS OR
IMPLIED, WRITTEN OR ORAL, STATUTORY OR
OTHERWISE, RELATED TO THE INFORMATION,
INCLUDING BUT NOT LIMITED TO ITS CONDITION,
QUALITY, PERFORMANCE, MERCHANTABILITY OR
FITNESS FOR PURPOSE. Microchip disclaims all liability
arising from this information and its use. Use of Microchip
devices in life support and/or safety applications is entirely at
the buyer’s risk, and the buyer agrees to defend, indemnify and
hold harmless Microchip from any and all damages, claims,
suits, or expenses resulting from such use. No licenses are
conveyed, implicitly or otherwise, under any Microchip
intellectual property rights.
Trademarks
The Microchip name and logo, the Microchip logo, Accuron,
dsPIC, KEELOQ, microID, MPLAB, PIC, PICmicro, PICSTART,
PRO MATE, PowerSmart, rfPIC, and SmartShunt are
registered trademarks of Microchip Technology Incorporated
in the U.S.A. and other countries.
AmpLab, FilterLab, Migratable Memory, MXDEV, MXLAB,
SEEVAL, SmartSensor and The Embedded Control Solutions
Company are registered trademarks of Microchip Technology
Incorporated in the U.S.A.
Analog-for-the-Digital Age, Application Maestro, CodeGuard,
dsPICDEM, dsPICDEM.net, dsPICworks, ECAN,
ECONOMONITOR, FanSense, FlexROM, fuzzyLAB,
In-Circuit Serial Programming, ICSP, ICEPIC, Linear Active
Thermistor, Mindi, MiWi, MPASM, MPLIB, MPLINK, PICkit,
PICDEM, PICDEM.net, PICLAB, PICtail, PowerCal,
PowerInfo, PowerMate, PowerTool, REAL ICE, rfLAB,
rfPICDEM, Select Mode, Smart Serial, SmartTel, Total
Endurance, UNI/O, WiperLock and ZENA are trademarks of
Microchip Technology Incorporated in the U.S.A. and other
countries.
SQTP is a service mark of Microchip Technology Incorporated
in the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
© 2007, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
Microchip received ISO/TS-16949:2002 certification for its worldwide
headquarters, design and wafer fabrication facilities in Chandler and
Tempe, Arizona, Gresham, Oregon and Mountain View, California. The
Company’s quality system processes and procedures are for its PIC®
MCUs and dsPIC DSCs, KEELOQ® code hopping devices, Serial
EEPROMs, microperipherals, nonvolatile memory and analog
products. In addition, Microchip’s quality system for the design and
manufacture of development systems is ISO 9001:2000 certified.
© 2007 Microchip Technology Inc.
DS21664D-page 65
WORLDWIDE SALES AND SERVICE
AMERICAS
ASIA/PACIFIC
ASIA/PACIFIC
EUROPE
Corporate Office
2355 West Chandler Blvd.
Chandler, AZ 85224-6199
Tel: 480-792-7200
Fax: 480-792-7277
Technical Support:
http://support.microchip.com
Web Address:
www.microchip.com
Asia Pacific Office
Suites 3707-14, 37th Floor
Tower 6, The Gateway
Habour City, Kowloon
Hong Kong
Tel: 852-2401-1200
Fax: 852-2401-3431
India - Bangalore
Tel: 91-80-4182-8400
Fax: 91-80-4182-8422
India - New Delhi
Tel: 91-11-4160-8631
Fax: 91-11-4160-8632
Austria - Wels
Tel: 43-7242-2244-39
Fax: 43-7242-2244-393
Denmark - Copenhagen
Tel: 45-4450-2828
Fax: 45-4485-2829
India - Pune
Tel: 91-20-2566-1512
Fax: 91-20-2566-1513
France - Paris
Tel: 33-1-69-53-63-20
Fax: 33-1-69-30-90-79
Japan - Yokohama
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Fax: 774-760-0088
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Fax: 61-2-9868-6755
China - Beijing
Tel: 86-10-8528-2100
Fax: 86-10-8528-2104
China - Chengdu
Tel: 86-28-8665-5511
Fax: 86-28-8665-7889
Korea - Gumi
Tel: 82-54-473-4301
Fax: 82-54-473-4302
China - Fuzhou
Tel: 86-591-8750-3506
Fax: 86-591-8750-3521
Korea - Seoul
Tel: 82-2-554-7200
Fax: 82-2-558-5932 or
82-2-558-5934
China - Hong Kong SAR
Tel: 852-2401-1200
Fax: 852-2401-3431
Malaysia - Penang
Tel: 60-4-646-8870
Fax: 60-4-646-5086
China - Qingdao
Tel: 86-532-8502-7355
Fax: 86-532-8502-7205
Philippines - Manila
Tel: 63-2-634-9065
Fax: 63-2-634-9069
China - Shanghai
Tel: 86-21-5407-5533
Fax: 86-21-5407-5066
Singapore
Tel: 65-6334-8870
Fax: 65-6334-8850
China - Shenyang
Tel: 86-24-2334-2829
Fax: 86-24-2334-2393
Taiwan - Hsin Chu
Tel: 886-3-572-9526
Fax: 886-3-572-6459
China - Shenzhen
Tel: 86-755-8203-2660
Fax: 86-755-8203-1760
Taiwan - Kaohsiung
Tel: 886-7-536-4818
Fax: 886-7-536-4803
China - Shunde
Tel: 86-757-2839-5507
Fax: 86-757-2839-5571
Taiwan - Taipei
Tel: 886-2-2500-6610
Fax: 886-2-2508-0102
China - Wuhan
Tel: 86-27-5980-5300
Fax: 86-27-5980-5118
Thailand - Bangkok
Tel: 66-2-694-1351
Fax: 66-2-694-1350
Italy - Milan
Tel: 39-0331-742611
Fax: 39-0331-466781
Netherlands - Drunen
Tel: 31-416-690399
Fax: 31-416-690340
Spain - Madrid
Tel: 34-91-708-08-90
Fax: 34-91-708-08-91
UK - Wokingham
Tel: 44-118-921-5869
Fax: 44-118-921-5820
China - Xian
Tel: 86-29-8833-7250
Fax: 86-29-8833-7256
12/08/06
DS21664D-page 66
© 2007 Microchip Technology Inc.