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MCP25020

Stand-Alone CAN Controller

Microchip Technology 

2.0 CAN MODULE

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:

BUFFERS

CAN MODULE

MCP2502X/5X

• 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

TXB0

Message

Queue

Control

TXB1

TXB2

Transmit Byte Sequencer

A

Acceptance Mask

A

c

c

RXM

c

c

e

e

p Acceptance Filter Acceptance Filter

p

t

RXF0

RXF1

t

R

X

B

Identifier

M

A

Identifier

0

B

Data Field

Data Field

R

X

B

1

PROTOCOL

ENGINE

Transmit<7:0>

Receive<7:0>

Shift<14:0>

{Transmit<5:0>, Receive<8:0>}

Comparator

CRC<14:0>

Receive

Error

Counter

Transmit

Error

Counter

REC

TEC

ErrPas

BusOff

Protocol

Finite

State

Machine

Transmit

Logic

TXCAN/TXRXCAN

Bit

Timing

Logic

RXCAN

Clock

Generator

Configuration

Registers

© 2007 Microchip Technology Inc.

DS21664D-page 5

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