MCP25020ISLASHP datasheet(5/66 Pages) MICROCHIP

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DS21664D-page 5

MCP2502X/5X

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

• 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

FIGURE 2-1:

CAN MODULE

Acceptance Filter

RXF1

Identifier

Data Field

Identifier

Acceptance Mask

RXM

Acceptance Filter

RXF0

TXB2

Message

Queue

Control

Transmit Byte Sequencer

TXB0

CRC<14:0>

Comparator

Receive<7:0>

Transmit<7:0>

Receive

Error

Transmit

Error

Protocol

REC

TEC

ErrPas

BusOff

Finite

State

Machine

Counter

Shift<14:0>

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

Transmit

Logic

Bit

Timing

Logic

TXCAN/TXRXCAN

RXCAN

Configuration

Registers

Clock

Generator

PROTOCOL

ENGINE

BUFFERS

TXB1

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