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MCP2515

Stand-Alone CAN Controller with SPI Interface

Microchip Technology 

MCP2515

1.4 Transmit/Receive Buffers/Masks/

Filters

The MCP2515 has three transmit and two receive

buffers, two acceptance masks (one for each receive

buffer) and a total of six acceptance filters. Figure 1-3

shows a block diagram of these buffers and their

connection to the protocol engine.

FIGURE 1-3:

CAN BUFFERS AND PROTOCOL ENGINE BLOCK DIAGRAM

BUFFERS

TXB0

TXB1

TXB2

Message

Queue

Control

Transmit Byte Sequencer

A

c

Acceptance Mask

RXM0

c

Acceptance Filter

e

RXF0

p

t

Acceptance Filter

RXF1

Acceptance Mask

RXM1

Acceptance Filter

RXF2

A

Acceptance Filter

RXF3

c

c

Acceptance Filter

e

RXF4

p

Acceptance Filter

t

RXF5

R

X

B

0

Identifier

M

A

Identifier

B

R

X

B

1

Data Field

Data Field

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

SOF

Transmit

Logic

TX

Bit

Timing

Logic

RX

Clock

Generator

Configuration

Registers

 2003-2012 Microchip Technology Inc.

DS21801G-page 5

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