MCP2510-SLASHST datasheet(3/80 Pages) MICROCHIP

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DS21291F-page 3

MCP2510

1.0

DEVICE FUNCTIONALITY

1.1

Overview

The MCP2510 is a stand-alone CAN controller devel-

oped to simplify applications that require interfacing

with a CAN bus. A simple block diagram of the

MCP2510 is shown in Figure 1-1. The device consists

of three main blocks:

The CAN protocol engine.

The control logic and SRAM registers that are

used to configure the device and its operation.

The SPI protocol block.

A typical system implementation using the device is

shown in Figure 1-2.

The CAN protocol engine handles all functions for

receiving and transmitting messages on the bus. Mes-

sages are transmitted by first loading the appropriate

message buffer and control registers. Transmission is

initiated by using control register bits, via the SPI inter-

face, or by using the transmit enable pins. Status and

errors can be checked by reading the appropriate reg-

isters. Any message detected on the CAN bus is

checked for errors and then matched against the user

defined filters to see if it should be moved into one of

the two receive buffers.

The MCU interfaces to the device via the SPI interface.

Writing to and reading from all registers is done using

standard SPI read and write commands.

Interrupt pins are provided to allow greater system flex-

ibility. There is one multi-purpose interrupt pin as well

as specific interrupt pins for each of the receive regis-

ters that can be used to indicate when a valid message

has been received and loaded into one of the receive

buffers. Use of the specific interrupt pins is optional,

and the general purpose interrupt pin as well as status

registers (accessed via the SPI interface) can also be

used to determine when a valid message has been

received.

There are also three pins available to initiate immediate

transmission of a message that has been loaded into

one of the three transmit registers. Use of these pins is

optional and initiating message transmission can also

be done by utilizing control registers accessed via the

SPI interface.

Table 1-1 gives a complete list of all of the pins on the

MCP2510.

FIGURE 1-1:

BLOCK DIAGRAM

3 TX

Buffers

2 RX Buffers

Message Assembly

6 Acceptance

Filters

SPI

Interface

Logic

SPI

Bus

INT

Buffer

SCK

CAN

Protocol

Engine

RXCAN

TXCAN

Control Logic

RX0BF

RX1BF

TX0RTS

TX1RTS

TX2RTS

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