PIC18C658T-ESLASHCL datasheet(183/366 Pages) MICROCHIP

183 / 366 page

 2000 Microchip Technology Inc.

Advanced Information

DS30475A-page 183

PIC18CXX8

17.0

CAN MODULE

17.1

Overview

The Controller Area Network (CAN) module is a serial

interface, useful for communicating with other peripher-

als or microcontroller devices. This interface/protocol

was designed to allow communications within noisy

environments.

The CAN module is a communication controller imple-

menting the CAN 2.0 A/B protocol as defined in the

BOSCH specification. The module will support CAN

1.2, CAN 2.0A, CAN2.0B Passive, and CAN 2.0B

Active versions of the protocol. The module implemen-

tation is a Full CAN system. The CAN specification is

not covered within this data sheet. The reader may

refer to the BOSCH CAN specification for further

details.

The module features are as follows:

• Implementation of the CAN protocol CAN1.2,

CAN2.0A and CAN2.0B

• Standard and extended data frames

• 0 - 8 bytes data length

• Programmable bit rate up to 1 Mbit/sec

• Support for remote frames

• Double buffered receiver with two prioritized

received message storage buffers

• 6 full (standard/extended identifier) acceptance fil-

ters, 2 associated with the high priority receive

buffer, and 4 associated with the low priority

receive buffer

• 2 full acceptance filter masks, one each associ-

ated with the high and low priority receive buffers

• Three transmit buffers with application specified

prioritization and abort capability

• Programmable wake-up functionality with inte-

grated low-pass filter

• Programmable Loopback mode supports self-test

operation

• Signaling via interrupt capabilities for all CAN

receiver and transmitter error states

• Programmable clock source

• Programmable link to timer module for

time-stamping and network synchronization

• Low power SLEEP mode

17.1.1

OVERVIEW OF THE MODULE

The CAN bus module consists of a Protocol Engine

and message buffering and control. The CAN protocol

engine handles all functions for receiving and transmit-

ting messages on the CAN bus. Messages are trans-

mitted by first loading the appropriate data registers.

Status and errors can be checked by reading the

appropriate registers. Any message detected on the

CAN bus is checked for errors and then matched

against filters to see if it should be received and stored

in one of the 2 receive registers.

The CAN Module supports the following Frame types:

• Standard Data Frame

• Extended Data Frame

• Remote Frame

• Error Frame

• Overload Frame Reception

• Interframe Space

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