PIC18C658 MICROCHIP [Microchip Technology], PIC18C658 Datasheet - Page 183

• Manufacturer Part Number: PIC18C658
• Description: High-Performance Microcontrollers with CAN Module
• Manufacturer: MICROCHIP [Microchip Technology]

17.0
17.1
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,
• 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
• 6 full (standard/extended identifier) acceptance fil-
• 2 full acceptance filter masks, one each associ-
• Three transmit buffers with application specified
• Programmable wake-up functionality with inte-
• Programmable Loopback mode supports self-test
• Signaling via interrupt capabilities for all CAN
• Programmable clock source
• Programmable link to timer module for
• Low power SLEEP mode
CAN2.0A and CAN2.0B
received message storage buffers
ters, 2 associated with the high priority receive
buffer, and 4 associated with the low priority
receive buffer
ated with the high and low priority receive buffers
prioritization and abort capability
grated low-pass filter
operation
receiver and transmitter error states
time-stamping and network synchronization
2000 Microchip Technology Inc.
CAN MODULE
Overview
Advanced Information
17.1.1
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
OVERVIEW OF THE MODULE
PIC18CXX8
DS30475A-page 183