PIC18F24 MICROCHIP [Microchip Technology], PIC18F24 Datasheet - Page 201
PIC18F24
Manufacturer Part Number
PIC18F24
Description
28/40-Pin High-Performance, Enhanced Flash Microcontrollers with CAN Module
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18F24.pdf
(402 pages)
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19.0
19.1
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,
implementing the CAN 2.0 A/B protocol as defined in
the BOSCH specification. The module will support
CAN 1.2, CAN 2.0A, CAN 2.0B 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:
• Complies with ISO CAN Conformance Test
• Implementation of the CAN protocol CAN 1.2,
• 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
• 2 full acceptance filter masks, one each
• Three transmit buffers with application specified
• Programmable wake-up functionality with
• 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
2004 Microchip Technology Inc.
CAN 2.0A and CAN 2.0B
received message storage buffers
filters, 2 associated with the high priority receive
buffer and 4 associated with the low priority
receive buffer
associated with the high and low priority receive
buffers
prioritization and abort capability
integrated low-pass filter
operation
receiver and transmitter error states
time-stamping and network synchronization
CAN MODULE
Overview
19.1.1
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
transmitted 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
CAN module uses RB3/CANRX and RB2/CANTX/INT2
pins to interface with CAN bus. In order to configure
CANRX and CANTX as CAN interface:
• bit TRISB<3> must be set;
• bit TRISB<2> must be cleared.
19.1.2
The PIC18FXX8 has three transmit and two receive
buffers, two acceptance masks (one for each receive
buffer) and a total of six acceptance filters. Figure 19-1
is a block diagram of these buffers and their connection
to the protocol engine.
OVERVIEW OF THE MODULE
TRANSMIT/RECEIVE BUFFERS
PIC18FXX8
DS41159D-page 199
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