mcf51ac256a Freescale Semiconductor, Inc, mcf51ac256a Datasheet - Page 317

• Manufacturer Part Number: mcf51ac256a
• Description: Mcf51ac Flexis
• Manufacturer: Freescale Semiconductor, Inc

Chapter 15
Freescale’s Controller Area Network (MSCANV1)
15.1
Freescale’s controller area network (MSCAN) definition is based on the MSCAN12 definition, which is
the specific implementation of the MSCAN concept targeted for the M68HC12 microcontroller Family.
The module is a communication controller implementing the CAN 2.0A/B protocol as defined in the
Bosch specification dated September 1991. For users to fully understand the MSCAN specification, it is
recommended that the Bosch specification be read first to familiarize the reader with the terms and
concepts contained within this document.
Though not exclusively intended for automotive applications, CAN protocol is designed to meet the
specific requirements of a vehicle serial data bus: real-time processing, reliable operation in the EMI
environment of a vehicle, cost-effectiveness, and required bandwidth.
MSCAN uses an advanced buffer arrangement resulting in predictable real-time behavior and simplified
application software.
15.1.1
The basic features of the MSCAN are as follows:
1. Depending on the actual bit timing and the clock jitter of the PLL.
Freescale Semiconductor
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Implementation of the CAN protocol — Version 2.0 A/B
— Standard and extended data frames
— Zero to eight bytes data length
— Programmable bit rate up to 1 Mbps
— Support for remote frames
Five receive buffers with FIFO storage scheme
Three transmit buffers with internal prioritization using a “local priority” concept
Flexible maskable identifier filter supports two full-size (32-bit) extended identifier filters, or four
16-bit filters, or eight 8-bit filters
Programmable wakeup functionality with integrated low-pass filter
Programmable loopback mode supports self-test operation
Programmable listen-only mode for monitoring of CAN bus
Programmable bus-off recovery functionality
Separate signalling and interrupt capabilities for all CAN receiver and transmitter error states
(warning, error passive, bus-off)
Introduction
Features
MCF51AC256 ColdFire Integrated Microcontroller Reference Manual, Rev. 5
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