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MC3S12RG128 Datasheet, PDF (343/546 Pages) Freescale Semiconductor, Inc – Microcontrollers | |||
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Chapter 12
Freescaleâs Scalable Controller Area Network (MSCANV2)
12.1 Introduction
Freescaleâs scalable controller area network (MSCANV2) deï¬nition is based on the MSCAN12 deï¬nition,
which is the speciï¬c 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 deï¬ned in the
Bosch speciï¬cation dated September 1991. For users to fully understand the MSCAN speciï¬cation, it is
recommended that the Bosch speciï¬cation be read ï¬rst 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
speciï¬c 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 simpliï¬ed
application software.
12.1.1 Glossary
ACK: Acknowledge of CAN message
CAN: Controller Area Network
CRC: Cyclic Redundancy Code
EOF: End of Frame
FIFO: First-In-First-Out Memory
IFS: Inter-Frame Sequence
SOF: Start of Frame
CPU bus: CPU related read/write data bus
CAN bus: CAN protocol related serial bus
oscillator clock: Direct clock from external oscillator
bus clock: CPU bus realated clock
CAN clock: CAN protocol related clock
MC3S12RG128 Data Sheet, Rev. 1.05
Freescale Semiconductor
343
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