mcf5282 Freescale Semiconductor, Inc, mcf5282 Datasheet - Page 471

• Manufacturer Part Number: mcf5282
• Manufacturer: Freescale Semiconductor, Inc

Chapter 25
FlexCAN
The FlexCAN module is a communication controller implementing the controller area network (CAN)
protocol, an asynchronous communications protocol used in automotive and industrial control systems. It
is a high speed (1 Mbit/sec), short distance, priority based protocol which can communicate using a variety
of mediums (for example, fiber optic cable or an unshielded twisted pair of wires). The FlexCAN supports
both the standard and extended identifier (ID) message formats specified in the CAN protocol
specification, revision 2.0, part B.
The CAN protocol was primarily, but not only, designed to be used as a vehicle serial data bus, meeting
the specific requirements of this field: real-time processing, reliable operation in the EMI environment of
a vehicle, cost-effectiveness and required bandwidth. A general working knowledge of the CAN protocol
revision 2.0 is assumed in this document. For details, refer to the CAN protocol revision 2.0 specification.
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Based on and includes all existing Freescale TouCAN module features
Freescale IP interface architecture
Full implementation of the CAN protocol specification version 2.0
— Standard data and remote frames (up to 109 bits long)
— Extended data and remote frames (up to 127 bits long)
— 0–8 bytes data length
— Programmable bit rate up to 1Mbit/sec
Up to 16 flexible message buffers of 0–8 bytes data length, each configurable as Rx or Tx, all
supporting standard and extended messages
Listen-only mode capability
Content-related addressing
No read/write semaphores
Three programmable mask registers: global (for MBs 0-13), special for MB14, and special for
MB15
Programmable transmit-first scheme: lowest ID or lowest buffer number
“Time Stamp”, based on 16-bit free-running timer
Global network time, synchronized by a specific message
Programmable I/O modes
Maskable interrupts
Independent of the transmission medium (external transceiver is assumed)
Open network architecture
Multimaster bus
High immunity to EMI
Short latency time for high-priority messages
Low-power “sleep” mode, with programmable “wake up” on bus activity
Features
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3
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