MPC5634M datasheet(32/132 Pages) FREESCALE

32 / 132 page

MPC5634M Microcontroller Data Sheet, Rev. 8

Freescale Semiconductor

2.3.17

FlexCAN

The MPC5634M MCU contains two controller area network (FlexCAN) blocks. The FlexCAN module is a communication

controller implementing the CAN protocol according to Bosch Specification version 2.0B. The CAN protocol was designed to

be used primarily 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. FlexCAN module ‘A’ contains 64

message buffers (MB); FlexCAN module ‘C’ contains 32 message buffers.

The FlexCAN module provides the following features:

•

Based on and including all existing features of the Freescale TouCAN module

•

Full Implementation of the CAN protocol specification, Version 2.0B

— Standard data and remote frames

— Extended data and remote frames

— Zero to eight bytes data length

— Programmable bit rate up to 1 Mbit/s

•

Content-related addressing

•

64 / 32 message buffers of zero to eight bytes data length

•

Individual Rx Mask Register per message buffer

•

Each message buffer configurable as Rx or Tx, all supporting standard and extended messages

•

Includes 1056 / 544 bytes of embedded memory for message buffer storage

•

Includes a 256-byte and a 128-byte memories for storing individual Rx mask registers

•

Full featured Rx FIFO with storage capacity for six frames and internal pointer handling

•

Powerful Rx FIFO ID filtering, capable of matching incoming IDs against 8 extended, 16 standard or 32 partial (8 bits)

IDs, with individual masking capability

•

Selectable backwards compatibility with previous FlexCAN versions

•

Programmable clock source to the CAN Protocol Interface, either system clock or oscillator clock

•

Listen only mode capability

•

Programmable loop-back mode supporting self-test operation

•

3 programmable Mask Registers

•

Programmable transmit-first scheme: lowest ID, lowest buffer number or highest priority

•

Time Stamp based on 16-bit free-running timer

•

Global network time, synchronized by a specific message

•

Maskable interrupts

•

Warning interrupts when the Rx and Tx Error Counters reach 96

•

Independent of the transmission medium (an external transceiver is assumed)

•

Multi master concept

•

High immunity to EMI

•

Short latency time due to an arbitration scheme for high-priority messages

•

Low power mode, with programmable wake-up on bus activity

2.3.18

System timers

The system timers provide two distinct types of system timer:

•

Periodic interrupts/triggers using the Peripheral Interrupt Timer (PIT)

•

Operating system task monitors using the System Timer Module (STM)

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