SPC5644AF0MLU2 datasheet(16/138 Pages) FREESCALE

16 / 138 page

MPC5644A Microcontroller Data Sheet, Rev. 7

Freescale Semiconductor

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. Each FlexCAN module contains 64

message buffers.

The FlexCAN modules provide 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 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 1088 bytes of embedded memory for message buffer storage

•

Includes 256-byte memory 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

1.4.17

FlexRay

The MPC5644A includes one dual-channel FlexRay module that implements the FlexRay Communications System Protocol

Specification, Version 2.1 Rev A. Features include:

•

Single channel support

•

FlexRay bus data rates of 10 Mbit/s, 8 Mbit/s, 5 Mbit/s, and 2.5 Mbit/s supported

•

128 message buffers, each configurable as:

— Receive message buffer

— Single buffered transmit message buffer

— Double buffered transmit message buffer (combines two single buffered message buffer)

•

2 independent receive FIFOs

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