MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
22-2
Freescale Semiconductor
22.1.1
Block Diagram
A general block diagram is shown in
, which describes the main submodules implemented in
the FlexCAN2 module, including an embedded RAM for up to 64 message buffers.
Figure 22-1. FlexCAN2 Block Diagram
22.1.2
Overview
The CAN protocol was designed primarily, but not exclusively, 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. The FlexCAN2 module is a full
implementation of the CAN protocol specification, Version 2.0 B, which supports both standard and
extended message frames. Sixty-four message buffers (MBs) are stored in an embedded 1024-byte RAM
dedicated to the FlexCAN2 module.
MB60
RAM
Bus Interface Unit
max MB #
(0–63)
Slave Interface
CAN
Message
CNTXx
CNRXx
FlexCAN2
MB61
MB62
MB63
MB3
MB2
MB1
MB0
Clocks, Address and Data Buses,
Interrupt and Test Signals
Buffer
Management
Protocol
Interface
1Kbyte
Summary of Contents for MPC5553
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