MPC5566 Microcontroller Reference Manual, Rev. 2
22-2 Freescale Semiconductor
22.1.1 Block Diagram
A general block diagram is shown in Figure 22-1, 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
1 KB
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