The Can System - Freescale Semiconductor MCF5480 Reference Manual

Serial Buffers
Tx Tx Shifter
Rx Rx Shifter
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21.1.2

The CAN System

A typical CAN system is shown below in
Each CAN station is connected physically to the CAN bus through a transceiver. The transceiver provides
the transmit drive, waveshaping, and receive/compare functions required for communicating on the CAN
21-2
Control
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16 Transmit/Receive
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•
Mask 14
Mask 15
Global Mask
Figure 21-2. FlexCAN Message Buffer Architecture
Figure 21-3.
CAN Station 1
MCF548x
FlexCAN
CANTXn
CANRXn
Transceiver
CAN Bus
Figure 21-3. Typical CAN System
MCF548x Reference Manual, Rev. 3
IRQ or DMA Request
Data
•
•
Message Buffers
•
Buffer 14
Data
Buffer 15
Data Length
Data
Time Stamp
Data Length
Time Stamp
ID
CAN Station n
CAN Station 2
Buffer 0
•
Data
Buffer 13
Data
ID
Data Length
•
Time Stamp •
• •
ID
ID
Freescale Semiconductor
•
•
•