mcf5282 Freescale Semiconductor, Inc, mcf5282 Datasheet - Page 478

• Manufacturer Part Number: mcf5282
• Manufacturer: Freescale Semiconductor, Inc

FlexCAN
25.4
The FlexCAN module is flexible in that each one of its 16 message buffers (MBs) can be assigned either
as a transmit buffer or a receive buffer. Each MB, which is up to 8 bytes long, is also assigned an interrupt
flag bit that indicates successful completion of either transmission or reception.
25.4.1
The CPU prepares or changes an MB for transmission by executing the following steps:
25-8
•
•
Writing the Control/Status word to hold Tx MB inactive (code = 1000).
Writing the ID_HIGH and ID_LOW words.
Functional Overview
Transmit Process
Note that for both processes, the first CPU action in preparing a MB should
be to deactivate it by setting its code field to the proper value. This
requirement is mandatory to assure proper operation.
FlexCAN Base
Address Offset
Message Buffers
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3
0x80-0x8F
0x16E
0x17E
0x170
0xAE
0x8C
0x8E
0x9E
0xA0
0xB0
0x82
0x84
0x86
0x90
Figure 25-5. FlexCAN Memory Map
8 bytes Data field
Control/Status
Reserved
ID_HIGH
ID_LOW
NOTE
Message Buffer 0
Message Buffer 15
Message Buffer 1
Message Buffer 2
Message Buffer 3
through
Message Buffer 14
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