Freescale Semiconductor MCF5329 Reference Manual page 581

The message buffer structure used by the FlexCAN module is shown in
extended frames used in the CAN Specification Version 2.0, Part B are represented. A standard frame is
represented by the 11-bit standard identifier, and an extended frame is represented by the combined 29-bits
of the standard identifier (11 bits) and the extended identifier (18 bits).
31 30 29 28 27 26 25 24
0x0 CODE
0x4
0x8 Data Byte 0
0xC Data Byte 4
Figure 23-13. Message Buffer Structure for Extended and Standard Frames
Freescale Semiconductor
FlexCAN Base
Address Offset
0x80
0x84
0x88
8 byte Data fields
0x8F
0x90
Message Buffer 1
0x9F
0xA0
Message Buffer 2
0xAF
0xB0
Message Buffer 3
Message Buffer 14
0x16F
0x170
Message Buffer 15
0x17F
Figure 23-12. FlexCAN Message Buffer Memory Map
23 22 21 20 19 18 17 16 15 14 13 12 11 10
SRR IDE RTR LENGTH
Standard ID[28:18]
Data Byte 1
Data Byte 5
MCF5329 Reference Manual, Rev 3
Control/Status
Identifier
Figure
Extended ID[17:0]
Data Byte 2
Data Byte 6
FlexCAN
Message Buffer 0
23-13. Standard and
9 8 7 6 5 4 3 2
TIME STAMP
Data Byte 3
Data Byte 7
1 0
23-17