Motorola MPC533 Reference Manual page 690

TouCAN Architecture
MSB
0x0
0x2
0x4
0x6
0x8
0xA
0xC
0xE
Figure 16-3. Extended ID Message Buffer Structure
Figure 16-4 displays the standard (11-bit) ID message buffer structure.
MSB
0
0x0
0x2
0x4
0x6
0x8
0xA
0xC
0xE
Figure 16-4. Standard ID Message Buffer Structure
16.3.1.1 Common Fields for Extended and Standard Format Frames
Table 16-1 describes the message buffer fields that are common to both extended and
standard identifier format frames.
Table 16-1. Common Extended/Standard Format Frames
Field
Time Stamp Contains a copy of the high byte of the free running timer, which is captured at the beginning of the
identifier field of the frame on the CAN bus.
Code Refer to Table 16-2 and Table 16-3.
Length (Rx) Length (in bytes) of the Rx data stored in offset 0x6 through 0xD of the buffer.This field is written by
the TouCAN module, copied from the DLC (data length code) field of the received frame.
16-4
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
0 7 8
Time Stamp Code
ID[28-18]
ID[14-0]
Data Byte 0
Data Byte 2
Data Byte 4
Data Byte 6
Reserved
7 8
Time Stamp Code
ID[28:18]
16-bit Time Stamp
Data Byte 0
Data Byte 2
Data Byte 4
Data Byte 6
Reserved
MPC533 Reference Manual
LSB L
11 12 15
Length
SRR IDE ID[17-15]
RTR ID_LOW
Data Byte 1
Data Byte 3
Data Byte 5
Data Byte 7
LSB
11 12
Length
RTR 0 0 0
Data Byte 1
Data Byte 3
Data Byte 5
Data Byte 7
Description
CONTROL/STATUS
ID_HIGH
L
15
CONTROL/STATUS
0 ID_HIGH
ID_LOW
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