Freescale’s Scalable Controller Area Network (S12MSCANV3)
Module Base + 0x00X2
7
6
5
4
3
2
1
0
R
W
ID14
ID13
ID12
ID11
ID10
ID9
ID8
ID7
Reset:
x
x
x
x
x
x
x
x
Figure 8-28. Identifier Register 2 (IDR2) — Extended Identifier Mapping
Table 8-29. IDR2 Register Field Descriptions — Extended
Description
Field
7-0
ID[14:7]
Extended Format Identifier — The identifiers consist of 29 bits (ID[28:0]) for the extended format. ID28 is the
most significant bit and is transmitted first on the CAN bus during the arbitration procedure. The priority of an
identifier is defined to be highest for the smallest binary number.
Module Base + 0x00X3
7
6
5
4
3
2
1
0
R
ID6
W
ID5
ID4
ID3
ID2
ID1
ID0
RTR
Reset:
x
x
x
x
x
x
x
x
Figure 8-29. Identifier Register 3 (IDR3) — Extended Identifier Mapping
Table 8-30. IDR3 Register Field Descriptions — Extended
Description
Field
7-1
ID[6:0]
Extended Format Identifier — The identifiers consist of 29 bits (ID[28:0]) for the extended format. ID28 is the
most significant bit and is transmitted first on the CAN bus during the arbitration procedure. The priority of an
identifier is defined to be highest for the smallest binary number.
0
Remote Transmission Request — This flag reflects the status of the remote transmission request bit in the
RTR
CAN frame. In the case of a receive buffer, it indicates the status of the received frame and supports the
transmission of an answering frame in software. In the case of a transmit buffer, this flag defines the setting of
the RTR bit to be sent.
0 Data frame
1 Remote frame
S12P-Family Reference Manual, Rev. 1.13
280
Freescale Semiconductor
FREESCALE [ Freescale ]
