
Chapter 10 Freescale’s Scalable Controller Area Network (S12MSCANV2)
320
MC9S12C-Family / MC9S12GC-Family
Freescale Semiconductor
Rev 01.20
10.3.3.1.2
IDR0–IDR3 for Standard Identier Mapping
Module Base + 0x00X3
76543210
R
ID6
ID5
ID4
ID3
ID2
ID1
ID0
RTR
W
Reset:
xxxxxxxx
Figure 10-28. Identier Register 3 (IDR3) — Extended Identier Mapping
Table 10-27. IDR3 Register Field Descriptions — Extended
Field
Description
7:1
ID[6:0]
Extended Format Identier — The identiers consist of 29 bits (ID[28:0]) for the extended format. ID28 is the
most signicant bit and is transmitted rst on the CAN bus during the arbitration procedure. The priority of an
identier is dened to be highest for the smallest binary number.
0
RTR
Remote Transmission Request — This ag reects the status of the remote transmission request bit in the
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 ag denes the setting of
the RTR bit to be sent.
0 Data frame
1 Remote frame
Module Base + 0x00X0
76543210
R
ID10
ID9
ID8
ID7
ID6
ID5
ID4
ID3
W
Reset:
xxxxxxxx
Figure 10-29. Identier Register 0 — Standard Mapping
Table 10-28. IDR0 Register Field Descriptions — Standard
Field
Description
7:0
ID[10:3]
Standard Format Identier — The identiers consist of 11 bits (ID[10:0]) for the standard format. ID10 is the
most signicant bit and is transmitted rst on the CAN bus during the arbitration procedure. The priority of an
identier is dened to be highest for the smallest binary number. See also ID bits in
Table 10-29.