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Chapter 14 Freescale’s Scalable Controller Area Network (S12MSCANV3)
MC9S12XDP512 Data Sheet, Rev. 2.11
648 Freescale Semiconductor
14.3.3.1.2 IDR0–IDR3 for Standard Identifier Mapping
Module Base + 0x00X3
76543210
R
ID6 ID5 ID4 ID3 ID2 ID1 ID0 RTR
W
Reset: xxxxxxxx
Figure 14-28. Identifier Register 3 (IDR3) — Extended Identifier Mapping
Table 14-29. IDR3 Register Field Descriptions — Extended
Field Description
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
RTR
Remote Transmission Request — This flag reflects 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 flag defines 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 14-29. Identifier Register 0 — Standard Mapping
Table 14-30. IDR0 Register Field Descriptions — Standard
Field Description
7:0
ID[10:3]
Standard Format Identifier — The identifiers consist of 11 bits (ID[10:0]) for the standard format. ID10 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. See also ID bits in Table 14-31.