NXP Semiconductors MC9S12G - Page 596

Scalable Controller Area Network (S12MSCANV3)
MC9S12G Family Reference Manual Rev.1.27
598 NXP Semiconductors
Module Base + 0x00X2
76543210
R
ID14 ID13 ID12 ID11 ID10 ID9 ID8 ID7
W
Reset:xxxxxxxx
Figure 18-28. Identifier Register 2 (IDR2) — Extended Identifier Mapping
Table 18-29. IDR2 Register Field Descriptions — Extended
Field Description
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
76543210
R
ID6 ID5 ID4 ID3 ID2 ID1 ID0 RTR
W
Reset:xxxxxxxx
Figure 18-29. Identifier Register 3 (IDR3) — Extended Identifier Mapping
Table 18-30. 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