S9S12GN32F0MLC Datasheet, PDF (610/1292 Pages) Freescale Semiconductor, Inc – MC9S12G Family Reference Manual and Data Sheet

Freescale’s Scalable Controller Area Network (S12MSCANV3)
18.3.3.1.1 IDR0–IDR3 for Extended Identifier Mapping
Module Base + 0x00X0
R
W
Reset:
7
ID28
6
ID27
5
ID26
4
ID25
3
ID24
2
ID23
1
ID22
x
x
x
x
x
x
x
Figure 18-26. Identifier Register 0 (IDR0) — Extended Identifier Mapping
Table 18-27. IDR0 Register Field Descriptions — Extended
0
ID21
x
Field
Description
7-0
ID[28:21]
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 + 0x00X1
R
W
Reset:
7
ID20
6
ID19
5
ID18
4
SRR (=1)
3
IDE (=1)
2
ID17
1
ID16
x
x
x
x
x
x
x
Figure 18-27. Identifier Register 1 (IDR1) — Extended Identifier Mapping
0
ID15
x
Table 18-28. IDR1 Register Field Descriptions — Extended
Field
Description
7-5
ID[20:18]
4
SRR
3
IDE
2-0
ID[17:15]
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.
Substitute Remote Request — This fixed recessive bit is used only in extended format. It must be set to 1 by
the user for transmission buffers and is stored as received on the CAN bus for receive buffers.
ID Extended — This flag indicates whether the extended or standard identifier format is applied in this buffer. In
the case of a receive buffer, the flag is set as received and indicates to the CPU how to process the buffer
identifier registers. In the case of a transmit buffer, the flag indicates to the MSCAN what type of identifier to send.
0 Standard format (11 bit)
1 Extended format (29 bit)
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.
MC9S12G Family Reference Manual, Rev.1.23
612
Freescale Semiconductor