MC9S12KG128_10 Datasheet, PDF (303/606 Pages) Freescale Semiconductor, Inc – HCS12 Microcontrollers

Chapter 9 Freescale’s Scalable Controller Area Network (S12MSCANV2)
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 9-26. Identifier Register 1 (IDR1) — Extended Identifier Mapping
0
ID15
x
Table 9-25. IDR1 Register Field Descriptions — Extended
Field
7:5
ID[20:18]
4
SRR
3
IDE
2:0
ID[17:15]
Description
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.
Module Base + 0x00X2
7
6
5
4
3
2
1
0
R
ID14
ID13
ID12
ID11
ID10
ID9
ID8
ID7
W
Reset:
x
x
x
x
x
x
x
x
Figure 9-27. Identifier Register 2 (IDR2) — Extended Identifier Mapping
Table 9-26. IDR2 Register Field Descriptions — Extended
Field
7:0
ID[14:7]
Description
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.
MC9S12KG128 Data Sheet, Rev. 1.16
Freescale Semiconductor
303