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S9S12XS256J0CAL Datasheet, PDF (324/738 Pages) Freescale Semiconductor, Inc – Microcontrollers | |||
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Freescaleâs Scalable Controller Area Network (S12MSCANV3)
11.3.3.1.1 IDR0âIDR3 for Extended Identiï¬er 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 11-26. Identiï¬er Register 0 (IDR0) â Extended Identiï¬er Mapping
Table 11-27. IDR0 Register Field Descriptions â Extended
0
ID21
x
Field
Description
7-0
ID[28:21]
Extended Format Identiï¬er â The identiï¬ers consist of 29 bits (ID[28:0]) for the extended format. ID28 is the
most signiï¬cant bit and is transmitted ï¬rst on the CAN bus during the arbitration procedure. The priority of an
identiï¬er is deï¬ned 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 11-27. Identiï¬er Register 1 (IDR1) â Extended Identiï¬er Mapping
0
ID15
x
Table 11-28. IDR1 Register Field Descriptions â Extended
Field
Description
7-5
ID[20:18]
4
SRR
3
IDE
2-0
ID[17:15]
Extended Format Identiï¬er â The identiï¬ers consist of 29 bits (ID[28:0]) for the extended format. ID28 is the
most signiï¬cant bit and is transmitted ï¬rst on the CAN bus during the arbitration procedure. The priority of an
identiï¬er is deï¬ned to be highest for the smallest binary number.
Substitute Remote Request â This ï¬xed 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 â This ï¬ag indicates whether the extended or standard identiï¬er format is applied in this buffer. In
the case of a receive buffer, the ï¬ag is set as received and indicates to the CPU how to process the buffer
identiï¬er registers. In the case of a transmit buffer, the ï¬ag indicates to the MSCAN what type of identiï¬er to send.
0 Standard format (11 bit)
1 Extended format (29 bit)
Extended Format Identiï¬er â The identiï¬ers consist of 29 bits (ID[28:0]) for the extended format. ID28 is the
most signiï¬cant bit and is transmitted ï¬rst on the CAN bus during the arbitration procedure. The priority of an
identiï¬er is deï¬ned to be highest for the smallest binary number.
S12XS Family Reference Manual, Rev. 1.13
324
Freescale Semiconductor
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