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S9S08DZ32F1CLH Datasheet, PDF (245/416 Pages) Freescale Semiconductor, Inc – HC08 instruction set with added BGND instruction | |||
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Chapter 12 Freescaleâs Controller Area Network (S08MSCANV1)
Table 12-25. IDR0 Register Field Descriptions â Extended
Field
7:0
ID[28:21]
Description
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.
7
R
ID20
W
6
ID19
5
ID18
4
SRR(1)
3
IDE(1)
2
ID17
1
ID16
Reset:
x
x
x
x
x
x
x
Figure 12-26. Identiï¬er Register 1 (IDR1) â Extended Identiï¬er Mapping
1 SRR and IDE are both 1s.
0
ID15
x
Table 12-26. IDR1 Register Field Descriptions â Extended
Field
7:5
ID[20:18]
4
SRR
3
IDE
2:0
ID[17:15]
Description
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.
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 12-27. Identiï¬er Register 2 (IDR2) â Extended Identiï¬er Mapping
Table 12-27. IDR2 Register Field Descriptions â Extended
Field
7:0
ID[14:7]
Description
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.
MC9S08DZ60 Series Data Sheet, Rev. 4
Freescale Semiconductor
245
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