mcf51ac256a Freescale Semiconductor, Inc, mcf51ac256a Datasheet - Page 341

• Manufacturer Part Number: mcf51ac256a
• Description: Mcf51ac Flexis
• Manufacturer: Freescale Semiconductor, Inc

1
Freescale Semiconductor
ID[28:21]
SRR and IDE are both 1s.
ID[20:18]
ID[17:15]
Field
Field
SRR
IDE
7:0
7:5
2:0
4
3
Reset:
Reset:
W
W
R
R
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.
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.
ID20
ID14
x
x
7
7
Figure 15-25. Identifier Register 1 (IDR1) — Extended Identifier Mapping
Figure 15-26. Identifier Register 2 (IDR2) — Extended Identifier Mapping
MCF51AC256 ColdFire Integrated Microcontroller Reference Manual, Rev. 5
Table 15-25. IDR0 Register Field Descriptions — Extended
Table 15-26. IDR1 Register Field Descriptions — Extended
ID19
ID13
6
x
6
x
ID18
ID12
5
x
5
x
SRR
ID11
4
x
4
x
Description
(1)
Description
IDE
ID10
3
x
3
x
(1)
Freescale’s Controller Area Network (MSCANV1)
ID17
ID9
2
x
2
x
ID16
ID8
1
x
1
x
ID15
ID7
0
x
0
x
15-25