mcf51ac256a Freescale Semiconductor, Inc, mcf51ac256a Datasheet - Page 343

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

1
Freescale Semiconductor
IDE is 0.
ID[2:0]
Field
RTR
IDE
7:5
4
3
Reset:
Reset:
Reset:
W
W
W
R
R
R
Standard Format Identifier — The identifiers consist of 11 bits (ID[10:0]) for the standard format. ID10 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. See also ID bits in
Remote Transmission Request — This flag reflects the status of the Remote Transmission Request bit in the
CAN frame. In the case of a receive buffer, it indicates the status of the received frame and supports the
transmission of an answering frame in software. In the case of a transmit buffer, this flag defines the setting of
the RTR bit to be sent.
0 Data frame
1 Remote frame
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)
ID2
x
x
x
7
7
7
MCF51AC256 ColdFire Integrated Microcontroller Reference Manual, Rev. 5
Figure 15-29. Identifier Register 1 — Standard Mapping
Figure 15-30. Identifier Register 2 — Standard Mapping
Figure 15-31. Identifier Register 3 — Standard Mapping
= Unused; always read ‘x’
= Unused; always read ‘x’
= Unused; always read ‘x’
ID1
6
x
6
x
6
x
Table 15-30. IDR1 Register Field Descriptions
ID0
5
x
5
x
5
x
RTR
4
x
4
x
4
x
Description
IDE
3
x
3
x
3
x
(1)
Freescale’s Controller Area Network (MSCANV1)
2
x
2
x
2
x
Table
15-29.
1
x
1
x
1
x
0
x
0
x
0
x
15-27