S912XEG128J2VAL
| Model | S912XEG128J2VAL |
| Description | IC,MICROCONTROLLER,16-BIT,CPU12 CPU,CMOS,QFP,112PIN,PLASTIC |
| PDF file | Total 1327 pages (File size: 7M) |
| Chip Manufacturer | ROCHESTER |
Chapter 16 Freescale’s Scalable Controller Area Network (S12MSCANV3)
16.3.3.1.2
IDR0–IDR3 for Standard Identifier Mapping
Because of an order from the United States International Trade Commission, BGA-packaged product lines and part numbers indicated here currently are not
available from Freescale for import or sale in the United States prior to September 2010: S12XE products in 208 MAPBGA packages
Module Base + 0x00X0
7
6
5
4
3
2
1
0
R
ID10
W
Reset:
x
x
x
x
x
x
x
x
ID9
ID8
ID7
ID6
ID5
ID4
ID3
Figure 16-30. Identifier Register 0 — Standard Mapping
Table 16-30. IDR0 Register Field Descriptions — Standard
Field
7:0
ID[10:3]
Description
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
Table 16-31.
Module Base + 0x00X1
7
6
5
4
3
2
1
0
R
ID2
W
Reset:
x
x
x
x
x
x
x
x
ID1
ID0
RTR
IDE (=0)
= Unused; always read ‘x’
Figure 16-31. Identifier Register 1 — Standard Mapping
Table 16-31. IDR1 Register Field Descriptions
Field
7:5
ID[2:0]
4
RTR
Description
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
Table 16-30.
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)
3
IDE
MC9S12XE-Family Reference Manual Rev. 1.19
Freescale Semiconductor
635
