P8XC591 Datasheet, PDF (56/160 Pages) NXP Semiconductors – Single-chip 8-bit microcontroller with CAN controller

Philips Semiconductors
Single-chip 8-bit microcontroller with CAN controller
12.5.18.2 Descriptor Field of the Transmit Buffer
Preliminary Specification
P8xC591
Standard Frame Format (SFF)
Extended Frame Format (EFF)
Addr. 112 TX Frame Information
7
6
5
4
3
2
1
0
FF RTR (0) (0) DLC.3 DLC.2 DLC.1 DLC.0
Addr. 112 TX Frame Information
7
6
5
4
3
2
1
0
FF RTR (0) (0) DLC.3 DLC.2 DLC.1 DLC.0
Addr 113 TX Identifier 1
7
6
5
4
3
2
1
0
ID.28 ID.27 ID.26 ID.25 ID.24 ID.23 ID.22 ID.21
Addr. 113 TX Identifier 1
7
6
5
4
3
2
1
0
ID.28 ID.27 ID.26 ID.25 ID.24 ID.23 ID.22 ID.21
Addr. 114 TX Identifier 2
7
6
5
4
3
2
1
0
ID.20 ID.19 ID.18 (RTR) (0) (0) (0) (0)
Meaning of the Transmit Buffer Bits:
ID.x
FF
RTR
DLC.x
X
(0)
Identifier bit x
Frame Format
Remote Transmission Request
Data Length Code bit x
don’t care
don’t care, but recommended to be
compatible to Receive Buffer
Addr. 114 TX Identifier 2
7
6
5
4
3
2
1
0
ID.20 ID.19 ID.18 ID.17 ID.16 ID.15 ID.14 ID.13
Addr. 115 TX Identifier 3
7
6
5
4
3
2
1
0
ID.12 ID.11 ID.10 ID.9 ID.8 ID.7 ID.6 ID.5
Addr. 116 TX Identifier 4
7
6
5
4
3
2
1
0
ID.4 ID.3 ID.2 ID.1 ID.0 (RTR) (0) (0)
Fig.20 Bit Layout Transmit Buffer.
This configuration is chosen to be compatible with the Receive Buffer Layout (see Section 12.5.19.1).
The values marked with “( )” in the Transmit Buffer should be set to the values expected in the Receive Buffer for an easy
comparison, only when using the Self Reception facility, otherwise they are don’t care.
Table 37 Frame Format (FF) and Remote Transmission Request (RTR) bits
BIT
FF
RTR
VALUE
1 (EFF)
0 (SFF)
1 (remote)
0 (data)
FUNCTION
Extended Frame Format will be transmitted by the CAN controller
Standard Frame Format will be transmitted by the CAN controller
Remote Frame will be transmitted by the CAN controller
Data Frame will be transmitted by the CAN controller
2000 Jul 26
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