Intel 8XC196K Series User Manual page 287

8XC196K x , J x , CA USER'S MANUAL
Field
SOF Start-of-frame. A dominant (0) bit marks the beginning of a message frame.
11-bit message identifier.
Arbitration
RTR. Remote transmission request. Dominant (0) for data frames; recessive (1)
for remote frames.
IDE. Identifier extension bit; always dominant (0).
r0. Reserved bit; always dominant (0).
Control
DLC. Data length code. A 4-bit code that indicates the number of data bytes
(0–8).
Data Data. 1 to 8 bytes for data frames; 0 bytes for remote frames.
CRC CRC code. A 15-bit CRC code plus a recessive (1) delimiter bit.
Ack Acknowledgment. A dominant (0) bit sent by nodes receiving the frame plus a
recessive (1) delimiter bit.
End of frame 7 recessive (1) bits mark the end of a frame.
Minimum standard message frame length (bits)
Field
SOF Start-of-frame. A dominant (0) bit marks the beginning of a message frame.
11 bits of the 29-bit message identifier
SRR. Substitute remote transmission request; always recessive (1)
Arbitration IDE. Identifier extension bit; always recessive (1)
18 bits of the 29-bit message identifier
RTR. Remote transmission request; always recessive (1)
r0. Reserved bit; always dominant (0)
r1. Reserved bit; always dominant (0)
Control
DLC. Data length code. A 4-bit code that indicates the number of data bytes (0–
8)
Data Data. 1 to 8 bytes for data frames; 0 bytes for remote frames
CRC CRC code. A 15-bit CRC code plus a recessive (1) delimiter bit
Ack Acknowledgment. A dominant (0) bit sent by nodes receiving the frame plus a
recessive (1) delimiter bit.
End of frame 7 recessive (1) bits mark the end of a frame.
Minimum extended message frame length (bits)
12-8
Table 12-6. Standard Message Frame
Description
Table 12-7. Extended Message Frame
Description
Bit Count
1
12
6
0–64
16
2
7
44–108
Bit Count
1
32
6
0–64
16
2
7
64–128