CP3BT23_14 Datasheet, PDF (127/324 Pages) Texas Instruments – CP3BT23 Reprogrammable Connectivity Processor with Bluetooth and Dual CAN Interfaces

CP3BT23
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SNOSCX3A – JULY 2013 – REVISED JANUARY 2014
18.2.3 CAN Frame Formats
Data Frame
The structure of a standard data frame is shown in Figure 18-3. The structure of an extended data frame
is shown in Figure 18-4.
Arbitration Field
11
Control Field
4
STANDARD DATA FRAME (number of bits = 44 + 8N)
8N (0 < N < 8)
Data Field
8
8
16
CRC Field
15
CRC
END OF
FRAME
d
IDENTIFIER
10 ... 0
Note:
d = dominant
r = recessive
ddd
DATA
LENGTH CODE
Bit Stuffing
Figure 18-3. Standard Data Frame
EXTENDED DATA FRAME (number of bits = 64 + 8N)
Arbitration Field
Control Field
8N (0 < N < 0)
Data Field
11
18
4
8
8
r rrrrr rrr
DS020
16
CRC Field
15
CRC
END OF
FRAME
d
rr
ddd
IDENTIFIER
28 ... 18
IDENTIFIER
17 ... 0
DATA
LENGTH CODE
r rrrrrrrr
Note:
d = dominant
r = recessive
Bit Stuffing
Figure 18-4. Extended Data Frame
DS021
A CAN data frame consists of the following fields:
• Start of Frame (SOF)
• Arbitration Field + Extended Arbitration
• Control Field
• Data Field
• Cyclic Redundancy Check Field (CRC)
• Acknowledgment Field (ACK)
• End of Frame (EOF)
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CAN Module 127