cp3cn23 National Semiconductor Corporation, cp3cn23 Datasheet - Page 86
cp3cn23
Manufacturer Part Number
cp3cn23
Description
Cp3cn23 Reprogrammable Connectivity Processor With Dual Can Interfaces
Manufacturer
National Semiconductor Corporation
Datasheet
1.CP3CN23.pdf
(246 pages)
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A CAN data frame consists of the following fields:
T Start of Frame (SOF)
T Arbitration Field + Extended Arbitration
T Control Field
T Data Field
T Cyclic Redundancy Check Field (CRC)
A remote frame is comprised of the following fields, which is
the same as a data frame (see CAN Frame Fields on page
84) except for the data field, which is not present.
T Start of Frame (SOF)
T Arbitration Field + Extended Arbitration
T Control Field
T Cyclic Redundancy Check Field (CRC)
T Acknowledgment field (ACK)
T End of Frame (EOF)
Note that the DLC must have the same value as the corre-
sponding data frame to prevent contention on the bus. The
RTR bit is “recessive”.
Note:
d = dominant
r = recessive
d
IDENTIFIER
28 ... 18
11
Note:
d = dominant
r = recessive
d
r r
Arbitration Field
Arbitration Field
IDENTIFIER
10 ... 0
11
Figure 21. Extended Remote Frame
Figure 20. Standard Remote Frame
EXTENDED REMOTE FRAME (number of bits = 64)
IDENTIFIER
STANDARD REMOTE FRAME (number of bits = 44)
17 ... 0
d d d
18
Control Field
LENGTH CODE
DATA
4
86
r d d
T Acknowledgment Field (ACK)
T End of Frame (EOF)
Remote Frame
Figure 20 shows the structure of a standard remote frame.
Figure 21 shows the structure of an extended remote frame.
Control Field
LENGTH CODE
CRC Field
CRC
DATA
15
16
4
r
CRC Field
CRC
15
r r
16
r r
END OF
FRAME
r r
DS022
r r
r
r r
r r
END OF
FRAME
r r
DS023
r r
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