TC1796
Peripheral Units (Vol. 2 of 2)
Controller Area Network (MultiCAN) Controller
User’s Manual 22-4 V2.0, 2007-07
MultiCAN, V2.0
CAN protocol to the “in-bit-response” group of protocols. The recessive ACK delimiter
bit, which must not be overwritten by a dominant bit, completes the Acknowledge Field.
Seven recessive End-of-Frame (EOF) bits finish the Data Frame. Between any two
consecutive frames, the bus must remain in the recessive state for at least 3 bit times
(called Inter Frame Space). If after the Inter Frame Space, no other nodes attempt to
transmit the bus remains in idle state with a recessive level.
Figure 22-1 CAN Data Frame
1 1 Bus Idle
Dominant Level
Recessive Level
Bus Idle Bus Idle
Dominant Level
Recessive Level
MCT05827
Standard Data Frame
ACK Delimiter
ACK Slot
CRC Delimiter
CRC Sequence
Data Field
Reserved (D)
IDE Bit (D)
RTR Bit (D)
Identifier
411111115
Start of Frame
Control Field
Arbitration
Field (12 bit)
1
7 3
Inter Frame Space
End of Frame (EOF)
Acknowledge
Field
CRC Field
11115 7 3
Extended Data Frame
SRR Bit (R)
IDE Bit (R)
29-bit Identfier
Arbitration
Field (32 bit)
RTR Bit (D)
2 Reserved (D)
0 - 64
Bus Idle 4211 0 - 64
Data Length Code
181 1
11
To Next Page
Loading...
Need help?
General