NEC V850ES/F 3-L Series User Manual page 533

CAN Controller (CAN)
(2)
R
D
<1>
Figure 18-4
Note
(3)
Figure 18-5
Note
Remote frame
A remote frame is composed of six fields.
Remote frame
<2> <3> <5>
Remote frame
1. The data field is not transferred even if the control field's data length code
is not "0000 ".
B
2. D: Dominant = 0
R: Recessive = 1
Description of fields
(a) Start of frame (SOF)
The start of frame field is located at the start of a data frame or remote frame.
(Interframe space or bus idle)
Start of frame (SOF)
D: Dominant = 0
R: Recessive = 1
• If dominant level is detected in the bus idle state, a hard-synchronization is
performed (the current TQ is assigned to be the SYNC segment).
• If dominant level is sampled at the sample point following such a
hard-synchronization, the bit is assigned to be a SOF. If recessive level is
detected, the protocol layer returns to the bus idle state and regards the
preceding dominant pulse as a disturbance only. No error frame is
generated in such case.
User's Manual U18743EE1V2UM00
<6> <7> <8>
Start of frame
R
D
1 bit
Chapter 18
Interframe space
End of frame (EOF)
ACK field
CRC field
Control field
Arbitration field
Start of frame (SOF)
(Arbitration field)
533