Datasheet

V850ES/JG3-H, V850ES/JH3-H CHAPTER 20 CAN CONTROLLER

R01UH0042EJ0500 Rev.5.00 Page 897 of 1513

Aug 12, 2011

(2) Remote frame

A remote frame is composed of six fields.

Figure 20-4. Remote Frame

Interframe space

End of frame (EOF)

ACK field

CRC field

Control field

Arbitration field

Start of frame (SOF)

Remote frame

<1> <2> <3> <5> <6> <7> <8>

Remarks 1. The data field is not transferred even if the control field’s data length code is not “0000B”.

2. D: Dominant = 0

R: Recessive = 1

(3) Description of fields

<1> Start of frame (SOF)

The start of frame field is located at the start of a data frame or remote frame.

Figure 20-5. Start of Frame (SOF)

1 bit

Start of frame

(Interframe space or bus idle)

(Arbitration field)

Remark D: Dominant = 0

R: Recessive = 1

• If a dominant level is detected in the bus idle state, a hardware synchronization is performed (the current

TQ is assigned to be the SYNC segment).

• If a dominant level is sampled at the sample point following such a hardware synchronization, the bit is

assigned to be a SOF. If a recessive level is detected, the protocol layer returns to the bus idle state and

regards the preceding dominant pulse as a noise only. In this case an error frame is not generated.