Frame Types; Data Frame And Remote Frame - NEC Renesas V850/SC1 User Manual

19.10.2 Frame types

Following four types of frames are used in CAN protocol.
Frame Type
Data frame
Remote frame
Error frame
Overload frame
(1) Bus value
The bus values are divided into dominant and recessive.
• Dominant level is indicated by logical 0.
• Recessive level is indicated by logical 1.
• When a dominant level and a recessive level are transmitted simultaneously, the bus value becomes
dominant level.

19.10.3 Data frame and remote frame

(1) Data frame
A data frame is composed of seven fields.
R
D
<1> <2>
Remark D: Dominant = 0
R: Recessive = 1
CHAPTER 19 FCAN CONTROLLER (V850/SC3)
Table 19-16.
Frame used to transmit data
Frame used to request a data frame
Frame used to report error detection
Frame used to delay the next data frame or remote frame
Figure 19-11. Data Frame
Data frame
<3> <4>
User's Manual U15109EJ3V0UD
Frame Type
Description
<5> <6> <7>
ACK field
CRC field
Data field
Control field
Arbitration field
Start of frame (SOF)
<8>
Interframe space
End of frame (EOF)
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