Frame Types; Data Frame And Remote Frame - NEC V850ES/F 3-L Series User Manual

Chapter 18

18.2.2 Frame types

Table 18-2
(1)

18.2.3 Data frame and remote frame

(1)
R
D
<1> <2>
Figure 18-3
Note
532
The following four types of frames are used in the CAN protocol.
Frame types
Frame Type Description
Data frame Frame used to transmit data
Remote frame Frame used to request a data frame
Error frame Frame used to report error detection
Frame used to delay the next data frame or remote frame
Overload frame
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.
Data frame
A data frame is composed of seven fields.
Data frame
<3> <4>
Data frame
D: Dominant = 0
R: Recessive = 1
User's Manual U18743EE1V2UM00
CAN Controller (CAN)
<5> <6> <7> <8>
Interframe space
End of frame (EOF)
ACK field
CRC field
Data field
Control field
Arbitration field
Start of frame (SOF)