Datasheet

V850ES/JG3-H, V850ES/JH3-H CHAPTER 20 CAN CONTROLLER
R01UH0042EJ0500 Rev.5.00 Page 896 of 1513
Aug 12, 2011
20.2.2 Frame types
The following four types of frames are used in the CAN protocol.
Table 20-2. 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
Overload frame Frame used to delay the next data frame or remote 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.
20.2.3 Data frame and remote frame
(1) Data frame
A data frame is composed of seven fields.
Figure 20-3. Data Frame
R
D
Interframe space
End of frame (EOF)
ACK field
CRC field
Data field
Control field
Arbitration field
Start of frame (SOF)
Data frame
<1> <2> <3> <4> <5> <6> <7> <8>
Remark D: Dominant = 0
R: Recessive = 1