CHAPTER 11 FCAN CONTROLLER
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User’s Manual U14492EJ3V0UD
11.7.2 Message formats
Four types of frames are used in CAN protocol messages. The output conditions for each type of frame are as
follows.
• Data frame:
Frame used for transmit data
• Remote frame:
Frame used for transmit requests from receiving side
• Error frame:
Frame that is output when an error has been detected
• Overload frame: Frame that is output when receiving side is not ready
Remark
Dominant (D):
Dominant in wired OR
Recessive (R):
Recessive in wired OR
In the figure shown below, (D) = 0 and (R) = 1.
(1) Data frame and remote frame
<1> Data frame
A data frame is the frame used for transmit data.
This frame is composed of seven fields.
Figure 11-7. 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>
Содержание V850E/IA1 mPD703116
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