Fujitsu MB90390 Series Hardware Manual page 531

■ Transmission Flowchart of the CAN Controller
A data frame is transmitted.
Figure 23.7-1 Transmission Flowchart of the CAN Controller
Transmission request
(TREQx := 1)
TCx := 0
0
TREQx?
0
RFWTx?
RRTRx?
If there are any other message buffers
meeting the above conditions, select
the lowest-numbered message buffer.
Is the bus idle?
YES
0
TRTRx?
Is transmission
successful?
YES
RRTRx : = 0
TREQx := 0
TCx
TIEx ?
0
End of transmission
1
1
0
1
NO
1
A remote frame is transmitted.
NO
:= 1
1
A transmission complete
interrupt occurs.
CHAPTER 23 CAN CONTROLLER
0
TCANx?
1
TREQx := 0
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