Fig. 23.5 Transmission Flowchart Of The Can Controller - Fujitsu MB90420/5 (A) Series Hardware Manual

n Transmission flowchart of the CAN controller
Figure 23.5 shows a transmission flowchart of the CAN controller.
A data frame is transmitted.
CAN CONTROLLER
Transmission request
( = 1)
TREQx :
= 1
TCx :
0
TREQx ?
1
0
?
RFW T x
1
?
RRTRx
1
If there are any other message buffers
meeting the above conditions, select the
lowest-numbered message buffer
Is the bus idke?
YES
0
?
TRTRx
Is transmission
successful?
YES
= 0
RRTRx :
= 0
TREQx :
TCx : = 1
?
TI E x
0
Completion of transmission

Fig. 23.5 Transmission Flowchart of the CAN Controller

0
NO
1
A remote frame is transmitted.
NO
1
A transmission complete
interrupt occurs.
23-33
0
?
TCANx
1
TREQx : = 0