Transmission - Fujitsu MB90895 Series Hardware Manual

CHAPTER 16 CAN controller
16.5.1

Transmission

Figure 16.5-1 shows a transmission flowchart.
I Transmission procedure
536
Figure 16.5-1 Transmission Flowchart
Set transmission request register
(TREQR:TREQx=1)
Clear transmission completio register
(TCR:TCx=0)
NO:0
Set transmission request?
(TREQR:TREQx)
YES:1
NO:0
Remote frame reception waiting?
(RFWTR:RFWTx)
YES:1
Remote frame reception?
(RRTRR:RRTRx)
YES:1
If there remains message buffer meeting
transmission conditions, the lowest-numbered
message buffer is selected.
Bus idle state?
YES
TRTRx=0
How is fram setting?
(TRTRR:TRTRx)
Transmit data frame
Transmission seccessed?
YES
Transmission request register is cleared (TREQR:TREQx=0)
Reception RTR register is cleared (RRTRR:RRTRx=0)
Transmission complete register is set (TCR:TCx=1)
Transmission complete interrupt enabled ?
(TIER:TIEx=1)
NO:0
Transmission operating finish
NO:0
NO
TRTRx=1
Tranmit remote frame
NO
Cancel transmission?
Clear transmission request register
(TREQR:TREQx=0)
YES:1
Transmission complete interrupt
request is output
NO:0
(TCANR:TCANx)
YES:1