Renesas RL78 Series User Manual page 429

RL78/G1D
Figure 13-29. Flowchart of Master Transmission (in Single-Transmission Mode)
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R01UH0515EJ0120 Rev.1.20
Dec 16, 2016
Starting CSI communication
SAU default setting
Setting transmit data
Enables interrupt
Writing transmit data to Read transmit data from storage area and write it
SIOp (=SDRmn[7:0]) to SIOp. Update transmit data pointer.
Wait for transmit completes
Transfer end interrupt
Transmitting next data?
Yes
Writing transmit data to
SIOp (=SDRmn[7:0])
RETI
Transmission completed?
Yes
Disable interrupt (MASK)
Write 1 to STmn bit
End of communication
CHAPTER 13 SERIAL ARRAY UNIT
For the initial setting, refer to Figure 13-24.
(Select Transfer end interrupt)
Set data for transmission and the number of data. Clear communication end flag
(Storage area, Transmission data pointer, Number of communication data and
Communication end flag are optionally set on the internal RAM by the software)
Clear interrupt request flag (XXIF), reset interrupt mask (XXMK) and set
interrupt enable (EI).
When Transfer end interrupt is generated, it
moves to interrupt processing routine
No
Read transmit data, if any, from storage area and
Sets communication
write it to SIOp. Update transmit data pointer.
completion flag
If not, set transmit end flag
Check completion of transmission by
verifying transmit end flag
Writing to SIOp makes SOp and
SCKp signals out
(communication starts)
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