Renesas RL78/G1P Hardware User Manual page 366

RL78/G1P
Figure 11-29. Flowchart of Master Transmission (in Single-Transmission Mode)
No
R01UH0895EJ0100 Rev.1.00
Nov 29, 2019
Starting CSI communication
SAU default setting
Setting transmit data
Enables interrupt
Read transmit data from storage area and write it
Writing transmit data to
to SIOp. Update transmit data pointer.
SIOp (=SDRmn[7:0])
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 STmn bit to 1
End of communication
CHAPTER 11 SERIAL ARRAY UNIT
For the initial setting, see Figure 11-25.
(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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