Renesas RL78/G1P Hardware User Manual page 384

RL78/G1P
Figure 11-45. Flowchart of Master Transmission/Reception (in Single-Transmission/Reception Mode)
No
R01UH0895EJ0100 Rev.1.00
Nov 29, 2019
Starting CSI communication
Setting
transmission/reception data
Enables interrupt
Writing transmit data to
SIOp (=SDRmn[7:0])
Wait for transmission/reception
completes
Transfer end interrupt
Read receive data to SIOp
(=SDRmn[7:0])
RETI
Transmission/reception
completed?
Yes
Disable interrupt (MASK)
Write STmn bit to 1
End of communication
CHAPTER 11 SERIAL ARRAY UNIT
For the initial setting, see Figure 11-41.
(Select transfer end interrupt)
Setting storage data and number of data for transmission/reception data
(Storage area, Transmission data pointer, Reception 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)
Read transmit data from storage area and write it
to SIOp. Update transmit data pointer.
When transfer end interrupt is generated, it
moves to interrupt processing routine.
Read receive data then writes to storage area, update receive
data pointer
If there are the next data, it continues
Writing to SIOp makes SOp
and SCKp signals out
(communication starts)
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