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RL78/G1A CHAPTER 12 SERIAL ARRAY UNIT
R01UH0305EJ0200 Rev.2.00 464
Jul 04, 2013
Figure 12-45. Flowchart of Master Transmission/Reception (in Single-Transmission/Reception Mode)
Star
t
ing CSI communication
Disable interrupt (MASK)
Transmission/reception
completed?
No
Yes
End of communication
Read receive data to SIOp
(=SDRmn[7:0])
Writing transmit data to
SIOp (=SDRmn[7:0])
When transfer end interrupt is generated, it
moves to interrupt processing routine.
Wait for transmission/reception
completes
For the initial setting, see Figure 12-42.
(Select transfer end interrupt)
SAU default setting
Transfer end interrupt
Read receive data then writes to storage area, update receive
data pointer
RETI
If there are the next data, it continues
Write 1 to STmn bit
Setting
transmission/reception data
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)
Enables interrupt
Clear interrupt request flag (XXIF), reset interrupt mask (XXMK) and set
interrupt enable (EI)
Writing to SIOp makes SOp
and SCKp signals out
(communication starts)
Read transmit data from storage area and write it
to SIOp. Update transmit data pointer.
Main routine
Main routine
Interrupt processing routine
Remark m: Unit number (m = 0, 1), n: Channel number (n = 0 to 3), p: CSI number (p = 00, 01, 10, 11, 20, 21),
mn = 00 to 03, 10, 11
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