Renesas rl78 User Manual

RL78/G1A

CHAPTER 12 SERIAL ARRAY UNIT

R01UH0305EJ0200 Rev.2.00

454

Jul 04, 2013

Figure 12-37. Flowchart of Master Reception (in Single-Reception Mode)

Starting CSI communication

Writing dummy data to

SIOp (=SDRmn[7:0])

Write 1 to STmn bit

All reception completed?

Yes

End of communication

Reading receive data from

SIOp (=SDRmn[7:0])

For the initial setting, see Figure 12-34.
(Select Transfer end interrupt)

SAU default setting

Wait for receive completes

When transfer end interrupt is generated, it moves

to interrupt processing routine

Writing to SIOp makes SCKp signals out

(communication starts)

RETI

Transfer end interrupt

generated?

Setting receive data

Setting storage area of the receive data, number of communication data

(Storage area, Reception data pointer, Number of communication data and

Communication end flag are optionally set on the internal RAM by the software)

Read receive data then writes to storage area.

Update receive data pointer and number of

communication data.

Enables interrupt

Clear interrupt request flag (XXIF), reset interrupt mask (XXMK) and set

interrupt enable (EI)

Disable interrupt (MASK)

Check the number of communication data

Main routine

Main r

outine

roc
es
sin
g

tin

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

<R>