RL78/G13 CHAPTER 12 SERIAL ARRAY UNIT
R01UH0146EJ0100 Rev.1.00 586
Sep 22, 2011
Figure 12-33. Flowchart of Master Transmission (in Continuous Transmission Mode)
Setting transmit data
Write STmn bit to 1
For the initial setting, refer to Figure 12-27.
(Select buffer empty interrupt)
SAU default setting
es
No
o
End of communication
es
o
Communication
continued?
es
Clear SAUmEN bit of the
PER0 register to 0.
Number of
communication data > 0?
<2>
<3>
<4>
<5>
<6>
<1>
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 MDmn0 bit to 0
Writing transmit data to
SIOp (=SDRmn[7:0])
Writing transmit data to
SIOp (=SDRmn[7:0])
If transmit data is left, read them from storage area then
write into SIOp, and update transmit data pointer and
number of transmit data.
If no more transmit data, clear MDmn bit if it’s set. If not,
finish.
Subtract -1 from number of
transmit data
RETI
Transmission completed?
Starting setting
When transfer end interrupt is generated, it moves t
interrupt processing routine.
Buffer empty/transfer end interrupt
Write MDmn0 bit to 1
es
o
MDmn = 1?
Sets communication
completion interrupt flag
Wait for transmit completes
Clear interrupt request flag (XXIF), reset interrupt mask (XXMK) and set
interrupt enable (EI).
Enables interrupt
Disable interru
t
MASK
Check completion of transmission by
verifying transmit end flag
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 routineInterrupt processing routine
Remark <1> to <6> in the figure correspond to <1> to <6> in Figure 12-32 Timing Chart of Master
Transmission (in Continuous Transmission Mode).
<R>
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