Renesas RL78/G15 User Manual

RL78/G15 CHAPTER 12 SERIAL ARRAY UNIT
R01UH0959EJ0110 Rev.1.10 Page 453 of 765
Mar 7, 2023
Figure 12-66. Flowchart of Slave Transmission/Reception (in Continuous Transmission/Reception Mode)
Starting setting
End of communication
Disable interrupt (MASK)
Setting storage area and number of data for transmission/reception data
(Storage area, Transmission/reception data pointer, and number of
communication data are optionally set on the internal RAM by the software)
Clear interrupt request flag (xxIF), reset interrupt mask (xxMK), and
set interrupt enable (EI)
Wait for transmission completes
Subtract –1 from number of
communication data
Read receive data from SIOp
(= SDRmn [7:0])
Number of
communication data
= 0?
RETI
Number of
communication
data?
Buffer empty/transfer end interrupt
SAU initial setting
No
Set STmn bit to 1
Communication continued?
Set MDmn0 bit to 1
Yes
Yes
No
Main routine Interrupt processing routine Main routine
<1>
<3> <6>
<8>
BFFmn = 1?
≥ 2
<4>
<7>
Enables interrupt
Setting transmission/reception data
When buffer empty/transfer end interrupt is generated,
it moves interrupt processing routine
Clear MDmn0 bit to 0
Writing transmit data to SIOp
(= SDRmn [7:0])
<5>
= 1= 0
No
Other than the first interrupt, read reception data then
writes to storage area, update receive data pointer
If transmit data is left (number of communication data ≥ 2),
read it from the storage area and write it to SIOp. Update
storage pointer.
If transmit is completed (number of communication data = 1),
the flow is changed to the transmission completion interrupt.
Start communication when master start providing
the clock
(Caution and Remark are listed on the next page.)
For the initial setting, refer to Figure 12-60.
(Select buffer empty interrupt)

Renesas RL78/G15 Specifications

General

Brand	Renesas
Model	RL78/G15
Category	Microcontrollers
Language	English