UPD78F1502AGK-GAK-AX Datasheet, PDF (533/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 14 SERIAL ARRAY UNIT
Figure 14-65. Flowchart of Slave Transmission/Reception (in Single- Transmission/Reception Mode)
Starting CSI communication
Setting SAU1EN and SAU0EN
bits of PER0 register to 1
Setting transfer rate by
SPSm register
SMRmn, SCRmn:
SDRmn[15:9]:
SOm, SOEm:
Setting communication
Setting transfer rate
Setting output
Perform initial setting when SEmn = 0.
Port manipulation
Writing 1 to SSmn bit
Writing transmit data to
SIOp (=SDRmn[7:0])
Starting transmission/reception
No
Transfer end interrupt
generated?
Yes
Reading
SIOp (=SDRmn[7:0])
register
No
Transmission/reception
completed?
Yes
Writing 1 to STmn bit
Clearing SAU1EN and SAU0EN
bits of PER0 register to 0
End of communication
Caution After setting the SAUmEN to 1, be sure to set the SPSm register after 4 or more clocks have
elapsed.
R01UH0004EJ0501 Rev.5.01
517
Jun 20, 2011