UPD78F1502AGK-GAK-AX Datasheet, PDF (555/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 14 SERIAL ARRAY UNIT
Figure 14-81. Flowchart of UART Reception
Starting UART communication
Setting SAU1EN and SAU0EN
bits of PER0 register to 1
Setting transfer rate by
SPSm register
SMRmn, SMRmr, SCRmn: Setting communication
SDRmn[15:9]:
Setting transfer rate
SOm:
Set CKOmn and SOmn bits to 1
Perform initial setting when
SEmn = 0.
Port manipulation
Writing 1 to SSmn bit
Detecting start bit
Starting reception
Transfer end interrupt
generated?
Yes
No
No
Error interrupt generated?
Reading RXDq register
(SDRmn[7:0])
Yes
Error processing
Reception completed?
No
Yes
Writing 1 to STmn bit
Clearing SAU1EN and SAU0EN
bits of PER0 register to 0
End of UART 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
539
Jun 20, 2011