3069RF-ZTAT Datasheet, PDF (528/1003 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER

Figure 13.19 shows an example of SCI receive operation.
Serial clock
Serial data
Bit 7 Bit 0
Bit 7 Bit 0 Bit 1
Bit 6 Bit 7
RDRF
ORER
RXI interrupt
request
RXI interrupt handler
reads data in RDR and
clears RDRF flag to 0
RXI interrupt
request
Overrun error,
ERI interrupt
request
1 frame
Figure 13.19 Example of SCI Receive Operation
Rev. 5.0, 09/04, page 506 of 978