Hitachi F-ZTAT H8/3039 Series Hardware Manual page 388

Figure 11-19 shows an example of SCI receive operation.
Serial clock
Serial data
RDRF
ORER
RXI
request
Transmitting and Receiving Serial Data Simultaneously (Synchronous Mode): Figure 11-20
shows a sample flowchart for transmitting and receiving serial data simultaneously and indicates
the procedure to follow.
Receive direction
Bit 7 Bit 0
RXI interrupt handler
reads data in RDR and
clears RDRF flag to 0
1 frame
Figure 11-19 Example of SCI Receive Operation
Bit 7 Bit 0 Bit 1
RXI
request
Bit 6 Bit 7
Overrun error,
ERI request
379