HD6433044 Datasheet, PDF (500/867 Pages) Hitachi Semiconductor – Hitachi Single-Chip Microcomputer

Figure 13-19 shows an example of SCI receive operation.
Serial clock
Receive direction
Serial data
RDRF
Bit 7 Bit 0
Bit 7 Bit 0 Bit 1
Bit 6 Bit 7
ORER
RXI
request
RXI interrupt
handler reads
data in RDR
and clears
RDRF flag to 0
1 frame
RXI
request
Overrun error,
ERI request
Figure 13-19 Example of SCI Receive Operation
Transmitting and Receiving Serial Data Simultaneously (Synchronous Mode): Figure 13-20
shows a sample flowchart for transmitting and receiving serial data simultaneously and indicates
the procedure to follow.
489