Transfer
direction
Serial clock
Serial data
Bit 7
Bit 0
Bit 7
Bit 0
Bit 1
Bit 6 Bit 7
RDRF
ORER
Data read from
RXI interrupt
request
ERI interrupt
request due to
overrun error
RXI interrupt
request
SCRDR1 and RDRF
flag cleared to 0 in RXI
interrupt handler
One frame
Figure 15.22 Example of SCI Receive Operation
Simultaneous Serial Data Transmission and Reception (Synchronous Mode): Figure 15.23
shows a sample flowchart for simultaneous serial transmit and receive operations.
Use the following procedure for simultaneous serial data transmit and receive operations after
enabling the SCI for transmission and reception.
Rev. 6.0, 07/02, page 649 of 986
RENESAS [ RENESAS TECHNOLOGY CORP ]
