SH7125_08 Datasheet, PDF (481/774 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH™ RISC engine Family

Section 12 Serial Communication Interface (SCI)
Figure 12.13 shows an example of SCI receive operation.
Transfer direction
Synchronization
clock
Serial data
Bit 7
Bit 0
Bit 7
Bit 0
Bit 1
Bit 6 Bit 7
RDRF
ORER
RXI interrupt Data read from SCRDR and RXI interrupt
request
RDRF flag cleared to 0 by RXI request
interrupt handler
One frame
ERI interrupt request
by overrun error
Figure 12.13 Example of SCI Receive Operation
Transmitting and Receiving Serial Data Simultaneously (Clock Synchronous Mode): Figure
12.14 shows a sample flowchart for transmitting and receiving serial data simultaneously.
Use the following procedure for serial data transmission and reception after enabling the SCI for
transmission and reception.
Rev. 4.00 Jul. 25, 2008 Page 461 of 750
REJ09B0243-0400