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Transfer
direction
Serial clock
Serial data
RDRF
ORER
RXI interrupt
request
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. 4.0, 04/00, page 558 of 850
Bit 7
Bit 0
Data read from
SCRDR1 and RDRF
flag cleared to 0 in RXI
interrupt handler
One frame
Figure 15.22 Example of SCI Receive Operation
Bit 7
Bit 0
Bit 1
RXI interrupt
request
Bit 6
Bit 7
ERI interrupt
request due to
overrun error
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