HD6417615 Hitachi Semiconductor, HD6417615 Datasheet - Page 623

• Manufacturer Part Number: HD6417615
• Description: Hardware Manual
• Manufacturer: Hitachi Semiconductor

610
Serial clock
Serial data
RDF
ORER
Simultaneous Serial Data Transmission and Reception (Synchronous Mode)
Figure 14.22 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 SCIF for transmission and reception.
Figure 14.21 Example of SCIF Receive Operation (Example of LSB-First Transfer)
Transfer
direction
RXI interrupt
request
Bit 7
Data read from SCFRDR
and RDF flag cleared to 0
by RXI interrupt handler
Bit 0
One frame
Bit 7
RXI interrupt
request
Bit 0
Bit 1
Bit 6
ERI interrupt
request due
to overrun error
Bit 7