HD6417705F133V Datasheet, PDF (462/741 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7700 Series

Figure 16.9 shows an example of the operation for reception in asynchronous mode.
1
Serial
data
Start
bit
0 D0
Data
Parity Stop Start
bit bit bit
D1
D7 0/1 1 0 D0
Data
Parity Stop
bit bit
D1
D7 0/1 1
1
Idle state
(mark state)
RDF
FER
RXI interrupt
request
One frame
Data read and RDF flag
read as 1 then cleared
to 0 by RXI interrupt
handler
ERI interrupt request
generated by receive
error
Figure 16.9 Example of SCIF Receive Operation
(Example with 8-Bit Data, Parity, One Stop Bit)
• Modem Function
When using a modem function, transmission can be stopped and started again according to the
CTS input value. When the CTS is set to 1 during transmission, the data enters a mark state after
transmitting one frame. When CTS is set to 0, the next transmit data is output starting with a start
bit.
Figure 16.10 shows an example of operation for the CTS control.
Transmit data
TxD
CTS
Start
bit
0 D0 D1
Parity Stop
bit bit
D6 D7 0/1
Transmission stops
when CTS goes high
Start
bit
0 D0 D1
D6 D7 0/1
Transmission starts again
when CTS goes low
Figure 16.10 CTS Control Operation
Rev. 2.00, 09/03, page 414 of 690