Rev. 2.00, 09/03, page 414 of 690
Figure 16.9 shows an example of the operation for reception in asynchronous mode.
RDF
FER
ERI interrupt request
generated by receive
error
One frame
Data read and RDF flag
read as 1 then cleared
to 0 by RXI interrupt
handler
RXI interrupt
request
0
1
1
1
0/1
0
1
Parity
bit
Parity
bit
Serial
data
Start
bit
Start
bit
Data
Data
Stop
bit
Stop
bit
Idle state
(mark state)
D0
D1
D7
D0
D1
D7
0/1
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.
CTS
Transmission stops
when CTS goes high
Transmission starts again
when CTS goes low
0
D0
D1
D6
D7
0/1
0
D0
D1
D6
D7
0/1
Start
bit
Transmit data
TxD
Parity
bit
Stop
bit
Start
bit
Figure 16.10
CTS Control Operation
Summary of Contents for SH7705
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