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Start
1
bit
Serial
0
D0
data
TDFE
TEND
TXI interrupt
request
Data written to SCFTDR2
and TDFE flag read as 1
then cleared to 0 by TXI
interrupt handler
4. When modem control is enabled, transmission can be stopped and restarted in accordance with
the &765 input value. When &765 is set to 1, if transmission is in progress, the line goes to the
mark state after transmission of one frame. When &765 is set to 0, the next transmit data is
output starting from the start bit.
Figure 16.10 shows an example of the operation when modem control is used.
Start
bit
Serial data
0
TxD2
CTS2
Figure 16.10 Example of Operation Using Modem Control (&765
Data
Parity
bit
D1
D7
0/1
One frame
Figure 16.9 Example of Transmit Operation
(Example with 8-Bit Data, Parity, One Stop Bit)
Parity
bit
D0
D1
D7 0/1
Drive high before stop bit
Stop
Start
bit
bit
1
0
D0
D1
TXI interrupt
request
Stop
bit
1
Data
Parity
Stop
bit
bit
D7
0/1
1
Start
bit
0
D0 D1
&765)
&765
&765
Rev. 4.0, 04/00, page 601 of 850
1
Idle state
(mark state)
D7 0/1
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