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Rev. 5.00, 09/03, page 544 of 760
Figure 16.7 shows an example of the operation for transmission.
01
1 1
0/1 0 1
TDFE
TEND
Parity
bit
Parity
bit
Serial
data
Start
bit
Data
Stop
bit
Start
bit
Data
Stop
bit
Idle (mark
)
state
TXI interrupt
request
Data written to
SCFTDR and TDFE
flag read as 1 then
cleared to 0 by TXI
interrupt handler
One frame
D
0
D
1
D
7
D
0
D
1
D
7
0/1
TXI interrupt
request
Figure 16.7 Example of Transmit Operation
(8-Bit Data, Parity, One Stop Bit)
4. When modem control is enabled, transmission can be stopped and restarted in accordance with
the CTS input value. When CTS is set to 1, if transmission is in progress, the line goes to the
mark state after transmission of one frame. When CTS is set to 0, the next transmit data is
output starting from the start bit.
Figure 16.8 shows an example of the operation when modem control is used.
0 0/1 0
CTS
Parity
bit
Serial
data
TXD
Start
bit
Stop
bit
Start
bit
D
0
D
1
D
7
D
0
D
1
D
7
0/1
Rise at this point
before stop bit
Figure 16.8 Example of Operation Using Modem Control (C
CC
CT
TT
TS
SS
S)