549
Figure 16.7 shows an example of the operation for transmission.
0
1
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 (
CTS
)
Содержание SH7709S
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Страница 292: ...273 T1 CKIO A25 to A0 CSn RD WR RD D31 to D0 WEn D31 to D0 BS T2 Read Write Figure 10 6 Basic Timing of Basic Interface ...
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