Figure 16.9 Example Of Transmit Operation (Example With 8-Bit Data, Parity, One Stop Bit); Figure 16.10 Example Of Operation Using Modem Control (Cts2) - Hitachi SH7751 Hardware Manual

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 input value. When
mark state after transmission of one frame. When
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 (CTS2)

Rev. 3.0, 04/02, page 670 of 1064
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)

is set to 1, if transmission is in progress, the line goes to the
Parity
bit
D0 D1 D7 0/1
Drive high before stop bit
Stop Start Data
bit bit
1 0 D0 D1
TXI interrupt
request

is set to 0, the next transmit data is
Stop
bit
1
Parity Stop
bit bit
Idle state
D7 0/1 1
(mark state)
Start
bit
0 D0 D1 D7 0/1
1