SH7709S Datasheet, PDF (588/807 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer Super RISC engine Family/SH7700 Series

Figure 16.7 shows an example of the operation for transmission.
1
Serial
data
Start
bit
0 D₀
Parity Stop Start
Data bit bit bit
D₁
D₇ 0/1 1 0 D₀
Parity Stop
Data bit bit 1
D₁
D₇ 0/1 1 ^{Idle (mark)}
state
TDFE
TEND
TXI interrupt
request
Data written to
SCFTDR and TDFE
flag read as 1 then
cleared to 0 by TXI
interrupt handler
TXI interrupt
request
One frame
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.
Serial
data
TXD
CTS
Start
bit
0 D₀ D₁
Parity Stop
bit bit
D₇ 0/1
Start
bit
0 D₀ D₁
D₇ 0/1
Rise at this point
before stop bit
Figure 16.8 Example of Operation Using Modem Control (CTS)
Rev. 5.00, 09/03, page 544 of 760