SH7615 Datasheet, PDF (644/925 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH
RISC engine Family/SH7600 Series

1
Serial
data
Start
bit
0 D0
Data
Parity Stop Start
bit bit bit
Data
Parity Stop
bit bit
D1
D7 0/1 1 0 D0 D1
D7 0/1 1
1
Idle state
(mark state)
TDFE
TEND
TXI interrupt
request
TXI interrupt
request
Data written to SCFTDR
and TDFE flag cleared
to 0 by TXI interrupt handler
One frame
Figure 14.6 Example of Transmit Operation in Asynchronous Mode
(Example with 8-Bit Data, Parity, One Stop Bit, LSB-First Transfer)
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 14.7 shows an example of the operation when modem control is used.
Serial
data
Start
bit
0 D0 D1
Parity Stop
bit bit
D7 0/1
Start
bit
0 D0 D1
D7 0/1
CTS
Drive high at this point
before stop bit
Figure 14.7 Example of Operation Using Modem Control (CTS)
Rev. 2.00, 03/05, page 606 of 884