SH7750_08 Datasheet, PDF (848/1162 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

Section 16 Serial Communication Interface with FIFO (SCIF)
Figure 16.8 shows an example of the operation for transmission in asynchronous mode.
1
Serial
data
Start
bit
Data
Parity Stop Start
bit bit bit
Data
Parity Stop
bit bit
0 D0 D1
D7 0/1 1 0 D0 D1
D7 0/1 1
1
Idle state
(mark state)
TDFE
TEND
TXI interrupt
request
Data written to SCFTDR2
and TDFE flag read as 1
then cleared to 0 by TXI
interrupt handler
TXI interrupt
request
One frame
Figure 16.8 Example of Transmit Operation
(Example with 8-Bit Data, Parity, One Stop Bit)
4. When modem control is enabled, transmission can be stopped and restarted in accordance with
the CTS2 input value. When CTS2 is set to 1, if transmission is in progress, the line goes to the
mark state after transmission of one frame. When CTS2 is set to 0, the next transmit data is
output starting from the start bit.
Figure 16.9 shows an example of the operation when modem control is used.
Serial data
TxD2
Start
bit
0 D0 D1
Parity Stop
bit bit
D7 0/1 1
Start
bit
0 D0 D1
D7 0/1
CTS2
Drive high before stop bit
Figure 16.9 Example of Operation Using Modem Control (CTS2)
Rev.7.00 Oct. 10, 2008 Page 764 of 1074
REJ09B0366-0700