Renesas SH7641 - Manual (Page 779)

Section 19 Serial Communication Interface with FIFO (SCIF)
Rev. 4.00 Sep. 14, 2005 Page 729 of 982
REJ09B0023-0400
Figure 19.5 shows an example of the operation for transmission.
1
0 D0 D1 D7 0/1 1 0 D0 D1 D7 0/1 1
1
TDFE
TEND
Serial
data
Start
bit Data Parity
bit Stop
bit Start
bit
Idle state
(mark state)
Data Parity
bit Stop
bit
TXI interrupt
request
Data written to SCFTDR
and TDFE flag read as 1
then cleared to 0 by TXI
interrupt handler
One frame
TXI interrupt
request
Figure 19.5 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 19.6 shows an example of the operation when modem control is used.
Serial data
TxD
0 D0 D1 D7 0/1 0 1 D0 D1 D7 0/1
CTS
Drive high before stop bit
Start
bit Parity
bit Stop
bit Start
bit
Figure 19.6 Example of Operation Using Modem Control (
CTS)