Figure 19.5 Example Of Transmit Operation (8-Bit Data, Parity, One Stop Bit); Figure 19.6 Example Of Operation Using Modem Control (Cts) - Renesas HD6417641 Hardware Manual

Figure 19.5 shows an example of the operation for transmission.
Start
1
bit
Serial
0
data
TDFE
TEND
TXI interrupt
request
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.
Start
bit
Serial data
TxD
CTS

Figure 19.6 Example of Operation Using Modem Control (CTS)

Data Parity
bit
D0 D1 D7 0/1
Data written to SCFTDR
and TDFE flag read as 1
then cleared to 0 by TXI
interrupt handler
One frame
Figure 19.5 Example of Transmit Operation
(8-Bit Data, Parity, One Stop Bit)
Parity
bit
0 D0 D1 D7 0/1
Drive high before stop bit
Section 19 Serial Communication Interface with FIFO (SCIF)
Stop Start Data
bit bit
1 0 D0 D1
TXI interrupt
request
Stop Start
bit bit
1
Rev. 4.00 Sep. 14, 2005 Page 729 of 982
Parity Stop
bit bit
Idle state
D7 0/1 1
(mark state)
0 D0 D1 D7 0/1
REJ09B0023-0400
1