SH7641 Datasheet, PDF (779/1036 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH™ RISC engine Family / SH7641 Series

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