SH7080_09 Datasheet, PDF (897/1622 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family

Section 16 Serial Communication Interface with FIFO (SCIF)
Figure 16.5 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
TXIF interrupt
request
Data written to SCFTDR
and TDFE flag read as 1
then cleared to 0 by TXIF
interrupt handler
TXIF interrupt
request
One frame
Figure 16.5 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 16.6 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
Start
bit
0 D0 D1
D7 0/1
CTS
Drive high before stop bit
Figure 16.6 Example of Operation Using Modem Control (CTS)
Rev. 4.00 Dec. 15, 2009 Page 837 of 1558
REJ09B0181-0400