SH7785 Datasheet, PDF (1110/1692 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

21. Serial Communication Interface with FIFO (SCIF)
Figure 21.10 shows an example of the operation for transmission in asynchronous mode.
Idle state
(mark state)
1
SCIF_TXD 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
TXI interrupt
request _{Data written to SCFTDR} request
and TDFE read as 1 then
cleared to 0 by TXI
interrupt handler
One frame
Figure 21.10 Example of SCIF Transmission 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 SCIF_CTS input value. When SCIF_CTS is set to 1 during transmission, the SCIF goes to
the mark state after transmission of one frame. When SCIF_CTS is set to 0, the next transmit
data is output starting from the start bit.
Figure 21.11 shows an example of the operation when modem control is used.
Serial data
SCIF_TXD
Start
bit
0 D0 D1
ParityStop
bit bit
D7 0/1
Start
bit
0 D0 D1
D7 0/1
SCIF_CTS
Drive high before stop bit
Figure 21.11 Example of Operation Using Modem Control (SCIF_CTS)
(Only in Channel 0)
Rev.1.00 Jan. 10, 2008 Page 1080 of 1658
REJ09B0261-0100