HD6417618A datasheet(402/646 Pages) RENESAS

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Section 14 Serial Communication Interface with FIFO (SCIF)

Rev. 6.00 Jun. 12, 2007 Page 370 of 610

REJ09B0131-0600

Figure 14.5 shows an example of the operation for transmission.

0/1

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 14.5 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 14.6 shows an example of the operation when modem control is used (only for

channel 0).

Serial data

TxD

0/1

D7 0/1

CTS

Drive high before stop bit

Start

bit

Parity

bit

Stop

bit

Start

bit

Figure 14.6 Example of Operation Using Modem Control (

CTS)

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