Hitachi SH7750 Hardware Manual page 742

Sh7750 series superh risc engine

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TXI interrupt

Data written to SCFTDR2

and TDFE flag read as 1

then cleared to 0 by TXI

interrupt handler

4. When modem control is enabled, transmission can be stopped and restarted in accordance with

the CTS2 input value. When CTS2 is set to 1, if transmission is in progress, the line goes to the

mark state after transmission of one frame. When CTS2 is set to 0, the next transmit data is

output starting from the start bit.

Figure 16.9 shows an example of the operation when modem control is used.

Figure 16.9 Example of Operation Using Modem Control (CTS2

Rev. 6.0, 07/02, page 692 of 986

Figure 16.8 Example of Transmit Operation

(Example with 8-Bit Data, Parity, One Stop Bit)

Drive high before stop bit

TXI interrupt

(mark state)

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