HD64F2149YV datasheet(498/1075 Pages) RENESAS

498 / 1075 page

Section 15 Serial Communication Interface (SCI, IrDA)

Rev. 3.00 Jan 18, 2006 page 470 of 1044

REJ09B0280-0300

In serial transmission, the SCI operates as described below.

1. The SCI monitors the TDRE flag in SSR, and if it is 0, recognizes that data has been written to

TDR, and transfers the data from TDR to TSR.

2. After transferring data from TDR to TSR, the SCI sets the TDRE flag to 1 and starts

transmission.

If the TIE bit is set to 1 at this time, a transmit-data-empty interrupt (TXI) is generated.

The serial transmit data is sent from the TxD pin in the following order.

a. Start bit:

One 0-bit is output.

b. Transmit data:

8-bit or 7-bit data is output in LSB-first order.

c. Multiprocessor bit

One multiprocessor bit (MPBT value) is output.

d. Stop bit(s):

One or two 1-bits (stop bits) are output.

e. Mark state:

1 is output continuously until the start bit that starts the next transmission is sent.

3. The SCI checks the TDRE flag at the timing for sending the stop bit.

If the TDRE flag is cleared to 0, data is transferred from TDR to TSR, the stop bit is sent, and

then serial transmission of the next frame is started.

If the TDRE flag is set to 1, the TEND flag in SSR is set to 1, the stop bit is sent, and then the

mark state is entered in which 1 is output continuously. If the TEIE bit in SCR is set to 1 at this

time, a transmit-end interrupt (TEI) request is generated.

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