r5f71374an80fpv Renesas Electronics Corporation., r5f71374an80fpv Datasheet - Page 597

• Manufacturer Part Number: r5f71374an80fpv
• Description: 32-bit Risc Microcomputer Superh?? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

In serial transmission, the SCI operates as described below.
1. The SCI monitors the TDRE flag in the serial status register (SCSSR). If it is cleared to 0, the
2. After transferring data from SCTDR to SCTSR, the SCI sets the TDRE flag to 1 and starts
3. The SCI checks the TDRE flag at the timing for sending the stop bit.
SCI recognizes that data has been written to the transmit data register (SCTDR) and transfers
the data from SCTDR to the transmit shift register (SCTSR).
transmission. If the TIE bit in the serial control register (SCSCR) is set to 1 at this time, a
transmit-data-empty interrupt (TXI) request is generated.
The serial transmit data is sent from the TXD pin in the following order.
A. Start bit: One-bit 0 is output.
B. Transmit data: 8-bit or 7-bit data is output in LSB-first order.
C. Parity bit or multiprocessor bit: One parity bit (even or odd parity) or one multiprocessor
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
If the TDRE flag is 0, the data is transferred from SCTDR to SCTSR, the stop bit is sent, and
then serial transmission of the next frame is started.
If the TDRE flag is 1, the TEND flag in SCSSR is set to 1, the stop bit is sent, and then the
"mark state" is entered in which 1 is output. If the TEIE bit in SCSCR is set to 1 at this time, a
TEI interrupt request is generated.
bit is output. (A format in which neither parity nor multiprocessor bit is output can also be
selected.)
sent.
Section 14 Serial Communication Interface (SCI)
Rev. 1.00 Sep. 21, 2007 Page 571 of 1124
REJ09B0402-0100