SH7040 Datasheet, PDF (562/923 Pages) Renesas Technology Corp – Renesas 32-Bit Single-Chip RISC Microprocessor SuperH RISC engine Family/SH7040 Series(CPU Core SH-2)

Transmitting Serial Data (Synchronous Mode): Figure 14.18 shows a sample flowchart for
transmitting serial data and indicates the procedure to follow.
1. SCI initialization: Set the TxD pin function with the PFC.
2. SCI status check and transmit data write: Read SSR, check that the TDRE flag is 1, then write
transmit data in TDR and clear the TDRE flag to 0.
3. To continue transmitting serial data: After checking that the TDRE flag is 1, indicating that
data can be written, write data in TDR, then clear the TDRE flag to 0. When the DMAC or
DTC is activated by a transmit-data-empty interrupt request (TxI) to write data in TDR, the
TDRE flag is checked and cleared automatically.
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