SH7014 datasheet(388/754 Pages) RENESAS

388 / 754 page

12. Serial Communication Interface (SCI)

Rev.5.00 Sep. 27, 2007 Page 354 of 716

REJ09B0398-0500

Start of initialization

Clear TE and RE bits to 0 in SCR

1-bit interval elapsed?

Set TE and RE to 1 in SCR;

Set RIE, TIE, TEIE, and MPIE bits

Yes

Set RIE, TIE, TEIE, MPIE, CKE1,

and CKE0 bits in SCR

(TE and RE are 0)

End

Wait

Select transmit/receive

format in SMR

Set value in BRR

Figure 12.15 Sample Flowchart for SCI Initialization

Transmitting Serial Data (Synchronous Mode): Figure 12.16 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.

SH7014 Datasheet(PDF) 388 Page - Renesas Technology Corp