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SH7018 Datasheet(PDF) 263 Page - Renesas Technology Corp |
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SH7018 Datasheet(HTML) 263 Page - Renesas Technology Corp |
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263 / 431 page  247 Start of initialization Clear TE and RE bits to 0 in SCR1 1-bit interval elapsed? Set TE and RE to 1 in SCR1; Set RIE, TIE, TEIE, and MPIE bits Yes No (1) Set RIE, TIE, TEIE, MPIE, CKE1, and CKE0 bits in SCR (TE and RE are 0) End Wait Select transmit/receive format in SMR1 Set value in BRR1 (2) (3) (4) Figure 12.15 Sample Flowchart for SCI Initialization Transmitting Serial Data (Clock Synchronous Mode): Figure 12.16 shows a sample flowchart for transmitting serial data and indicates the procedure to follow. 1. SCI1 initialization: Set the TxD pin function with the PFC. 2. SCI1 status check and transmit data write: Read SSR1, check that the TDRE flag is 1, then write transmit data in TDR1 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 TDR1, 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 TDR1, the TDRE flag is checked and cleared automatically. |
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