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SH7052 Datasheet(PDF) 513 Page - Renesas Technology Corp |
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SH7052 Datasheet(HTML) 513 Page - Renesas Technology Corp |
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513 / 919 page  487 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 No 1 Set CKE1 and CKE0 bits in SCR (RIE, TIE, TEIE, MPIE,TE, and RE are 0) End of initialization Wait Select transmit/receive format in SMR and SDCR Set value in BRR 2 3 4 Figure 14.18 Sample Flowchart for SCI Initialization Transmitting Serial Data (Synchronous Mode): Figure 14.19 shows a sample flowchart for transmitting serial data. The procedure is as follows (the steps correspond to the numbers in the flowchart): 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 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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