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H8/3021 Datasheet(PDF) 404 Page - Renesas Technology Corp |
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H8/3021 Datasheet(HTML) 404 Page - Renesas Technology Corp |
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404 / 712 page  11. Serial Communication Interface Rev.2.00 Mar. 22, 2007 Page 380 of 684 REJ09B0352-0200 Transmitting Serial Data (Synchronous Mode): Figure 11.16 shows a sample flowchart for transmitting serial data and indicates the procedure to follow. Start transmitting Read TDRE flag in SSR TDRE = 1? Write transmit data in TDR and clear TDRE flag to 0 in SSR End 1 2 3 No Yes No Yes SCI initialization: the transmit data output function of the TxD pin is selected automatically. 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. Read TEND flag in SSR No Yes 1. 2. 3. Initialize Clear TE bit to 0 in SCR 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. All data transmitted? TEND = 1? Figure 11.16 Sample Flowchart for Serial Transmitting |
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