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SH7708 数据表(PDF) 387 Page - Renesas Technology Corp |
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SH7708 数据表(HTML) 387 Page - Renesas Technology Corp |
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387 / 633 page  369 Initialize Clear TE and RE bits in SCSCR to 0 Select transmit/receive format in SCSMR Set value to SCBRR Set CKE1 and CKE0 bits in SCSCR (TE and RE bits are 0) Wait Set TE and RE bits in SCSCR to 1 and set RIE, TEIE, and MPIE bits Has a 1-bit interval elapsed? End (2) (3) (1) (4) No Yes Note: Numbers in parentheses refer to the preceding procedure. Figure 13.4 Sample Flowchart for SCI Initialization Transmitting Serial Data (Asynchronous Mode): Figure 13.5 shows a sample flowchart for transmitting serial data. The procedure for transmitting serial data is: 1. SCI status check and transmit data write: Read the serial status register (SCSSR), check that the TDRE bit is 1, then write transmit data in the transmit data register (SCTDR) and clear TDRE to 0. 2. To continue transmitting serial data: Read the TDRE bit to check whether it is safe to write (if it reads 1); if so, write data in SCTDR, then clear TDRE to 0. 3. To output a break at the end of serial transmission: Clear the SPB0DT bit in the SCSPTR, set the SPB0IO bit to 1 and then clear the TE bit to 0 in SCSCR. |
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