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H8/3003 Datasheet(PDF) 492 Page - Renesas Technology Corp |
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H8/3003 Datasheet(HTML) 492 Page - Renesas Technology Corp |
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492 / 715 page  Figure 13-18 Sample Flowchart for Serial Receiving (2) In receiving, the SCI operates as follows. • The SCI synchronizes with serial clock input or output and initializes internally. • Receive data is stored in RSR in order from LSB to MSB. After receiving the data, the SCI checks that the RDRF flag is 0 so that receive data can be transferred from RSR to RDR. If this check passes, the RDRF flag is set to 1 and the received data is stored in RDR. If the check does not pass (receive error), the SCI operates as indicated in table 13-11. • After setting the RDRF flag to 1, if the RIE bit is set to 1 in SCR, the SCI requests a receive- data-full interrupt (RXI). If the ORER flag is set to 1 and the RIE bit in SCR is also set to 1, the SCI requests a receive-error interrupt (ERI). 3 End Error handling Overrun error handling Clear ORER flag to 0 in SSR 474 |
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