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H8/3021 Datasheet(PDF) 408 Page - Renesas Technology Corp |
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H8/3021 Datasheet(HTML) 408 Page - Renesas Technology Corp |
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408 / 712 page  11. Serial Communication Interface Rev.2.00 Mar. 22, 2007 Page 384 of 684 REJ09B0352-0200 3 End Error handling Overrun error handling Clear ORER flag to 0 in SSR Figure 11.18 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 11.11. If any receive error is detected, the subsequent data transmission/reception is disabled. • 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). |
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