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SH7101 Datasheet(PDF) 356 Page - Renesas Technology Corp |
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SH7101 Datasheet(HTML) 356 Page - Renesas Technology Corp |
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356 / 560 page ![]() Section 10 Serial Communication Interface (SCI) Rev.1.00 Sep. 18, 2008 Page 322 of 522 REJ09B0069-0100 10.6.4 Serial Data Reception (Clocked Synchronous Mode) Figure 10.18 shows an example of SCI operation for reception in clocked synchronous mode. In serial reception, the SCI operates as described below. 1. The SCI performs internal initialization in synchronization with a synchronization clock input or output, starts receiving data, and stores the received data in RSR. 2. If an overrun error (when reception of the next data is completed while the RDRF flag is still set to 1) occurs, the ORER bit in SSR is set to 1. If the RIE bit in SCR is set to 1 at this time, an ERI interrupt request is generated. Receive data is not transferred to RDR. The RDRF flag remains to be set to 1. 3. If reception finishes successfully, the RDRF bit in SSR is set to 1, and receive data is transferred to RDR. If the RIE bit in SCR is set to 1 at this time, an RXI interrupt request is generated. Because the RXI interrupt processing routine reads the receive data transferred to RDR before reception of the next receive data has finished, continuous reception can be enabled. Bit 7 Serial data Synchroniza- tion clock 1 frame RDRF ORER Bit 0 Bit 7 Bit 0 Bit 1 Bit 6 Bit 7 RXI interrupt request generated RDR data read and RDRF flag cleared to 0 in RXI interrupt processing routine ERI interrupt request generated by overrun error RXI interrupt request generated Figure 10.18 Example of SCI Operation in Reception |
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