HD64F3048F16 Datasheet, PDF (533/903 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 13 Serial Communication Interface
3
Error handling
Overrun error handling
Clear ORER flag to 0 in SSR
End
Figure 13.18 Sample Flowchart for Serial Receiving (2)
In receiving, the SCI operates as follows.
1. The SCI synchronizes with serial clock input or output and initializes internally.
2. 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.
3. 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).
Figure 13.19 shows an example of SCI receive operation.
Rev. 3.00 Sep 27, 2006 page 505 of 872
REJ09B0325-0300