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Rev. 1.0, 07/01, page 201 of 372
Yes
No
Start reception
[1]
No
Yes
Read receive data in SSR
[3]
Clear RE bit in SCR3 to 0
Read OER, PER, and
FER flags in SSR
Error processing
[4]
Read receive data in RDR
Yes
No
OER+PER+FER = 1
RDRF = 1
All data received?
[1] Read the OER, PER, and FER flags in
SSR to identify the error. If a receive
error occurs, performs the appropriate
error processing.
[2] Read SSR and check that RDRF = 1,
then read the receive data in RDR and
clear the RDRF flag to 0. The RDRF
flag is cleared automatically.
[3] To continue serial reception, before the
stop bit for the current frame is
received, read the RDRF flag, read
RDR, and clear the RDRF flag to 0.
The RDRF flag is cleared automatically.
[4] If a receive error occurs, read the OER,
PER, and FER flags in SSR to identify
the error. After performing the
appropriate error processing, ensure
that the OER, PER, and FER flags are
all cleared to 0. Reception cannot be
resumed if any of these flags are set to
1. In the case of a framing error, a
break can be detected by reading the
value of the input port corresponding to
the RxD pin.
(A)
(Continued on next page)
[2]
End
Figure 14-8 Sample Serial Reception Data Flowchart (Asynchronous mode)(1)