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Rev. 1.0, 07/01, page 207 of 372
Yes
No
Start reception
[1]
[4]
No
Yes
Read RDRF flag in SSR [2]
[3]
Clear RE bit in SCR3 to 0
Error processing
(Continued below)
Read receive data in RDR
Yes
No
OER = 1
RDRF = 1
All data received?
Read OER flag in SSR
Start overrun error processing
Overrun error processing
Clear OER flag in SSR to 0
[4]
[1] Read the OER flag in the serial status
register(SSR) to determine if there is an
error. If an overrun error has occurred,
execute overrun error processing.
[2] Read SSR and check that the RDRF flag is
set to 1, then read the receive data in RDR.
When data is read from RDR, the RDRF
flag is automatically cleared to 0.
[3] To continue serial reception, before the
MSB (bit 7) of the current frame is received,
read the RDRF flag, read RDR, then clear
the RDRF flag to 0. When data is read from
RDR, the RDRF flag is automatically
cleared to 0.
[4] If an overrun error occurs, read the OER
flag in SSR, and after performing the
appropriate error processing, clear the OER
flag to 0. Reception cannot be resumed if
the OER flag is set to 1.
End
End
Figure 14-13 Sample Serial Reception Flowchart (Clocked Synchronous Mode)