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Initialization
Start reception
Read ORER flag in SSR
ORER = 1
No
Read RDRF flag in SSR
No
RDRF = 1
Yes
Read receive data in RDR and
clear RDRF flag in SSR to 0
No
All data received
Yes
Clear RE bit in SCR to 0
End reception
[3]
Error processing
Overrun error processing
Clear ORER flag in SSR to 0
<End>
Figure 14.19 Sample Serial Reception Flowchart
Section 14 Serial Communication Interface (SCI)
[1] SCI initialization:
[1]
The RxD pin is automatically
designated as the receive data input
pin.
[2] [3] Receive error processing:
If a receive error occurs, read the
[2]
ORER flag in SSR, and after
performing the appropriate error
Yes
processing, clear the ORER flag to 0.
[3]
Transfer cannot be resumed if the
ORER flag is set to 1.
Error processing
[4] SCI status check and receive data
(Continued below)
read:
Read SSR and check that the RDRF
[4]
flag is set to 1, then read the receive
data in RDR and clear the RDRF flag
to 0.
Transition of the RDRF flag from 0 to
1 can also be identified by an RXI
interrupt.
[5] Serial reception continuation
procedure:
To continue serial reception, before
the MSB (bit 7) of the current frame is
received, reading the RDRF flag,
reading RDR, and clearing the RDRF
[5]
flag to 0 should be finished.
Note:
[6]
Do not write to SMR, SCR, BRR,
and SDCR from the start to the
end of reception except the
process of [6].
Rev. 1.00 May 09, 2008 Page 405 of 954
REJ09B0462-0100
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