471
Table 13-11 Receive Errors and Conditions for Occurrence
Receive Error
Abbreviation
Occurrence Condition
Data Transfer
Overrun error
ORER
When the next data reception is
completed while the RDRF flag
in SSR is set to 1
Receive data is not
transferred from RSR to
RDR.
Framing error
FER
When the stop bit is 0
Receive data is transferred
from RSR to RDR.
Parity error
PER
When the received data differs
from the parity (even or odd) set
in SMR
Receive data is transferred
from RSR to RDR.
Figure 13-8 shows an example of the operation for reception in asynchronous mode.
RDRF
FER
0
1 frame
D0
D1
D7
0/1
1
0
D0
D1
D7
0/1
0
1
1
Data
Start
bit
Parity
bit
Stop
bit
Start
bit
Data
Parity
bit
Stop
bit
RXI interrupt
request
generated
ERI interrupt request
generated by framing
error
Idle state
(mark state)
RDR data read and RDRF
flag cleared to 0 in RXI
interrupt service routine
Figure 13-8 Example of SCI Operation in Reception
(Example with 8-Bit Data, Parity, One Stop Bit)
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