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Bit 5 Overrun Error (ORER): Indicates that an overrun error occurred during reception,
causing abnormal termination.
Bit 5
ORER
Description
0
[Clearing conditions]
When 0 is written in ORER after reading ORER = 1
1
[Setting conditions]
When the next serial reception is completed while RDRF = 1
Notes: 1. The ORER flag is not affected and retains its previous state when the RE bit in SCR1 is
cleared to 0.
2. The receive data prior to the overrun error is retained in RDR1, and the data received
subsequently is lost. Also, subsequent serial reception cannot be continued while the
ORER flag is set to 1. In synchronous mode, serial transmission cannot be continued,
either.
Bit 4 Framing Error (FER): Indicates that a framing error occurred during reception in
asynchronous mode, causing abnormal termination.
Bit 4
FER
Description
0
[Clearing conditions]
When 0 is written in FER after reading FER = 1
1
[Setting conditions]
When the SCI checks the stop bit at the end of the receive data when reception ends,
and the stop bit is 0
Notes: 1. The FER flag is not affected and retains its previous state when the RE bit in SCR1 is
cleared to 0.
2. In 2-stop-bit mode, only the first stop bit is checked for a value of 1; the second stop bit
is not checked. If a framing error occurs, the receive data is transferred to RDR1 but
the RDRF flag is not set. Also, subsequent serial reception cannot be continued while
the FER flag is set to 1. In synchronous mode, serial transmission cannot be
continued, either.
*2
*1
*2
*1
Rev. 1.0, 02/00, page 411 of 1141
*1
(Initial value)
*1
(Initial value)
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