RX610 Group
20. Serial Communications Interface (SCI)
R01UH0032EJ0120 Rev.1.20
Page 625 of 1006
Feb 20, 2013
PER Bit (Parity Error Flag)
Indicates that a parity error has occurred during reception in asynchronous mode and the reception ends abnormally.
[Setting condition]
•
When a parity error is detected during reception
Although receive data when the parity error occurs is transferred to RDR, no RXI interrupt request occurs. Note that
when the PER flag is being set to 1, the subsequent serial reception cannot be performed. In clock synchronous
mode, serial transmission also cannot continue.
[Clearing condition]
•
When a 0 is written to PER after reading PER = 1 (After writing a 0 to it, read the PER bit and check that it has
actually been cleared to 0.)
Even when the RE bit in SCR is cleared to 0 (which indicates that serial reception is disabled), the PER flag is not
affected and retains its previous value.
FER Bit (Framing Error Flag)
Indicates that a framing error has occurred during reception in asynchronous mode and the reception ends abnormally.
[Setting condition]
•
When the stop bit is 0
In 2-stop-bit mode, only the first stop bit is checked whether it is 1 but the second stop bit is not checked. Note that
although receive data when the framing error occurs is transferred to RDR, no RXI interrupt request occurs. In
addition, when the FER flag is being set to 1, the subsequent serial reception cannot be performed. In clock
synchronous mode, serial transmission also cannot continue.
[Clearing condition]
•
When a 0 is written to FER after reading FER = 1 (After writing a 0 to it, read the FER bit and check that it has
actually been cleared to 0.)
Even when the RE bit in SCR is cleared to 0, the FER flag is not affected and retains its previous value.
ORER Bit (Overrun Error Flag)
Indicates that an overrun error has occurred during reception and the reception ends abnormally.
[Setting condition]
•
When the next data is received before receive data is read from RDR
In RDR, receive data prior to an overrun error occurrence is retained, but data received after the overrun error
occurrence is lost. When the ORER flag is set to 1, subsequent serial reception cannot be performed. Note that, in
clock synchronous mode, serial transmission also cannot continue.
[Clearing condition]
•
When a 0 is written to ORER after reading ORER = 1 (After writing a 0 to it, read the ORER bit and check that it
has actually been cleared to 0.)
Even when the RE bit in SCR is cleared to 0, the ORER flag is not affected and retains its previous value.
Summary of Contents for RX600 Series
Page 1006: ...RX610 Group R01UH0032EJ0120 ...