Renesas RX100 Series User Manual page 600

RX13T Group
PER Flag (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 receive data is not transferred to RDR.
[Clearing condition]
 When 0 is written to PER after reading PER = 1
When setting the PER flag to 0 to complete the interrupt handling, refer to section 14.4.1.2, Operation of Status
Flags for Level-Detected Interrupts .
Even when the SCR.RE bit is set to 0 (serial reception is disabled), the PER flag is not affected and retains its
previous value.
FER Flag (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 receive data is not transferred to RDR.
[Clearing condition]
 When 0 is written to FER after reading FER = 1
When setting the FER flag to 0 to complete the interrupt handling, refer to section 14.4.1.2, Operation of Status
Flags for Level-Detected Interrupts .
Even when the SCR.RE bit is set to 0, the FER flag is not affected and retains its previous value.
ORER Flag (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 0 is written to ORER after reading ORER = 1
When setting the ORER flag to 0 to complete the interrupt handling, refer to section 14.4.1.2, Operation of
Status Flags for Level-Detected Interrupts .
Even when the SCR.RE bit is set to 0, the ORER flag is not affected and retains its previous value.
RDRF Flag (Receive Data Full Flag)
Indicates whether the RDR register has received data.
[Setting condition]
 When data has been received normally, and transferred from RSR to RDR
[Clearing condition]
 When data is read from RDR
R01UH0822EJ0100 Rev.1.00
Jul 31, 2019
23. Serial Communications Interface (SCIg, SCIh)
Page 600 of 1041