HD6413008VF25 Datasheet, PDF (385/688 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

12. Serial Communication Interface
Bit 5—Overrun Error (ORER): Indicates that data reception ended abnormally due to an
overrun error.
Bit 5
ORER
Description
0
Receiving is in progress or has ended normally*¹
(Initial value)
[Clearing conditions]
• The chip is reset or enters standby mode
• Read ORER when ORER = 1, then write 0 in ORER
1
A receive overrun error occurred*²
[Setting condition]
Reception of the next serial data ends when RDRF = 1
Notes: 1. Clearing the RE bit to 0 in SCR does not affect the ORER flag, which retains its
previous value.
2. RDR continues to hold the receive data prior to the overrun error, so subsequent
receive data is lost. Serial receiving cannot continue while the ORER flag is set to 1. In
synchronous mode, serial transmitting is also disabled.
Bit 4—Framing Error (FER)/Error Signal Status (ERS): The function of this bit differs for the
normal serial communication interface and for the smart card interface. Its function is switched
with the SMIF bit in SCMR.
For serial communication interface (SMIF bit in SCMR cleared to 0): Indicates that data
reception ended abnormally due to a framing error in asynchronous mode.
Bit 4
FER
Description
0
Receiving is in progress or has ended normally*¹
(Initial value)
[Clearing conditions]
• The chip is reset or enters standby mode
• Read FER when FER = 1, then write 0 in FER
1
A receive framing error occurred
[Setting condition]
The stop bit at the end of the receive data is checked for a value of 1, and is
found to be 0.*²
Notes: 1. Clearing the RE bit to 0 in SCR does not affect the FER flag, which retains its previous
value.
2. When the stop bit length is 2 bits, only the first bit is checked for a value of 1. The
second stop bit is not checked. When a framing error occurs the SCI transfers the
receive data into RDR but does not set the RDRF flag. Serial receiving cannot continue
while the FER flag is set to 1. In synchronous mode, serial transmitting is also disabled.
Rev.4.00 Aug. 20, 2007 Page 339 of 638
REJ09B0395-0400