![](http://datasheet.mmic.net.cn/100000/IF180C52TXXX-20R_datasheet_3493957/IF180C52TXXX-20R_401.png)
401
32099I–01/2012
AT32UC3L016/32/64
1: The Buffer Full signal from the Peripheral DMA Controller channel is active.
ITER/UNRE: Max number of Repetitions Reached or SPI Underrun Error
If USART does not operate in SPI Slave Mode:
ITER=0: Maximum number of repetitions has not been reached since the last RSTSTA.
ITER=1: Maximum number of repetitions has been reached since the last RSTSTA.
If USART operates in SPI Slave Mode:
UNRE=0: No SPI underrun error has occurred since the last RSTSTA.
UNRE=1: At least one SPI underrun error has occurred since the last RSTSTA.
TXEMPTY: Transmitter Empty
0: The transmitter is either disabled or there are characters in THR, or in the transmit shift register.
1: There are no characters in neither THR, nor in the transmit shift register.
TIMEOUT: Receiver Time-out
0: There has not been a time-out since the last Start Time-out command (CR.STTTO), or RTOR.TO is zero.
1: There has been a time-out since the last Start Time-out command.
PARE: Parity Error
0: Either no parity error has been detected, or the parity bit is a zero in multidrop mode, since the last RSTSTA.
1: Either at least one parity error has been detected, or the parity bit is a one in multidrop mode, since the last RSTSTA.
FRAME: Framing Error
0: No stop bit has been found as low since the last RSTSTA.
1: At least one stop bit has been found as low since the last RSTSTA.
OVRE: Overrun Error
0: No overrun error has occurred since the last RSTSTA.
1: At least one overrun error has occurred since the last RSTSTA.
RXBRK: Break Received/End of Break
0: No Break received or End of Break detected since the last RSTSTA.
1: Break received or End of Break detected since the last RSTSTA.
TXRDY: Transmitter Ready
0: The transmitter is either disabled, or a character in THR is waiting to be transferred to the transmit shift register, or an
STTBRK command has been requested. As soon as the transmitter is enabled, TXRDY becomes one.
1: There is no character in the THR.
RXRDY: Receiver Ready
0: The receiver is either disabled, or no complete character has been received since the last read of RHR. If characters were
being received when the receiver was disabled, RXRDY changes to 1 when the receiver is enabled.
1: At least one complete character has been received and RHR has not yet been read.