Datasheet
353
AT32UC3A
– If USART operates in SPI Slave Mode (MODE = 0xF):
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: There are characters in either THR or the Transmit Shift Register, or the transmitter is disabled.
TXEMPTY == 1: Means that the Transmit Shift Register is empty and that there is no data in THR.
• TIMEOUT: Receiver Time-out
0: There has not been a time-out since the last Start Time-out command (STTTO in CR) or the Time-out Register is 0.
1: There has been a time-out since the last Start Time-out command (STTTO in CR).
• PARE: Parity Error
0: No parity error has been detected since the last RSTSTA.
1: At least one parity error has been detected since the last RSTSTA.
• FRAME: Framing Error
0: No stop bit has been detected low since the last RSTSTA.
1: At least one stop bit has been detected 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.
• ENDTX: End of Transmitter Transfer
0: The End of Transfer signal from the Transmit PDC channel is inactive.
1: The End of Transfer signal from the Transmit PDC channel is active.
• ENDRX: End of Receiver Transfer
0: The End of Transfer signal from the Receive PDC channel is inactive.
1: The End of Transfer signal from the Receive PDC channel is active.
• 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: A character is in the THR waiting to be transferred to the Transmit Shift Register, or an STTBRK command has been
requested, or the transmitter is disabled. As soon as the transmitter is enabled, TXRDY becomes 1.
1: There is no character in the THR.
• RXRDY: Receiver Ready
0: No complete character has been received since the last read of RHR or the receiver is disabled. If characters were being
received when the receiver was disabled, RXRDY changes to 1 when the receiver is enabled.
32058K
AVR32-01/12