Atmel AT32UC3A3128, Manual

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32072H–AVR32–10/2012
AT32UC3A3
31.7.12 Status Register
Name: SR
Access Type: Read-only
Offset: 0x040
Reset Value: 0x0C000025
• ACKRCVE: Boot Operation Acknowledge Error
This bit is set when a corrupted Boot Acknowlegde signal has been received.
This bit is cleared by reading the SR register.
• ACKRCV: Boot Operation Acknowledge Received
This bit is set when a Boot acknowledge signal has been received.
This bit is cleared by reading the SR register.
• UNRE: Underrun Error
This bit is set when at least one eight-bit data has been sent without valid information (not written).
This bit is cleared when sending a new data transfer command if the Flow Error bit reset control mode in Configuration Register
(CFG.FERRCTRL) is zero or when reading the SR register if CFG.FERRCTRL is one.
• OVRE: Overrun Error
This bit is set when at least one 8-bit received data has been lost (not read).
This bit is cleared when sending a new data transfer command if CFG.FERRCTRL is zero, or when reading the SR register if
CFG.FERRCTRL is one.
• XFRDONE: Transfer Done
This bit is set when the CR register is ready to operate and the data bus is in the idle state.
This bit is cleared when a transfer is in progress.
• FIFOEMPTY: FIFO empty
This bit is set when the FIFO is empty.
This bit is cleared when the FIFO contains at least one byte.
• DMADONE: DMA Transfer done
This bit is set when the DMA buffer transfer is completed.
This bit is cleared when reading the SR register.
• BLKOVRE: DMA Block Overrun Error
This bit is set when a new block of data is received and the DMA controller has not started to move the current pending block.
This bit is cleared when reading the SR register.
31 30 29 28 27 26 25 24
UNRE OVRE ACKRCVE ACKRCV XFRDONE FIFOEMPTY DMADONE BLKOVRE
23 22 21 20 19 18 17 16
CSTOE DTOE DCRCE RTOE RENDE RCRCE RDIRE RINDE
15 14 13 12 11 10 9 8
TXBUFE RXBUFF CSRCV SDIOWAIT - - SDIOIRQB SDIOIRQA
7 6 5 4 3 2 1 0
ENDTX ENDRX NOTBUSY DTIP BLKE TXRDY RXRDY CMDRDY