RISR

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Interpret as RISR

Raw interrupt status

TXEIR	Transmit FIFO empty raw interrupt status
TXOIR	Transmit FIFO overflow raw interrupt status
RXUIR	Receive FIFO underflow raw interrupt status
RXOIR	Receive FIFO overflow raw interrupt status
RXFIR	Receive FIFO full raw interrupt status
MSTIR	Multi-master contention raw interrupt status

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