WPI_MASK
WPI_WRITE(sc, WPI_MASK, 0);
WPI_WRITE(sc, WPI_MASK, WPI_INT_MASK);
WPI_WRITE(sc, WPI_MASK, WPI_INT_MASK);
WPI_WRITE(sc, WPI_MASK, WPI_INT_MASK);
WPI_WRITE(sc, WPI_MASK, 0);