BCR
bus_space_write_1(sc->sc_iot, sc->sc_ioh, BCR,
bus_space_write_1(sc->sc_iot, sc->sc_ioh, BCR,
bus_space_write_1(sc->sc_iot, sc->sc_ioh, BCR, 0);
bus_space_write_1(sc->sc_iot, sc->sc_ioh, BCR, BCR_INT_ENABLE);