IPS_REG_HIS
bus_space_write_1(sc->sc_iot, sc->sc_ioh, IPS_REG_HIS, IPS_REG_HIS_EN);
reg = bus_space_read_1(sc->sc_iot, sc->sc_ioh, IPS_REG_HIS);
bus_space_write_1(sc->sc_iot, sc->sc_ioh, IPS_REG_HIS, reg);