RTC_DATA
return (bus_space_read_1(sc->sc_bt, sc->sc_bh, RTC_DATA));
bus_space_write_1(sc->sc_bt, sc->sc_bh, RTC_DATA, datum);
return (bus_space_read_1(sc->sc_bst, sc->sc_bsh, RTC_DATA));
bus_space_write_1(sc->sc_bst, sc->sc_bsh, RTC_DATA, val);