PM2_DAC_DATA
bus_space_write_1(sc->sc_memt, sc->sc_regh, PM2_DAC_DATA, r);
bus_space_write_1(sc->sc_memt, sc->sc_regh, PM2_DAC_DATA, g);
bus_space_write_1(sc->sc_memt, sc->sc_regh, PM2_DAC_DATA, b);