TCLK_H_REG_W
if (TCLK_H_REG_W != RTC_NO_REG_W) {
bus_space_write_2(sc->sc_iot, sc->sc_ioh, TCLK_H_REG_W, 0);
if (TCLK_H_REG_W != RTC_NO_REG_W) {
timeh = bus_space_read_2(sc->sc_iot, sc->sc_ioh, TCLK_H_REG_W);