RTC_SEC
RTC_PRINT(RTC_SEC);
dt->dt_sec = bcdtobin(rtc_read(RTC_SEC) & 0x7f);
rtc_write(RTC_SEC, bintobcd(dt->dt_sec));
s = rtc_read(RTC_SEC);
dt->dt_sec = RTC_REG(RTC_SEC10) * 10 + RTC_REG(RTC_SEC);
RTC_WRITE(RTC_SEC, sec2);