RTC_SEC
readrtc(RTC_SEC));
writertc(RTC_SEC, bin2bcd(tm%60)); tm /= 60; /* Write back Seconds */
rtcin(RTC_HRS), rtcin(RTC_MIN), rtcin(RTC_SEC),
sec = rtcin(RTC_SEC);
sec = rtcin(RTC_SEC);
sec = rtcin(RTC_SEC);