RTC_SEC10
__raw_writeb(real_seconds / 10, RTC_SEC10);
sec = (__raw_readb(RTC_SEC1) & 0xf) + (__raw_readb(RTC_SEC10) & 0x7) * 10;
} while (sec != (__raw_readb(RTC_SEC1) & 0xf) + (__raw_readb(RTC_SEC10) & 0x7) * 10);
__raw_writeb(0, RTC_SEC1); __raw_writeb(0, RTC_SEC10);