RTC on Timer Interrupts

[meena]

I am using TIMER 14 for counting test durations in my projects however I am lagging off aroumd 5 mins per week.How can i implement the same with RTC counter?

[Techn]

The accuracy depends on the crystal. If you really need very accurate timing, adjust the timer reload value or use external rtc such as ds3231 which can generate 1 sec pulse use it to.generate interrupt and do the counting.