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Yes you can.
It depends on several things
1-The operation clock of your micro (as gose higher you get more precisson)
2-Timer interrupt features ()
3-Interrupt latency(As it gose lower you get more accuracy)
4-Prescaler (hold some effort of the SW)
Yes it is feasible u can build a accurate clock.
U need a 32 bit processor which can store the data words and u need to program your SW in such a way that the interrupts will not suspend the operation.
in case of sw hanging (the micro controller hangs for a while), how can overcome the difference between the sw time and the real clock(without reloading the current time).
Hi, On most PIC's you can use Timer 1 in oscillator mode with a 32 KHz Crystal this is what you should do. When you get an timer 1 overflow give an interrupt and serve this. Also use BOR and WDT to make sure you do not get hangup's in infinite loops. Check the PIC18F8722 (39646b.pdf) datasheet Example 13-1 for code that make Timer 1 an Real-Time Clock.
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