[SOLVED] rtc crystal oscillator

[jyothi1]

Hi 2 all,

why we are using external clock 32.786KHz for function of RTC?why won't we get 32.786KHZ frequency using control registers which is inbuilt?

Thanks in advance



regards
JYOTHI

 

[keith1200rs]

Because the accuracy will be rubbish for a built in microcontroller clock. Fine for non-critical timing, no good for a real clock.

Keith