Many times the 32KHz oscillator is just used for ultra-low power rudimentary CPU timing, not so much for a "time of day" clock. The crystal gives more reliable timing than an RC delay, and the low power works fine for a "press to wake up" type application.
Bob LaJeunesse >________________________________ > From: Russ Ramirez <[email protected]> >To: [email protected] >Sent: Monday, November 11, 2013 8:06 PM >Subject: Re: [time-nuts] Maxim DS1342 > > >Hi Didier, > >...Looking across the TI and Microchip lines a bit, it strikes me as odd that >more micros supporting integrated RTCs actually use two I/Os for a 32 kHz >crystal option. Why they support an RTC is not mysterious at all, but why >not the option at to drive the 1 Hz clock directly rather than dividing 32 >kHz down to 1 Hz and using an extra I/O is odd when these I/Os are usually >configurable anyway. > >Russ > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
