Ramana wrote:
....
>So the point is why don't you use the timer in PIC to maintain a real
>time clock. Is there anything I am mising
>rgds
>ramana
>

The PIC internal timer makes a fine RTC, if the xtal frequency is
chosen correctly [some power of 2], and as long as updating the clock
and data acquisition don't louse up each other's timing.

Absolute accuracy is always a problem, as even a +/-50 PPM xtal
translates into ~4 sec error per day.

Also, you might check out the 2nd gen PICs, like 16C73/74. They
have a 2nd internal oscillator wired to pins C0 & C1, which can
be used with a 32 Khz watch xtal, even while the main oscillator
runs at 20 Mhz [whatever]. However, I have never heard tell of
anyone actually using it. Guys????

- Dan Michaels
Oricom Technologies
http://www.sni.net/~oricom
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