> I tried searching the archives for this one, but every listing
> concentrated around a 32.768kHz oscillator source.

I'm surprised at that. 1 second timer is a perennial subject and
has a pretty good and regular thrashing. Were you looking in
the resources or the mail archives ?

> Anyways, my PIC application will require an accurate 1 second
> internal counter for timing, but does require a system clock speed
> of 4-20Mhz.

Just choose a xtal that's hex (particularly a multiple of 1024) rather
than decimal, eg 4.096 not 4.000 or 10.240 not 10.000, 18.432 or
19.6608 rather than 20.000

Use timer rollover IRQs to increment RAM counters. For example, a
4.9152 xtal will generate (4915200 / 4 / 256) = 4800 TMR0 IRQs per
second (or fewer if the pre-scaler is used), and no worries about
fudging, jitter, reloading......  All you need to consider is the ppm
accuracy of the xtal, and maybe add a trimmer to fine-tune the
frequency

> As far as I can tell, we haven't seen Roman here for a while. I have
> a few more questions about the Black regulator for him.

> Wherever he is, I wish him well.

> Lyle

I talked to him a little while ago. Apparently he's off researching a
book about people's favourite boy bands

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu