>
> Well It doesn't really matter wether I have an external chip or not as long
> as I can get a reasonably accurate time and date etc.

I'm in the process of running TMR1 32768 Hz tests right now for a
sunrise/sunset clock I'm building. Since the timing resolution wasn't
real important I set TMR1 for the max 16 second timeout and added 16
seconds to the time every timeout. But without too much work you can get
the timeout down to 2 seconds and with a bit of code you can actually
update every second.

I've run a couple of 12 hour tests and they've kept time to within 1 second.
Once I get my display and button interface added I plan to run a week or
two test.

Also I've suceeded in getting a Nicad battery interface working. A 9V high
capacity Nicad from the RatShack kept the board running for 8 hours. I figure
that'll outlast most any power outage.

After fiddling with it, I'd highly recommend using the 32768 Hz crystal on
TMR1.

BAJ
>
> -----Original Message-----
> From: Vasile Surducan [mailto:vasile@L30.ITIM-CJ.RO]
> Sent: Thursday, 15 February 2001 10:52 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [PIC]: Real Time Clock
>
>
> Why do you want to connect a RTC to a chip who already have tmr1 who works
> ok with external 32768 crystal ?
> Vasile
>
> On Fri, 16 Feb 2001, Peter May wrote:
>
> > What is the easiest and where can I find examples of hooking up a RTC chip
> > to a 16F877? I have a couple of Dallas 1302's. Are there any others I
> should
> > consider?
> >
> > --
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> > mailto:piclist-unsubscribe-request@mitvma.mit.edu
> >
> >
>
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