You definitely don't need two PIC's!

I've done a 21 day timer for a battery charger using a PIC16C715 1k part
and the pic has hour timers and day timers.  And that's not all it does
either.

Just use your interrupt to get a regular timing interval and increment
the right timers at the right time.

> -----Original Message-----
> From: William Cornutt [SMTP:wcornutt@SLIP.NET]
> Sent: Tuesday, March 31, 1998 2:37 PM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: Need help with a 30 min. timer
>
> I was going to suggest using two PIC's.  One for min's, the other for
> sec's.
>
> Bill C.     wcornutt@slip.net
>
>
> ----------
> > This guy really knows how to take all the fun out of PICing  :)
> >
> > Calvin
> >
> > >
> > >    Do you REALLY need a microcontroller for this????? Why not
> using a 555
> > >astable and a BIG divider... The error would be much less then 5 %
> when
> > >correctly adjusted! Or even better use the 555 as a monostable with
> large
> > >timing! It doesn't even have to be programmed!
> > >
> >