I was going to suggest using two PIC's.  One for min's, the other for sec's.

Bill C.     wcornutt@slip.net


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> 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!
> >
>