Hi,

I know I now have a 31.768KHz clock connected to timer1.  I am trying
to set this to be the system clock.  Do I need to adjust OSCCON at
all?  Also will just setting up T1CON correctly do this, or are there
other settings that need to be changed?

On 5/8/05, Jinx <joecolquitt@clear.net.nz> wrote:
> > > datasheet for the 16F87, and it says the internal oscillator is
> > > +- 1% accurate, I think, at 25 degrees C.  I think something
> > > must be very wrong for it go get that far out.
> >
> > Do the calculation - half a second in 2 minutes is 0.4%, well in
> > spec. You'll need to use a crystal to keep accurate time
> 
> Or use OSCTUNE or adjust your timing block to compensate
> for the 0.4%. Depends on what periods you want to time. Even
> a crystal will not give give accurate long-term stability unless it's
> calibrated and temperature-compensated. 10ppm is ~ 1s / day
> 
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