Re: [avr-chat] Error in Timing.

[Erik Christiansen]

On Sun, Feb 26, 2006 at 05:55:06PM +0530, Royce Pereira wrote:
> However, the Crystal oscillator also gives an error of about 5 seconds in 
> 300 seconds. I tried using different capacitor values at the crystals pins, 
> but this made no difference.

One way to check is to select the internal 1 MHz rate, confirm that
rate, then select external crystal, and confirm 4 MHz. Then we can be
more certain that RC 4 MHz is not still selected. Do you have a crystal
that is not 1/2/4/8 MHz, to absolutely confirm clock source selection?

If the crystal were in control, the oscillator should be within 100 ppm
(or even 50), not 16,700 ppm off. Are you using something vaguely like
12 to 22 pf capacitors?

hth,
Erik