James,
     Less than 1 percent would be worst case. If 1ppm could be achieved=20
that would be great but I don't know if that is possible. I'm not going=20
to use it for calibration work.
Thanks,
rich!

On 7/18/2014 3:40 AM, James Cameron wrote:
> On Fri, Jul 18, 2014 at 06:38:42PM +1000, James Cameron wrote:
>> Exactly.  What you haven't yet said is how accurate you want the pulse
>> to be, and what else the microcontroller is going to be doing.
> Oh, hang on, you said less than 1ppm.
>
> What's your crystal spec?
>

--=20
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