AVR-Chat

On Mon, Jun 20, 2005 at 04:38:09PM -0000, jeff_smith_8992 wrote:
> 
> When I use the AVR's internal oscillator or an external crystal
> oscillator, like 1.0 MHz, is the frequency 1,000,000 Hz (give or take
> a few Hz for accuracy, temp, etc)?  And not a power of 2, like 2 to
> the 20th = 1,048,576?

Yes, both. If you purchase a 1,000,000 Hz crystal or oscillator it will
not be a power of two. But you could choose 1,048,576 if that suited the
application better.

On top of that crystals are graded for accuracy on a "ppm" scale. Parts
Per Million. Common cheap crystals are 80 ppm. 10 ppm is getting
expensive. 2 ppm is getting into the range of an oscillator with built
in oven. In general crystal accuracy and stability is more important
to radio applications than to microprocessors.

-- 
David Kelly N4HHE, dkelly@HiWAAY.net
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Whom computers would destroy, they must first drive mad.