[time-nuts] Why these Crystal Frequencies?

Brooke Clarke brooke at pacific.net
Wed Dec 14 22:54:11 EST 2011


Hi Rex:

Thanks, I had 14.7456 mis listed (off one row) as the 4X CB freq.  I've updated the table.

Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/Brooke4Congress.html


Rex wrote:
> Brooke,
>
> 14.31818  is 4x the analog color burst (~3.58)
>
> 18.432   divides cleanly for baud rates. I've used it as a PIC clock for that. I think some of the others may be too, 
> but I didn't recognize or do the math to see.
>
>
> On 12/14/2011 7:13 PM, Brooke Clarke wrote:
>> Hi Pete:
>>
>> Maybe you can shed some light on the common xtal frequencies table where there's no explanation given?
>> http://www.prc68.com/I/pdf/Crystal_Freq.pdf
>> An answer is not it's an "even" frequency or "it's an even binary frequency. That's true for most of these and the 
>> factors are part of the table above.
>> The question is why do they exist?
>> such as:
>> 32.0 kHz
> ...
>
>
>
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