[time-nuts] 32768 Hz from 10 MHz

Brooke Clarke brooke at pacific.net
Thu Feb 2 18:34:42 UTC 2012


Hi Roberto:

By changing the timer count dynamically it's possible to lower the jitter to one timer count.  See:
http://www.prc68.com/I/PClock.shtml#BA

Have Fun,

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


Roberto Barrios wrote:
> Hi Tom,
>
> I'm interested in that divider. Actually, insterested in knowing how it works, not in the .HEX file.
>
> Breseham's algorith works but has inherent jitter and I've found no other solutions for situations like that.
>
> I'd live to know how it is done.
>
> Thank you,
> Roberto EB4EQA
> http://www.rbarrios.com
>
>
> -----Mensaje original----- From: Tom Van Baak
> Sent: Thursday, February 02, 2012 10:34 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] ANFSCD - Synchronizing time in home video recorders
>
>> I think I've seen comments about making 32 KHz from 10 MHz in a PIC or AVR.
>>
>> tvb has this web page, but I don't see a 32 KHz option:
>>  http://www.leapsecond.com/pic/picdiv.htm
>
> Hal,
>
> Yes, I have a PIC divider that takes 5 or 10 MHz input and
> outputs a 32.768 kHz square wave with minimal jitter and
> no long-term phase offset. Contact me off-line if interested.
>
> /tvb
>
>
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