--------
In message <[email protected]>, Said Jackson writes:

>Then at some point the crystal 'snaps'  and jumps in frequency, overshooting
>the desired frequency and causing the P term to start pushing in the opposite
>direction repeating the cycle.

If your hardware does not respond to the output, any PI(D) loop will go
bezerk, and there's nothing you can do about it.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
[email protected]         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.
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