I have done exactly this, but in C, not assembler.  I did use some inline
asm code in the ISR for better control of the timing.  I don't think I can
share the source code with you since I did the job for someone else, but I
could possibly help you do something similar if you want.

In application I use a 16F84 to control the servo and do some sonar
ranging and serial communication, all of which uses a little under 50% of
the available program space.

Dale

On Thu, 8 Feb 2001, Robert Shady wrote:

> I'm working on a project (currently using the
> PIC16F84) in which I would like to be able to set the
> servo (1-8) to a specific setting (1=Extreme
> left/128=center/255=extreme right -- or whatever)
> somewhere in the main loop, and have an interrupt take
> care of actually maintaining that setting in the
> background.  I'm writing this is MPASM/GPASM for speed
> & compatibility.
>
> I've looked at a number of servo control source, and I
> haven't found anybody else doing it this way (it
> appears everyone dedicates a 16f84 to this task).  I
> figure this would have to be table driven, but just
> can't get this to work.  The timing is something else
> I'm having trouble getting just right.  Both chips are
> clock externally w/a 20mhz crystal.
>
> I can't believe I am the only person that has ever
> wanted to do this, does anybody out there have any
> examples I can look at that perhaps I've missed?
>
> I'm not new to programming (just new to PIC's), and
> it's killing me that I can't figure this out.  I've
> been working it for days now... I can send the code I
> have currently if anybody is interested..
>
> -- Rob
>
>
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