Hi, Thanks for the reply.


> I read this thread, but I thing that using an external 40MHz clock
> won't have any difference in your problem. If you lock the 40MHz
> clock to your external source, then you don't known in which cicle
> the PIC is running.

When at 40Mhz it always locks into exactly the same point of the cycle. I am not 100% certain that this will be the correct cycle but from what I have seen using a 40Mhz oscillator module it should be. Or have I misuderstood what you are saying? Can you explain a little more?

You need to phase-lock the internal PIC cicle to your external clock.
> If I needed something as you describe, I'd try generating in the PIC
> a stable signal at hscan freq. (i.e. from an internal PIC timer) and
> using that to phase lock the main oscilator. It's simpler than it seems.
>

It has to be locked to the 15.625Khz Hsync coming from the camera (via sync separator) as this signal does vary and causes all sorts of picture wobble. I do generate hsync in the PIC exactly and have tried to feed this into the ext divide of the Genlock IC to stabilise, but the one I generate is too perfect when compared the camera sync and the differences between them are too great for my PLL to correct them (don't know how well i explanied that, hope it makes sense)

Cheers,
DAN

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