>The PIC clock needs to synchronize to the incoming video, I was planning
>to do that by using software to compare the sync pulses with the state of
>the program, and output pulses to a varicap diode that adjusts the
>frequency of the PIC oscillator.  Anyone tried this before?  Just
>synchronizing the software will let the text jitter (maybe slowly, maybe
>quickly) one pixel or so back and forth.  Also a custom crystal would be
>required.  So I'd really like to synchronize the oscillator itself.

How about using a PLL to multiply the horizontal clock pulses by 64 or 128?
Then you can use the video timebase as the clock to the pic.


newell