Take a look also at

http://www.efd.lth.se/~e96rg/mc/video/rtvideo.html

and

http://www.efd.lth.se/~e96rg/mc/mc.html

Tal

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Joe Farr
> Sent: Sunday, June 02, 2002 1:40 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [PIC]:Having problem with pic clock
>
>
> I have seen TV games like ping pong and others that run on a
> 16F84 pic and were very stable.
> The main problem is seems to be getting the timing of the
> software exactly right.
> If you have a look at http://www.ubasics.com/adam/pic/archive.shtml
> There's a video clock and the pong game.
>
> Might provide you some clues....
>
>
> -----Original Message-----
> From: zahid [mailto:zahid@STGLABS.8M.COM]
> Sent: 30 May 2002 13:14
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [PIC]:Having problem with pic clock
>
>
> Hi all,
>
> I am using PIC microcontroller (4 MHz crystal) and LM1881 to add a white
> box to
> composite video at a specific location on TV. The problem i am having
> is that the box is not stable and moves on TV horizontally.
> Have tried
>
> 1)changing microcontroller clock from 4MHz to 20MHz.
> 2)EL 4583 sync seperator.
> 3)filtering the horizontal sync.
>
> but have not got any success.
> any suggestions ?
>
> one of my friends suggested to  Phase locked loop clock with horizontal
> sync as pic clock is not stable. But how.
>
> Regards
> Zahid
>
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