[Coco] PICs and S-Video

jdaggett at gate.net jdaggett at gate.net
Wed Feb 22 08:14:04 EST 2006


In programable logic, the technique to create delays is a fast clock 
and a shift register. For delaying the HSYNC one can delay so 
many pixel clock periods. This may add complexity to your circuit 
with another oscillator and a shift register. 

There are still other  methods that include LC networks and delay 
lines to get upwards to 100nS delay.

On 21 Feb 2006 at 21:37, Chris Hawks wrote:

> Well, the S-Video converter works well and is centered enough on the LCD
> TV, but off a little to the left on the Big TV, because of the late HSYNC.
>     I'm working on delaying it (by almost a whole line), but, the TTL is
> getting pretty complicated. It was suggested that I use a small PIC, but,
> I've never used them before and don't have a programmer. Seems pretty
> brain-dead. One input, one output and a comaparator/analog input. Take an
> interupt on HSYNC, start a countdown timer (value based on the pot
> connected to the comparator/analog input), take an interrupt on time-out
> and output the HSYNC pulse then. 
> Suggestions, input, offers to help???
> Christopher R. Hawks
> HAWKSoft
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