Thank you, David


> I'd be more concerned about what you're wanting to do with the data, and 
> how
> big the data is.

Yes, thats sure important for calculating the maximum counter duration.
The maximum length of a datastream is 23 x 8 = 184 bits, however there is in
every block of 8 bits at the beginning and/or end at least one zero (edge),
so the counter can comfortably count several miccroseconds over 104.

>
> Getting the data itself can't be that bad.  You'll need a timer that you 
> can
> set to interrupt you when you should go check the input line, and an edge
> triggered int to start the timer off when you see the start of the flag
> byte.

Now that was helpful in understanding that I really can have the timer
interrupt other code and the edge restart the timer.


>
> You're going to have a guaranteed maximum run time in any state, so you 
> need
> to assure that you don't drift significantly during that time.

Yes, right, but that seems to be no problem since I found to have an edge in
every block of 8 bits.

Thanks a lot. now I'm pretty confident that I can make it work (with a lot
of help from this friendly list :-) )

Lembit


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