> What is the (max) freq from the sensor ?

Guessing around 1KHz.

> How is that detected ? Are you looking for a "missing interrupt" ?
> How do you "look" for that ?

Counting the time between the last two pulses.  If the pulse doesn't
occur within a time period +- some fudge factor to account for
acceleration/deacceleration, then the wheel is at the index point.

> What is the TMR0 intervall ?

It will overflow approximately 1-100mS.  

> What (max) freq from that device ?

Again, guessing around 1KHz.

> This is a quite simple interrupt, right ?

In itself, yes.  Having several interrupts occurring continually and
at the same time is what I'm trying to handle.

> Just incrementing some counter, I guess.

Yes, counting pulses for a given time period, then averaging the last
X time periods.
 
> Still, using the RX interrupt seems easier. What baud rate, b.t.w ?

I would think so also.  9600 baud would be fine.  Faster the better.

Regards,
Bob
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