From: muratlanne@gmail.com   
      
   "Curbie"  wrote in message   
   news:io9ei757hpr2m3boi2sg06pn939rr0p45q@4ax.com...   
   > Jim.   
   >   
   > I just do it in software, also illustrates the use of a timing   
   > variable.   
   >   
   > Curbie   
   >   
   > buttonState = newbuttonState;   
   > [20mS timer expires]   
   > newbuttonState = readButtons();   
   > if (newbuttonState == buttonState) {   
   > }   
      
   Thanks, that's nice and logical. I suppose if I had to use 55mS PC system   
   clock ticks for the delay I would have to check that TIMER had incremented   
   twice to guarantee that I didn't sample the buttons just before and just   
   after a ~20uS tick interrupt.   
      
   jsw   
      
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