Peter wrote: > In older (TTL) times such a small RC delay would have been > accomplished using a small RC integrator, Your statement makes no sense out of context. Trimming large chunks of wha= t you are replying to is good, but it's also important to leave some context. This of course is all obvious and well known, duh. > To work around glitches and runtime problems I'd try to > implement the XOR using the gates in a single 74HC00 package. > Simulation may help here... usually implemented XOR gates are > glitch-prone due to the different propagation times through the > negated and straight paths. In this case, that glitchiness can be put > to good use after stretching it a little with a RC delay element, I > think. Again, it's not clear what they heck you're talking about, but it sounds like a bad idea. Using a XOR gate as a edge-to-glitch converter is really = a kludge. Most likely there is a real solution available if you explain what problem you are trying to solve one or two levels up. ******************************************************************** Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products (978) 742-9014. Gold level PIC consultants since 2000. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .