kris duff wrote: > The question was more do somebody has already see this kind of weird > thing in the microchip datasheet... It's not clear what exactly "think kind of weird thing" is. You first aske= d about how to filter on only a subset of the ID. That is done with "masks". You set up masks to indicate which bits of the ID a possible set of filters applies to. They is precisely what they are for. However I don't understand what the datasheet confusion is nor how that relates to filtering on a subset of the ID bits. Also, it would help to take a little more care in writing your question. I normally don't bother to go into this, but Russell seems to want me to explain my thought process in detail. Since all we know about you is what you write here, we can only judge you by that writing. How you are perceived has a lot to do with the quality of the answers you will get. At least for me, the more I judge someone to be a clueless moron, the less I'm inclined to spend time trying to help. Your sentence above unfortunately doesn't speak well about you. "do somebody has already see" should be "has somebody already seen". The meaning is still clear enough in this case, but this sort of poorly written english is annoying to read. It basically says "I'm so imporant and you're so inconsequential that I don't give a crap how easy it is to read my post. Sure, I could spend 200 more milliseconds and a few extra brain cycles to get it right, but you're not worth it, peon". Like it or not, you are constantly judged by what you write and the quality of that writing. That'= s not meant as a offense, simply a statement of how the world works, whether the world tells you this or not. I understand this may not be your fault since you may not be a native english speaker. Note that this doesn't change the annoyance level in reading your post, but would give you considerable slack if it were known t= o be true. "Sorry, I'm doing the best I can" is quite forgivable and very different from "I don't give a crap". However to get this slack, it has to be known you really are a non-native english speaker, not just a lazy ingrate. Sometimes that's clear from other grammar, choice of words, and spellings in the rest of the post. In this case it's not. Having a foreig= n sounding name helps. I understand names are little guarantee of anything, but in the abscence of other information do tip the scales. Unfortunately "kris duff" is no help. If anything, it makes it more likely you should know english well. The fact that K and D aren't capitalized as they should be is another strike against you. If you really are foreign to english and a beginner, it helps immensely to say so. Your sentence above would be no issue at all if I knew you were foreign to english. All this is just to point out the internal thought process that goes into deciding how to judge how much effort to spend in replying to a post. This goes on all the time. The only difference is that this one time I describe= d the process in detail so you can understand how you are preceived (since I expect you wish to receive good replies) and to get Russell off my back. Yes, this is rather harsh. However that's the way the world works. The only difference is that I'm describing the process instead of applying it silently. Don't shoot the messenger (that goes for you too, Russell). ******************************************************************** 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 .