Olin, I'm going to ask that you reread my sequence of posts where I describe the two test boards as to why, in my opinion, in this case, the decoupling caps issue is irrelevant. They ARE on one board, and I didn't put them on the other just to have something to compare with quickly. And BOY am I sorry I didn't put them on, b/c it seems that most of PIClist can't consider anything except that as the issue, even though they are on the other test board. Just to put this, and particularly your frankly obnoxious attitude to rest, I will retest WITH DECOUPLING CAPS ON BOARD #2 TODAY and experiment a little further. I would like an explanation of why my credibility is so bad that you choose to frankly be directly insulting to me. I don't need to write simple code in a simulator first, as you suggested in another email. Seriously Olin, I have 30+ PIC designs in the last 6 years, and a number of non-pic designs in the field. This has never come up in any other design or with any other PIC model. I'm sorry that I'm not a beginner you can just off the cuff brush off as some dumbass arrogant newbie. It may well be something I'm doing. I will experiment a little more today. I'm willing to mea culpa if it is my fault. After this thread finally dies I will reconsider posting anything to PIClist since emails with the tone of the below make an already stressful situation (real world client work behind schedule) worse. Maybe I should just end the discussion now. Olin Lathrop wrote: > Jesse Lackey wrote: >> This has nothing to do with decoupling caps, DC power supply voltage or >> cleanliness thereof. > > Of course it does. The single most likely explanation is that the real > board also has some power supply glitches causing the brownout reset circuit > to do exactly what it's supposed to do. You say it has decoupling caps, but > considering your credibility I have no confidence that they are in the right > place, hooked up the right way, really connected, etc. Improper or failed > decouping cap connections would produce exactly the symptoms you are > reporting. > > > ******************************************************************** > Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products > (978) 742-9014. Gold level PIC consultants since 2000. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist