Xiaofan, Even though the "brown-our reset" is disabled in Hardware, Could it be possible to re-enable by software? Funny N. New Bedford, MA http://www.AuElectronics.selfip.com ----- Original Message ---- From: Xiaofan Chen To: Microcontroller discussion list - Public. Sent: Saturday, November 17, 2007 6:37:55 PM Subject: Re: [PIC] PIC looses it's program memory On Nov 17, 2007 2:54 AM, wouter van ooijen wrote: > > I use pic18f4550 and I noticed that the pic looses it's > > program memory I am not sure how many % but it is enough to > > see things are not working and this is my 3rd time I started > > doing hardware trouble shooting and I ended up reprogramming > > pic fixed the problem. The only possibility is the part got > > over heated while soldering. any idea? > > Got the same problem, with 18F2550's (a pickit2 clone circuit). My > current guess is that I have open inputs. I will add a few more > resistors to the next batch, but that is due only 2008Q2. > More likely it is due to the power supply and the fact that brown-our reset is disabled in PICkit 2 firmware (Walter mentioned it is because Brown out reset interferes with some normal operations). It may also have something to do with bootloader. IMHO other vendors like Silabs (C8051F) and Atmel (AVR) have more problems. Example: http://www.cygnal.org/ubb/Forum1/HTML/002399.html Xiaofan -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist ____________________________________________________________________________________ Be a better pen pal. Text or chat with friends inside Yahoo! Mail. See how. http://overview.mail.yahoo.com/ -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist