That was the fix Cheers James > Subject: Re: [PIC] PIC looses it's program memory > > James, > Can you use a bleed resistor to fix it? > Funny N. > New Bedford, MA > http://www.AuElectronics.selfip.com > > > > ----- Original Message ---- > From: James Holland > To: piclist@mit.edu > Sent: Saturday, November 17, 2007 1:17:49 PM > Subject: RE: [PIC] PIC looses it's program memory > > > Date: Fri, 16 Nov 2007 10:06:43 -0800 > > From: "Andre Abelian" > > > > Hi to all, > > > > 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? > > > > thanks > > > > Andre > > > > I've seen this happen a couple of times. In all cases there was a definite > problem with the hardware or software. I just can't remember what exactly > caused it (late night debugging sessions!) IIRC it was an input set to an > output or some issue with the power supply. > Holding up the supply with a cap can cause its own problems. I tried a > similar circuit on a 12F683, if the circuit was switched on and off > relatively quickly then the voltage could decay to a point between the > minimum working voltage (loss of RAM) and the POR voltage, at which point > Brown Out Reset is not guaranteed to work. In my case it certainly didn't! > Its surprising how long a 12F683 can run from a fully charged 68uF cap. > Cheers > James -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist