Verify the chip and see if there is a common theme. 

You can disable flash writing in the config fuses - try that and see if the
problem still happens, if not then your program is almost certainly writing
to the flash by accident. This is very hard to do accidentally so you may
have made a mistake in writing to data EEPROM.


Robin Abbott
Forest Electronics - Home of WIZ-C ANSI C Compiler for PIC's with RAD Front
end
robin.abbott@fored.co.uk
www.fored.co.uk 
 

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of
Andre Abelian
Sent: 16 November 2007 18:07
To: Microcontroller discussion list - Public.
Subject: [PIC] PIC looses it's program memory

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  

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