Content-Type: TEXT/PLAIN; CHARSET=US-ASCII Content-ID: hi there, Yesterday my worst nightmare occured, I think I may have inadvertently programmed the code protection bit on my PIC16C74JW. I'm not sure exactly how this happened. I have been using a home made programmer very succesfully up until now, but this time something strange happened the pic blankchecked ok programmed ok and then failed the verify.. At first I wasn't too worried but then I read back the code with a different package and this told me that the code protect bit had been set. Needless to say I was pretty disturbed that my 40 IRpounds chip had been effectively ruined. What I would like to find out from the list is 1. Is there anyway of undoing the code protect ?? (I assume not !) 2. If I cant undo the code protect is there any way I can reprogram the chip, even if I can't verify the code I write ? 3. If I buy a new chip what are the chances of me doing this again. 4. Am I correct in assuming that it only takes a one bit error when reprogramming the PIC to actually wreck your PIC. 5. Where are the fuses stored in memory are they part of the hex code you read back or is there a special bus instruction to access the fuses area of the pics. Is there any way I can be sure If I get another PIC that I don't do this again. Even if there is a hardware error in my programming. What I mean is for example If the download method is as follows 1. Send start signal 2. Download bit stream of CODE to PIC 3. Follow directly with bit stream of FUSES 010010.. etc 4. END If the above assumption is correct then I would be worried that a single bit error in the fuses stream could destroy my second PIC. However if on the other hand it follows the pattern of 1. Send Start Signal 2. Download bit stream of CODE to PIC 3. Send "Prepare to recieve FUSES code" (If fuses are to be set) 4. Now send Fuses bit stream. 5. END With the latter arrangement It could be possible to only program the code area and never send the "Prepare to recieve FUSES". This way I could be quite sure not to accidently set a CP FUSE. Assuming my spurious error doesn't send the correct byte to prepare for fuses.. (Fairly safe.) However I just realised I probably need to set my crystal fuse.. Aghhh is there any way to be safe.. One bit really isn't a big error for the price of the chip.. Anyway sorry for such a long posting. Any help or comments appreciated.. Thanks. David. P.S. I've included my original hex and readback code in case anyone can magically look at such cryptic figures and go " Ahh I know what happend" (Not likely I'd say) Everyone else delete at will !. Http://www.csn.ul.ie/~david Content-Type: TEXT/PLAIN; CHARSET=US-ASCII; NAME="RS232.HEX" Content-ID: Content-Description: original hex :020000000528D1 :08000800142888018316880109 :1000100020308C0019309900A43098008312903061 :100020009800C0308B00132806301805031D1E28C9 :100030008C1E09001A088800990009001812181669 :06004000FF3088000900FA :00000001FF Content-Type: TEXT/PLAIN; CHARSET=US-ASCII; NAME="READBACK.HEX" Content-ID: Content-Description: read back code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