> On Mon, 29 Sep 1997 14:10:12 -0700 WF AUTOMA=?iso-8859-1?Q?=C7=C3O ?= > writes: > >Does someone know how to desprotect a EEPROM of PIC16C84? > > The method reported a couple of years ago was to raise Vdd to about 12V, > go into programming mode and write 1 to the CP bit several times. Upon > lowering Vdd to normal range, the chip could be read unprotected, both > the program and data EEPROM. I never tried it though. I've also read that that 'exact' method is a trap (something to try to entice people to blow up chips, maybe?) but that at least for the older parts there were related methods that did work (my conjecture would be that the best goal would be to play VDD games to "trick" the part into thinking it's not code-protected, but that would require a lower VDD rather than a higher one). With the newer 'F84 parts, the old methods of cracking supposedly no longer work, but I have no idea whether new ones exist.