ive been told that the only way of doing was having lots of money and lots of pics to burn also. they open the pic with high presicion instruments and with the use of microscopes they try to "rebuild" the burned fuses that keep the code protected.
could be true...
i think that you can do it with software. My only guess is to make software that resets the fuses but keeps the data in. But of course this can only be done with the "f" type chips, since they are flashable.
i think that you can do it with software. My only guess is to make software that resets the fuses but keeps the data in. But of course this can only be done with the "f" type chips, since they are flashable.
There used to be a way to break the protection on the old 16C84, which was one of the reasons it was replaced by the 16F84 - as far as I know the F series chips have been pretty secure.
microchip is obligated to make their chips secure, otherwise companies making products wouldn't buy their microcontrollers, if they weren't secure... I'm sure that as a built-in hardware function, any time you change the fuses, you erase the program or something like that.
microchip is obligated to make their chips secure, otherwise companies making products wouldn't buy their microcontrollers, if they weren't secure... I'm sure that as a built-in hardware function, any time you change the fuses, you erase the program or something like that.
microchip is obligated to make their chips secure, otherwise companies making products wouldn't buy their microcontrollers, if they weren't secure... I'm sure that as a built-in hardware function, any time you change the fuses, you erase the program or something like that.
Talking about UV's... When you want to erase a 12C508 UV.. Be sure to first read & save the oscilator calibration value. this value is ereased along with the program and a real pain to come up with a good value again... learned that the hard way :?
I figured it would be (near) impossible as it otherwize would not be very costeffective to add a protection that could be cracked. I stumbled upon a guy in another forum that stated he could read code protected pic and another guy that said that it should be possible by writing you own piece of software that could just reset the protection.
I have read a process. It could be done only on PIC16F84 and microchip has redisigned the security option for the new F84's on the market.
Besides you have 99.99% to burn the pic (you need 27V to reset the fuses)