Copy Microcontroller Prevention

Copy Microcontroller Prevention has a great variety of methods, and burning out it read/write pinout circuit and its test terminal can effectively prevent the microcontroller copy. turn the pinout burning out from some general Microcontrollers could be an very effective way to increase the cost of copy Microcontroller. Similar method has also been applied on the smartcard, some of the terminals which have been used as the production test and flash programming, they can be wiped out physically after test.

Most of the Microcontroller is able to be read and written freely after the shielding of security fuse by the microcontroller copyer. Burn out one of the pinouts, even the security fuse has been wiped out, it can still prevent the external visiting from the programming on the memory. At the same time, most of the microcontrollers which base upon the flash memorizer can upgrade its program when copy microcontroller through the initiating block of user code area, without the usage of parallel programmer to avoid the microcontroller copy. write the initiation block before burn out, burn out won’t affect the upgrade of program.

It is very easy to burn out the pinout, add voltage, no matter the positive or negative, about reach the maximum value which the pinout lead can withstand, and it will has around 1A current to go through it which can cause the eternal damage on the transistor on the pinout lead: positive voltage on the high level can damage PMOS, negative voltage on the low level will damage NMOS to prevent the microcontroller copy.