Extract MCU need to use a series of different methods and clock glitches is one of the most effective methods. This MCU Extract method is the most practical and simplest method. In the application process, the noise will be used to replaced the switch terms and test the previous testing order. Can create a extraction windows when the system consult the security password, and prevent the execution of these orders simply. Instruction noise can also be used to extent the cycle time. For example, sub-program in the serial interface can read and extract mcu more content after suffering; or reduce the cycle times to pass a relative weak code when extract MCU.

In order to obtain the noise, clock need to add one and a half cycle temporarily when extract MCU, some triggers can be input before the it reach the new status. Time clock is normally against the order flow in the processor. And there is no effect to the microprocessor when extract MCU and process the new protection. In the practice, only use the clock glitch to extract MCU or smartcard software program interface.