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Brown out is a traditional way for designer to resist tampering of security system on Mcu, Crack MCU P89CV51 Locked Code also needs to find the detection circuit, The device includes a brown-out detection circuit to protect the system from severe supply voltage fluctuations. The P89CV51’s brown-out detection threshold is 2.35 V.

When VDD drops below this voltage threshold, the brown-out detect triggers the circuit to generate a brown-out interrupt but the CPU still runs until the supplied voltage returns to the brown-out detection voltage VBOD.

The default operation for a brown-out detection is to cause a processor reset. VDD must stay below VBOD at least four oscillator clock periods before the brown-out detection circuit will respond.

Crack MCU P89CV51 Locked Code

Brown-out interrupt can be enabled by setting the EBO bit (IEA.3). If EBO bit is set and a brown-out condition occurs, a brown-out interrupt will be generated to execute the program at location 004BH.

It is required that the EBO bit be cleared by software after the brown-out interrupt is serviced. Clearing EBO bit when the brown-out condition is active will properly reset the device. If brown-out interrupt is not enabled, a brown-out condition will read the MCU program to resume execution at location 0000H. A brown-out detect reset will clear the BSEL bit (FCF.0) but will not change the SWR bit (FCF.1) and therefore will not change the banking of the lower 8 kB of user code memory space.