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Extract ARM MCU STM32F051K4 Flash Code needs to unlock readout protection mechanism of microcontroller stm32f051k4 and then clone embedded firmware to new chip stm32f051k4;

The device has integrated power-on reset (POR) and power-down reset (PDR) circuits. They are always active, and ensure proper operation above a threshold of 2 V which is also important for unlock arm mcu stm8L001F3 microcontroller memory. The device remains in reset mode when the monitored supply voltage is below a specified threshold, VPOR/PDR, without the need for an external reset circuit.

• The POR monitors only the VDD supply voltage. During the startup phase it is required that VDDA should arrive first and be greater than or equal to VDD.
  • The PDR monitors both the VDD and VDDA supply voltages, however the VDDA power supply supervisor can be disabled (by programming a dedicated Option bit) to reduce the power consumption if the application design ensures that VDDA is higher than or equal to VDD.

The device features an embedded programmable voltage detector (PVD) that monitors the VDD power supply and compares it to the VPVD threshold. An interrupt can be generated when VDD drops below the VPVD threshold and/or when VDD is higher than the VPVD threshold.

The interrupt service routine can then generate a warning message and/or put the MCU into a safe state. The PVD is enabled by software.