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Crack ARM Microcontroller STM32F051R4 Locked Bit by focus ion beam, the flash memory program embedded inside flash of microprocessor stm32f051r4 will be readout, to restore the mcu chip stm32f051r4 functions;

The Standby mode is used to achieve the lowest power consumption. The internal voltage regulator is switched off so that the entire 1.8 V domain is powered off. The PLL, the HSI RC and the HSE crystal oscillators are also switched off.

After entering Standby mode, SRAM and register contents are lost except for registers in the RTC domain and Standby circuitry. The device exits Standby mode when an external reset (NRST pin) when attacking arm microcontroller stm32f051c4 flash memory, an IWDG reset, a rising edge on the WKUP pins, or an RTC event occurs.

The RTC, the IWDG, and the corresponding clock sources are not stopped by entering Stop or Standby mode.

System clock selection is performed on startup, however the internal RC 8 MHz oscillator is selected as default CPU clock on reset. An external 4-32 MHz clock can be selected, in which case it is monitored for failure. If failure is detected, the system automatically switches back to the internal RC oscillator.

A software interrupt is generated if enabled. Similarly, full interrupt management of the PLL clock entry is available when necessary (for example on failure of an indirectly used external crystal, resonator or oscillator) in order to break stm32f051c6 ic chip locked bit. Several prescalers allow the application to configure the frequency of the AHB and the APB domains. The maximum frequency of the AHB and the APB domains is 48 MHz.