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When Unlock Secured MCU ST7FMC1K2B3 Memory Program, it is necessary to talk about the system integrity management and start from auxiliary voltage detector,  The Voltage Detector function (AVD) is based on an analog comparison between a VIT-(AVD) and VIT+(AVD) reference value and the VDD main supply. The VIT- reference value for falling voltage is lower than the VIT+ reference value for rising voltage in order to avoid parasitic detection (hysteresis).

Unlock Secured MCU ST7FMC1K2B3 Memory Program

The output of the AVD comparator is directly readable by the application software through a real- time status bit (AVDF) in the SICSR register. This bit is read only. Caution: The AVD function is active only if the LVD is enabled through the option byte when reverse engineering microcontroller.

also engineer need to Monitor the VDD Main Supply, If the AVD interrupt is enabled, an interrupt is generated when the voltage crosses the VIT+(AVD) or VIT-(AVD) threshold (AVDF bit toggles). In the case of a drop in voltage, the AVD interrupt acts as an early warning, allowing software to shut down safely before the LVD resets the microcontroller to Decode STM Chip ST7FMC1K4B6 Software. See below figure:

Using the AVD to Monitor VDD

The interrupt on the rising edge is used to inform the application that the VDD warning state is over. If the voltage rise time trv is less than 256 or 4096 CPU cycles (depending on the reset delay select- ed by option byte), no AVD interrupt will be generated when VIT+(AVD) is reached when Unlock Secured MCU ST7FMC1K2B3 Memory Program.

If trv is greater than 256 or 4096 cycles then:

– If the AVD interrupt is enabled before the VIT+(AVD) threshold is reached, then 2 AVD interrupts will be received: the first when the AVDIE bit is set, and the second when the threshold is reached.

– If the AVD interrupt is enabled after the VIT+(AVD)threshold is reached then only one AVD interrupt will