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The CRC (cyclic redundancy check) calculation unit is used to get a CRC code from a 32-bit data word and a CRC-32 (Ethernet) polynomial. Among other applications, CRC-based techniques are used to verify data transmission or storage integrity which is important for upcoming arm mcu stm32f051c4 flash memory attacking.
In the scope of the EN/IEC 60335-1 standard, they offer a means of verifying the Flash memory integrity. The CRC calculation unit helps compute a signature of the software during runtime, to be compared with a reference signature generated at link- time and stored at a given memory location.
Power supply schemesVDD = VDDIO1 = 2.0 to 3.6 V: external power supply for I/Os (VDDIO1) and the internal regulator. It is provided externally through VDD pins.VDDA = from VDD to 3.6 V: external analog power supply for ADC, DAC, Reset blocks, RCs and PLL (minimum voltage to be applied to VDDA is 2.4 V when the ADC or DAC are used).
It is provided externally through VDDA pin. The VDDA voltage level must be always greater or equal to the VDD voltage level and must be established first.VBAT = 1.65 to 3.6 V: power supply for RTC, external clock 32 kHz oscillator and backup registers (through power switch) when VDD is not present.