STM32F318C8 datasheet(13/125 Pages) STMICROELECTRONICS

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STM32F318C8 STM32F318K8

Functional overview

3.4

Cyclic redundancy check calculation unit (CRC)

The CRC (cyclic redundancy check) calculation unit is used to get a CRC code using a

configurable generator polynomial value and size.

Among other applications, CRC-based techniques are used to verify data transmission or

storage integrity. 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

linktime and stored at a given memory location.

3.5

Power management

3.5.1

Power supply schemes



VSS, VDD = 1.8 V ± 8% V: external power supply for I/Os and the internal regulator. It is

provided externally through VDD pins.



VSSA, VDDA = 1.65 to 3.6 V: external analog power supply for ADC, DAC, comparators,

operational amplifier, reset blocks, RCs and PLL. The minimum voltage to be applied to

VDDA differs from one analog peripheral to another. Table 2 provides the summary of

the VDDA ranges for analog peripherals. The VDDA voltage level must always be greater

than or equal to the VDD voltage level and must be provided first.



VBAT = 1.65 to 3.6 V: power supply for RTC, external clock 32 kHz oscillator and

backup registers (through power switch which is guaranteed in the full range of VDD)

when VDD is not present.

3.5.2

Power supply supervisor

The device power-on reset (POR) is controlled through the external NPOR pin. The device

remains in reset state when NPOR pin is held low.

To guarantee a proper power-on reset, the NPOR pin must be held low when VDDA is

applied. Then, when VDD is stable, the reset state can be exited by:



either putting the NPOR pin in high impedance, NPOR pin has an internal pull up



on forcing the pin to high level by connecting it to VDDA.

Table 2. External analog supply values for analog peripherals

Analog peripheral

Minimum VDDA supply

Maximum VDDA supply

ADC/COMP

1.8 V

3.6 V

DAC/OPAMP

2.4 V

3.6 V

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