STM32G070KB datasheet(14/93 Pages) STMICROELECTRONICS

14 / 93 page

Functional overview

STM32G070CB/KB/RB

14/93

DS12766 Rev 2

3.5

Boot modes

At startup, the boot pin and boot selector option bit are used to select one of the three boot

options:



boot from User Flash memory



boot from System memory



boot from embedded SRAM

The boot pin is shared with a standard GPIO and can be enabled through the boot selector

option bit. The boot loader is located in System memory. It manages the Flash memory

reprogramming through USART on pins PA9/PA10, PC10/PC11 or PA2/PA3, through I2C-

bus on pins PB6/PB7 or PB10/PB11, or through SPI on pins PA4/PA5/PA6/PA7 or

PB12/PB13/PB14/PB15.

3.6

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 link

time and stored at a given memory location.

3.7

Power supply management

3.7.1

Power supply schemes

The STM32G070CB/KB/RB devices require a 2.0 V to 3.6 V operating supply voltage (VDD).

Several different power supplies are provided to specific peripherals:



VDD = 2.0 to 3.6 V

VDD is the external power supply for the internal regulator and the system analog such

as reset, power management and internal clocks. It is provided externally through

VDD/VDDA pin.



VDDA = 2.0 V to 3.6 V

VDDA is the analog power supply for the A/D converter. VDDA voltage level is identical to

VDD voltage as it is provided externally through VDD/VDDA pin.



VDDIO1 = VDD

VDDIO1 is the power supply for the I/Os. VDDIO1 voltage level is identical to VDD voltage

as it is provided externally through VDD/VDDA pin.



VBAT = 1.55 V to 3.6 V. VBAT is the power supply (through a power switch) for RTC,

TAMP, low-speed external 32.768 kHz oscillator and backup registers when VDD is not

present. VBAT is provided externally through VBAT pin. When this pin is not available

on the package, VBAT bonding pad is internally bonded to the VDD/VDDA pin.



VREF+ is the analog peripheral input reference voltage. When VDDA < 2 V, VREF+ must

be equal to VDDA. When VDDA ≥ 2 V, VREF+ must be between 2 V and VDDA. It can be

grounded when the analog peripherals using VREF+ are not active.

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