STM32L432KB datasheet(16/149 Pages) STMICROELECTRONICS

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Functional overview

STM32L432KB STM3L432KC

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DocID028798 Rev 2

3.7

Boot modes

At startup, BOOT0 pin or nSWBOOT0 option bit, and BOOT1 option bit are used to select

one of three boot options:

•

Boot from user Flash

•

Boot from system memory

•

Boot from embedded SRAM

BOOT0 value may come from the PH3-BOOT0 pin or from an option bit depending on the

value of a user option bit to free the GPIO pad if needed.

A Flash empty check mechanism is implemented to force the boot from system flash if the

first flash memory location is not programmed and if the boot selection is configured to boot

from main flash.

The boot loader is located in system memory. It is used to reprogram the Flash memory by

using USART, I2C, SPI and USB FS in Device mode through DFU (device firmware

upgrade).

3.8

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.

3.9

Power supply management

3.9.1

Power supply schemes

•

VDD = 1.71 to 3.6 V: external power supply for I/Os (VDDIO1), the internal regulator and

the system analog such as reset, power management and internal clocks. It is provided

externally through VDD pins.

•

VDDA = 1.62 V (ADCs/COMPs) / 1.8 (DACs/OPAMP) to 3.6 V: external analog power

supply for ADCs, DACs, OPAMP, Comparators and Voltage reference buffer. The VDDA

voltage level is independent from the VDD voltage.

Note:

When the functions supplied by VDDA or VDDUSB are not used, these supplies should

preferably be shorted to VDD.

Note:

If these supplies are tied to ground, the I/Os supplied by these power supplies are not 5 V

tolerant (refer to Table 17: Voltage characteristics).

Note:

VDDIOx is the I/Os general purpose digital functions supply. VDDIOx represents VDDIO1, with

VDDIO1 = VDD.

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