STM32WLE4JC datasheet(18/146 Pages) STMICROELECTRONICS

18 / 146 page

Functional overview

STM32WLE5/E4xx

18/146

DS13105 Rev 9

3.6

Security management

The devices contain many security blocks, such as:

•

RNG

•

AES: 128-and 256-bit AES, supporting ECB, CBC, CTR, GCM, GMAC and CCM

chaining modes

•

PKA:

–

modular arithmetic including exponentiation with maximum modulo size of

3136 bits

–

elliptic curves over prime field scalar multiplication, ECDSA signature, ECDSA

verification with maximum modulo size of 521 bits

•

cyclic redundancy check calculation unit (CRC)

3.7

Boot modes

At startup, BOOT0 pin and BOOT1 option bit are used to select one of the following boot

options:

•

Boot from user Flash memory

•

Boot from boot system memory (where embedded bootloader is located)

•

Boot from embedded SRAM

The bootloader makes possible to download code from USART or SPI.

If the boot selection uses the BOOT0 pin to boot from the main Flash memory, but the first

Flash memory location is found empty, the Flash empty check mechanism forces boot from

the system memory (containing the embedded bootloader). Then, due to the bootloader

activation, some of the GPIOs are reconfigured from the high-Z state. Refer to the

application note STM32 microcontroller system memory boot mode (AN2606) for more

details concerning the bootloader and GPIOs configuration.

This feature can be disabled by configuring the option bytes (instead of BOOT0 pin) to force

boot from the main Flash memory (nSWBOOT0 = 0, nBOOT0 = 1).

3.8

Sub-GHz radio

3.8.1

Sub-GHz radio introduction

The sub-GHz radio is an ultra-low-power sub-GHz radio operating in the 150 - 960 MHz ISM

band. LoRa, (G)FSK/(G)MSK modulation in transmit and receive, and (D)BPSK in transmit

only, allow an optimal trade-off between range, data rate and power consumption. This

sub-GHz radio is compliant with the LoRaWAN® specification v1.0 and radio regulations

such as ETSI EN 300 220, EN 300 113, EN 301 166, FCC CFR 47 part 15, 24, 90, 101 and

the ARIB STD-T30, T-67, T-108.

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