STM32WBA62CG datasheet(60/185 Pages) STMICROELECTRONICS

60 / 185 page

Functional overview

STM32WBA6xxx

60/185

DS14736 Rev 1

detection with or without filtering, or active tamper that increases the security level by auto

checking that the tamper pins are not externally opened or shorted.

TAMP main features:

•

A tamper detection can erase the backup registers, SRAM2, ICACHE and

cryptographic peripherals.

•

32 32-bit backup registers:

–

The backup registers (TAMP_BKPxR) are implemented in the Backup domain that

remains powered-on by VDD power.

•

Up to six tamper pins for six external tamper detection events:

–

Active tamper mode: continuous comparison between tamper output and input to

protect from physical open-short attacks

–

Flexible active tamper I/O management: from three meshes (each input

associated to its own exclusive output) to five meshes (single output shared for up

to five tamper inputs)

–

Passive tampers: ultra-low-power edge or level detection with internal pull-up

hardware management

–

Configurable digital filter

•

Nine internal tamper events to protect against transient or environmental perturbation

attacks:

–

LSE monitoring

–

RTC calendar overflow

–

JTAG/SWD access if RDP different from 0

–

Monotonic counter overflow

–

Cryptographic peripherals fault (RNG, SAES, AES, PKA)

–

Independent watchdog reset when tamper flag is already set

–

Three ADC4 watchdogs

•

Each tamper can be configured in two modes:

–

Hardware mode: immediate erase of secrets on tamper detection, including

backup registers erase

–

Software mode: erase of secrets following a tamper detection launched by

software

•

Any tamper detection can generate a RTC time stamp event.

•

TrustZone support:

–

Tamper secure or nonsecure configuration.

–

Backup registers configuration in three configurable-size areas:

- a read/write secure area

- a write secure/read nonsecure area

- a read/write nonsecure area

–

Secret boot hardware key (BHK) only usable by secure SAES peripheral, stored in

backup registers, protected against read and write access

•

Tamper configuration and backup registers privilege protection

•

Monotonic counter

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