STM32U545CE datasheet(28/283 Pages) STMICROELECTRONICS

28 / 283 page

Functional overview

STM32U545xx

28/283

DS14216 Rev 1

3.6.1

TrustZone peripheral classification

When the TrustZone security is active, a peripheral can be either securable or

TrustZone-aware type as follows:

•

securable: peripheral protected by an AHB/APB firewall gate that is controlled from

TZSC to define security properties

•

TrustZone-aware: peripheral connected directly to AHB or APB bus and implementing

a specific TrustZone behavior such as a subset of registers being secure

3.6.2

Default TrustZone security state

The default system security state is detailed below:

•

CPU:

–

Cortex-M33 is in secure state after reset. The boot address must be in secure

address.

•

Memory map:

–

SAU is fully secure after reset. Consequently, all memory map is fully secure.

Up to eight SAU configurable regions are available for security attribution.

•

Flash memory:

–

Flash memory security area is defined by watermark user options.

–

Flash memory block based area is nonsecure after reset.

•

SRAMs:

–

All SRAMs are secure after reset. MPCBB (memory protection block based

controller) is secure.

•

External memories:

–

OCTOSPI banks are secure after reset. MPCWMx (memory protection watermark

based controller) is secure.

•

Peripherals

–

Securable peripherals are nonsecure after reset.

–

TrustZone-aware peripherals are nonsecure after reset. Their secure configuration

registers are secure.

•

All GPIOs are secure after reset.

•

Interrupts:

–

NVIC: All interrupts are secure after reset. NVIC is banked for secure and

nonsecure state.

•

TZIC: All illegal access interrupts are disabled after reset.

3.7

Boot modes

At startup, a BOOT0 pin, NBOOT0, NSBOOTADDx[24:0] (x = 0, 1) and

SECBOOTADD0[24:0] option bytes are used to select the boot memory address that

includes:

•

Boot from any address in user flash memory.

•

Boot from system memory bootloader.

•

Boot from any address in embedded SRAM.

•

Boot from RSS (root security services).

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