STM32H533CE datasheet(23/231 Pages) STMICROELECTRONICS

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DS14539 Rev 1

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STM32H533xx

Functional overview

STM32H533xx devices are powered by an Arm Cortex-M33 microcontroller, which is

associated with all the TrustZone isolation infrastructure. This design permits to benefit from

a run time isolation to run secure applications.

3.7

Boot modes

At startup, a BOOT0 pin and NSBOOTADD[31:8]/SECBOOTADD[31:8] 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

–

ST immutable root of trust (ST-iROT)

–

Root security service (RSS)

–

Debug authentication library (RSS-DA)

Embedded bootloader

The embedded bootloader is located in the system memory, programmed by ST during

production. It is used to reprogram the flash memory by using USART, I2C, I3C, SPI,

FDCAN, or USB in device mode through the DFU (device firmware upgrade).

Refer to AN2606 STM32 microcontroller system memory boot mode.

Embedded root security services (RSS)

The embedded RSS are located in the secure information block, programmed by ST during

production.

Refer to AN4992 Overview secure firmware install (SFI).

Embedded immutable root of trust (ST-iROT)

The embedded ST-iROT in the system memory, programmed by ST during production. ST-

iROT is the immutable root of trust managing the secure boot and secure install of the first

updatable level to execute in a boot sequence.

Embedded debug authentication (ST-DA)

The embedded ST-DA in the system memory, programmed by ST during production. ST-DA

is the library that manages the debug authentication protocol by allowing to securely reopen

the debug or to launch regressions on secured products in the field.

For further information, refer to AN6008 “Getting started with debug authentication (DA) for

STM32H5 MCUs”.

3.7.1

STM32H533xx boot modes

Table 3 and Table 4, respectively, provide the detail of the boot mode when TrustZone is

disabled (TZEN = 0xC3) and enabled (TZEN = 0xB4).

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