STM32H523CCU6 datasheet(23/228 Pages) STMICROELECTRONICS

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DS14540 Rev 1

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STM32H523xx

Functional overview

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_FS 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 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

STM32H523 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).

Table 3. STM32H523 boot mode when TrustZone is disabled (TZEN = 0xC3)

PRODUCT_STATE

BOOT0 pin

Boot address

option byte selection

Boot area

ST programmed

default value

Open

NSBOOTADD[31:8]

Boot address defined

by user option byte

NSBOOTADD[31:8]

Flash: 0x0800 0000

Bootloader

Provisioning

RSS

Provisioned, Closed,

Locked

NSBOOTADD[31:8]

Boot address defined

by user option byte

NSBOOTADD[31:8]

Flash: 0x0800 0000

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