STM32U535NET3QTR datasheet(29/278 Pages) STMICROELECTRONICS

29 / 278 page

DS14217 Rev 1

29/278

STM32U535xx

Functional overview

The RSS are available on all devices, after enabling the TrustZone through the TZEN option

bit. Refer to the application note Overview secure firmware install (SFI) (AN4992)

for more details.

Refer to Table 6 and Table 7 for boot modes when TrustZone is disabled and

enabled respectively.

When TrustZone is enabled by setting the TZEN option bit, the boot space must be in the

secure area. The SECBOOTADD0[24:0] option bytes are used to select the boot secure

memory address.

A unique boot entry option can be selected by setting the BOOT_LOCK option bit, allowing

to boot always at the address selected by SECBOOTADD0[24:0] option bytes. All other boot

options are ignored.

Table 6. Boot modes when TrustZone is disabled (TZEN = 0)

NBOOT0

FLASH_

OPTR[27]

BOOT0

pin PH3

NSWBOOT0

FLASH_

OPTR[26]

Boot address

option-byte

selection

Boot area

ST programmed

default value

NSBOOTADD0[24:0]

Boot address defined by

user option bytes

NSBOOTADD0[24:0]

Flash: 0x0800 0000

NSBOOTADD1[24:0]

Boot address defined by

user option bytes

NSBOOTADD1[24:0]

Bootloader:

0x0BF9 0000

NSBOOTADD0[24:0]

Boot address defined by

user option bytes

NSBOOTADD0[24:0]

Flash: 0x0800 0000

NSBOOTADD1[24:0]

Boot address defined by

user option bytes

NSBOOTADD1[24:0]

Bootloader:

0x0BF9 0000

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