STM32U535NET3QTR datasheet(30/278 Pages) STMICROELECTRONICS

30 / 278 page

Functional overview

STM32U535xx

30/278

DS14217 Rev 1

The boot address option bytes allow any boot memory address to be programmed.

However, the allowed address space depends on the flash memory RDP level.

If the programmed boot memory address is out of the allowed memory mapped area when

RDP level is 0.5 or more, the default boot address is forced either in secure flash memory or

nonsecure flash memory, depending on TrustZone security option as described in the table

below.

Table 7. Boot modes when TrustZone is enabled (TZEN = 1)

BOOT_

LOCK

NBOOT0

FLASH_

OPTR[27]

BOOT0

PH3

NSWBOOT0

FLASH_

OPTR[26]

RSS

com-

mand

Boot address

option-bytes

selection

Boot area

ST pro-

grammed

default value

-0

SECBOOTADD0

[24:0]

Secure boot address

defined by user

option bytes

SECBOOTADD0[24:0]

Flash:

0x0C00 0000

-1

N/A

RSS

RSS:

0x0FF8 0000

SECBOOTADD0

[24:0]

Secure boot address

defined by user

option bytes

SECBOOTADD0[24:0]

Flash:

0x0C00 0000

N/A

RSS

RSS:

0x0FF8 0000

≠0N/A

RSS

RSS:

0x0FF8 0000

SECBOOTADD0

[24:0]

Secure boot address

defined by user

option bytes

SECBOOTADD0[24:0]

Flash:

0x0C00 0000

Table 8. Boot space versus RDP protection

RDP

TZEN = 1

TZEN = 0

Any boot address

0.5

Boot address only in RSS or secure flash memory:

0x0C00 0000 - 0x0C07 FFFF

Otherwise, forced boot address is 0x0FF8 0000.

N/A

Any boot address

Boot address only in flash memory

0x0800 0000 - 0x0807 FFFF

Otherwise, forced boot address is 0x0800 0000.

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