STM32WBA62CGF6 datasheet(25/185 Pages) STMICROELECTRONICS

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DS14736 Rev 1

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STM32WBA6xxx

Functional overview

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.

The boot address option bytes allow to program any boot memory address, but 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 higher, the

default boot address is forced either in secure or nonsecure flash memory, depending on

TrustZone security option, as detailed in Table 8.

NSBOOTADD0[24:0]

Boot address defined by

user option bytes

NSBOOTADD0[24:0]

Flash memory:

0x0800 0000

NSBOOTADD1[24:0]

Boot address defined by

user option bytes

NSBOOTADD1[24:0]

System bootloader:

0x0BF9 0000

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

nBOOT0

FLASH_

OPTR[27]

BOOT0

pin PH3

nSWBOOT0

FLASH_

OPTR[26]

Boot address

option-bytes

selection

Boot area

ST programmed

default value

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

nBOOT0

FLASH_

OPTR[27]

BOOT0

PH3

nSWBOOT0

FLASH_

OPTR[26]

Boot address

option bytes

selection

Boot area

programmed

default value

-0

SECBOOT-

ADD0[24:0]

Secure boot address defined

by user option bytes

SECBOOTADD0[24:0]

Flash memory:

0x0C00 0000

-1

N/A

RSS

RSS:

0x0FF8 0000

SECBOOT-

ADD0[24:0]

Secure boot address defined

by user option bytes

SECBOOTADD0[24:0]

Flash memory:

0x0C00 0000

N/A

RSS

RSS:

0x0FF8 0000

≠0N/A

RSS

RSS:

0x0FF8 0000

SECBOOT-

ADD0[24:0]

Secure boot address defined

by user option bytes

SECBOOTADD0[24:0]

Flash memory:

0x0C00 0000

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