STM32WBA62CG datasheet(21/185 Pages) STMICROELECTRONICS

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DS14736 Rev 1

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STM32WBA6xxx

Functional overview

3.5.2

Additional flash memory protections when TrustZone is activated

When the TrustZone security is enabled through option bytes, the whole flash memory is

secure after reset and the following protections are available:

•

Nonvolatile watermark-based secure flash memory area

The secure area can be accessed only in Secure mode. One area can be selected with

a page granularity.

•

Secure hide protection area (HDP)

It is part of the flash memory secure area and can be protected to deny access to this

area by any data read, write, and instruction fetch. For example, a software code in the

secure flash memory hide protection area can be executed only once and deny any

further access to this area until the next system reset. One area can be selected at the

beginning of the secure area.

•

Volatile block-based secure flash memory area

Each page can be programmed on-the-fly as secure or nonsecure.

3.5.3

FLASH privilege protection

Each flash memory page can be programmed on-the-fly as privileged or unprivileged.

OTP

0.5

Yes

Yes(7)

N/A

Yes

Yes(7)

N/A

1Yes

Yes(7)

N/A

Yes

Yes(7)

N/A

2Yes

Yes(7)

N/A

Backup registers

0.5

Yes

N/A

Yes(2)

N/A(8)

Yes

N/A

N/A(8)

Yes

N/A

SRAM2

0.5

Yes

N/A

Yes(2)

N/A(9)

Yes

N/A

N/A(9)

Yes

N/A

1. When the protection level 2 is active, the debug port and the bootloader mode are disabled.

2. Depends on TrustZone security access rights.

3. The system memory is only read-accessible, whatever the protection level (0, 1 or 2) and execution mode.

4. Option bytes are only accessible through the flash registers interface and OPSTRT bit.

5. The flash main memory is erased when the RDP option byte regresses from level 1 to level 0.

6. SWAP_BANK user option can be modified.

7. OTP can be written only once.

8. The backup registers are erased when RDP changes from level 1 to level 0.

9. All SRAMs are erased when RDP changes from level 1 to level 0.

Table 4. Access status versus protection level and execution modes when TZEN = 1 (continued)

Area

RDP

level

User execution

(boot from flash memory)

Debug/bootloader(1)

Read

Write

Erase

Read

Write

Erase

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