STM32WBA62CG datasheet(19/185 Pages) STMICROELECTRONICS

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DS14736 Rev 1

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STM32WBA6xxx

Functional overview

3.5

Embedded flash memory

The devices feature an up to 2-Mbyte embedded flash memory, available to store programs

and data. This memory supports 10000 cycles, and up to 100000 cycles on 64 pages

(512 Kbytes).

A 128-bit instruction prefetch is implemented and can optionally be enabled.

The flash memory interface features dual-bank operation modes and read-while-write

(RWW), hence a read operation to be performed from one bank while an erase or program

operation is performed on the other bank. The dual-bank boot is also supported. Each bank

contains up to 128 pages of 8 Kbytes. The flash memory also embeds a 512-byte one-time

programmable (OTP) memory for user data.

The whole nonvolatile memory embeds the error correction code (ECC) feature supporting:

•

single-error detection and correction

•

double-error detection

•

ECC fail address report

3.5.1

Flash memory protections

The user options allow the configuration of flexible protections:

•

write protection (WRP) to protect areas against erasing and programming. Two areas

per bank can be selected with 8-Kbyte granularity

•

readout protection (RDP) to protect the whole memory, has four levels of protection

available (see Table 3 and Table 4):

–

Level 0: no readout protection

–

Level 0.5: available only when TrustZone is enabled

All read/write operations (if no write protection is set) from/to the nonsecure flash

memory are possible. The debug access to secure area is prohibited. Debug

access to nonsecure area remains possible.

–

Level 1: memory readout protection

The flash memory cannot be read from or written to if either the debug features

are connected or the boot in RAM or bootloader are selected. If TrustZone is

enabled, the nonsecure debug is possible and the boot in SRAM is not possible.

Regressions from Level 1 to lower levels can be protected by password

authentication.

–

Level 2: chip readout protection

The debug features, the boot in RAM and the bootloader selection are disabled. A

secure secret key can be configured in the secure options to allow the regression

capability from Level 2 to Level 1. By default (key not configured), this Level 2

selection is irreversible and JTAG/SWD interfaces are disabled. If the secret key

was previously configured in lower RDP levels, the device enables the RDP

regression from Level 2 to Level 1 after password authentication through

JTAG/SWD interface.

Note:

To reach the best protection level, it is recommended to activate TrustZone and to set RDP

level 2 with password authentication regression enabled.

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