STM32L552CC_V01 datasheet(22/340 Pages) STMICROELECTRONICS

22 / 340 page

Functional overview

STM32L552xx

22/340

DS12737 Rev 6

3.4

Embedded Flash memory

The devices feature 512 Kbytes of embedded Flash memory which is available for storing

programs and data.

The Flash interface features:

•

Single or dual bank operating modes

•

Read-while-write (RWW) in dual bank mode

This feature allows a read operation to be performed from one bank while an erase or

program operation is performed to the other bank. The dual bank boot is also supported.

Each bank contains 128 pages of 2 or 4 Kbytes (depending on the read access width). The

Flash memory also embeds 512 bytes OTP (one-time programmable) for user data.

Flexible protections can be configured thanks to the option bytes:

• Readout protection (RDP) to protect the whole memory. Four levels of protection are

available:

– 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 non-secure Flash

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

to non-secure 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 non-secure debug is possible and the boot in

SRAM is not possible.

– Level 2: chip readout protection; the debug features (Cortex®-M33 JTAG and serial

wire), the boot in RAM and the bootloader selection are disabled (JTAG fuse). This

selection is irreversible.

•

Write protection (WRP): the protected area is protected against erasing and

programming:

–

In single bank mode, four areas can be selected with 4-Kbyte granularity.

–

In dual bank mode, two areas per bank can be selected with 2-Kbyte granularity.

The whole non-volatile memory embeds the error correction code (ECC) feature supporting:

•

Single error detection and correction

•

Double error detection

•

The address of the ECC fail can be read in the ECC register.

TrustZone security

When the TrustZone security is enabled, the whole Flash is secure after reset and the

following protections are available:

•

Non-volatile watermark-based secure Flash area: the secure area can be accessed

only in secure mode.

–

In single bank mode, four areas can be selected with a page granularity.

–

In dual bank mode, one area per bank can be selected with a page granularity.

•

Secure hidden protection area: it is part of the Flash secure area and it can be

protected to deny an access to this area by any data read, write and instruction fetch.

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