STM32H757AI datasheet(22/251 Pages) STMICROELECTRONICS

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Functional overview

STM32H757xI

22/251

DS12931 Rev 1

3.3

Memories

3.3.1

Embedded Flash memory

The STM32H757xI devices embed 2 Mbytes of Flash memory that can be used for storing

programs and data.

The Flash memory is organized as 266-bit Flash words memory that can be used for storing

both code and data constants. Each word consists of:

•

One Flash word (8 words, 32 bytes or 256 bits)

•

10 ECC bits.

The Flash memory is divided into two independent banks. Each bank is organized as

follows:

•

1 Mbyte of user Flash memory block containing eight user sectors of 128 Kbytes

(4 K Flash memory words)

•

128 Kbytes of System Flash memory from which the device can boot

•

2 Kbytes (64 Flash words) of user option bytes for user configuration

3.3.2

Secure access mode

In addition to other typical memory protection mechanism (RDP, PCROP), STM32H757xI

devices introduce the Secure access mode, a new enhanced security feature. This mode

allows developing user-defined secure services by ensuring, on the one hand code and

data protection and on the other hand code safe execution.

Two types of secure services are available:

•

STMicroelectronics Root Secure Services:

These services are embedded in System memory. They provide a secure solution for

firmware and third-party modules installation. These services rely on cryptographic

algorithms based on a device unique private key.

•

User-defined secure services:

These services are embedded in user Flash memory. Examples of user secure

services are proprietary user firmware update solution, secure Flash integrity check or

any other sensitive applications that require a high level of protection.

The secure firmware is embedded in specific user Flash memory areas configured

through option bytes.

Secure services are executed just after a reset and preempt all other applications to

guarantee protected and safe execution. Once executed, the corresponding code and data

are no more accessible.

The above secure services are available only for Cortex®-M7 core operating in Secure

access mode. The other masters cannot access the option bytes involved in Secure access

mode settings or the Flash secured areas.

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