Datasheet

DS12556 Rev 2 19/201
STM32H750VB STM32H750IB STM32H750XB Functional overview
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3.3 Memories
3.3.1 Embedded Flash memory
The STM32H750xB devices embed 128 Kbytes of Flash memory that can be used for
storing programs and data.
The Flash memory is organized as follows:
• 128 Kbytes of user Flash memory containing 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), STM32H750xB
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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