STM32WB09XE datasheet(8/73 Pages) STMICROELECTRONICS

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Figure 2. Bus matrix

3.3

Memory protection unit (MPU)

The MPU is used to manage accesses to memory to prevent one task from accidentally corrupting the memory or

resources used by any other active task. This memory area is organized into up to 8 protected areas. The

protection area sizes are between 32 bytes and the whole 4 gigabytes of addressable memory.

The MPU is especially helpful for applications where some critical or certified code has to be protected against the

misbehavior of other tasks. It is usually managed by an RTOS (real-time operating system). If a program

accesses a memory location that is prohibited by the MPU, the RTOS can detect it and take action. In an RTOS

environment, the kernel can dynamically update the MPU area settings, based on the process to be executed.

The MPU is optional and can be bypassed for applications that do not need it.

3.4

Memories

3.4.1

Embedded flash memory

The flash controller implements the erase and program flash memory operation. The flash controller also

implements the read and write protection.

The flash memory features are:

•

Memory organization:

–

1 bank of 512 Kbytes

–

Page size: 2 Kbytes

–

Page number 256

•

32-bit wide data read

•

32-bit wide data write

•

Page erase and mass erase

The flash controller features are:

•

Flash memory read operations: single read or mass read

•

Flash memory write operations: single data write or 4x32-bits burst write or mass write

STM32WB09xE

Functional overview

DS14210 - Rev 6

page 8/73

STM32WB09XE Datasheet(PDF) 8 Page - STMicroelectronics