STM32U535NET3QTR datasheet(22/278 Pages) STMICROELECTRONICS

22 / 278 page

Functional overview

STM32U535xx

22/278

DS14217 Rev 1

•

Supported cache accesses:

–

Both write-back and write-through policies supported (selectable with AHB

bufferable attribute)

–

Read and write-back always allocated

–

Write-through always non-allocated (write-around)

–

Byte, half-word and word writes supported

•

TrustZone security support

•

Maintenance operations for software management of cache coherency:

–

Full cache invalidation (non interruptible)

–

Address range clean and/or invalidate operations (background task, interruptible)

•

Error management: detection of error for master port request initiated by DCACHE (line

eviction or clean operation), with optional interrupt raising

3.3

Memory protection unit

The MPU (memory protection unit) is used to manage the CPU accesses to the memory

and to prevent one task to accidentally corrupt the memory or the resources used by any

other active task. This memory area is organized into up to 16 protected areas.

The MPU regions and registers are banked across secure and nonsecure states.

The MPU is especially helpful for applications where some critical or certified code must be

protected against the misbehavior of other tasks. It is usually managed by a 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 a RTOS environment, the kernel can dynamically update the

MPU area setting based on the process to be executed.

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

3.4

Embedded flash memory

The devices feature up to 512-Kbyte embedded flash memory that is available for storing

programs and data. The flash memory supports up to 100 000 cycles.

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

The flash memory interface features:

•

Dual-bank operating modes

•

Read-while-write (RWW)

This 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 32 pages of 8 Kbytes. The flash memory also embeds 512-byte OTP (one-time

programmable) for user data.

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

•

single-error detection and correction

•

double-error detection

•

ECC fail address report

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