SLUUDG7 December   2025 MSPM33C321A

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Overview of Security Functionality
    1. 1.1 Terminology
  5. 2Secure Execution Environment
    1. 2.1 TrustZone
      1. 2.1.1 Implementation Defined Attribution Unit
      2. 2.1.2 Security Attribution Unit
      3. 2.1.3 TrustZone software development
    2. 2.2 Memory Protection Unit
      1. 2.2.1 TrustZone and MPU
    3. 2.3 Global Security Controller
      1. 2.3.1 GSC Memory configuration
        1. 2.3.1.1 Security Exceptions through the GSC & SAU
        2. 2.3.1.2 Priviledge exceptions with GSC & MPU
  6. 3Security Modules
    1. 3.1 AES
      1. 3.1.1 AES Overview
      2. 3.1.2 AES Usage
        1. 3.1.2.1 Configuration
        2. 3.1.2.2 Setup
        3. 3.1.2.3 Operation
    2. 3.2 Keystore
      1. 3.2.1 Overview
      2. 3.2.2 Keystore Usage
        1. 3.2.2.1 Configuration
        2. 3.2.2.2 Setup
        3. 3.2.2.3 Operation
    3. 3.3 SHA2
      1. 3.3.1 SHA Introduction
        1. 3.3.1.1 SHA features
      2. 3.3.2 SHA Performance
      3. 3.3.3 SHA Usage
        1. 3.3.3.1 Configuration
        2. 3.3.3.2 Setup
        3. 3.3.3.3 Operation
    4. 3.4 PKA
      1. 3.4.1 PKA Introduction
        1. 3.4.1.1 PKA features
      2. 3.4.2 PKA Usage
        1. 3.4.2.1 Configuration
        2. 3.4.2.2 Setup
        3. 3.4.2.3 Operation
    5. 3.5 PQC
      1. 3.5.1 ML-DSA
        1. 3.5.1.1 ML-DSA Introduction
        2. 3.5.1.2 ML-DSA Usage
          1. 3.5.1.2.1 Configuration
          2. 3.5.1.2.2 Setup
          3. 3.5.1.2.3 Operation
  7. 4Revision History

2.2 Memory Protection Unit

In the MSPM33C devices an memory protection unit (MPU) is present in the CPUSS. The MPU allows the programmer to define regions of memory as privileged and unprivileged . This acts similar to how the SAU defines regions as secure and non-secure. The key difference is privileged mode changes based on if the device is in thread or handler mode.

Out of reset the device is in thread mode and goes to handler mode if an exception is issued by the processor or peripherals. Exceptions will always be in privilege mode and thread mode the MPU can be used to determine the privilege level. Please see MSPM33C3-Series 160MHz Microcontrollers Technical Reference Manual for more details.