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The Cortex Microcontroller Software Interface Standard

The Cortex Microcontroller Software Interface Standard (CMSIS) simplifies software development by enabling the reuse of template code and the combination of CMSIS-compliant software components from various middleware vendors. Vendors can expand the CMSIS to include their peripheral definitions and access functions for those peripherals.

For a Cortex®‑M33 microcontroller system, the CMSIS defines:

  • A common way to:

    • Access peripheral registers.

    • Define exception vectors.
  • The names of:

    • The registers of the core peripherals.

    • The core exception vectors.
  • A device-independent interface for RTOS kernels, including a debug channel.

The CMSIS includes address definitions and data structures for the core peripherals in the Cortex‑M33 processor.

This document includes the register names defined by the CMSIS, and short descriptions of the CMSIS functions that address the processor core and the core peripherals.


This document uses the register short names that are defined by the CMSIS. In a few cases these short names differ from the architectural short names that might be used in other documents.
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