Low-Power Microcontroller with TrustZone Security

The Cortex-M processor series is designed to enable developers to create cost-sensitive and power-constrained solutions for a broad range of devices. Designed to meet the needs of tomorrow’s smart and connected embedded applications, Cortex-M23 is the smallest and lowest-power microcontroller with TrustZone security, making it the ideal processor for applications where software isolation and software security are required.

Features and Benefits
Build on a Secure Foundation

Bringing TrustZone security to even the smallest and lowest-powered devices, the Cortex-M23 processor enables programmers to achieve software isolation easily, and create the security foundation required for modern devices.

 Achieve Longer Battery Life

The Cortex-M23 allows developers to optimize power usage for specific applications with built-in, low-power features. With three highly optimized low-power modes, the processor conserves energy to match processing demands.

Decrease Time to Market

The Arm Corstone foundation IP, integrated with the Cortex-M23 is a pre-verified solution that covers software, hardware, verified IP, evaluation systems and more to accelerate secure SoC design.

Use Cases
Where Innovation and Ideas Come to Life

Energy-harvesting wireless sensor nodes use ambient energy as a power source where batteries or cables are not viable. Superior energy efficiency and the built-in TrustZone security make Cortex-M23 the ideal processor for use in maintenance-free, energy-harvesting IoT nodes and smart sensors.

Get Started with Cortex-M23 Today

Explore the Cortex-M23-based microcontrollers available today for designing secure applications.


The SAM L11 includes TrustZone for Armv8-M and boasts a rich feature set. The MCU series has an extremely low-power consumption, and a new capacitive touch feature with water tolerance and noise immunity.


The M2351 microcontroller brings a new level of trust and security to embedded systems. The MCU combines TrustZone, a secure attribution unit, an implementation-defined attribution unit, flash memory controller, and a security configuration unit.

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Find out why Cortex-M23 is the ideal processor for your size-constrained, low-cost devices that require security.

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Available in Arm Flexible Access

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Related Products and Services
Explore More Options and Features

Corstone-201 Foundation IP

The Arm Corstone-201 foundation IP is an ideal starting point for SoC design. It contains a subsystem and system IP to complement the Cortex-M23 processor and accelerate time to market on a secure foundation.

Corstone-200 Foundation IP

The Arm Corstone-200 foundation IP speeds-up secure SoC design. It contains a subsystem and system IP to complement the latest Cortex-M23 processors to help accelerate the development of a secure SoC.

 Architecture and Technologies
A Foundation of Silicon Success

Arm-based chips, device architectures, and technologies orchestrate the performance of everything that makes modern life possible — from smartphones to agricultural sensors and from medical instruments to servers.