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, connected embedded and safety-critical 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 reference packages include a pre-verified subsystem and system IP that significantly accelerates the development of secure SoCs with the Cortex-M23 processor.

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

For unlimited design access to this product and other useful Arm IP, visit Arm Flexible Access. Start your project off the right way with the world’s leading SoC design portfolio. This CPU IP is available in Arm Flexible Access at $0.

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 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.