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Nucleus RTOS

Real-Time OS deployed on more than 3 billion devices

Nucleus® is the first real time operating system integrated with power management features (DVFS, deep sleep modes, and power/clock gating), enabling engineers to take full advantage of the latest power saving technologies in today’s silicon.

A proven, stable, and optimized RTOS, Nucleus is currently deployed on more than 3 billion embedded devices. Using Nucleus, developers can deploy a kernel as small as 2k on a wide selection of hardware including MCU, DSP, FPGA, and MPU.

Key RTOS Features and Benefits

Available Configurations

Nucleus RTOS is available in the following configurations:

Learn More: Nucleus Real Time OS

Hardware Support

Nucleus supports leading embedded architectures, including:

  • ARM
  • ColdFire
  • MicroBlaze
  • MIPS

  • Power
  • SuperH

View all supported hardware

Demonstrations and downloads

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Nucleus Source & Dev Tools


Improving Embedded Systems reliability with a process model based RTOS

White Paper: The introduction of Nucleus Process Model to the Nucleus® Real Time Operating System (RTOS) maintains the key characteristics of an RTOS and adds many of the benefits of a large scale OS, such as dynamic... View White Paper

Measuring RTOS Performance: What? Why? How?

White Paper: In the world of smart phones and tablet PCs memory might be cheap, but in the more constrained universe of deeply embedded devices, it is still a precious resource. This is one of the many reasons why most... View White Paper

Nucleus Communities

Nucleus user forums — discussions, design tips, sample designs and more. Visit

Success Stories

Honeywell chose Nucleus Real Time OS to develop its critical Enhanced Ground Proximity Warning System because of Nucleus' aviation industry reputation for reliability, efficiency, and scalability.

The Nucleus operating system provided Garmin with the full source code and flexible business model they needed to develop the CNX80 Avionics Navigator system.

ZOLL chose Nucleus to build its AED Plus™ automated external defibrillator, based on previous Nucleus design successes and its ability to reduce costs.

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