The Arm Cortex-M39+ MCU is a microcontroller unit developed by Arm Holdings, a British semiconductor and software design company. It belongs to the Cortex-M series, which is widely used in embedded systems for industries such as industrial automation, automotive, consumer electronics, and IoT. The Cortex-M39+ is designed for high-performance, secure, and energy-efficient applications, featuring advanced security capabilities and real-time processing. Arm's MCUs are licensed to various manufacturers globally, enabling diverse hardware implementations.