The Arm Cortex-M123+ MCU is a microcontroller unit series developed by Arm Holdings, a British semiconductor and software design company. These MCUs are widely used in industrial automation, consumer electronics, and IoT applications, offering high performance, low power consumption, and real-time processing capabilities. The Cortex-M123+ series is part of Arm's Cortex-M family, which serves embedded systems and supports various industries, including automotive, healthcare, and smart devices. Key features often include advanced peripherals, secure firmware, and energy-efficient designs.