ARM Cortex M

ARM Cortex-M is a family of 32-bit microprocessor cores designed for embedded systems. Cortex-M0 (ultra-low-power), M3/M4 (mainstream), M7 (high-performance) span a wide range of power and capability. ARM licenses the architecture; manufacturers (STMicroelectronics, Nordic, NXP, Infineon) build microcontrollers around it. Programming Cortex-M typically involves C (with HAL/drivers) and occasional assembly for performance-critical sections. Real-time constraints demand understanding of interrupts, task scheduling, and hardware registers.