This is the MCU’s ability to pause its current task to handle an urgent event (like a sensor trigger) before returning to its main loop. Understanding the Interrupt Service Routine (ISR) is a rite of passage for every beginner.
For a beginner, the most critical concept is the . Registers are small, high-speed storage locations within the MCU that control its behavior. In Embedded C, programming often involves "bit-flipping"—setting a specific bit in a register to 1 to turn on an LED or to 0 to stop a motor.
The Bridge Between Code and Hardware: An Introduction to Embedded C