Interrupt Service Routine (ISR) vs. Standard C Function: Key Differences Explained

B. It does not return to the original code execution point unlike a standard function.

This is the key difference between an interrupt service routine (ISR) and a standard function in C. When an interrupt occurs, it triggers an ISR, which interrupts the normal program flow and takes control.

Unlike a standard function that returns to the original code execution point after finishing its task, an ISR does not. Instead, the ISR handles the specific interrupt, performing actions related to the interrupt event. Once the ISR completes its task, the program resumes from where the interrupt occurred.