An Interrupt Service Routine (ISR) is a special block of code associated with a specific interrupt condition, allowing a system to respond immediately to external or internal events, often in real-time. It temporarily halts the main program execution, executes the necessary response, and then resumes the main program, ensuring efficient and prompt handling of critical tasks.

Interrupt Service Routine

special block of code

specific interrupt condition

System response to events

External Events

internal events

Real-time response refers to the ability of a system or process to react to inputs or changes instantaneously or with minimal delay, ensuring that feedback or actions are provided as events occur. This capability is crucial in environments where timing is critical, such as in live customer service, financial trading, or emergency response systems, to maintain efficiency, accuracy, and user satisfaction.

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