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The complete software system is divided into

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Answer & Explanation

Correct AnswerD. All of the mentioned

Quick Explanation

An interrupt-driven software system is organized into a main program plus the interrupt service routines required for the subprocesses/peripherals. Since the listed items are constituent parts of the complete software structure, 'all of the mentioned' is correct.

Formula / Key Relation

System software = main/background program + required ISRs

Detailed Explanation

Concept & Reasoning

The main program performs background/control tasks, while interrupt routines execute asynchronously in response to events. Good embedded design keeps ISRs bounded, saves/restores context correctly and coordinates shared state with the main program.

How to Solve It in the Exam

Complete interrupt-driven system → main loop + interrupt routines.

Important Exam Point

Treat each ISR as part of the overall software architecture, not a separate system.

Related Revision Path

This question sits in the revision path Microprocessors and Interfacing → Real-Time Software → Interrupt-Driven Systems .

Main Program and Interrupt Routines explanatory diagram

Quick Trick

Complete interrupt-driven system → main loop + interrupt routines.

Common Mistake

Selecting only the main program and ignoring interrupt service code.

Exam Tip

Treat each ISR as part of the overall software architecture, not a separate system.

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Exam Path

Knowledge Path

Study concept · Main Program and Interrupt Routines →Practice concept Practice topic

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