Operation and Programmer's View

Computer Organization & Embedded System — Hardware–Software Design Issues on Embedded System, NEC licence examination syllabus (Nepal Engineering Council).

Operation and Programmer's View

Same fetch-decode-execute you already know — now framed as an abstraction boundary.

The GPP still runs the standard fetch → decode → execute cycle. What's new here is the idea of the programmer's view: the instruction set (ISA) is the "contract" between hardware and software — a programmer only needs to know the ISA, not the internal wiring, to write correct code.

This abstraction is exactly why the same compiled Android app runs on phones from ten different manufacturers, all with internally different chip designs — as long as they share the same ISA, the software doesn't care what's happening underneath.

💡 One-liner: "Why does the ISA matter for portability?" → Any hardware implementing the same ISA can run the same compiled program, regardless of internal design differences.

Syllabus points

Fetch–decode–execute operation
Programmer's view / instruction set (ISA abstraction)

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