Lesson Notes By Weeks and Term v4 - SHS 1
EMBEDDED SYSTEMS
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EMBEDDED SYSTEMS
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Subject: Engineering
Class: SHS 1
Term: 2nd Term
Week: 15
Grade code: 1.4.2.LI.3
Strand code: 4
Sub-strand code: 2
Content standard code: 1.4.2.CS.1
Indicator code: 1.4.2.LI.3
Theme: AUTOMATION AND EMBEDDED SYSTEMS
Subtheme: EMBEDDED SYSTEMS
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Welcome, future engineers! Look around you. Your phone, the digital TV in the living room, the prepaid electricity meter on the wall, and even the microwave oven in the kitchen all have a small, powerful "brain" inside them. This brain is an embedded system, a mini-computer designed for a specific job. Today, we are going to look deep inside these brains. We will learn about the fundamental design philosophy, or architecture, of the processors that run them. Just like you can build a house in different ways (with big, complex pre-made walls or with small, simple individual blocks), processors can be designed in different ways.
A. What is an Instruction Set Architecture (ISA)?
Think of a processor (the CPU or "brain") as a very skilled worker who only understands a specific language. The list of all the words (commands or instructions) that this worker understands is its Instruction Set Architecture (ISA). An instruction is a basic command given to the processor, like `ADD`, `SUBTRACT`, or `MOVE DATA`. The ISA is the complete vocabulary and grammar of the processor. It defines everything the processor can do.
Different types of processors speak different languages. We are going to learn about two major language families: CISC and RISC. B. CISC: The Complex Instruction Set Computer
Imagine you have a master carpenter. You can give him one complex command: "Build me a chair." He knows exactly what to do: get the wood, measure it, cut it, join the pieces, sand it, and varnish it. He does everything with just that one command. This is the philosophy of CISC.