Lesson Notes By Weeks and Term v4 - SHS 1

Lesson Video

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Performance objectives

• Describe the characteristics of CISC, RISC, and ARISC architectures.
• Compare the advantages and disadvantages of CISC and RISC.
• Identify real-world examples of devices using these architectures.
• Propose improvements to existing products using embedded systems.

Lesson summary

Welcome, future engineers! Look around you. Your smartphone, the digital TV in your living room, the ECG prepaid meter, and even the traffic lights in our cities all have a small, powerful "brain" inside them. These are called embedded systems. Today, we are going to learn about the fundamental design philosophy of these brains—their *architecture*. Understanding these architectures (CISC, RISC, and ARISC) is like understanding the difference between a master chef who can cook a whole complex meal from one command, and a team of specialist cooks who each do one simple thing very fast.

Lesson notes

A. Introduction: What is a Computer Architecture?

Before we discuss CISC and RISC, we need to understand what we are talking about. Microprocessor (CPU): This is the "brain" of any computer or electronic device. It performs calculations and executes commands. Instruction: A single command that the microprocessor can understand and execute. Examples: `ADD`, `SUBTRACT`, `LOAD`, `STORE`. Instruction Set Architecture (ISA): This is the complete collection of all the instructions that a specific microprocessor can execute. It is the "vocabulary" or "language" of the processor.

Analogy: Think of a chef in a kitchen. The Chef is the Microprocessor. An Instruction is a single command you give the chef, like "Chop onions" or "Fry chicken". The Instruction Set Architecture (ISA) is the entire recipe book the chef has memorized. It contains every single command they understand.

The way this "recipe book" is designed is what leads us to different architectures. Some recipe books have very complex recipes, while others only have very simple, basic steps. B. CISC: Complex Instruction Set Computer

Evaluation guide

• Describe the CISC, RISC and ARISC architectures.
• Initiating Talk for Learning: The facilitator initiates a discussion by introducing embedded systems,
• their evolution over time, features, application areas and some limitations. Learners cite some electronic
• products within their environment, discuss the role of embedded systems within them and also propose