COMPUTER TUTORIAL
Introduction
Input
Output
Data Storage
Other Components
Quiz

MICROPROCESSOR TUTORIAL
Introduction

CPU STRUCTURE
Introduction
ALU
Control Unit
Register Array
System Bus
Quiz

INSTRUCTION EXECUTION
Introduction
Instruction Sets
Execution Cycle
Fetch Cycle
Decode/Execute Cycles
Execute (Immediate)
Execute (Direct)
Execute (Indirect)
Sample Program
Quiz

FURTHER FEATURES
Introduction
Pipelining
Pipelining Problems
CISC & RISC
Modern Architectures
Quiz
Conclusion

The first part of the instruction execution cycle is the fetch cycle. To best illustrate the actions that occur within the fetch cycle, there is an interactive animation below. The buttons towards the bottom of the animation can be used to control the progress between the steps. When red they are not available to be clicked, but when green they work as outlined below:

Back to first step

Back to previous step

On to next step

Repeat current step

Once the instruction has been fetched and stored in the instruction register, it must then be decoded. The decoding process is detailed on the next page, which can be accessed by clicking the next arrow below.