CPU as the brain of the computer in Intro to Computing - Flowchart & Logic Diagram

Process Overview

The CPU (Central Processing Unit) acts like the brain of the computer. It follows a simple cycle: it fetches instructions from memory, decodes what to do, and then executes those instructions. This cycle repeats continuously to run programs.

Flowchart

Fetch Instruction

↓

Decode Instruction

↓

Execute Instruction

↩(Back to (End)

This flowchart shows the CPU's basic cycle: fetching an instruction from memory, decoding it to understand the task, executing the task, and then checking if there are more instructions to process. If yes, it repeats; if no, it stops.

Step-by-Step Trace - 5 Steps

Step 1: CPU fetches the first instruction from memory address 0x0010.

Step 2: CPU decodes the instruction to understand it needs to add 5 to register A.

Step 3: CPU executes the addition, updating register A's value.

Step 4: CPU checks if there are more instructions to process.

Step 5: CPU fetches the next instruction from memory address 0x0011.

Diagram

 +---------------------+
 |      Memory         |
 | +-----------------+ |
 | | Instruction 1   |<----+
 | | Instruction 2   |     |
 | +-----------------+     |
 +---------------------+   |
                           |
 +---------------------+   |
 |        CPU          |   |
 | +-----------------+ |   |
 | | Fetch Unit      | |---+
 | | Decode Unit     | |   |
 | | Execute Unit    | |   |
 | +-----------------+ |   |
 +---------------------+   |
                           |
 +---------------------+   |
 |      Registers      |<--+
 +---------------------+

This diagram shows the CPU connected to memory and registers. The CPU fetches instructions from memory, decodes and executes them, and uses registers to store temporary data during processing.

Flowchart Quiz - 3 Questions

What is the first step the CPU performs in its cycle?

A Fetch the instruction from memory

B Execute the instruction

C Decode the instruction

D Store data in registers

Key Result

The CPU continuously fetches, decodes, and executes instructions, acting like the brain that controls all computer operations.