Microprocessor Definition

A microprocessor is a multi-purpose, Programmable, clock driven, register-based electronic device that reads binary instructions from a storage device called memory, accepts binary data as input and processes data according to those instructions and provide results as output.


It is an electronic device that fetches instructions from memory, execute them and provide results. A microprocessor is an electronic device that has computing and decision-making capability.

Nowadays many communication, digital entertainment, portable devices, are controlled by them.


Each microprocessor is designed to execute a specific group of operations. This group of operations is called an instruction set. This instruction set defines what the microprocessor can and cannot do.

Note: A microprocessor cannot perform any task on its own.

The microprocessor can be embedded in a larger system and can function as the CPU of the computer called a microcomputer. A microcomputer consists of microprocessor, memory, input device and output device.

Fig. Block Diagram of Microcomputer


A microcontroller is a programmable device that includes microprocessor, memory and I/O signal lines on a single chip, fabricated using VLSI technology. Microcontrollers are also known as single microcomputers.

  • The microprocessor can be programmed to perform functions on specified/given data by writing specific instructions into its memory.
  • The microprocessor reads one instruction at a time, matches it with its instruction set, and performs the data manipulation specified.
  • The result is either stored back into memory or displayed on an output device.

Basic Units of a Microprocessor

The basic units or blocks of a microprocessor are

  1. ALU (Arithmetic & Logic Unit)
  2. An array of registers
  3. Control unit


The Software is a set of instructions or commands needed for performing a specific task by a programmable device or a computing machine.


The Hardware refers to the components or devices used to form computing machine in which the software can be run and tested. Without software, the Hardware is an idle machine.


A program is a sequence of instructions that bring data into the microprocessor, processes it and sends it out.

Introduction to Microprocessor| MicroController| MicroComputer

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