High School Physics

Difference between microprocessor and microcontroller

Last updated on March 7th, 2022 at 03:48 pm

To understand the difference between microprocessor and microcontroller we need to understand what microcomputer system and microcontroller (i.e. single-chip microcomputer system) are.

To make a complete microcomputer system, only a microprocessor is not sufficient. It is necessary to add other peripherals such as read-only memory(ROM), read/write memory(RAM), decoders, drivers, number of input/output devices to make a complete microcomputer system.

In addition,special-purpose devices, such as interrupt controllers, programmable timers, programmable I/O devices, DMA controllers may be added to improve the capability and performance, and flexibility of a microcomputer system.

The key feature of a microprocessor-based computer system is that it is possible to design a system with great flexibility. It is possible to configure a system as a large system or a small system by adding suitable peripherals.

On the other hand, the microcontroller incorporates all the features that are found in the microprocessor. However, it has also added features to make a complete microcomputer system on its own. The microcontroller has built-in ROM, RAM, parallel I/O, serial I/O, counters, and a clock circuit. The microcontroller has on-chip (built-in) peripheral devices. These on-chip peripherals make it possible to have a single-chip microcomputer system. (see figure 1 and figure 2 below)

There are a few more advantages of built-in peripherals:

  • Built-in peripherals have smaller access times hence speed is more.
  • Hardware reduces due to single on-chip microcomputer system.
  • Less hardware reduces PCB size and increases reliability of the system.
figure 1: microprocessor
figure 2: microcontroller

Author of this post

This post is co-authored by Professor Saraswati Saha, who is an assistant professor at RCCIIT, a renowned degree engineering college in India. Professor Saha teaches subjects related to digital electronics & microprocessors.

See also  8086 Instruction Set & Assembly Language Programming

Related Posts

8085 Interrupts with pdf download

8085 – methods of Data Transfer

Peripheral interface IC 8255

microprocessor fundamentals

8085 architecture – MCQ

MCQs on 8085 Instruction set, Addressing Modes & Machine cycles

8085 – program execution

How to Interface a RAM chip with 8085 microprocessor

Functional block diagram of Intel 8085 microprocessor and the functional units

General purpose registers of 8085 microprocessor

Special-purpose registers of 8085 microprocessor – FAQs

Architecture of 8085 microprocessor

Instruction Word flow diagram and Data Word flow diagram for Intel 8085 & 8086

Fetch Cycle, Instruction Cycle, Machine Cycle & T-state of 8085 & 8086 Microprocessor – FAQs

De-Multiplexing of AD0-AD7 in 8085 Microprocessor

Instruction Set and Types of instruction in 8085 microprocessor – FAQs

FAQs on addressing modes of instructions | execution of an instruction in 8085 microprocessor

Arithmetic Instructions in 8085 Microprocessor for Arithmetic operations: Revision notes

8085 Microprocessor – tutorials (hub)

Microprocessor class notes – PDF download

Scroll to top