What’s the primary difference you see? All the support devices like Read-only memory, Read-Write memory, Timer, Serial interface, I/O ports are internal. The above block diagram shows a microcontroller system in general. Okay, now let’s take a look at the microcontroller.
The system bus is composed of an address bus, data bus, and control bus.
So one point is clear now, all support devices in a microprocessor-based system are external. All these support devices are interfaced to the microprocessor via a system bus. Take a closer look at the block diagram and you will see a microprocessor that has many support devices like Read-only memory, Read-Write memory, Serial interface, Timer, Input/Output ports, etc. Now, let’s take a closer look at block diagrams of a microprocessor-based system and a microcontroller-based system. These instructions are always fetched from their storage area, which is named as memory. Instructions are electronic instructions represented by a group of bits. Are you clear? Both devices are capable of continuously fetching instructions from memory and keep on executing these instructions as long as the power is not turned off. So let’s begin.Īt the basic level, a microprocessor and micro controller exist for performing some operations – they are – fetching instructions from the memory and executing this instruction (arithmetic or logic operations) and the result of these executions are used to serve to output devices. This comparison will be same (at the basic level) for any microprocessor and controller. In fact, you can call this article a simple comparison of both micro computing devices. When you start learning about Microprocessors (in most cases you will begin with Intel 8085) and Microcontrollers (usually you will begin with Intel 8051 from the MCS 51 micro controller family), the first question that pops up is “hey… what’s the difference in between”? In this article, I am explaining the basic differences and similarities between a microprocessor and microcontroller.
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