Introduction to microprocessor

What you will learn

Microprocessor Introduction

Concept of address and data

Architecture of 8086 microprocessor

8086 PSW

8086 pin diagram


Brief information of microprocessor. A microprocessor is basically the brain of the computer. We can also call it simply a processor or CPU. Furthermore, a microprocessor is basically a computer processor that is mounted on a single IC (Integrated Circuit). It means that all the functions of the processor are included on a single chip.

8086 Microprocessor is an enhanced version of 8085Microprocessor that was designed by Intel in 1976. It is a 16-bit Microprocessor having 20 address lines and 16 data lines that provides up to 1MB storage. It consists of powerful instruction set, which provides operations like multiplication and division easily.

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It supports two modes of operation, i.e. Maximum mode and Minimum mode. Maximum mode is suitable for system having multiple processors and Minimum mode is suitable for system having a single processor.

The most prominent features of a 8086 microprocessor are as follows −

  • It has an instruction queue, which is capable of storing six instruction bytes from the memory resulting in faster processing.
  • It was the first 16-bit processor having 16-bit ALU, 16-bit registers, internal data bus, and 16-bit external data bus resulting in faster processing.
  • It is available in 3 versions based on the frequency of operation −
    • 8086 → 5MHz
    • 8086-2 → 8MHz
    • (c)8086-1 → 10 MHz



Concept of address and data bus
Architecture of 8086
Processor Status Word of (Flags) of 8086 microprocessor
8086 pin diagram part 1
8086 pin diagram part 2