Microprocessor Lecture Series-4||8085 Architecture PART 2||Malayalam Explanation

Introduction

This tutorial provides a comprehensive overview of the internal architecture of the 8085 microprocessor, building on the previous lecture. Understanding the 8085 architecture is crucial for computer engineering students and professionals working with microprocessors. This guide will break down the key components and functions of the 8085, enabling you to grasp its operation effectively.

Step 1: Understand the 8085 Microprocessor Overview

• The 8085 microprocessor is an 8-bit processor with a 16-bit address bus, allowing it to access 64KB of memory.
• It operates at a clock frequency of up to 3 MHz.
• Key components include:
  • Arithmetic Logic Unit (ALU)
  • Register Array
  • Control Unit
  • Instruction Decoder

Step 2: Explore the Internal Architecture Components

ALU

• The ALU performs all arithmetic and logical operations.
• It takes input from registers and outputs results back to registers.

Register Array

• Contains various types of registers:
  • General-purpose registers (A, B, C, D, E, H, L)
  • Special-purpose registers (Program Counter, Stack Pointer)
• General-purpose registers can be used for data manipulation and storage.

Control Unit

• Directs the operation of the processor by coordinating the activities of all internal components.
• It interprets instructions and generates control signals.

Instruction Decoder

• Converts binary instructions into control signals for the ALU and other units.
• Ensures that the correct operation is performed based on the instruction set.

Step 3: Analyze the Addressing Modes

• The 8085 supports several addressing modes, which determine how the operand of an instruction is accessed.
• Common addressing modes include:
  • Immediate addressing
  • Register addressing
  • Direct addressing
  • Indirect addressing
• Understanding these modes is essential for programming the microprocessor effectively.

Step 4: Learn about the Instruction Set

• The 8085 has a rich instruction set that includes:
  • Data transfer instructions
  • Arithmetic instructions
  • Logical instructions
  • Control instructions
• Familiarize yourself with common instructions and their formats to enhance programming skills.

Step 5: Review the Timing and Control Signals

• Timing diagrams are crucial for understanding how operations are timed within the processor.
• Control signals dictate when data is read from or written to memory or I/O devices.
• Recognizing the timing of these signals will help in troubleshooting and designing circuits with the 8085.

Conclusion

The 8085 microprocessor architecture is foundational in understanding microprocessor operations. By mastering its components, addressing modes, instruction set, and control signals, you can effectively program and implement solutions using the 8085. For further learning, consider exploring related topics such as microprocessor interfacing, assembly language programming, or advanced microprocessors.