Application of Absolute Addressing Mode

The absolute addressing mode can be used in interrupt handling to handle interrupt by directly jumping to the ISR address provided in the instruction itself.

Absolute Addressing Mode in 8085 Microprocessor

In absolute addressing mode in the 8085 microprocessor, the effective address is provided directly in the address part of the instruction. The operand can be directly fetched by accessing the effective address. In this article, we will explore the absolute addressing mode and discuss the operations and examples of absolute addressing mode. We will also discuss the advantages, disadvantages and applications of absolute addressing mode in 8085 microprocessors.

Table of Content

  • Absolute Addressing Mode
  • Representation of Instructions
  • Examples
  • LDA Instruction
  • Advantages and Disadvantages
  • Application

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Absolute Addressing Mode in 8085 Microprocessor

The absolute addressing mode is an addressing mode in which the operand is stored in the memory and the effective address is specified in the instruction itself. The effective address is specified directly in the instruction and contains the operand in which any operation is to be performed. The absolute addressing mode is also called the direct addressing mode....

Representation of Instructions in 8085 with Absolute Addressing Mode

The below format specifies the intrusion of 8085 microprocessors with absolute addressing mode....

Examples of Absolute Addressing Mode in 8085 Microprocessor

Some of the examples of absolute addressing mode in 8085 Microprocessor is given below....

LDA Instruction

The LDA instruction is used to load content present in the specified memory address to the accumulator. Suppose we have an instruction LDA 5000H and opcode for LDA instruction is 3A. The address 5000H contains data 5AH and the accumulator contains data 4DH. Then after executing the LDA 3020H instruction the content in the memory address is copied to accumulator....

Advantages and Disadvantages of Absolute Addressing Mode

The advantages and disadvantages of absolute addressing mode are given below....

Application of Absolute Addressing Mode

The absolute addressing mode can be used in interrupt handling to handle interrupt by directly jumping to the ISR address provided in the instruction itself....

Conclusion

From the above discussion we can conclude that the absolute addressing mode in 8085 microprocessors also called as direct mode directly specifies the effective address of the operand within the instruction. It is simple addressing mode in which operand can be fetched easily by accessing the memory only once....

Absolute Addressing Mode in 8085 Microprocessor – FAQs

What are Addressing Modes?...

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