8085 Program to Swap two 8 bit numbers using Direct addressing mode - CodeTextPro

 8085 program to swap two 8 bit numbers using Direct addressing mode

Problem – Write a program to swap two 8-bit numbers using direct addressing mode where starting address is 2000 and the first 8-bit number is stored at 3000 and the second 8-bit number is stored at 3001 memory address.

Example –

Algorithm –

1. Load a 8-bit number from memory 3000 into accumulator

2. Move value of accumulator into register H

3. Load a 8-bit number from memory 3001 into accumulator

4. Move value of accumulator into register D

5. Exchange both the register pairs

6. Stop

Explanation – Registers A, H, D are used for general purpose.

1. LDA is used to load accumulator direct using 16-bit address (3 Byte instruction)

2. MOV is used to transfer the data (1 Byte instruction)

3. XCHG is used to exchange the data of both the register pair (H-L), (D-E) (1 Byte instruction)

4. HLT is used to halt the program.