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Swap two 16 bits numbers using direct addressing mode

Here, we are going to learn how to swap two 16 bits numbers using direct addressing mode on 8085 Microprocessor?
Submitted by Akash Kumar, on November 03, 2018

Problem statement:

To swap two 16 bits numbers using direct addressing mode on 8085 microprocessor.

Algorithm:

  1. Load the first 16bit number in HL pair register.
  2. Exchange the content of HL pair with DE register.
  3. Now load the second 16bit number in HL pair register.
  4. Exchange the content of HL pair register with DE register.
  5. Now store the content of HL pair at memory location of first number.
  6. Exchange the content of HL pair register with DE register.
  7. Now store the content of HL pair at memory location of second number.
  8. Terminate the program.

Program:

    LHLD 2050
    XCHG
    LHLD 2052	
    XCHG
    SHLD 2050
    XCHG
    SHLD 2052	
    HLT

Observation:

    INPUT: 
    2050:07
    2051:04
    2052:05
    2053:06

    OUTPUT: 
    2050:05
    2051:06
    2052:07
    2053:04

Hence we successfully swapped two 16 bits numbers using direct addressing mode on 8085 microprocessor.






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