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8085 program to swap two 8-bit numbers
In this program we will see how to swap two numbers.
Problem Statement
Write 8085 Assembly language program to swap two 8-bit number stored at location 8000Hand 8001H.
Discussion
In 8085, there is an instruction XCHG. Using this we can swap the contents of DE and HL values. We are taking the numbers and storing them into H and D, then using XCHG the contents are swapped.
Input
| Address | Data |
|---|---|
| . . . | . . . |
| 8000 | CD |
| 8001 | 34 |
| . . . | . . . |
Flow Diagram
Program
| Address | HEX Codes | Mnemonics | Comments |
|---|---|---|---|
| F000 | 3A, 00, 80 | LDA 8000H | Load the first number into A |
| F003 | 67 | MOV H, A | Store the number into H |
| F004 | 3A, 01, 80 | LDA 8001H | Load the second number into A |
| F007 | 57 | MOV D, A | Store the number into D |
| F008 | EB | XCHG | Exchange DE and HL |
| F009 | 7C | MOV A, H | Take H content to A |
| F00A | 32, 00, 80 | STA 8000H | Store the first number after swap |
| F00D | 7A | MOV A, D | Take D content to A |
| F00E | 32, 01, 80 | STA 8001H | Store the second number after swap |
| F011 | 76 | HLT | Terminate the program |
Output
| Address | Data |
|---|---|
| . . . | . . . |
| 8000 | 34 |
| 8001 | CD |
| . . . | . . . |
Updated on: 30-Jul-2019
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