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8085 program to swap two 16-bit numbers using Direct addressing mode
In this program we will see how to swap two 16-bit numbers in direct addressing mode.
Problem Statement
Write 8085 Assembly language program to swap two 16-bit number stored at location 8000H – 8001H and 8002H – 8003H using direct addressing mode.
Discussion
Here we are swapping the values using XCHG instruction. This instruction swaps the contents of DE and HL pair contents. We are taking the first number into DE register pair, then the second number into HL pair, then by XCHG we are swapping them.
Input
| Address | Data |
|---|---|
| . . . | . . . |
| 8000 | CD |
| 8001 | AB |
| 8002 | 34 |
| 8003 | 12 |
| . . . | . . . |
Flow Diagram
Program
| Address | HEX Codes | Mnemonics | Comments |
|---|---|---|---|
| F000 | 2A, 00, 80 | LHLD 8000H | Load the first number into HL |
| F003 | EB | XCHG | Exchange DE and HL |
| F004 | 2A, 02, 80 | LHLD 8002H | Load the second number into DE |
| F007 | 22, 00, 80 | SHLD 8000H | Store the second number at first position |
| F00A | EB | XCHG | Exchange the DE and HL |
| F00B | 22, 02, 80 | SHLD 8002H | Store the first number at second position |
| F00E | 76 | HLT | Terminate the program |
Output
| Address | Data |
|---|---|
| . . . | . . . |
| 8000 | 34 |
| 8001 | 12 |
| 8002 | CD |
| 8003 | AB |
| . . . | . . . |
Updated on: 30-Jul-2019
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