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8085 program to sum of two 8 bit numbers without carry
Here we will see how to add two 8-bit numbers without carry in 8085.
Problem Statement
Write 8085 Assembly language program to perform 8-bit addition without carry. The numbers are stored at F100, and F101. Result will be stored at F102.
Discussion
In 8085, there is ADD instruction to add two numbers. We will set the HL pair to point the numbers, then load accumulator with the number. Then add with ADD M operation which can add items from memory pointed by HL pair and accumulator.
Input
| Address | Data |
|---|---|
| … | … |
| F100 | CE |
| F101 | 21 |
| … | … |
Flow Diagram
Program
| Address | HEX Codes | Labels | Mnemonics | Comments |
|---|---|---|---|---|
| F000 | 21, 01, F1 | | LXI H,F100H | Point to get the numbers |
| F003 | 7E | | MOV A,M | Load first number to A |
| F004 | 23 | | INX H | Point to next operand |
| F005 | 86 | | ADD M | Add M with A |
| F006 | 23 | | INX H | Point to next location |
| F007 | 77 | | MOV M,A | Store result |
| F008 | 76 | | HLT | Terminate the program |
Output
| Address | Data |
|---|---|
| … | … |
| F102 | EF |
| … | … |
Updated on: 30-Jul-2019
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