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8085 Program to find Square of a number using look up table
Now let us see a program of Intel 8085 Microprocessor. This program is mainly for finding a square of a number.
Problem Statement
Write 8085 Assembly language program to find the square of a number using Look-Up Table.
Discussion
In this example, we are using Look-Up table to find the square of a number. The main limitation of this program is that it can find a square in range 0-F. When the input is above F, it will fail. We are storing the square result into the memory. When the number is greater than F, we are storing FFH into memory to indicate an ERROR.
We are taking the number from location 8000H, and the lookup table is stored at the 9000H location.
The Look Up Table looks like this.
| Number | Squared Value |
|---|---|
| 00 | 00 |
| 01 | 01 |
| 02 | 04 |
| 03 | 09 |
| 04 | 10 |
| 05 | 19 |
| 06 | 24 |
| 07 | 31 |
| 08 | 40 |
| 09 | 51 |
| 0A | 64 |
| 0B | 79 |
| 0C | 90 |
| 0D | A9 |
| 0E | C4 |
| 0F | E1 |
Input
first input
| Address | Data |
|---|---|
| . . . | . . . |
| 8000 | 06 |
| . . . | . . . |
second input
| Address | Data |
|---|---|
| . . . | . . . |
| 8000 | 0C |
| . . . | . . . |
third input
| Address | Data |
|---|---|
| . . . | . . . |
| 8000 | 25 |
| . . . | . . . |
Flow Diagram
Program
| Address | HEXCodes | Labels | Mnemonics | Comments |
|---|---|---|---|---|
| F000 | 21,00, 90 | LXIH, 9000H | Point to the lookup table address | |
| F003 | 3A,00, 80 | LDA 8000H | Get the data | |
| F006 | FE,0F | CPI 0FH | Checkinput > 15D | |
| F008 | DA,13, F0 | JC AFTER | The check the number greater than 0A or not | |
| F00B | 3E, FF | MVIA, FFH | Load FFH into A | |
| F00D | 32,50, 80 | STA 8050H | Store FFH for numbers > 15D | |
| F010 | C3,1B, F0 | JMP DONE | End the program | |
| F013 | 4F | AFTER | MOVC, A | Add the desired Address |
| F014 | 06,00 | MVIB,00H | Clear register B | |
| F016 | 09 | DAD B | ADD BC with HL pair | |
| F017 | 7E | MOVA, M | Take the result from Look-up table | |
| F018 | 32,50, 80 | STA 8050H | Store the result | |
| F01B | 76 | DONE | HLT | Terminate the program |
Output
first output
| Address | Data |
|---|---|
| . . . | . . . |
| 8050 | 24 |
| . . . | . . . |
second output
| Address | Data |
|---|---|
| . . . | . . . |
| 8050 | 90 |
| . . . | . . . |
third output
| Address | Data |
|---|---|
| . . . | . . . |
| 8050 | FF |
| . . . | . . . |
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