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8085 Program to check for palindrome
Now let us see a program of Intel 8085 Microprocessor. This program will convert ASCII to binary values.
Problem Statement
Write 8085 Assembly language program to check whether a bit pattern is palindrome or not.
Discussion
In this program we are taking the number from location 8000H. The program will return 00H if the number is not palindrome, otherwise it will return FFH.
Let the Input is 18H so the binary value is (0001 1000) this is a palindrome. The number 52H(0101 0010) it is not a palindrome.
In this problem we are taking the first number into accumulator, then shifting it to the left. When it is left shifted the MSb will be placed at LSb and also in the carry flag. This carry flag is inserted into the D register by right shifting. Thus the bit pattern will be reversed, now by checking the values of actual number and the reversed number we can determine it is palindrome or not.
Input
first input
| Address | Data |
|---|---|
| . . . | . . . |
| 8000 | BD |
| . . . | . . . |
second input
| Address | Data |
|---|---|
| . . . | . . . |
| 8000 | 52 |
| . . . | . . . |
third input
| Address | Data |
|---|---|
| . . . | . . . |
| 8000 | 18 |
| . . . | . . . |
Flow Diagram
Program
| Address | HEX Codes | Labels | Mnemonics | Comments |
|---|---|---|---|---|
| F000 | 3A, 00, 80 | LDA 8000H | Load the number into A | |
| F003 | 67 | MOV H, A | Move Acc to H | |
| F004 | 0E, 08 | MVI C,08H | InitializeCounter | |
| F006 | 7C | LOOP | MOV A, H | Load H to Acc |
| F007 | 07 | RLC | Rotate Left | |
| F008 | 67 | MOV H, A | Get back Accto H | |
| F009 | 7A | MOV A, D | Load D content into Acc | |
| F00A | 1F | RAR | Rotate Right through carry | |
| F00B | 57 | MOV D, A | Get back Acc to D | |
| F00C | 0D | DCR C | Decrease C | |
| F00D | C2, 06, F0 | JNZ LOOP | Jump to LOOPif Z = 0 | |
| F010 | 7C | MOV A, H | Load H data to Acc | |
| F011 | BA | CMP D | Compare D with Acc | |
| F012 | CA, 1A, F0 | JZ TRUE | If both are same, it is palindrome | |
| F015 | 3E, 00 | MVI A, 00H | Load 00H intoA | |
| F017 | C3, 1C, F0 | JMP EXIT | Jump to Exit | |
| F01A | 3E, FF | TRUE | MVI A, FFH | Load FFH into A |
| F01C | 32, 50, 80 | EXIT | STA 8050H | Store the result into memory |
| F01F | 76 | HLT | Terminate the program |
Output
first output
| Address | Data |
|---|---|
| . . . | . . . |
| 8050 | FF |
| . . . | . . . |
second output
| Address | Data |
|---|---|
| . . . | . . . |
| 8050 | 00 |
| . . . | . . . |
third output
| Address | Data |
|---|---|
| . . . | . . . |
| 8050 | FF |
| . . . | . . . |
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