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8085 program to check whether the given 16 bit number is palindrome or not
In this program, we will see how to check a 16-bit number is a palindrome or not.
Problem Statement
Write the 8085 Assembly language program to check a 16-bit number is palindrome or not. The number is stored at location 8000H and 8001H.
Discussion
A number is a palindrome if the number and its reversed sequence is the number itself. For example, 5225 is a palindrome, but ABCD is not a palindrome.
In this problem, we are taking the number and store it into the HL pair. Then we are performing the reverse operation on L content. If the H and updated L value are the same, then the number is a palindrome. To check that we are doing XOR operation on H and L. When the result is 0, it is a palindrome, otherwise, it is not a palindrome.
If the number is palindrome we are storing FFH at location 8050H, and when it is not palindrome the 00H is stored at 8050H.
Input
| Address | Data |
|---|---|
| … | … |
| 8000 | 25 |
| 8001 | 52 |
| … | … |
Input
| Address | Data |
|---|---|
| … | … |
| 8000 | CD |
| 8001 | AB |
| … | … |
Flow Diagram
Program
| Address | HEX Codes | Labels | Mnemonics | Comments |
|---|---|---|---|---|
| F000 | 2A, 00, 80 | | LHLD 8000H | Take the 16-bit number from memory to HL pair |
| F003 | 7D | | MOV A,L | Take L to A |
| F004 | 0F | | RRC | Rotate Acc four times |
| F005 | 0F | | RRC | |
| F006 | 0F | | RRC | |
| F007 | 0F | | RRC | |
| F008 | AC | | XRA H | XOR Acc and H |
| F009 | 3E, FF | | MVI A,FFH | Load FFH into A |
| F00B | CA, 0F, F0 | | JZ STORE | If Z = 1, jump to store |
| F00E | AF | | XRA A | Otherwise load A = 0 |
| F00F | 32, 50, 80 | STORE | STA 8050H | Store result at 8050H |
| F012 | 67 | | HLT | Terminate the program |
Output
| Address | Data |
|---|---|
| … | … |
| 8050 | FF |
| … | … |
Output
| Address | Data |
|---|---|
| … | … |
| 8050 | 00 |
| … | … |
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