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8085 program to find bit differences between two binary patterns.
Here we will see how to find the bit differences of two binary patterns using 8085.
Problem Statement
Two binary patterns are stored in locations 8030H and 8031H. Load them in registers A and B. Find out the bit positions where bits are differing and put these location numbers at locations starting from 8050H on words. (Bits are differing at those locations where 0 in A and 1 in B)
Discussion
To solve this problem, we are taking the numbers into A and B. Then initialize the C as counter with 08H, and the register L will keep tract the bit position, where A has 1 and B has 0. By rotating the numbers through carry we can check these criteria. Let us consider we are putting B5H (1011 0101) and E6H (1110 0110), then we can see that the position D1 and D6 are not same. So we are storing 1 and 6 into the memory.
Input
| Address | Data |
|---|---|
| … | … |
| 8030 | B5 |
| 8031 | E6 |
| … | … |
Flow Diagram
Program
| Address | HEX Codes | Labels | Mnemonics | Comments |
|---|---|---|---|---|
| 8000 | 21, 30, 80 | START: | LXI H,8030H | Initialize pointer to the IN-BUFFER |
| 8003 | 11, 50, 80 | | LXI D,8050H | Initialize pointer to the OUT-BUFFER |
| 8006 | 7E | | MOV A, M | Reading DATA from the IN-BUFFER and storing to the Reg. A and B |
| 8007 | 23 | | INX H | |
| 8008 | 46 | | MOV B, M | |
| 8009 | 0E, 08 | | MVI C, 08H | Initialize count by the value 8 |
| 800B | 2E, 00 | | MVI L, 00H | Keep track about the bit position using Reg. L |
| 800D | 1F | LOOP: | RAR | Rotate Accumulator right through carry |
| 800E | DA, 1C, 80 | | JC CHECK | Checking whether the D7 bit is on or off |
| 8011 | 67 | | MOV H, A | Reg. H temporary holds the contents of Reg. A |
| 8012 | 78 | | MOV A, B | The D7 bit of the contents of Reg. B is placed in the carry |
| 8013 | 1F | | RAR | |
| 8014 | 47 | | MOV B, A | Copy A to B |
| 8015 | 7C | DCRM: | MOV A, H | Copy H to A |
| 8016 | 2C | | INR L | Incrementing the bit position by 1 |
| 8017 | 0D | | DCR C | Decrement count until 0 is reached |
| 8018 | C2, 0D, 80 | | JNZ LOOP | |
| 801B | 76 | | HLT | Terminate the Program |
| 801C | 67 | CHECK: | MOV H, A | Reg. H temporary holds the contents of Reg. A |
| 801D | 78 | | MOV A, B | The D7 bit of the contents of Reg. B is placed in the carry |
| 801E | 1F | | RAR | |
| 801F | D2, 26, 80 | | JNC WRITE | Check whether the carry flag is set or not |
| 8022 | 47 | | MOV B, A | Copy A to B |
| 8023 | C3, 15, 80 | | JMP DCRM | Jump unconditionally |
| 8026 | 47 | WRITE | MOV B, A | The matching bit pattern positions are written to the OUT_BUFFER |
| 8027 | 7D | | MOV A, L | |
| 8028 | 12 | | STAX D | |
| 8029 | 13 | | INX D | Go to next location |
| 802A | C3, 15, 80 | | JMP DCRM | Jump unconditionally |
Output
| Address | Data |
|---|---|
| … | … |
| 8050 | 01 |
| 8051 | 06 |
| … | … |
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