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Simulate decimal up counter in 8085 Microprocessor
Here we will see one 8085 Microprocessor program. In this program we will see how to simulate the decimal up counter.
Problem Statement−
Write an 8085 Assembly language program to simulate the decimal up counter. That will count from 0 through 9. Then come back to 0 again.
Discussion−
In this section we are simulating the decimal up counter. Here the counter will count 100 decimal numbers from 0 to 99. All values will be updated in each 0.5 seconds. For decimal count we are using the DAA instruction.
Note: Here for simplicity we are storing the numbers into memory. To simulate it like a counter we can use 7-segment display to show the numbers
Input
Here we are not providing any input.
Flow Diagram
Program
| Address | HEX Codes | Labels | Mnemonics | Comments |
|---|---|---|---|---|
| F000 | AF | | XRA A | Initialize A with 00H |
| F001 | 32, 00, 80 | LOOP | STA 8000H | Store A into 8000H |
| F004 | CD, 10, F0 | | CALL DELAY | Wait for 0.5 second |
| F007 | 3A, 00, 80 | | LDA 8000H | Get back the data from 8000H |
| F00A | C6, 01 | | ADI 01H | Add 01H with the number |
| F00C | 27 | | DAA | Decimal adjust |
| F00D | C3, 01, F0 | | JMP LOOP | Jump to LOOP |
| F010 | 01, FF, FF | DELAY | LXI B,FFFFH | Initialize BC register pair to FFFFH |
| F013 | 0B | L1 | DCX B | Decrease BC |
| F014 | 78 | | MOV A,B | Take B to A |
| F015 | B1 | | ORA C | OR C and E |
| F016 | C2, 13, F0 | | JNZ L1 | If Z = 0, jump to L1 |
| F014 | C9 | | RET | Return from subroutine |
Output
The numbers are storing into memory location 8000H.
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