Q. Write an 8085 program and draw a flowchart to mask the lower nibble of an 8-bit number.(8085 Microprocessor Program)
Flowchart/Algorithm
Program
| Address | Mnemonics | Operand | Opcode | Comments |
| 2000 | LDA | 3000H | 3A | Load H-L pair with data from 3000H. |
| 2001 | 00 | |||
| 2002 | 30 | |||
| 2003 | ANI | F0H | E6 | AND Immediate F0H with reg. A. |
| 2004 | F0 | Immediate value F0H. | ||
| 2005 | STA | 3001H | 32 | Store the result at memory location 3001H. |
| 2006 | 01 | |||
| 2007 | 30 | |||
| 2008 | HLT | 76 | Halt |
Output
Before Execution:
3000H: 45H
After Execution:
3001H: 40H
Program Explanation
- This program masks the lower nibble of an 8-bit number stored in memory location 3000H.
- Let us assume that the operand stored at memory location 3000H is 45H.
- The operand is moved to accumulator from memory location 3000H.
- Then, AND operation of F0H is performed with the accumulator. This results in the masking of the lower nibble.
- The result is stored at memory location 3001H.
