Decimal to Hexadecimal conversion | 8085 Lab Program

 Section: Array Operations & Code Conversions

Aim: To convert a given decimal number to hexadecimal number.

Apparatus Required: 8085 microprocessor kit, key board.

Algorithm:

1. Initialize the memory location to the data pointer.
2. Increment B register.
3. Increment accumulator by 1 and adjust it to decimal every time.
4. Compare the given decimal number with accumulator value.
5. When both matches, the equivalent hexadecimal value is in B register.
6. Store the resultant in memory location.

Program:

Address	Label	Mnemonics	Operand	Comment
4100		LXI	H, 4200	Initialize HL reg. to 4200H
4103		MVI	A, 00	Initialize A register
4105		MVI	B, 00	Initialize B register
4107	LOOP	INR	B	Increment B reg.
4108		ADI	01	Increment A reg
410A		DAA		Decimal Adjust Accumulator
410B		CMP	M	Compare M & A
410C		JNZ	LOOP	If acc and given number are not equal, then go to LOOP
410F		MOV	A, B	Transfer B reg to acc
4110		STA	4201	Store the result in a memory location
4113		HLT		Stop the program

Observation:

• Input: Address 4200: 21
• Output: Address 4201: 15

Result: Thus an ALP program for conversion of decimal to hexadecimal was written and executed.

Flowchart:

               +-------------------+
               |       START       |
               +---------+---------+
                         |
                         v
               +-------------------+
               |   [HL] <- 4200H   |
               +---------+---------+
                         |
                         v
               +-------------------+
               |    [A] <- 00H     |
               +---------+---------+
                         |
                         v
               +-------------------+
               |    [B] <- 00H     |
               +---------+---------+
                         |
                         v <------------------+
               +-------------------+          |
               |   [B] <- [B] + 1  |          |
               +---------+---------+          |
                         |                    |
                         v                    |
               +-------------------+          |
               |   [A] <- [A] + 1  |          |
               +---------+---------+          |
                         |                    |
                         v                    |
               +-------------------+          |
               |   Decimal Adjust  |          |
               |    Accumulator    |          |
               +---------+---------+          |
                         |                    |
                         v                    |
                       /   \                  |
                     /  Is   \                |
                   /   [A] =   \              |
                  <    [M]?     >             |
                   \           /              |
                     \       /                |
                       \   /                  |
                        |                     |
            +-----------+------------+        |
            |                        |        |
           YES                       NO       |
            |                        +--------+
            v
  +-------------------+
  |    [A] <- [B]     |
  +---------+---------+
            |
            v
  +-------------------+
  |     <- [A]  |
  +---------+---------+
            |
            v
  +-------------------+
  |       STOP        |
  +-------------------+

Viva Questions:

1. What is meant by ADI instruction?
2. What is the function of DAA instruction?
3. What is the function of XCHG instruction?
4. How you can load 16-bit data in 8500H and 8501H memory locations?
5. What is the difference between LHLD and SHLD instructions?
6. What is physical address?
7. Define OFFSET address.

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