Hexadecimal to ASCII conversion | 8085 Lab Program

 Section: Array Operations & Code Conversions

Aim: To write an assembly language program to convert the given Hexadecimal number into its ASCII equivalent and to verify the result.

Apparatus Required: 8085 microprocessor kit, keyboard.

Algorithm:

1. Load the Hexadecimal number from the location.
2. Separate the nibbles.
3. Convert each nibble to its ASCII Equivalent.
4. Add the two converted values.
5. Display the result.
6. Stop.

Program:

Address	Label	Mnemonics	Operand	Comment
4100		LDA	4200	Get the data
4103		MOV	B, A	Move Accumulator content to B reg
4104		ANI	0F	Mask upper nibble
4106		CALL	SUB	Get ASCII code for upper nibble
4109		STA	4201	Store the value of accumulator
410B		MOV	A, B	Move B reg content to Acc
410D		ANI	F0	Mask lower nibble
410F		RLC		Rotate left without carry 4 times
4110		RLC
4111		RLC
4112		RLC
4113		CALL	SUB	Get the ASCII code
4116		STA	4202	Store the accumulator
4119		HLT		Stop
411A	SUB	CPI	0A	Compare with 0A
411C		JC	SKP	Skip if carry
411F		ADI	07	Add 07 to Acc
4121	SKP	ADI	30	Add 30 to Acc
4123		RET		Return

Observation:

• Input:
  • Address 4200: A5
• Output:
  • Address 4201: 35
  • Address 4202: 41

Result: Thus assembly language program to convert the given Hexadecimal number into its ASCII equivalent is completed and also the result is verified.

Flowchart:

               +-------------------------------+
               |             START             |
               +---------------+---------------+
                               |
                               v
               +-------------------------------+
               |  Load the Hexadecimal number  |
               +---------------+---------------+
                               |
                               v
               +-------------------------------+
               |   Convert each nibble into    |
               |       ASCII equivalent        |
               +---------------+---------------+
                               |
                               v
               +-------------------------------+
               |      Display the result       |
               +---------------+---------------+
                               |
                               v
               +-------------------------------+
               |             STOP              |
               +-------------------------------+

Viva Questions:

1. What is ASCII number for 0AH?
2. What is difference between byte and word?
3. What is the immediate addressing mode?
4. What are data transfer instructions?
5. What is the use of immediate addressing mode?
6. What are branching instructions?
7. What is DMA?

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