Experimental verification of 8085

Experiment No-1

Aim

To write an assembly language for adding two 8-bit numbers by using microprocessor kit.

Apparatus required

8085 micro processor kit, ( 0-5V ) DC battery.

Theory

In order to perform addition in 8085, one of the data should be in the accumulator and another data can be in any one of the general purpose register or in the memory. After addition, the sum is stored in .

The sum of two 8-bit data can be either 8-bit ( sum only) or 9-bit ( sum and carry ).

The accumulator can accumulated only the sum and if there is a carry, the 8085 will indicate by setting the carry flag. Here one of the register is used to account for carry.

Algorithm

Step-1         MVI,A

Step-2        Load first data in a register A ( Accumulator )

Step-3        MVI,B

Step-4        Load second data in a register B

Step-5        ADD,B

Step-6        STA,2050h

Step-7        HLT

Assembly Language program

Address         Mnemonics     Op.Codes ( Hex-codes)

 2000                   MVI,A                                  3E

 2001                   30h                                       30

 2002                   MVI,B                                  06

 2003                   20h                                       20

 2004                   ADD,B                                 80

 2005                   STA                                      32

 2006                   50 (Low byte of  M.Add.) 50

 2007                   20 ( High byte of  M.Add) 20

 2008                   HLT                                      76

Results

            Result- 50h

The assembly language program addition of two 8-bit numbers was executed successfully by using 8085 Microprocessor kit.

Experiment No-2

Aim

To write an assembly language for subtracting two 8-bit numbers by using microprocessor kit.

Apparatus required

8085 micro processor kit, ( 0-5V ) DC battery.

Theory

In order to perform subtracting in 8085, one of the data should be in the accumulator and another data can be in any one of the general purpose register or in the memory. After subtraction, the result is stored in accumulator.

Algorithm

Step-1         MVI,A

Step-2        Load first data in a register A ( Accumulator )

Step-3        MVI,B

Step-4        Load second data in a register B

Step-5        SUB,B

Step-6        STA,2050h

Step-7        HLT

Assembly Language program

Address         Mnemonics     Op.Codes ( Hex-codes)

 2000                MVI,A                                  3E

 2001                30h                                       30

 2002                MVI,B                                  06

 2003                20h                                       20

 2004                SUB,B                                  90

 2005                STA                                      32

 2006                50 (Low byte of  M.Add.) 50

 2007                20 ( High byte of  M.Add) 20

 2008                HLT                                      76

Results

            Result- 10h

The assembly language program subtraction of two 8-bit numbers was executed successfully by using 8085 Microprocessor kit.