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January 04, 2012

Write an assembly language program to subtract two 8 bit numbers, output 8 bit number using memory location.

Written by @
Apparatus Used: Microprocessor Kit, Keyboard
Assumption: We have to write a program to subtract two 8 bit numbers which are stored at different memory location and output should 8 bit number and output should be store at another memory location.
Algorithm:
  • Initialize memory pointer
  • Move First Number into Accumulator
  • Get second Number using memory location
  • Now subtract first number and second number
  • Store output at another memory location
Program:
Memory Address
Op-code
Operand
Comments
2000
LXI
H,2050 H
Load  first number at 2050 H

2003
MOV
A,M
Move the first number into A

2004
INX
H
Get Second number

2005
SUB
M
Add first number and Second

2006
STA
2052 H
Store output at 2052

2009
RST
5
Set Break-point to execution

200A
END

End the Program







Used Instruction:
LXI: This instruction is used to store the 16-bit data in the register pair designated in the operand.
MOV rd,rs: This instruction copies data from the source register into destination register.
INX: This instruction is used to increment the content of register pair by one.
SUB: This instruction is used for subtract the content of specified register from accumulator and store output in accumulator.
STA: This instruction is used to store the content of accumulator at specified memory address.
RST 5: This instruction is used to set break point for the execution.
END: This instruction is used to execute the program.
Result
Input: 2050-08
            2051-05
Output: 2052-08-05=03             
Procedure to look output
  • After press ENTER, You will get first screen
  • Press G and Provide Initial address (as 2000)
  • Press SHIFT+4,You will get first screen again
  • Press M and Provide Input location for Input (M2050)
  • Press ENTER and Provide your Input at location (2050: 08)
  • Press ENTER and Provide your Second Input (2051 :05)
  • Press SHIFT+4
  • Press G and Provide Initial address (as 2000)
  • Press SHIFT+4,You will get first screen again
  • Press M and Provide address for output (M2052) and press ENTER
  • You will get your desired output.

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