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January 17, 2012

Write an assembly language program to swap content of memory location.

Written by @
Apparatus Used: Microprocessor Kit, Keyboard
Assumption: We have to write a program to exchange the content between memory locations. Suppose 10 is store at 2050 and 11 is at 2051 then output should be 11 at 2050 and 10 should be at 2051.
Algorithm:
  • Get First Number and store it in accumulator
  • Get second Number
  • Store it in another register C
  • Now store first number at 2051
  • Get 2nd Number in accumulator ant store it at 2050.
  • End the Program
Program:
Memory Address
Op-code
Operand
Comments
2000
LXI
H,2050 H
Store First Number
2003
MOV
A,M
First Number in Accumulator
2004
INX
H
Get the 2nd number
2005
MOV
C,M
Store 2nd Number in C
2006
STA
2051
Store First Number at 2051
2009
MOV
A,C
Move number in accumulator
200A
STA
2050
Store 2nd  number at 2050
200D
RST
5
Set Break-point
200E
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: This instruction is used to copy the content from source register to destination register.
INX: This instruction is used to increment the content of specified register pair by one.
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: 2050-10, 2051-11
Output: 2050-11, 2051-10
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 (2050:10)
  • Press ENTER and Provide your Input at location (2051:11)
  • 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 (M2050) and press ENTER
  • You will get your desired output.

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