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April 06, 2012

Write an assembly language program to add square to two numbers

Written by @
Aim: Write an assembly language program to evaluate the expression C=A2+B2
Apparatus Used: Microprocessor Kit, Keyboard
Assumption: We have to write a program to evaluate the expression C=A2+B2.  Let assume that Data 1 is A and 2nd Data is B.
Algorithm:
  • Get the first data and Second data
  • Calculate their square using repetitive addition
  • Add the both calculated square
  • Store output at another memory location
Program:
Memory Address
Op-code
Operand
Comments
2000
MVI
B,02 H
Load first data in B
2002
MOV
C,B
Store the first data in C
2003
MVI
D,01 H
Get Second number
2005
MOV
E,D
Store second data in E
2006
XRA
A
Clear accumulator
2007
ADD
B
Add first number and Second
2008
DCR
C
Decrement counter
2009
JNZ
2007
A2  calculated
200C
MOV
H,A
Store content of A into H
200D
XRA
A
Clear accumulator
200E
ADD
D
200F
DCR
E
2010
JNZ
200E
B2 calculated
2013
ADD
H
A2+B2
2014
STA
2200H
Store output at 2200 H
2017
RST
5
Set breakpoint to execution
2018
END
End the program
Used Instruction:
MOV rd,rs: This instruction copies data from the register to destination register.
MVI: This instruction is used to store 8 bit data in specified register. 
ADD: This instruction is used to add the content of specified register to the content of accumulator and store output in accumulator.
DCR: This instruction is used decrement the content of specified register by 1.
JNZ: If result is not zero it will jump to the target address.
XRA: Perform the EX-or operation with accumulator.
STA: This instruction is used to store the content of accumulator at specified memory address.
RST 5: This instruction is used to set breakpoint for the execution.
END: This instruction is used to execute the program.
  
Result:
Output: 2200 H=05 H
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 address for output (M2200) and press ENTER
  •  You will get your desired output.

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