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February 08, 2012

Write an assembly language program to add two 16 bit numbers, output 16 bit numbers.

Written by @
Apparatus Used: Microprocessor Kit, Keyboard
Assumption: We have to write a program to add two 16 bit numbers. In this case for any 16 bit number, lower byte takes a location and also higher byte take a location, same for the second number and also for output, so we use 6 memory locations for this.
Algorithm:
  • Load First number in H-L Pair
  • Load second number in B-C Pair
  • Add First Number and Second Number
  • Store Output
  • End the Program
Program:
Memory Address
Op-code
Operand
Comments
2000
LXI
H,8050 H
Load 16-bit No. in H-L Pair
2003
LXI
B,123A H
Load 16-bit No. in B-C Pair
2007
DAD
B
Add First Number and 2nd No.
2008
SHLD
2054
Store Output
200B
RST
5
Set Break-point
200C
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.
DAD rp: This instruction adds the contents of the specified register pair to the contents of the HL register pair.
SHLD: The contents of register L are stored in the memory location specified by the 16-bit address in the operand and the contents of register H are stored in the next memory location.
RST 5: This instruction is used to set break-point for the execution.
END: This instruction is used to end the program.
Result:  
Input:
First Number-8050
2nd Number-123A
Output:
2054-8A
2055-92
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 G and Provide Initial address (as 2000)
  • Press SHIFT+4,You will get first screen again
  • Press M and Provide address for output (M2054) and press ENTER
  • You will get your desired output.

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