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January 11, 2012

Write an assembly language program t0 decimal addition for two 8 bit numbers, output more than 8 bit number using memory location. (Carry)

Written by @
Apparatus Used: Microprocessor Kit, Keyboard
Assumption: We have to write a program to add two 8 bit numbers which are stored at different memory location and output should be more than 8 bit number and output should be store at another memory location. Output will be in decimal.
Algorithm:
  • Initialize memory pointer
  • Move First Number into Accumulator
  • Get second Number using memory location
  • Now add first number and second number
  • Convert hexadecimal value into decimal
  • Check for the carry
  • Store the carry at memory location
  • Store output at another memory location
  • End the Program
Program:
Memory Address
Op-code
Operand
Comments
2000
LXI
H,2050 H
Load  first number at 2050 H
2003
MVI
C,00 H
Initialize C for the carry
2005
MOV
A,M
Move the first number into A
2006
INX
H
Get Second number
2007
ADD
M
Add first number and Second
2008
DAA

Decimal adjust accumulator
2009
JNC
200D
Check Carry
200C
INR
C
Increment C if there is carry
200D
STA
2052 H
Store output at 2052
2010
MOV
A,C
Store Carry in A
2011
STA
2053
Store carry at 2053
2014
RST
5
Set Break-point
2015
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.
MVI: This instruction is used to store 8 bit data in specified register.
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 register pair by one.
ADD: This instruction is used to add the content of specified register to the content of accumulator and store output in accumulator.
DAA: If the value of low order four bits in the accumulator is greater then 9 or if auxiliary carry flag is set, the instruction adds 6 to the low order four bits. If the value of high order four bits in the accumulator is greater then 9 or if auxiliary carry flag is set, the instruction adds 6 to the high order four bits
JNC: Jump if not carry at specified memory address.
INR: It will increment the content of specified register 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: 2050-45
            2051-55
Output: 2052-00 H
             2053-01 H (carry)             
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: 45)
  • Press ENTER and Provide your Second Input (2051 :55)
  • 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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