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February 08, 2012

Write an assembly language program to calculate the sum of series of 8-bit numbers, output 8-bit number.

Written by @
Apparatus Used: Microprocessor Kit, Keyboard
Assumption: In this program the length of series is in memory location 2300 H and series itself begins from memory location 2301 H. The result of sum is stored in memory location 2500 H.
Algorithm:
  • Initialize counter as number of data
  • Initialize pointer as first location of data
  • Clear accumulator
  • Get first data and Add the first data with accumulator
  • Decrement counter
  • Check counter for zero, if not zero then add next number and so on
  • Store output
  • End the Program
Program:
Memory Address
Op-code
Operand
Comments
2000
LXI
H,2300 H

2003
MOV
C,M
Initialize counter
2004
MVI
A,00 H
Initialize pointer
2006
INX
H
Get first data
2007
ADD
M
Add first data to accumulator
2008
DCR
C
Decrement counter
2009
JNZ
2006
Check for counter
200A
STA
2500 H
Store output
200D
RST
5

201B
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 1.
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: Jump if value of specified register is not zero.
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: 2300 H-04 H
            2301 H-01 H
            2302 H-02 H
            2303 H-03 H
            2304 H-04 H
Output: 2500-0A 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 Input location for Input (M2300)
  • Press ENTER and Provide your Input at location (2300:04H)
  • Press ENTER and Provide your Input at location (2301:9AH)
  • Press ENTER and provide your Input at location (2302:52H) and so on…
  • 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 (M2500) and press ENTER
  • You will get your desired output.

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