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February 07, 2012

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

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 and the carry is stored in location 2501 H.
Algorithm:
  • Initialize counter as number of data
  • Initialize pointer as first location of data
  • Clear accumulator
  • Initialize carry
  • Add the first data with accumulator
  • Check for the carry, if not carry then get next number, else get carry
  • Decrement counter
  • Check counter for zero, if not zero then add next number and so on
  • Store output and carry memory location
  • End the Program
Program:
Memory Address
Op-code
Operand
Comments
2000
LDA
2300 H

2003
MOV
C,A
Initialize counter
2004
LXI
H,2301 H
Initialize pointer
2007
MVI
A,00
Clear the accumulator
2009
MVI
B,00
Initialize carry=0
200B
ADD
M
Sum(L)=sum+data
200C
JNC
2010
Check carry
200F
INR
B
Add carry
2010
INX
H
Increment pointer
2011
DCR
C
Decrement counter
2012
JNZ
2009
Check if counter is zero
2015
STA
2500 H
Store sum
2018
MOV
A,B

2019
STA
2501 H
Store carry
201C
RST
5
Set Break-point
201D
END

End the program

Used Instruction:
LDA address: Load data into register A (accumulator) directly from the address given within the instruction.
LXI: This instruction is used to store the 16-bit data in the register pair designated in the operand.
SUB r: This instruction subtract the content of specified register from the contents of accumulator and store result in the accumulator.
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.
JNC: Jump if not carry at specified memory address.
INR: It will increment the content of specified register by one.
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-9A H
           2302 H-52 H
           2303 H-89 H
           2304 H-3E H
Output: 2500-B3 H
            2501-01 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 (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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