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March 16, 2012

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

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 2501 H.
Algorithm:
  • Load the length of the array in accumulator
  • Initialize counter
  • Clear accumulator
  • Get first data and add the first data with accumulator
  • Check for carry, if carry generated then Increment register else jump to next data
  • Increment the Pointer
  • Decrement counter
  • Check counter for zero, if not zero then add next number and so on
  • Store output and carry
  • End the Program
Program:
Memory Address
Op-code
Operand
Comments
2000
LDA
2300 H
Load length of array in Accumulator
2003
MOV
C,A
Initialize counter as A
2004
XRA
A
Make sum=0
2005
LXI
H,2301 H
Get first data
2008
MOV
B,A
B make as 0 for store carry
2009
ADD
M
Add first data to accumulator
200A
JNC
200E
If carry is not then jump to 200E
200D
INR
B
If carry, Increment B
200E
INX
H
Increment the Pointer
200F
DCR
C
Decrement counter
2010
JNZ
2009
Check for counter
2013
STA
2500 H
Store output
2016
MOV
A,B
Store carry in accumulator
2017
STA
2501 H
Store the carry
201A
RST
5
Set the Breakpoint
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. 
LDA address: Load data into register A (accumulator) directly from the address given within the instruction. 
XRA: Logically AND the contents of register/memory with 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. 
JNZ: Jump if value of specified register is not zero. 
JNC: Jump if not carry at specified memory address. 
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-89H 
            2304 H-3E H  
Output: 2500-B3 H
             2501-01 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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