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January 24, 2012

Write a program to multiply 05 by 08 using the technique of repeated addition and store output at external memory 3020H.

Written by @
Apparatus Used: Microprocessor kit, Keyboards
Assumption: Multiplication can be achieved by adding the multiplicand repeatedly as many times as the multiplier. As 05*08
05+05+05+05+05+05+05+05=40
Algorithm:
  • Clear the accumulator.
  • Load 1 Number in Register C.
  • Load Second Number in Register B.
  • Add B into Accumulator.
  • Decrement counter by one.
  • Check counter is zero or not. If counter is not zero repeat addition.
  • Store output at given location.
Program:
Memory Add
Mnemonics
Op-code
Comments
2000
MVI
A, 00 H
Clear the accumulator
2002
MVI
C, 05 H
Multiplier is placed in C
2004
MVI
B, 08 H
Multiplicand placed in B
2006
ADD
B
Add Multiplicand to the Accumulator
2007
DCR
C
Decrement counter by one
2008
JNZ
2005
Repeat until the value of C=0
200B
STA
2052
Store output
200E
RST
5
Set Break-point
200F
END

End the program

Description of used instruction:
MVI: This instruction is used to store 8 bit data in specified register.
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: If result is not zero it will jump to the target 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:
Output: A=05*08=40 (28) H and it will store at external memory 2052H.
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 address for output (M2052) and press ENTER
  • You will get your desired output.

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