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Write a program to multiply a number by two using bit rotation technique.

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Apparatus Used: Microprocessor, Keyboards
Assumption: In this program we have to write a program to multiply a number by two using bit rotation method. This program multiplies a hex number stored in 2050H and store the result at 2051 H using bit rotation technique.
Algorithm:
  • Load the number into accumulator
  • Set the carry flag to zero
  • Rotate accumulator through the carry
  • Store the result
  • End the program
Program:
Memory Add
Mnemonics
Op-code
Comments
2000
LXI
H,2050 H
Set the memory pointer
2003
MOV
A,M
Get the number in accumulator
2004
STC

Set the carry flag to 1
2005
CMC

Complement the carry
2006
RAL

Rotate accumulator left through carry
2007
STA
2051 H
Store the result
200A
RST
5
Set the break point
200B
END

End the Program

Description of used instruction:
LXI: This instruction is used to store the 16-bit data in the register pair designated in the operand.
MOV: This instruction is used to copy the content from source register to destination register.
RAL: Rotate the bits of the accumulator left by one position, through carry
CMC: Complement the carry
STC: Sets the carry
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:
2050-1A
Output:
2051-34

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 (2050:1A)
· 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 (M2051) and press ENTER
· You will get your desired output.

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