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March 12, 2012

Write a program to covert two nibbles into a hexadecimal number (packed number).

Written by @
Apparatus Used: Microprocessor, Keyboards
Assumption: In this program we have to combine two nibble into a hexadecimal number. Let nibble are stored at 2501 and 2502 and we have to store hex number at 2503 H.
Algorithm:
  • Load the MSB of number into accumulator
  • Shift the four bits towards the left
  • Store the shifted information into accumulator
  • Point the next number(LSB) and perform the OR operation with accumulator
  • Store the result
  • End the program
Program:
Memory Add
Mnemonics
Op-code
Comments
2000
LXI
H,2501 H
Initialize memory pointer
2003
MOV
A,M
Move number into accumulator
2004
RLC

Move it to MSB
2005
RLC


2006
RLC


2007
RLC


2008
INX
H
Get LSB of the Number
2009
ORA
M
Perform OR operation
200A
STA
2503 H
Store the result
200D
RST
5
Set Break-point
200E
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.
RLC: Each binary bit of the accumulator is rotated left by one. Bit D7 is placed in the position of D0 as well as carry flag.
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 one.
ORA: Logically OR the contents of register/memory with the accumulator.
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:
2501-04
2502-05
Output:
2503-45

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 (M2501)
  • Press ENTER and Provide your Input at location (2501:04)
  • Press ENTER and Provide your Input at location (2502:05)
  • 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 (M2503) and press ENTER
  • You will get your desired output.

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