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February 06, 2012

Write an assembly language program to convert from Gray Code to Binary Code.

Written by @
Apparatus Used: Microprocessor Kit, Keyboard
Assumption: We have to write a program to convert Grey code to Binary code. Suppose a number stored at 2050 H and we have to store converted Binary code at 2051 H.
Algorithm:
  • Load data at input location
  • Store that number in register B
  • Set counter as number of bit
  • Decrement counter
  • Jump if zero at no operation
  • Set carry flag
  • Complement of carry flag
  • Rotate accumulator right through carry
  • XOR specified register with accumulator
  • Jump unconditionally at decrement counter
  • Store output at memory location
  • End the Program
Program:
Memory Address
Op-code
Operand
Comments
2000
LXI
H,2050 H
Get data at this location
2003
MOV
A,M
Store data in accumulator
2004
MOV
B,A
Store data in register B
2005
MVI
C,08
Number of Bit
2007
DCR
C
Decrement bit by 1
2008
JZ
2012
Jump if zero at No operation
200B
STC

Set the carry flag
200C
CMC

Complement carry
200D
RAR

Rotate accumulator right
200E
XRA
B
XOR with register
200F
JMP
2007
Jump unconditionally to addr.
2012
NOP

No operation
2013
STA
2051 H
Store the result
2016
RST
5
Set Break-point(optional)
2017
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.
MVI: This instruction is used to store 8 bit data in specified register.
DCR: This instruction is used decrement the content of specified register by 1.
JZ: Jump if counter is Zero
STC: This instruction set carry flag equal to 1
CMC: This instruction complements the carry flag.
RAR: This instruction moves the content of the accumulator right by one position through the carry. Bit D7 placed in CY and CY is placed in D7.
XRA: This instruction logically XORs the contents of the specified register with content of accumulator and stores the result in the accumulator.
MOV: This instruction is used to copy the content from source register to destination register.
JMP: This instruction jump unconditionally at specified address.
NOP: No operation
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 H-58 (Grey)           
Output: 2051 H- 6F (Binary)             
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 (2050:58)
  • 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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