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February 26, 2012

Write an assembly language program to convert ASCII character into hexadecimal number.

Written by @
Apparatus Used: Microprocessor Kit, Keyboard
Assumption: We have to write a program such that it can convert any given ASCII character into hexadecimal number. As Hex code for 31 is 0B.
Algorithm:
  • Load the data into accumulator
  • Subtract 30 H from the accumulator
  • Compare the content of accumulator with 0A H.
  • If A< 0A H, Jump to address otherwise proceed next step.
  • Subtract 07 H from the accumulator
  • Store the result at memory location.
  • End the Program
Program:
Memory Address
Op-code
Operand
Comments
2000
LDA
2500 H
Memory pointer Initialization
2003
SUI
30 H
Subtract 30 from A
2005
CPI
0A H
Compare with Accumulator
2007
JC
200C
Check for carry
200A
SUI
07 H
Subtract 07 from A
200C
STA
2501 H
Store output at location
200F
RST
5
Set Break-point
2010
END

End the program

Used Instruction:
LDA address: Load data into register A (accumulator) directly from the address given within the instruction.
SUI: This instruction is used to subtract the given content from the content of accumulator and store output in accumulator.
CPI: Compare 8-bit data with the content of accumulator.
JC: Jump if 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:
2500-31
Output:
2051-0B 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 (M2500)
  • Press ENTER and Provide your Input at location (2500:31)
  • 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 (M2501) and press ENTER
  • You will get your desired output.

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