8085 program to convert gray to binary

Problem – Write an assembly language program in 8085 microprocessor to convert gray numbers to binary.

Example –



Algorithm –

  1. Load the data from address 2050 in A
  2. Move the data 07 in C
  3. Move the data of A to B
  4. Extract the MSB (Most Significant Bit) of data available in A
  5. Rotate the bits of A to right
  6. Take AND between data in A and 7F
  7. Take XOR between the data present in A and B
  8. Decrements the contents of C
  9. If Zero Flag (ZF) is not set go to step 4 else go to step 9
  10. Store the result at memory address 3050
  11. Stop

Program –

MEMORY ADDRESS MNEMONICS COMMENT
2000 LDA 2050 A <- 2050
2003 MVI C, 07 C <- 07
2005 MOV B, A B <- A
2006 ANI 80 A = A AND 80
2008 RRC Rotate A to Right without carry
2009 ANI 7F A = A AND 7F
200B XRA B A = A XOR B
200C DCR C C = C – 1
200D JNZ 2008 JUMP to 2008 if ZF = 0
2011 STA 3050 3050 <- A
2014 HLT Stop

Explanation–

  1. LDA 2050 is used to load the data from address 2050 in A
  2. MVI C, 07 is used to move the data 07 in C
  3. MOV B, A moves the data of A to B
  4. ANI 80 extracts the MSB(Most Significant Bit) of data available in A
  5. RRC rotates the bits of A to right without carry
  6. ANI 7F is used to tTake AND between data in A and 7F
  7. XRA B takes XOR between the data present in A and B
  8. DCR C is used to decrement the contents of C
  9. JNZ 2008 is used to jump to address 2008 if ZF = 0
  10. STA 3050 is used to store the result at memory address 3050
  11. HLT is used to end the program


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