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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