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# 8085 program to convert an 8 bit number into Grey number

Prerequisite – Binary to/from Gray Code Problem – Write an assembly language program in 8085 which convert an 8 bit number into grey number Example – Assumption – 8 bit number (input) is stored at memory location 2050 and output to be stored at memory location 3050. Algorithm –

1. Load the content of memory location 2050 in Accumulator
2. Reset carry flag i.e. CY = 0
3. Rotate the contents of Accumulator right by 1 bit with carry and perform xor operation with initial value of input
4. Store the result at memory location 3050

Program –

Explanation –

1. LDA 2050 loads the content of memory location 2050 in accumulator
2. MOV B, A transfers the content of register A in register B
3. STC sets the carry flag i.e. CY becomes 1
4. CMC complements the carry flag i.e. CY becomes 0
5. RAR rotate the content of accumulator by 1 bit along with carry flag
6. XRA B performs the xor operation in values of register A and register B and store the result in A
7. STA 3050 stores the value of accumulator in memory location 3050
8. HLT stops executing the program and halts any further execution

1. Reduced error rate: Gray code can reduce the error rate when transmitting or storing data, since only one bit changes between adjacent values. This can be useful in applications where errors must be minimized, such as in digital communications.

2. Improved accuracy: Gray code can improve the accuracy of position or distance measurements, since small changes in position result in small changes in the Gray code value.

3. Used in digital electronics: Gray code is commonly used in digital electronics, particularly in applications such as rotary encoders or optical sensors.