Convert Binary Numbers to Gray Code in 8085

In this program we will see how to find the gray code from an 8-bit number.

Problem Statement

Write 8085 Assembly language program to convert an 8-bit number stored at 8000H to its equivalent gray code. The result will be stored at 8050H.

Discussion

In this program we are converting binary to gray code. The procedure is simple. At first we have to shift the content to the right, then perform XOR operation with the sifted content and the actual content. Thus we will get the gray code. For an example if the number is ABH, then the binary value will be (1010 1011), after shifting the value will be (0101 0101) = 55H, now by XORing ABH and 55H, the result will be (1111 1110) = FEH

Input

first input

Address Data
... ...
8000 AB
... ...

second input

Address Data
... ...
8000 77
... ...


third input

Address Data
... ...
8000 CD
... ...

Flow Diagram

Program

Address HEX Codes Mnemonics Comments
F000 21, 00, 80 LXI H,8000H Point to the source address
F003 7E MOV A, M Take the number from memory to Acc
F004 37 STC Set carry flag
F005 3F CMC Complement carry flag
F006 1F RAR Rotate right Acc content
F007 AE XRA M    XOR memory content with A
F008 32, 50, 80 STA 8050H    Store the gray code
F00B 76 HLT Terminate the program

Output

first input

Address Data
... ...
8050 FE
... ...

second input

Address Data
... ...
8050 4C
... ...

third input

Address Data
... ...
8050 AB
... ...
Updated on: 2019-07-30T22:30:24+05:30

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