Convert ASCII to HEX using 8085 Program

Now let us see a program of Intel 8085 Microprocessor. This program will convert ASCII to HEXvalues.

Problem Statement

Write 8085 Assembly language program to convert ASCII to Hexadecimal character values. 

Discussion

We know that the ASCII of number 00H is 30H (48D), and ASCII of 09H is39H (57D). So all other numbers are in the range 30H to 39H. The ASCII value of 0AH is 41H (65D) and ASCII of 0FH is 46H (70D), so all other alphabets (B, C, D, E, F) are in the range 41H to 46H.

Here the logic is simple. We are checking whether the ASCII value is less than 58H (ASCII of 9+ 1) When the number is less 58, then it is a numeric value. So we simply subtract 30H from the ASCII value, and when it is greater than58H, then it is alphabetical value. So for that, we are subtracting 37H.

Input

first input

Address Data
. . . . . .
8000 41
. . . . . .

second input

Address Data
. . . . . .
8000 35
. . . . . .

third input

Address Data
. . . . . .
8000 46
. . . . . .

Flow Diagram

Program

Address HEX Codes Labels Mnemonics Comments
F000 21,00, 80


LXIH, 8000H Load address of the number
F003 7E


MOVA, M Load ASCII data to Acc from memory
F004 FE,58


CPI58H Compare with ASCII(9) + 1
F006 D2,0E, F0


JNC NUM The input is numeric
F009 D6,37


SUI 37H Subtract offset to get Alphabetic character
F00B C3,10, F0


JMP STORE Store the result
F00E D6,30 NUM SUI 30H Subtract 30 to get the numeric value
F010 23 STORE INX H Point to next location
F011 77


MOVM, A Store Acc content to memory
F012 76


HLT Terminate the program

Output

first output

Address Data
. . . . . .
8001 0A
. . . . . .

second output

Address Data
. . . . . .
8001 05
. . . . . .

third output

Address Data
. . . . . .
8001 0F
. . . . . .
Updated on: 2020-06-26T10:55:20+05:30

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