Program to convert two-digit hex to two ASCII values in 8085 Microprocessor

8085MicrocontrollerMicroprocessor

Here we will see a program of Intel 8085 Microprocessor. Using this program, we can convert 8-bit numbers to two digit ASCII values.

Problem Statement

 Write an 8085 Assembly language program to convert 8-bit binary to 2-character ASCII values. The 8-bit binary number is stored in memory location 8050H. Separate each nibbles and convert it to corresponding ASCII code and store it to the memory location 8060H and 8061H.

Discussion

In this problem we are using a subroutine to convert one hexadecimal digit (nibble) to its equivalent ASCII values. As the 8-bit number contains two nibbles, so we can execute this subroutine to find ASCII values of them. We can get the lower nibble very easily by masking the upper nibble, and for the upper nibble, we have to mask the lower nibble at first, then rotate the register content dour times to the right to make, now we can change it to ASCII values.

Here we will put 3AH as input, the program will return 33 and 41. These are the ASCII values of 3 and A respectively.

Input

Address
Data


8050
3A


 

Flow Diagram

Program

Address
HEX Codes
Labels
Mnemonics
Comments
8000
31, 00, 81
 
LXI SP, 8100
Initialize SP
8003
21, 50, 80
START
LXI H, 8050H
Initialize pointer with the first location of IN-BUFFER
8006
11, 60, 80
 
LXI D, 8060H
Initialize pointer with the first location of OUT-BUFFER
8009
7E
 
MOV A, M
Move the contents of 8050H to A
800A 
47
 
MOV B, A
Copy A to B
800B 
0F
 
RRC
Rotate accumulator right 4 times
800C 
0F
 
RRC
 
800D 
0F
 
RRC
 
800E 
0F
 
RRC
 
800F 
CD, 1A, 80
 
CALL ASCII
This subroutine converts a binary no. to ASCII
8012
12
 
STAX D
Store the contents of the accumulator specified the contents by DE register pair
8013
13
 
INX D
Go to next location
8014
78
 
MOV A, B
Copy B to A
8015
CD, 1A, 80
 
CALL ASCII
This subroutine converts a binary no. to ASCII
8018
12
 
STAX D
Store the contents of the accumulator specified the contents by DE register pair
8019
76
 
HLT
Terminate the program
801A 
E6, 0F
ASCII
ANI 0FH
Converts a BCD number to its corresponding
ASCII value
+ 48
0 To 9 -----------------à 48 To 57
+ 55
A To F -----------------à 65 To 70
+ 48 + 7
So +48 is common but if the hex digit is
between A to F then +7 is additional.
801C 
FE, 0A
 
CPI 0AH
 
801E 
DA, 23, 80
 
JC CODE
 
8021
C6, 07
 
ADI 07H
 
8023
C6, 30
CODE
ADI 30H
 
8025
C9
 
RET
Returning control to the calling program

 

Output

Address
Data


8060
33
8061
41


raja
Published on 04-Oct-2019 12:32:08
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