8085 Program to Check the Fourth Bit of a Byte

In this program, we will see how to check the 4th bit of an 8-bit number.

Problem Statement

Write 8085 Assembly language program to check whether the fourth bit of a byte is 0 or 1.When it is 0, store 00H at any specified location, and when it is 1, store FFH at the specified location.

Discussion

We are considering the 8-bit number, and storing 00H or FFH by checking the 4th bit on the number from left. 

The logic behind it is very simple. We are just performing bit-wise and operation on the given data with 08H. If the result is non-zero, then the 4th bit is 1, otherwise, it is 0.

Input

first input

Address
 Data
.
.
.
 .
.
.
8000
 AF
.
.
.
 .
.
.


second input

Address
 Data
.
.
.
 .
.
.
8000
 B3
.
.
.
 .
.
.




Flow Diagram

Program

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


LXI H,8000H
 Load address to get data
F003
 7E


MOV A, M
 Load memory content to Acc
F004
 21, 50, 80


LXI H,8050H
 Load the destination address
F007
 E6, 08


ANI 08H
 AND acc with 0000 1000
F009
 C2,11, F0


JNZ N ONZ
 When Z flag is set, save 00H
F00C
 36,00


MVI M, 00H
 Save FFH when Z is not set
F00E
 C3,13, F0


JMP END
 Jump to stop the program
F011
 36, FF
 NONZ
 MVI M, FFH
 Save 00H
F013
 76
 END
 HLT
 Terminate the program


Output

first output

Address
 Data
.
.
.
 .
.
.
8050
 FF
.
.
.
 .
.
.

second output

Address
 Data
.
.
.
 .
.
.
8050
 00
.
.
.
 .
.
.


Updated on: 2020-06-27T14:02:42+05:30

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