8085 program to reverse 16 bit number

MicrocontrollerMicroprocessor8085

In this program we will see how to reverse the digits of a 16-bit number using 8085.

Problem Statement

Write 8085 Assembly language program to reverse a 16-bit number stored at location 8000H-8001H. Also, store the result at 8050H – 8051H.

Discussion

Here the task is too simple. There are some rotating instructions in 8085. The RRC, RLC are used to rotate the Accumulator content to the right and left respectively without carry. We can use either RRC or RLC to perform this task. In the final result each digit of the H and L are reversed, and also the H and L values are reversed. Thus the total reverse operation is done.

Input

Address
Data


8000
AB
8001
CD


Flow Diagram

 

Program

Address
HEX Codes
Labels
Mnemonics
Comments
F000
2A, 00, 80
 
LHLD 8000H
Take the number into HL pair
F003
7D
 
MOV A,L
Load L to A
F004
0F
 
RRC
Rotate right without carry four times
F005
0F
 
RRC
 
F006
0F
 
RRC
 
F007
0F
 
RRC
 
F008
6F
 
MOV L,A
Store reversed number into L again
F009
7C
 
MOV A,H
Load LH to A
F00A
0F
 
RRC
Rotate right without carry four times
F00B
0F
 
RRC
 
F00C
0F
 
RRC
 
F00D
0F
 
RRC
 
F00E
65
 
MOV H,L
Take L to H
F00F
6F
 
MOV L,A
Store reversed number into L
F010
22, 50, 80
 
SHLD 8050H
Store the result at memory
F013
76
 
HLT
Terminate the program

Output

Address
Data


8050
DC
8051
BA


raja
Published on 11-Mar-2019 07:41:02
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