8085 program to generate Fibonacci sequence

In this program we will see how to generate Fibonacci sequence.

Problem Statement

Write 8085 Assembly language program to generate the first ten elements of the Fibonacci sequence using registers only and store them in memory locations 8050H to 8059H. 

Discussion

This program will generate the Fibonacci numbers. The Fibonacci numbers follows this relation F(i) = F(i - 1) + F(i - 2) for all i >2 with F(1) = 0, F(2) = 1.

Input

In this case we are not providing any input, this program will generate ten Fibonacci numbers.

Flow Diagram

Program

Address HEX Codes Labels Mnemonics Comments
8000 21, 50, 80 START LXI H 8050H  Pointer to the OUT-BUFFER
8003 AF
XRA A  Clear accumulator and reg. B
8004 47
MOV B, A 
8005 77
MOV M, A  Copying content to the target location
8006 3C
INR A  Increment A
8007 23
INX H  Go to the next dest. address.
8008 77
MOV M, A  Moving the content
80 09  0E, 08
MVI C, 08H  Initialize counter
800B  80 LOOP ADD B  Getting the next term
800C  46
MOV B, M  Initializing term e.g. F1 = F2
800D  23
INX H  Go to the next dest. address.
800E  77
MOV M, A  Writing to the OUT-BUFFER
800F  0D
DCR C  Decrement count until 0 is reached F3= F1 + F2 (A) = (A) + (B) This is done with instruction ADDB.
8010 C2, 0B, 80
JNZ LOOP 
8013 76
HLT  Terminate the program


Output

Address Data
... ...
8050 00
8051 01
8052 01
8053 02
8054 03
8055 05
8056 08
8057 0D
8058 15
8059 22
... ...
Updated on: 2019-07-30T22:30:24+05:30

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