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