8085 Program to Multiply two 8 bits numbers

In this program, we will see how to multiply two 8-bit numbers using 8085 microprocessor.

Problem Statement

Write 8085 Assembly language program to multiply two 8-bit numbers stored in a memory location and store the 16-bit results into the memory.

The 8085 has no multiplication operation. To get the result of multiplication, we should use the repetitive addition method.

After multiplying two8-bit numbers it may generate 1-byte or 2-byte numbers, so we are using two registers to hold the result.

We are saving the data at location 8000H and 8001H. The result is storing at location 8050H and 8051H.

Address	HEX Codes	Labels	Mnemonics	Comments
F000	21,00, 80		LXIH,8000H	Load first operand address
F003	46		MOVB, M	Store first operand to B
F004	23		INX H	Increase HL pair
F005	AF		XRA A	Clear Accumulator
F006	4F		MOVC, A	Store 00H at register C
F007	86	LOOP	ADD M	Add memory element with Acc
F008	D2,0C, F0		JNC SKIP	When Carry flag is 0, skip next task
F00B	0C		INR C	Increase C when carry is 1
F00C	05	SKIP	DCR B	DecreaseB register
F00D	C2,07, F0		JNZ LOOP	Jump to loop when Z flag is not 1
F010	21,50, 80		LXIH,8050H	Load Destination address
F013	71		MOVM, C	Store C register content into memory
F014	23		INX H	Increase HL Pair
F015	77		MOVM, A	Store Acc content to memory
F016	76		HLT	Terminate the program

George John

Updated on: 26-Jun-2020

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