1.c. 8-BIT MULTIPLICATION.

1.c. 8-BIT MULTIPLICATION.

AIM:

To write an assembly language program for the multiplication of two 8 – bit numbers.

APPARATUS REQUIRED:

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ALGORITHM:

1.      Start the program                                   

2.      Load the accumulator as zero

3.      Load the B-register as 05                     

4.      Load the multiplier to C-register

5.      Load the D-register for carry  

6.      Add the content of B to accumulator until C became zero

7.      Jump on no carry to step 9                  

8.      Increment the D-register                      

9.      Store the content of accumulator and D-register to memory

10. Stop the program

PROGRAM:

ADDRESS	LABEL	OPCODE	MNEMONICS	OPERAND	COMMENTS
4500		3E, 00	MVI	A, 00	Move data to accumulator
4502		06,data1	MVI	B, data1	Move multiplicand to b register
4504		0E,data2	MVI	C, data2	Move the multiplier to c register
4506		16,00	MVI	D, 00	Clear d reg for carry
4508	LOOP2	80	ADD	B	Repetitive addition
4509		D2, 0D, 45	JNC	LOOP1	Jump on no carry to an address
450C		14	INR	D	Increment the d register for carry
450D	LOOP1	0D	DCR	C	Decrement c register
450E		C2, 08,45	JNZ	LOOP2	Jump on no zero to address
4511		32,00,50	STA	5000	Store resultant product
4514		7A	MOV	A, D	Move carry to accumulator
4515		32,01,50	STA	5001	Store the carry.
4518		76	HLT		Stop the process.

INPUT: B =05, C =05         OUTPUT: 5001 = 19, 5002 – 00

RESULT:

Thus the assembly language program for 8-bit multiplication is executed and the results are verified.