APPARATUS REQUIRED:

• 8051 Trainer Kit
• Stepper Motor Interface Board

THEORY:

A motor in which the rotor is able to assume only discrete stationary angular position is a stepper motor. The rotor motion occurs in a stepwise manner from one equilibrium position to next.

The motor under our consideration uses 2 – phase scheme of operation. In this scheme, any two adjacent stator windings are energized. The switching condition for the above said scheme is shown in Table.

Clockwise

Anti – Clockwise

In order to vary the speed of the motor, the values stored in the registers R1, R2, R3 can be changed appropriately.

ALGORITHM:

1. Store the look up table address in DPTR
2. Move the count value (04) to one of the register (R0)
3. Load the control word for motor rotation in accumulator
4. Push the address in DPTR into stack
5. Load FFC0 in to DPTR.
6. Call the delay program
7. Send the control word for motor rotation to the external device.
8. Pop up the values in stack and increment it.
9. Decrement the count in R0. If zero go to next step else proceed to step 3.
10. Perform steps 1 to 9 repeatedly.

PROGRAM:

START: ORG 4100
       MOV DPTR,#4500H
       MOV R0,#04
AGAIN: MOVX A,@DPTR
       PUSH DPH
       PUSH PDL
       MOV DPTR,#FFC0H
       MOV R2, 04H
       MOV R1,#FFH
DLY1:  MOV R3, #FFH
DLY:   DJNZ R3,DLY
       DJNZ R1,DLY1
       DJNZ R2,DLY1
       MOVX @DPTR,A
       POP DPL
       POP DPH
       INC DPTR
       DJNZ R0,AGAIN
       SJMP START

DATA:

4500: 09, 05, 06, 0A

RESULT:

Thus the speed and direction of the motor were controlled using 8051 trainer kit.

The post Interface stepper motor with 8051 Trainer Kit parallel port first appeared on Student Projects.

ALGORITHM:

1. For Bit addressing, Select Bank 1 of RAM by setting 3^rd bit of PSW
2. Using Register 0 of Bank 1 and accumulator perform addition
3. For direct addressing provide the address directly (30 in this case)
4. Use the address and Accumulator to perform addition
5. Verify the results

PROGRAM:

        SETB	PSW.3
        MOV	R0,#data1
        MOV	A,#data2
        ADD	A,R0
        MOV	DPTR,#4500
        MOVX	@DPTR,A
HERE:	SJMP	HERE

Direct Addressing:

        MOV	30,#data1
        MOV	A,#data2
        ADD	A,30
        MOV	DPTR,#4500
        MOVX	@DPTR,A
HERE:   SJMP	HERE

OBSERVATION:

Bit addressing:

Direct addressing:

RESULT:

Thus the program to exhibit the different RAM addressing schemes of 8051 was executed.

The post ASM program to exhibit the RAM direct addressing first appeared on Student Projects.

ALGORITHM:

1. Get the data in A – reg.
2. Get the value to be divided in B – reg.
3. Divide the two data
4. The quotient is in A – reg.
5. The remainder is in B – reg.
6. Store the results.

PROGRAM:

        ORG	4100
        CLR	C
        MOV	A,#data1
        MOV	B,#data2
        DIV	AB
        MOV	DPTR,#4500
        MOVX	@DPTR,A
        INC	DPTR
        MOV	A,B
        MOVX	@DPTR,A
HERE:	SJMP	HERE

OBSERVATION:

RESULT:

Thus the program to perform multiplication of two 8 – bit numbers using 8051 instruction set was executed.

The post ASM program to divide two 8 bit numbers using 8051 instruction set first appeared on Student Projects.

ALGORITHM:

1. Get the data in A – reg.
2. Get the value to be multiplied in B – reg.
3. Multiply the two data
4. The higher order of the result is in B – reg.
5. The lower order of the result is in A – reg.
6. Store the results.

PROGRAM:

        ORG	4100
        CLR	C
        MOV	A,#data1
        MOV	B,#data2
        MUL	AB
        MOV	DPTR,#4500
        MOVX	@DPTR,A
        INC	DPTR
        MOV	A,B
        MOVX	@DPTR,A 
HERE:	SJMP	HERE

OBSERVATION:

RESULT:

Thus the program to perform multiplication of two 8 – bit numbers using 8051 instruction set was executed.

The post ASM program to multiply two 8 bit numbers using 8051 instruction set first appeared on Student Projects.

ALGORITHM:

1. Clear C – register for Carry
2. Get the data immediately .
3. Add the two data
4. Store the result in memory pointed by DPTR

PROGRAM:

        ORG	4100
        CLR	C
        MOV	A,#data1
        ADD	A,#data2
        MOV	DPTR,#4500
        MOVX	@DPTR,A 
HERE:	SJMP	HERE

OBSERVATION:

RESULT:

Thus the program to perform the addition of two 8 – bit numbers using 8051 instruction set was executed.

The post ASM program to add two 8 bit numbers using 8051 instruction set first appeared on Student Projects.