Wednesday 28 September 2011

Stepper Motor


8051 MICROCONTROLLER BASED EXPERIMENT (SIMPLE CONTROL APPLICATIONS)
STEPPER MOTOR
AIM:
            To write an assembly language program to run a stepper motor at different speed using 8051.
APPARATUS REQUIRED:
                                    8051 kit, power chord
ALGORITHM:
1.      Start the program.
2.      Move the address location to DPTR.
3.      Move the content of DPTR to A.
4.      PUSH the higher and lower byte address to DPH and DPL.
5.      Move immediate data to respective register.
6.      Give the delay signal to run the motor.
7.      Move the content of A TO dptr.
8.      POP the higher and lower byte address to DPH and DPL.
9.      Increment the DPTR.
10. End the program.

PROGRAM:    
ADDRESS
LABEL
OPCODE
MNEMONICS
OPERAND
4100
START
90,45,00
MOV
DPTR, #4500
4103

78,04
MOV
R0,#04
4105

E0
MOVX
A,@DPTR
4106

C0,83
PUSH 
DPH
4108

C0,82
PUSH
DPL
410A

90,FF,C0
MOV
DPTR, #FFC0
410D

7A,01
MOV
R2, #04
410F

79,22
MOV
R1, #0FF
4111
DLY1
7B,FF
MOV
R3, #0FF
4113
DLY
DB,FF
DJNZ
R3,DLY
4115

D9,FC
DJNZ
R1,DLY1
4117

DA,FA
DJNZ
R2,DLY1
4119

F0
MOVX
@DPTR,A
411A

D0,82
POP
DPL
411C

D0,83
POP
DPH
411E

A3
INC
DPTR
411F

D8,E4
DJNZ
R0,J0
4121

80,DD
SJMP
START
4123


END

4500
09,05,06,0A

FORWARD DATA: 09, 05, 06,0A
REVERSE DATA: 0A, 06, 05, and 09.
FAST DATA: 0F, 0A, 01, 02.
RESULT:
            Thus the stepper motor is observed to be rotating in different speed.

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