ALP For INTERFACING STEPPER MOTOR WITH 8051

Hi Friend here i am written ALP For INTERFACING STEPPER MOTOR WITH 8051

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.











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:

ORG 4100
START: 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