VTech Alphabert s Magic Readport User Manual download pdf (Page 62)

Lab Manual of Microcontroller & Interfacing Page 62

Sequence of pulses required to send on port P0 to rotate motor in clockwise and anticlockwise

direction for half step mode:

Program 2: To rotate motor in half step mode continuously in clockwise direction.

ORG 40h

LOOP:

MOV P0,,#00h ;Define port P0 as output port

MOV P0,#01h ;Sent data to port 1 (stepper motor)

CALL DELAY ;Delay to control speed

MOV P0,#03h ;Sent data to port 1 (stepper motor)

CALL DELAY ;Delay to control speed

MOV P0,#02h ;Sent data to port 1 (stepper motor)

CALL DELAY ;Delay to control speed

MOV P0,#06h ;Sent data to port 1 (stepper motor)

CALL DELAY ;Delay to control speed

MOV P0,#04h ;Sent data to port 1 (stepper motor)

CALL DELAY ;Delay to control speed

MOV P0,#0Ch ;Sent data to port 1 (stepper motor)

CALL DELAY ;Delay to control speed

MOV P0,#08h ;Sent data to port 1 (stepper motor)

CALL DELAY ;Delay to control speed

MOV P0,#09h ;Sent data to port 1 (stepper motor)

CALL DELAY ;Delay to control speed

JMP LOOP ;Continue rotation

DELAY: MOV R2,#0FFh ;Change this count to change speed

d_loop: DJNZ R2,d_loop

RET

END

:: WORKSHEET ::

A. Consider that two push-button switches are connected at port pins P3.2 and P3.3. Write a

program so that speed of the motor increases if switch connected at P3.2 pressed and

speed of the motor reduces if switch connected at port pin P3.3 is pressed.

(Hint: use polling method or interrupt method to monitor key press event, reduce timer

delay counter if switch connected at P3.2 is pressed. Increase time delay counter if switch

connected at P3.3 is pressed)

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