VTech Alphabert s Magic Readport User Manual download pdf (Page 61)

BM Dept., Govt. Engg. College, Gandhinagar Page 61

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

direction for full step mode:

Program 1: To rotate motor for 100 steps in clockwise direction (Full step)

ORG 30h

MOV P0,#00h ;Configure port P0 as an output port

MOV R0, #64h ;Load count value for 100 steps

MOV A,#11h ;Load accumulator with 11h

loop: MOV P0,A ;Sent data to port 1 (stepper motor)

delay: ACALL delay ;Delay to control speed

RL A ;Next data

DJNZ R0, loop ;Continue rotation if no. of steps<100

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

d_loop: DJNZ R2,d_loop

RET

END

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VTech Alphabert s Magic Readport User Manual Page 61