Control de Motor a pasos con AVR, regulador de velocidad con PIN1 y 2 del puertoB, as{i como cambio de giro con PINES 3 y 4 del mismo puerto

.include "m8535def.inc"

.def Delay=r17
.def Delay2=r18

RESET:
ser r16
out DDRA,r16
ldi r16,0
out DDRB,r16
ser r16
out DDRC,r16

CICLO: sbis PINB,0x04
rjmp CICLO2
sbis PINB,0x01
inc r19
sbis PINB,0x02
dec r19
out PORTA,r19
;ldi r19,7
ldi r16,1
out PORTC,r16
mov Delay2,r19
DLY21:
dec Delay
brne DLY21
dec Delay2
brne DLY21

ldi r16,3
out PORTC,r16
mov Delay2,r19
DLY22:
dec Delay
brne DLY22
dec Delay2
brne DLY22

ldi r16,2
out PORTC,r16
mov Delay2,r19
DLY23:
dec Delay
brne DLY23
dec Delay2
brne DLY23

ldi r16,6
out PORTC,r16
mov Delay2,r19
DLY24:
dec Delay
brne DLY24
dec Delay2
brne DLY24
ldi r16,4
out PORTC,r16
mov Delay2,r19
DLY25:
dec Delay
brne DLY25
dec Delay2
brne DLY25
ldi r16,12
out PORTC,r16
mov Delay2,r19
DLY26:
dec Delay
brne DLY26
dec Delay2
brne DLY26
ldi r16,8
out PORTC,r16
mov Delay2,r19
DLY27:
dec Delay
brne DLY27
dec Delay2
brne DLY27
ldi r16,9
out PORTC,r16
mov Delay2,r19
DLY28:
dec Delay
brne DLY28
dec Delay2
brne DLY28
rjmp CICLO

CICLO2: sbis PINB,0x03
rjmp CICLO
sbis PINB,0x01
inc r19
sbis PINB,0x02
dec r19
out PORTA,r19
;ldi r19,7
ldi r16,9
out PORTC,r16
mov Delay2,r19
DLY1:
dec Delay
brne DLY1
dec Delay2
brne DLY1

ldi r16,8
out PORTC,r16
mov Delay2,r19
DLY2:
dec Delay
brne DLY2
dec Delay2
brne DLY2

ldi r16,12
out PORTC,r16
mov Delay2,r19
DLY3:
dec Delay
brne DLY3
dec Delay2
brne DLY3

ldi r16,4
out PORTC,r16
mov Delay2,r19
DLY4:
dec Delay
brne DLY4
dec Delay2
brne DLY4
ldi r16,6
out PORTC,r16
mov Delay2,r19
DLY5:
dec Delay
brne DLY5
dec Delay2
brne DLY5
ldi r16,2
out PORTC,r16
mov Delay2,r19
DLY6:
dec Delay
brne DLY6
dec Delay2
brne DLY6
ldi r16,3
out PORTC,r16
mov Delay2,r19
DLY7:
dec Delay
brne DLY7
dec Delay2
brne DLY7
ldi r16,1
out PORTC,r16
mov Delay2,r19
DLY8:
dec Delay
brne DLY8
dec Delay2
brne DLY8
rjmp CICLO2