motor.asm

来自「可用于控制步进电机正反转的51单片机汇编程序」· 汇编 代码 · 共 97 行

org 00h
x1:mov r3,#250
start:mov r0,#00h
start1:
clr p3.5
mov p0,#0ffh
mov p1,#25h
mov p2,#00h
setb p3.5
nop
nop
clr p3.5
mov p1,#25h
mov p2,#01h
setb p3.5
nop
nop
mov a,r0
mov dptr,#table
movc a,@a+dptr
jz start
cpl a
mov p0,a

clr p3.5
mov p1,#25h
mov p2,#00h
setb p3.5
nop
nop
clr p3.5
mov p1,#25h
mov p2,#01h
setb p3.5
nop
nop

call delay
inc r0
djnz r3,start1
mov r3,#250
start2:
mov p0,#0ffh

clr p3.5
mov p1,#25h
mov p2,#00h
setb p3.5
nop
nop
clr p3.5
mov p1,#25h
mov p2,#01h
setb p3.5
nop
nop

 mov r0,#05
start3:mov a,r0
mov dptr,#table
movc a,@a+dptr

jz start2
cpl a
mov p0,a

clr p3.5
mov p1,#25h
mov p2,#00h
setb p3.5
nop
nop
clr p3.5
mov p1,#25h
mov p2,#01h
setb p3.5
nop
nop

call delay
inc r0
djnz r3,start3
jmp x1
delay:	mov r5,#40;???
d1: 	mov r6,#10
d2:	mov r7,#18
	djnz r7,$
	djnz r6,d2
	djnz r5,d1
	ret
table:
db 0Ch,06h,03h,09h
db 00
db 09h,03h,06h,0Ch
db 00
end