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发光二极管跑马灯照片

跑马灯程序
org 0000h
ljmp 0030h

org 0030h
mov p1,#0ffh
start:
mov r0,#0
mov r1,#0feh
mov dptr,#lighttab

keyboard:
mov p3,#0ffh
mov a,p3
cjne a,#0ffh,kb0
ajmp kb3

kb0:
mov p3,#0ffh
mov a,p3
cjne a,#0ffh,kb0
inc r0
cjne r0,#3,kb1
ajmp start

kb1:
mov a,r0
movc a,@a+dptr
mov r1,a
kb3:
mov a,r1
mov p1,a
acall delay
rl a
mov r1,a
ajmp keyboard

lighttab:
db 0feh,0fch,0fah

delay:
mov r3,#40h
dy0:
mov r4,#0ffh
dy1:
mov r5,#0ffh
dy2:
djnz r5,dy2
djnz r4,dy1
djnz r3,dy0
ret

end

数码管测试程序
org 0000h
ljmp 0030h

org 0030h
ledshow:
mov dptr,#ledtab
mov r0,#0
ls0:
mov a,r0
movc a,@a+dptr
mov p0,#00h
acall delay
mov p0,a
mov a,r0
mov p2,a
acall delay
inc r0
cjne r0,#8,ls0
ajmp ledshow

ledtab:
db 3fh,06h,5bh,4fh,66h
db 6dh,7dh,07h,7fh,67h

delay:
mov r6,#0f0h
dys0:
djnz r6,dys0
ret

end

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