;流水燈實驗
;帶有選擇，外部0中斷時向左流水，外部中斷1時向右流水
	org 0000h
	ajmp main
	org 0003h
	ajmp zhongduanyi;按鍵一向左移位
	org 0013h
	ajmp zhongduaner;按鍵二向右移位
main:
	mov  a,#0feh
	mov ie,#85h;開中斷
	mov tcon,#5h;跳變出發
	mov ip,#1h;零口的優先級高
loop: jmp loop;主程序結束

zhongduanyi:
	clr ie.0
	setb ie.2
loop1:acall yanchi  ;調用延遲程序
	rl a
	mov p1,a
	ajmp loop1
reti
zhongduaner:
	clr ie.2
	setb ie.0
loop2:acall yanchi
	rr a
	mov p1,a
	ajmp loop2
reti
yanchi:  
  	mov r0,#0ffh
	mov r1,#0ffh
loop3:  nop
loop4:dec r1
	cjne r1,#0ffh,loop4
	dec r0
	cjne r0,#0ffh,loop3
ret
end