我帮他改!!
org 0000h
ajmp start
org 000bh
ajmp time0
org 30h
start:
mov p1,#0ffh
mov 30h,#00h
mov tmod,#00000001b
mov th0,#3ch
mov tl0,#0b0h
setb ea
setb et0
setb tr0
loop: ajmp loop
time0:
push acc
push psw
inc 30h
mov a,30h
cjne a,#20,t_ret
t_l1: cpl p1.0
mov 30h,#0
t_ret:
mov th0,#15h
mov tl0,#9fh
pop psw
pop acc
reti
end