mov ie,#00h
jb p3.0,fh
acall ms10
acall ms10
jnb p3.0,ct2
k3: cjne r5,#03h,k4
setb nca
clr ncb
setb p3.4
clr p3.5
mov 46h,#01h
mov 42h,4dh
mov 43h,4ch
mov ie,#00h
jb p3.0,fh
acall ms10
acall ms10
jnb p3.0,cd1
k4: cjne r5,#4h,k5
setb ncb
clr nca
mov 46h,#01h
mov ie,#00h
jb p3.0,fh
acall ms10
acall ms10
jnb p3.0,cd2
k5: cjne r5,#05h,fh
mov r5,#00h
setb p3.4
setb p3.5
ljmp qd
fh: ret
ct1:;-----常通个位定时减----
jnb p3.0,$
mov r4,4bh
dec 4bh
cjne r4,#00h,ct1a
mov 4bh,#09h
ct1a:mov 42h,4bh
ret;
ct2:;-----常通十位定时减----
jnb p3.0,$
mov r4,4ah
dec 4ah
cjne r4,#00h,ct2a
mov 4ah,#09h
上一篇：AT89C51编程器
