4位數(shù)碼管電子時鐘（冒號為秒閃爍）
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org 0000h
ajmp main
org 000bh
ljmp inti0
org 0030h
main: mov ie,#82h
mov tmod,#01h
mov th0,#4ch
mov tl0,#00h
mov 31h,#00
mov 32h,#00
mov 33h,#00
mov sp,#60h
setb tr0
loop:lcall display
lcall keyer
ajmp loop
display: mov a,31h ;秒顯示
mov b,#10
div ab
mov 20h,a
mov 21h,b
disp1: mov a,20h ;秒十位顯示
mov dptr,#table
movc a,@a+dptr
mov p0,a
clr p2.0
lcall del1ms
setb p2.0
disp2: mov a,21h ;秒個位顯示
mov dptr,#table
movc a,@a+dptr
mov p0,a
clr p2.1
lcall del1ms
setb p2.1
disp3: mov a,32h ;分顯示
mov b,#10
div ab
mov 22h,a
mov 23h,b
disp4: mov a,22h ;分十位顯示
mov dptr,#table
movc a,@a+dptr
mov p0,a
clr p2.6
lcall del1ms
setb p2.6
disp5: mov a,23h ;分個位顯示
mov dptr,#table
movc a,@a+dptr
mov p0,a
clr p2.7
lcall del1ms
setb p2.7
disp6: mov a,33h ;時顯示
mov b,#10
div ab
mov 24h,a
mov 25h,b
disp7: mov a,24h ;時十位顯示
mov dptr,#table
movc a,@a+dptr
mov p0,a
clr p2.4
lcall del1ms
setb p2.4
disp8: mov a,25h ;時個位顯示
mov dptr,#table
movc a,@a+dptr
mov p0,a
clr p2.5
lcall del1ms
setb p2.5
ret
inti0:push acc
push psw
clr ea
mov th0,4ch
mov tl0,#00h
inc 3ah
mov a,3ah
cjne a,#40,out
mov 3ah,#00
cpl p2.2
inc 31h ;秒加1
mov a,31h
cjne a,#60,out
mov 31h,#00
inc 32h ;分加1
mov a,32h
cjne a,#60,out
mov 32h,#00
inc 33h ;時加1
mov a,33h
cjne a,#24,out
mov 33h,#00
out:setb ea
pop psw
pop acc
reti
table: db 0c0h,0f9h,0a4h,0b0h,99h,92h,82h,0f8h,80h,90h
del1ms: mov r7,#10
del1:mov r6,#50
del2:djnz r6,del2
djnz r7,del1
ret
del20ms:mov r5,#40
del3:mov r4,#250
del4:djnz r4,del4
djnz r5,del3
ret
keyer:jnb p3.2,key1 ;分加1按鈕
jnb p3.3,key2 ;時加1按鈕
sjmp keyout
key1:lcall del20ms
jb p3.2,keyout
jnb p3.2,$
inc 32h ;分加1
mov a,32h
cjne a,#60,keyout
mov 32h,#00
sjmp keyout
key2:lcall del20ms
jb p3.3,keyout
jnb p3.3,$
inc 33h ;時加1
mov a,33h
cjne a,#24,keyout
mov 33h,#00
sjmp keyout
keyout:ret
end
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