利用8位數(shù)碼管顯示時(shí)間，原理與4位數(shù)碼管顯示的基本一樣

仿真圖：

程序源代碼:

本程序已經(jīng)通過在線軟件仿真和硬件制作.

org 0000h ;程序開始入口地址

sjmp main ;跳轉(zhuǎn)至主程序

org 000bh ;T0中斷入口地址

ljmp inti0 ;跳轉(zhuǎn)至T0中斷程序

org 001bh ;T1中斷入口地址

ljmp inti1 ;跳轉(zhuǎn)至T1中斷程序

org 0030h

main:mov tmod,#11h ;設(shè)T0、T1為模式1

mov ie,#8ah ;開T0、T1允許中斷

mov th0,#4ch ;賦T0 50ms初值

mov tl0,#00h

mov th1,#4ch ;賦T1 50ms初值

mov tl1,#00h

mov sp,#60h ;設(shè)置堆棧指針

mov 38h,#00 ;鬧鐘分初值

mov 39h,#00 ;鬧鐘時(shí)初值

mov 31h,#00 ;時(shí)間秒初值

mov 32h,#00 ;時(shí)間分初值

mov 33h,#00 ;時(shí)間時(shí)初值

setb tr0 ;啟動(dòng)定時(shí)器T0

setb tr1 ;啟動(dòng)定時(shí)器T1

loop:lcall display ;調(diào)用時(shí)間顯示程序

lcall keysan ;調(diào)用時(shí)間調(diào)節(jié)按鈕

lcall keynz ;調(diào)用鬧鐘控制按鈕

ajmp loop

inti0:push psw ;壓入堆棧指針，保護(hù)現(xiàn)場(chǎng)

push acc

clr ea ;關(guān)中斷www.dgzj.com

mov th0,#4ch ;重賦T0定時(shí)初值

mov tl0,#00h

inc 3ah ;3ah為50ms計(jì)數(shù)單元

mov a,3ah

cjne a,#20,out ;1秒計(jì)數(shù)是否到

mov 3ah,#00 ;清50ms計(jì)數(shù)初值

inc 31h ;秒加1

mov a,31h

cjne a,#60,out ;60秒計(jì)數(shù)是否到

mov 31h,#00

inc 32h ;分加1

mov a,32h

cjne a,#60,out ;60分計(jì)數(shù)是否到

mov 32h,#00

inc 33h ;時(shí)加1

mov a,33h

cjne a,#24,out ;24時(shí)計(jì)數(shù)是否到

mov 33h,#00

out: setb ea ;開中斷

pop acc ;彈出堆棧指針，恢復(fù)現(xiàn)場(chǎng)

pop psw

reti ;中斷返回

inti1:push psw ;壓入堆棧指針，恢復(fù)現(xiàn)場(chǎng)

push acc

clr ea

mov th1,#4ch ;重賦T1定時(shí)初值

mov tl1,#00h

inc 71h ;71h為50ms計(jì)數(shù)單元

mov a,71h

cjne a,#20,out1

mov 71h,#00

mov a,32h ;鬧鐘判斷

cjne a,38h,out1 ;鬧鐘時(shí)間分判斷

mov a,33h

cjne a,39h,out1 ;鬧鐘時(shí)間時(shí)判斷

clr p1.0 ;到鬧鐘時(shí)間，清p1.0

out1:setb ea ;開中斷

pop acc

pop psw

reti ;中斷返回

display:mov a,31h ;秒顯示

mov b,#10

p ab

mov 20h,a ;將十位放入20h單元

mov 21h,b ;將個(gè)位、余數(shù)放入21h單元

disp1: mov a,20h ;秒十位顯示

mov dptr,#table

movc a,@a+dptr ;將A的內(nèi)容+table內(nèi)容，結(jié)果回存給A

mov p0,a ;將A給P0口

clr p2.6 ;清p2.6,點(diǎn)亮第7位數(shù)碼管

lcall del1ms ;調(diào)用1ms延時(shí)子程序

setb p2.6 ;滅第7位數(shù)碼管

disp2: mov a,21h ;秒個(gè)位顯示

mov dptr,#table

movc a,@a+dptr

mov p0,a

clr p2.7

lcall del1ms

setb p2.7

disp4: mov a,32h ;分顯示

mov b,#10

p ab

mov 22h,a

mov 23h,b

disp5: mov a,22h ;分十位顯示

mov dptr,#table

movc a,@a+dptr

mov p0,a

clr p2.3

lcall del1ms

setb p2.3

disp6: mov a,23h ;分個(gè)位顯示

mov dptr,#table

movc a,@a+dptr

mov p0,a

clr p2.4

lcall del1ms

setb p2.4

disp7: mov a,33h ;時(shí)顯示

mov b,#10

p ab

mov 24h,a

mov 25h,b

disp8: mov a,24h ;時(shí)十位顯示

mov dptr,#table

movc a,@a+dptr

mov p0,a

clr p2.0

lcall del1ms

setb p2.0

disp9: mov a,25h ;時(shí)個(gè)位顯示

mov dptr,#table

movc a,@a+dptr

mov p0,a

clr p2.1

lcall del1ms

setb p2.1

disp10: mov 34h,#0bfh ;"-"顯示

mov a,34h

mov p0,a

clr p2.5

lcall del1ms

setb p2.5

disp11: mov 35h,#0bfh ;"-"顯示

mov a,35h

mov p0,a

clr p2.2

lcall del1ms

setb p2.2

ret

display1:mov a,38h ;鬧鐘分顯示

mov b,#10

p ab

mov 26h,a

mov 27h,b

d1:mov a,26h ;鬧鐘分十位顯示

mov dptr,#table

movc a,@a+dptr

mov p0,a

clr p2.3

lcall del1ms

setb p2.3

d2:mov a,27h ;鬧鐘分個(gè)位顯示

mov dptr,#table

movc a,@a+dptr

mov p0,a

clr p2.4

lcall del1ms

setb p2.4

dispnz: mov a,39h ;鬧鐘時(shí)顯示

mov b,#10

p ab

mov 28h,a

mov 29h,b

d5: mov a,28h ;鬧鐘時(shí)十位顯示

mov dptr,#table

movc a,@a+dptr

mov p0,a

clr p2.0

lcall del1ms

setb p2.0

d6: mov a,29h ;鬧鐘時(shí)個(gè)位顯示

mov dptr,#table

movc a,@a+dptr

mov p0,a

clr p2.1

lcall del1ms

setb p2.1

mov 35h,#0bfh ;"-"顯示

mov a,35h

mov p0,a

clr p2.2

lcall del1ms

setb p2.2

ret

table:db 0c0h,0f9h,0a4h,0b0h,99h,92h,82h,0f8h,80h,90h ;數(shù)字0—9

del1ms:mov r7,#10 ;1ms延時(shí)子程序

del1: mov r6,#50

del2:djnz r6,del2

djnz r7,del1

ret

del20ms:mov r5,#40 ;20ms延時(shí)子程序

del3: mov r4,#250

del4: djnz r4,del4

djnz r5,del3

ret

keysan:jnb p3.1,key1 ;秒加1按鈕

jnb p3.2,key2 ;分加1按鈕

jnb p3.3,key3 ;時(shí)加1按鈕

sjmp keyout

key1: lcall del20ms

jb p3.1,keyout

jnb p3.1,$

inc 31h ;秒加1

mov a,31h

cjne a,#60,keyout

mov 31h,#00

sjmp keyout

key2: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

key3:lcall del20ms

jb p3.3,keyout

jnb p3.3,$

inc 33h ;時(shí)加1

mov a,33h

cjne a,#24,keyout

mov 33h,#00

sjmp keyout

keyout:ret

keynz:jnb p3.4,keynz4 ;顯示鬧鐘并可修改和顯示當(dāng)前時(shí)間

jnb p3.7,keynz5

jnb p3.5,nz3

jnb p3.6,nz4

sjmp nzout

nzout:ret

nz2:lcall display1

jnb p3.5,nz3

jnb p3.6,nz4

keynz4:jnb p3.4,nz2

sjmp nzout

nz3:lcall del20ms

jb p3.5,nzout

jnb p3.5,$

inc 38h

mov a,38h

cjne a,#60,nzout

mov 38h,#00

sjmp nzout

nz4:lcall del20ms

jb p3.6,nzout

jnb p3.6,$

inc 39h

mov a,39h

cjne a,#24,nzout

mov 39h,#00

sjmp keyout

keynz5:jb p3.7,nzout

jnb p3.7,$

setb p1.0

sjmp nzout