[51]数码管作时钟

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#include<reg52.h>

unsigned int led[]= {0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e}; //p0端0到f，0x7f为点

unsigned int ledx[]= {0x00,0x0e,0x0d,0x0b,0x07,0xff} ; //p2端都亮，到都灭

void delay(unsigned int xms) //延时函数 //延时程序

{

unsigned int x,y;

for(x=xms; x>0; x--)

for(y=110; y>0; y--);

}

sbit add = P3^4; //加按键

sbit minus = P3^5; //减按键

int a=0,b=0,c=0,d=0; //对应位数

int num=0; //计时变量

unsigned int wait=4; //定义等待时间

unsigned int youdian=0; //小数点显示判断

void main(void)

{

TMOD=0x01; //工作方式

TH0=(65536-45872)/256; // 赋值

TL0=(65536-45872)%256; //赋值

EA=1; //开总中断

ET0=1; //开定时器0中断

TR0=1; //自动定时器0

while(1)

{

P2=ledx[1];

P0=led[a];

delay(wait);

P2=ledx[2];

P0=led[b];

delay(wait);

P2=ledx[3];

P0=led[c];

delay(wait);

P2=ledx[4];

P0=led[d];

delay(wait);

if(youdian==1)

{

P0=0x7f;

P2=0x0d;

delay(wait);

}

if(d==-1)

{

c--;

d=9;

}

if(c==-1)

{

b--;

c=6;

}

if(b==-1)

{

a--;

b=9;

}

if(a==-1)

{

a=5;

b=9;

c=5;

d=9;

}

if(d==10)

{

c++;

d=0;

}

if(c==6)

{

b++;

c=0;

}

if(b==10)

{

a++;

b=0;

}

if(a==6)

{

a=0;

}

void T0_timer() interrupt 1

{

TH0=(65536-45872)/256; // 赋值

TL0=(65536-45872)%256; //赋值

num++;

if(minus==0)

{

d--;

num=0;

while(!minus)

{

num=0;

P2=ledx[1];

P0=led[a];

delay(wait);

P2=ledx[2];

P0=led[b];

delay(wait);

P2=ledx[3];

P0=led[c];

delay(wait);

P2=ledx[4];

P0=led[d];

delay(wait);

}

else if(add==0)

{

d++;

num=0;

while(!add)

{

num=0;

P2=ledx[1];

P0=led[a];

delay(wait);

P2=ledx[2];

P0=led[b];

delay(wait);

P2=ledx[3];

P0=led[c];

delay(wait);

P2=ledx[4];

P0=led[d];

delay(wait);

}

else if(num==20)

{

d++;

num=0;

if(youdian==0)youdian=1;

else if(youdian==1)youdian=0;

}

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