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#include <reg51.h>
#define DUAN P0
#define WEI P2
#define uchar unsigned char
#define uint unsigned int
unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
sbit key0=P3^0; //歸零
sbit key1=P3^1; // 歸12
sbit key2=P3^2; //分鐘加一
sbit key3=P3^3; //暫停/開始
sbit beep=P3^7;
uint addnum;
uchar miaonum,fennum;
uchar b;
void delay(unsigned int num) //時間函數(shù)
{
unsigned i,j;
for(i=num;i>0;i--)
for(j=120;j>0;j--);
}
void main()
{
TMOD=0x02;
TL0=TH0=6;
ET0=1;
EA=1;
TR0=0;
beep=0;
b=10;
fennum=12;
miaonum=0;
while(1)
{
P2=0xff;
WEI=0xef;
DUAN=table[miaonum/10];
delay(5);
P2=0xff;
WEI=0xdf;
DUAN=table[miaonum%10];
delay(5);
P2=0xff;
WEI=0Xf7;
DUAN=0X40;
delay(5);
P2=0xff;
WEI=0xfd;
DUAN=table[fennum/10];
delay(5);
P2=0xff;
WEI=0xfb;
DUAN=table[fennum%10];
delay(5);
if(!key0) //清零
{
delay(10);
if(!key0)
{
fennum=0;
miaonum=0;
}
while(!key0);
}
if(!key1) //分鐘歸10
{
delay(10);
if(!key1)
{
fennum=10;
}
while(!key1);
}
if(!key2) //分鐘加1
{
delay(10);
if(!key2)
{
fennum++;
}
while(!key2);
}
if(!key3) //暫停/開始
{
delay(10);
if(!key3)
{
TR0=~TR0;
while(!key3);
}
}
}
}
void timer0() interrupt 1
{
addnum++;
if(addnum==400)
{
if(fennum!=0)
{
if(miaonum==0)
miaonum=59,fennum--,addnum=0;
else
miaonum--;
addnum=0;
}
if(fennum==0)
{
if(miaonum==0)
miaonum=0;
else
miaonum--;
addnum=0;
}
if(fennum==0)
{
if(miaonum==0)
{
if(b==0)
beep=0;
else
beep=1,b--;
}
}
}
}

復(fù)制代碼

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