#include<reg52.h>
#define uchar unsigned char
sbit k4=P3^6;
sbit k5=P3^7;
sbit beep=P2^3;
uchar num[4];
bit stop=1;
uchar table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,
0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
uchar time_count,min,sec,count;
void delay(uchar xms)
{
uchar j,k;
for(j=xms;j>0;j--)
for(k=112;k>0;k--);
}
void strat_time()
{
ET0=1;
TR0=1;
EA=1;
}
void stop_time()
{
ET0=0;
TR0=0;
EA=0;
}
void main()
{
TMOD=0X01;
TH0=(65536-46080)/256;
TL0=(65536-46080)%256;
while(1)
{
if(k4==0)
{
delay(10);
if(k4==0)
{
while(k4==0);
{
if(stop)
strat_time();
else
stop_time();
stop=~stop;
beep=1;
P1=0XFF;
}
}
}
else if(k5==0)
{
delay(10);
if(k5==0)
{
while(k5==0);
{
stop_time();
stop=1;
beep=1;
P1=0xff;
count=0;
time_count=0;
min=0;
sec=0;
}
}
}
if(stop)
{
count++;
if(count==100)
{
P1=~P1;
count=0;
}
}
else if(time_count==20)
{
time_count=0;
sec++;
if(sec==60)
{
sec=0;
min++;
}
if(min==60)
{
min=0;
}
beep=0;
delay(10);
beep=1;
num[0]=table[sec%10];
num[1]=table[sec/10];
num[2]=table[min%10];
num[3]=table[min/10];
}
}
}
void timer() interrupt 1
{
uchar j;
TH0=(65536-46080)/256;
TL0=(65536-46080)%256;
time_count++;
switch(j)
{
case 0:P2=0x8f;j++;P0=num[0];break;
case 1:P2=0x4f;j++;P0=num[1];break;
case 2:P2=0x2f;j++;P0=num[2];break;
case 3:P2=0x1f;j=0;P0=num[3];break;
}
}
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