#include <reg52.h>
#define uint unsigned int
#define uchar unsigned char
uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71};
uchar bai,shi,ge;
uint t,a;
sbit duan=P2^6;
sbit wei=P2^7;
sbit into=P3^2;
sbit t0=P3^4;
sbit s4=P3^6;
void keyscan();
void delay(uint t)
{
uint x,y;
for(x=t;x>0;x--)
for(y=110;y>0;y--);
}
void init()
{
TMOD=0X01;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
EA=1;
ET0=1;
TR0=1;
}
void timer0() interrupt 1
{
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
t++;
if(t==2)
{
t=0;
a++;
bai=a/100;
shi=a%100/10;
ge=a%10;
if(a==1000)
{
a=0;
}
}
}
void display(uchar bai,uchar shi,uchar ge)
{
//************************
P0=table[bai];
duan=1;
duan=0;
P0=0xff;
P0=0xfe;
wei=1;
wei=0;
delay(5);
//************************
P0=table[shi];
duan=1;
duan=0;
P0=0xff;
P0=0xfd;
wei=1;
wei=0;
delay(5);
//************************
P0=table[ge];
duan=1;
duan=0;
P0=0xff;
P0=0xfb;
wei=1;
wei=0;
delay(5);
}
void main()
{
init();
while(1)
{
keyscan();
display(bai,shi,ge);
}
}
void keyscan()
{
if(into==0)
{
delay(10);
if(into==0)
{
while(!into);
TR0=0;
}
}
if(t0==0)
{
delay(10);
if(t0==0)
{
while(!t0);
TR0=1;
}
}
if(s4==0)
{
delay(10);
if(s4==0)
{
t=0;
a=0;
while(!s4);
}
}
}
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