/*数码管前三位显示一个跑表，三个独立键盘实现按下第一个时计时停止，
按下第二个时计时开始，按下第三个是计数值清零从头开始。*/
#include<reg52.h>
#define uint unsigned int
#define uchar unsigned char
sbit key1=P3^2;
sbit key2=P3^3;
sbit key3=P3^4;
sbit w1=P2^0;
sbit w2=P2^1;
sbit w3=P2^2;
uchar num,t0,bai,shi,ge,flag;
uint shu;
uchar code table[]={
0xc0,0xf9,0xa4,0xb0,0x99,
0x92,0x82,0xf8,0x80,0x90};
void delay(uint z);
void init();
void display(uchar bai,uchar shi,uchar ge);
void keyscan();
void main()
{
init();
while(1)
{
keyscan();
if(flag==0)
display(bai,shi,ge);
else
display(0,0,0);
}
}
void init()
{
shu=0;
t0=0;
flag=0;
TMOD=0x01;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
EA=1;
ET0=1;
TR0=1;
}
void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
void timer0() interrupt 1
{
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
t0++;
if(t0==3)
{
t0=0;
shu++;
bai=shu/100;
shi=shu%100/10;
ge=shu%10;
if(shu==1000)
shu=0;
}
}
void display(uchar bai,uchar shi,uchar ge)
{
P0=0xff;
w1=0;
P0=table[bai];
w1=1;
delay(1);
P0=0xff;
w2=0;
P0=table[shi];
w2=1;
delay(1);
P0=0xff;
w3=0;
P0=table[ge];
w3=1;
delay(1);
}
void keyscan()
{
if(key1==0)
{
while(!key1);
TR0=0;
}
if(key2==0)
{
while(!key2);
flag=0;
TR0=1;
}
if(key3==0)
{
while(!key3);
shu=0;
flag=1;
TR0=0;
}
}
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