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|点动秒表 K1启动 K2暂停 K3清零 |
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#include <reg51.h>
char dq[10]={0XC0,0XF9,0XA4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x98};
unsigned int m;
char n,k;
void main()
{
P2=dq[0];
while(1)
{ m++;
if((m>25000)&&(k==1))
{ n++;
m=0;
}
if((P1&0x01)==0)
k=1;
if((P1&0x02)==0)
k=0;
if((P1&0x40)==0)
n=0;
P3=0x80;
P2=dq[n];
}
}