#include <STC89C5xRC.H>
void Delay1ms(unsigned int xms) //@12.000MHz
{
unsigned char i, j;
while(xms--)
{
i = 2;
j = 239;
do
{
while (--j);
} while (--i);
}
}
void main()
{
unsigned char LEDNum=0;
while(1)
{
if(P31==0)
{
Delay1ms(20);
while(P31==0);
Delay1ms(20);
LEDNum++;
P2=~LEDNum;
}
}
}