#include <REGX52.H>
sbit LED = P2^3;
void Delay(unsigned int t)
{
while(t--);
}
void main()
{
unsigned char Time,i;
while (1)
{
for(Time=0;Time<100;Time++)
{
for(i=0;i<=20;i++)
{
LED=0;
Delay(Time);
LED=1;
Delay(100-Time);
}
}
for(Time=100;Time>0;Time--)
{
for(i=0;i<=20;i++)
{
LED=0;
Delay(Time);
LED=1;
Delay(100-Time);
}
}
}
}