u can generate the 1sec delay like this….check this i think so itz helpful to u
#include<REG51.H>
sbit led1 = P1^1;
sbit led2 = P1^2;
sbit led3 = P1^3;
void delay (unsigned int k);
void main()
{
led1 = 1;
led2 = 0;
led3 = 0;
delay(1s);
led1 = 0;
led2 = 1;
led3 = 1;
delay(1s);
}
void delay(unsigned int k)
{
unsigned int i,j;
for(i=0;i<k;i++)
for(j=0;j<100;j++);
}