#include <reg51.h>
void T0M1Delay(void);
sbit mybit=P1^5;
void main(void)
  {
   while(1)
    {
      mybit=~mybit;	
      T0M1Delay();	
    }
  }
void T0M1Delay(void)
  {
    TMOD=0x01;		
    TL0=0xFD;		
    TH0=0x4B;		
    TR0=1;			
    while(TF0==0);	
    TR0=0;			
    TF0=0;			
  }