Pulse Generator using 8051

Providing Delay using internal timers of AT89c51. We are generating a pulse wave having 250ms ON time and 250ms OFF time. microcontroller clock time is 1.085us.
                                             25ms / 1.085us = 23041 = A5FE in hex
                                             25ms x 10 = 250ms                                             

#include<reg51.h>
void T0delay(void); // delay function
sbit Mybit=P2^0; // output port
void main(void)
{
unsigned char x;
while(1)
{
Mybit= ~Mybit; // inverter
for(x=0;x<10;x++)
T0delay();
}
}
void T0delay(void)
{
TMOD=0x01; // selecting timer-0 mode-1
TL0=0xFE;   // count starts at A5FE
TH0=0xA5;
TR0=1;        // timer-0 run
while(TF0==0); //wait until timer-0 flag overflow
TR0=0; // then stop timer-0
TF0=0; // reset the overflow flag
}

  

Result:     to see output