Square Wave Generation using Delay in 8051

To create a square wave generation using Delay.

let us say we want to construct a 1khz square waveform

the processor instruction cycle of 8051 is 1.085microseconds

so for 1khz (1milli seconds =1/1khz), is 1ms/1.085microseconds = 921.6 (this value is set to the for loop)

#include <reg51.h>

void delay()

{

for(i=0;i<922;i++)

}

void main()

{

P0=0xff;

delay();

P0=0x00;

delay();

}