Microcontroller Projects

how-to-generate-one-minute-delay-with-8051-microcontroller.c

#include<reg51.h>
sbit led=P1^0;
void delay()
{
int count=0,sec;
for(sec=0;sec<60;sec++){
count=0;
while(count!=500)
{
TMOD=0x01;  //16-bit timer0 selected
TH0=0xF8;   // Loading high byte in TH
TL0=0xCC;   // Loaded low byte in TL
TR0=1;      // Running the timer
while(!TF0);   //Checking the timer flag register if it is not equal to 1 
TR0 = 0;      // If TF0=1 stop the timer
TF0 = 0;      // Clear the Timer Flag bit for next calculation
count++;
}}}
void main()
{
P1=0x00;    //Port-1 as Output Port
delay();
while(1)     // Constantly  running while loop.
{
led=1;    // LED glows here
delay();  // Delay for 1 second 
led=0;    // LED switch off
delay();  // Delay for 1 second
}}