/*using Timer 1 for delay in Normal mode(TIMER1 - 16bit)
ATMega2560 clock = 16MHz*/

//#include<stdint.h>
void T0_ms_Delay(uint16_t);

void setup() {
  volatile uint8_t *DDR_F=(volatile uint8_t *)0x30;
  *DDR_F|=(1<<3);  //Settng portF 3rd pin as output pin
  volatile uint8_t *PORT_F=(volatile uint8_t *)0x31;
  Serial.begin(9600);
  while(1){
    *PORT_F^=(1<<3);
    T0_ms_Delay(50);
  }
}

void T0_ms_Delay(uint16_t ms){
  for(uint16_t i=0;i<ms;i++){
    Serial.print(i,DEC);
    Serial.print("\t");
    volatile uint8_t *TIMER0_TCNT0 = (volatile uint8_t *)0x46;
    *TIMER0_TCNT0 = 6;  //takes 250 pulses to generate 1ms delay, So 256-250=6, So count starts from 6
    volatile char *TIMER0_TCCR0A = (volatile char *)0x44;
    *TIMER0_TCCR0A = 0x00;
    volatile char *TIMER0_TCCR0B = (volatile char *)0x45;
    *TIMER0_TCCR0B = 0x03;                //Timer0, Normal Mode, Prescalar 64
    volatile char *TIMER0_TIFR0 = (volatile char *)0x35;
    //Serial.print(*TIMER0_TIFR0, DEC);
    while((*TIMER0_TIFR0 & 0x06) == 0x00);
    //Serial.print(*TIMER0_TIFR0, HEX);
    *TIMER0_TCCR0B = 0;
    *TIMER0_TIFR0 = 0;
  }
  
}

void loop() {
  // put your main code here, to run repeatedly:

}