//occurs every timer tick
ISR(TIMER1_COMPA_vect)
{

	//Increase the millisecond counter
   totalMilliseconds++;


	//This applies any on-the-fly millisecond adjustment on the second
   if(totalMilliseconds >= 1000)
   {
		//Do we need to retard the clock?
		if(incrementMilliseconds < 0)
		{
			//We subtract the increment from the counter and exit
			//Second roll over will happen late
			totalMilliseconds += incrementMilliseconds;
			incrementMilliseconds = 0;
			return;
		}
		//Do we need to speed up the clock?
		else if(incrementMilliseconds > 0)
		{
			//We roll over the second.But instead of starting millisecond at 0
			//We start at incrementMilliseconds to speed up the clock
			totalMilliseconds = incrementMilliseconds;
			incrementMilliseconds = 0;
		
		}
		else
		{
			totalMilliseconds = 0;
		}
		
		totalSeconds++;
	
	//This function handles the PWM for the charger
	ChargeMilliSecond();
}