To choose the Timer edit Time.ccp Line to Timer number:

Example Timer 1:

```#Define TIMERVAR 1```

Same to Reserve Pin D8 for ICP1:

```#Define Pin8 1```

Codeexample:

Setup():

initTimer(2,0,2); //Standard Settings init (Timer2, Internal clock,INT0(Pin2) DS3231 SQWPin 1Hz->INT0

Loop() Overwiew:

CalibrateNow();

Serial.println("New Calculation Frequency for PrecMillis()");

Serial.println(recalculateF_CPU());

Serial.println(precmillis());

Serial.println( myprecmillis - mymillis - sync);

Output: (Good Measurement, The Millis from Core Drifts 2-4ms/Second) The Real Delay(1000) maybe ca. 1060ms

New Calculation Frequency for PrecMillis()

11993117

14591

39

15658

42

16725

45

17793

50

18860

55

19927

58

20995

63

22061

65

23129

71

24196

75

25263