Arduino

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## RTC Library

This library allows an Arduino Zero board to control use the internal RTC (Real Time Clock). A real-time clock is a clock that keeps track of the current time and that can be used in order to program actions at a certain time. Most RTCs use a crystal oscillator (like in the Arduino Zero) whose frequency is 32.768 kHz (same frequency used in quartz clocks and watches). Namely this the frequency equal to 2^15 cycles per second and so is a convenient rate to use with simple binary counter circuits. Furthermore the RTC can continue to operate in any sleep mode so it can be used to wake up the device from sleep modes in a programmed way.

#### Functions

- begin()
- setHours()
- setMinutes()
- setSeconds()
- setTime()
- setYear()
- setMonth()
- setDay()
- setDate()
- getHours()
- getMinutes()
- getSeconds()
- getYear()
- getMonth()
- getDay()
- setAlarmHours()
- setAlarmMinutes()
- setAlarmSeconds()
- setAlarmTime()
- setAlarmYear()
- setAlarmMonth()
- setAlarmDay()
- setAlarmDate()
- enableAlarm()
- disableAlarm()
- attachInterrupt()
- disableAlarm()

#### Examples

- Simple RTC
- Simple RTC Alarm

Reference Home

Corrections, suggestions, and new documentation should be posted to the Forum.

The text of the Arduino reference is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the reference are released into the public domain.

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