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class RTC -- real time clock
============================
The RTC is and independent clock that keeps track of the date
and time.
Example usage::
rtc = pyb.RTC()
rtc.datetime((2014, 5, 1, 4, 13, 0, 0, 0))
print(rtc.datetime())
Constructors
------------
.. class:: pyb.RTC()
Create an RTC object.
Methods
-------
.. method:: rtc.datetime([datetimetuple])
Get or set the date and time of the RTC.
With no arguments, this method returns an 8-tuple with the current
date and time. With 1 argument (being an 8-tuple) it sets the date
and time.
The 8-tuple has the following format:
(year, month, day, weekday, hours, minutes, seconds, subseconds)
``weekday`` is 1-7 for Monday through Sunday.
``subseconds`` counts down from 255 to 0
.. method:: rtc.info()
Get information about the startup time and reset source.
- The lower 0xffff are the number of milliseconds the RTC took to
start up.
- Bit 0x10000 is set if a power-on reset occurred.
- Bit 0x20000 is set if an external reset occurred
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