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docs/esp8266/general: Add note about RTC overflow.

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puuu 2016-05-31 22:38:07 +09:00 committed by Damien George
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docs/esp8266/general.rst
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@ -91,3 +91,12 @@ the following in ``main.py``::
This will allow to keep the structure of your application clear, as well as This will allow to keep the structure of your application clear, as well as
allow to install multiple applications on a board, and switch among them. allow to install multiple applications on a board, and switch among them.
Real-time clock
---------------
Due to limitations of the ESP8266 chip the internal real-time clock (RTC)
will overflow every 7:45h. If a long-term working RTC time is required then
``time()`` or ``localtime()`` must be called at least once within 7 hours.
MicroPython will then handle the overflow.