版本 2245d5bbdba3d11aee30023d8bbe665ef74145d5
Changes from 2245d5bbdba3d11aee30023d8bbe665ef74145d5 to 12235236d59cd8f786e3886844dc39dbeff651cc
Introduction
=============
A real-time clock (RTC) is a computer clock that keeps track of the current time. RTCs are also present in almost any electronic device that requires accurate time keeping. The real-time clock (RTC) embedded in STM32 microcontrollers acts as an independent BCD timer/ counter.
Clock Source
=============
LSI RC : 32 kHz
LSE OSC : 32.768 kHz
HSE OSC : 4-26 MHz
.. image:: /clock source.png
.. image:: /stm32F4 RTC clock source
Configuration
================
