版本 bdb84dc5b42890ece6fcfadfcc65ad9a46123c48

embedded/RTC

Changes from bdb84dc5b42890ece6fcfadfcc65ad9a46123c48 to 2245d5bbdba3d11aee30023d8bbe665ef74145d5

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

Configuration
================