版本 bdb84dc5b42890ece6fcfadfcc65ad9a46123c48
embedded/RTC
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