RM0008 Low-, medium-, high- and XL-density reset and clock control (RCC)
Doc ID 13902 Rev 12 89/1096
7.2 Clocks
Three different clock sources can be used to drive the system clock (SYSCLK):
● HSI oscillator clock
● HSE oscillator clock
● PLL clock
The devices have the following two secondary clock sources:
● 40 kHz low speed internal RC (LSI RC) which drives the independent watchdog and
optionally the RTC used for Auto-wakeup from Stop/Standby mode.
● 32.768 kHz low speed external crystal (LSE crystal) which optionally drives the real-
time clock (RTCCLK)
Each clock source can be switched on or off independently when it is not used, to optimize
power consumption.
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