Connectivity line devices: reset and clock control (RCC)
RM0008
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.
106/995
Doc ID 13902 Rev 9
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