STMicroelectronics Discovery kit for STM32L151/152 line - with STM32L152RC MCU STM32L152C-DISCO STM32L152C-DISCO Hoja De Datos

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DocID022799 Rev 6
STM32L15xCC STM32L15xRC STM32L15xUC STM32L15xVC
Electrical characteristics
111
6.3.6 External 
clock 
source characteristics
High-speed external user clock generated from an external source
In bypass mode the HSE oscillator is switched off and the input pin is a standard GPIO.The 
external clock signal has to respect the I/O characteristics in 
. However, the 
recommended clock input waveform is shown in