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STM32L151xx Cloccking PLL from external reference

Question asked by george on Mar 26, 2013
Latest reply on Mar 28, 2013 by fisher.burns
The Reference Manual states "The internal PLL can be clocked by the HSI RC or HSE crystal."

Is it possible to clock the PLL by feeding an external reference into OSC_IN?

If there is no signal present at OSC_IN will the PLL VCO free run and could this be used for a system clock?