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HSE clock bypass means?

Question asked by ctc.ctc on Nov 28, 2016
Latest reply on Nov 29, 2016 by shingadaddy
Recently, I read reference manual about stm32f4 rcc,
but I have no idea about what is HSE clock bypass,
I only know that there is a bit in RCC->CR for HSE BYPASS.

I study the driver function RCC_HSEConfig()
there are three parameter RCC_HSE_OFF, RCC_HSE_ON, RCC_HSE_Bypass
But I still don't know why there is Bypass option?

Can anyone introduce bypass more detail? thanks =)