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LPC1114 bypassing the system oscillator

Question asked by Haohao Liao on Dec 10, 2018
Latest reply on Dec 13, 2018 by Alice_Yang

I have a question regarding bypassing the system oscillator in LPC1114. If I enable the system oscillator bypass enable (set bit 0 of SYSOSCCTRL to be 1), I could connect an external clock source to XTALIN pin as the external clock source. However, from the following figure, I don't really know how this XTALIN pin is connected to the clock generation unit. Does anyone have any idea about this? 

 

To be more specific, if the system oscillator is bypass enabled and I connect a new clock source referred as CLK to the XTALIN pin, where is CLK connected to the above figure? Does it just replace the system oscillator?

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