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setting clock frequency for GPIO periphery in efr32fg14 EVM

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yefj

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Hello i am trying to understand how to control the clock of GPIO periphery for my efr32 evm board.
I have tried to use the following manual link shown bellow.
We have a main source and pre-scalers which is fed to the GPIO periphery.
I am having problem understand the table bellow., it hase 1_1 2_1 its confusing.
For GPIO what is the main sorce and what are the prescalers?
Thanks.
https://www.silabs.com/documents/public/application-notes/an0004.1-efm32-cmu.pdf
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