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Where does the "Frequency(PCLK2)= 3⁄8×Frequency(SDIO_CK)" limitation for STM32F103 come from?

Question asked by mueller.moritz on Oct 2, 2012
Latest reply on Jan 12, 2016 by Clive One
Hi,

does anybody know why there is this limitation (stated in RM0008)? 
(For the F4xxx the PCLK2-frequency has to be greater or equal)

So my next question is: what happens if I increase my PCLK2-frequency?

Thanks,
Moritz

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