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what is speed of GPIO?

Question asked by seo.sungchul.001 on Mar 27, 2014
Latest reply on Mar 27, 2014 by seo.sungchul.001
I'm really wondering what speed selection of GPIO is.
There are some options to select GPIO Speed, such as 2MHz, 25MHz, 50MHz and 100MHz.
What does the speed mean?
Which value is selected generally?