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STM32F103 GPIO Output Speed

Question asked by baptista.joao on Sep 21, 2012
Latest reply on Sep 21, 2012 by Clive One
When I program a GPIO pin, I have to define a "speed": 2, 10 or 50MHz. What does this mean in terms of hardware? Is this a filter?
If I program the pin with 2MHz I can't output a signal with 5MHz. What is the hardware implemented in the port circuit that cuts (filter) the output signal frequency?

Thank you