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STM32f4 Discovery EXTI Clear pending bit

Question asked by shiveley.spencer on Jul 20, 2015
Latest reply on Jul 20, 2015 by Clive One
Hello all,
I tried searching for a bit but couldn't find anything pertaining to my question.I'm trying to set up an external interrupt but I don't understand why exactly we clear the pending bit in EXTI->PR and not in the NVIC_ICPRx (interrupt clear pending registers). Also on the STM32f4 do I need to set any special clocks for EXTI or just the Portx clock?