External interrupts Application
External input interrupt application [EXTI for STM32]

This is an example of an interrupt application with an external input signal. The following is an explanation of the unique part of external interrupts. Setting Spec.:Input  :PC13 Floating input Output:PA5 Push-pull output+500Ω+LED The point When using external interrupts, the clock must be supplied to AFIO in addition to GPIO.

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