STM32F411RE-0019-外部中斷是如何進行配置的

SYSCFG_EXTICR1~4這四個寄存器可以選擇外部中斷的pin。   有23個EXTI，分別是EXTI0~22； 對於EXIT0~15對應到各個GPIO組的16個PIN； EXTI line 16 is connected to the PVD output EXTI line 17 is connected to the RTC Alarm event EXTI line 18 is co

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