Distinguish GPIO port from external interrupt

[XLei.1]

Hello,

I'm some confused how external interrupt is working with GPIO. If PA3 and PB3 are both configured as external interrupt, and assume the two interrupts are not coming simultaneously, how to determine which PIN generates the interrupt when EXTI3 is triggered?

Thanks in advance!

[TDK · Accepted solution]

For a given pin number, only one port may be in EXTI mode at a time. It is not possible to have PA3 and PB3 be configured as external interrupt simultaneously.

[XLei.1]

Thanks TDK, then it makes sense now.