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Interrupts on PA0 and PB0

On an STM32, you want separate external interrupts on PA0 and PB0. Why does only one of them work?

A.Port B pins cannot generate external interrupts on this familyB.Both use EXTI line 0, which can come from only one port at a timeC.Pin 0 interrupts only work when a pull-down is enabled on the pinD.The NVIC can only enable one EXTI interrupt in the whole chip

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Interrupts on PA0 and PB0

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