EXTI_FTSR2

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Interpret as EXTI_FTSR2

FT56=B_0x0

EXTI falling trigger selection register

FT39	Falling trigger event configuration bit of configurable event input x
FT40	Falling trigger event configuration bit of configurable event input x
FT51	Falling trigger event configuration bit of configurable event input 51
FT54	Falling trigger event configuration bit of configurable event input 54
FT56	Falling trigger event configuration bit of configurable event input 56 0 (B_0x0): Falling trigger disabled (for event and Interrupt) for input line 1 (B_0x1): Falling trigger enabled (for event and Interrupt) for input line.

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