FTSR3

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Interpret as FTSR3

EXTI falling trigger selection register

TR82	Falling trigger event configuration bit of Configurable Event input x+64
TR84	Falling trigger event configuration bit of Configurable Event input x+64
TR85	Falling trigger event configuration bit of Configurable Event input x+64
TR86	Falling trigger event configuration bit of Configurable Event input x+64

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