AFRL

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Interpret as AFRL

GPIO alternate function low register

AFSEL0	Alternate function selection for port x bit y (y = 0…7)
AFSEL1	Alternate function selection for port x bit y (y = 0…7)
AFSEL2	Alternate function selection for port x bit y (y = 0…7)
AFSEL3	Alternate function selection for port x bit y (y = 0…7)
AFSEL4	Alternate function selection for port x bit y (y = 0…7)

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