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) |