Alternate function 0 (type state, Analog)
Alternate function 1 (type state, GPIO)
Alternate function 2 (type state, chip specific)
Alternate function 3 (type state, chip specific)
Alternate function 4 (type state, chip specific)
Alternate function 5 (type state, chip specific)
Alternate function 6 (type state, chip specific)
Alternate function 7 (type state, chip specific / JTAG / NMI)
Floating input (type state)
Input mode (type state)
Open drain output (type state)
Output mode (type state)
Pulled down input (type state)
Pulled up input (type state)
Push pull output (type state)