GPIO port D hardware configuration register 7
| FAST_AF_IO0 | Indicate which is the fastest AF for I/Oy (0 to F) |
| FAST_AF_IO1 | Indicate which is the fastest AF for I/Oy (0 to F) |
| FAST_AF_IO2 | Indicate which is the fastest AF for I/Oy (0 to F) |
| FAST_AF_IO3 | Indicate which is the fastest AF for I/Oy (0 to F) |
| FAST_AF_IO4 | Indicate which is the fastest AF for I/Oy (0 to F) |
| FAST_AF_IO5 | Indicate which is the fastest AF for I/Oy (0 to F) |
| FAST_AF_IO6 | Indicate which is the fastest AF for I/Oy (0 to F) |
| FAST_AF_IO7 | Indicate which is the fastest AF for I/Oy (0 to F) |