| DIR | INEN | PULLEN | OUT | Configuration |
|---|---|---|---|---|
| 0 | 0 | 0 | X | Reset or analog I/O: all digital disabled |
| 0 | 0 | 1 | 0 | Pull-down; input disabled |
| 0 | 0 | 1 | 1 | Pull-up; input disabled |
| 0 | 1 | 0 | X | Input |
| 0 | 1 | 1 | 0 | Input with pull-down |
| 0 | 1 | 1 | 1 | Input with pull-up |
| 1 | 0 | X | X | Output; input disabled |
| 1 | 1 | X | X | Output; input enabled |