SCT input register
| AIN0 | Real-time status of input 0. |
| AIN1 | Real-time status of input 1. |
| AIN2 | Real-time status of input 2. |
| AIN3 | Real-time status of input 3. |
| RESERVED | Reserved. |
| SIN0 | Input 0 state synchronized to the SCT clock. |
| SIN1 | Input 1 state synchronized to the SCT clock. |
| SIN2 | Input 2 state synchronized to the SCT clock. |
| SIN3 | Input 3 state synchronized to the SCT clock. |
| RESERVED | Reserved |