Control register
| RESP | Reset position counter. When set = 1, resets the position counter to all zeros. Autoclears when the position counter is cleared. |
| RESPI | Reset position counter on index. When set = 1, resets the position counter to all zeros once only the first time an index pulse occurs. Autoclears when the position counter is cleared. |
| RESV | Reset velocity. When set = 1, resets the velocity counter to all zeros, reloads the velocity timer, and presets the velocity compare register. Autoclears when the velocity counter is cleared. |
| RESI | Reset index counter. When set = 1, resets the index counter to all zeros. Autoclears when the index counter is cleared. |
| RESERVED | Reserved. Read value is undefined, only zero should be written. |