APBB Mask
| USB_ | USB APB Clock Enable |
| DSU_ | DSU APB Clock Enable |
| NVMCTRL_ | NVMCTRL APB Clock Enable |
| PORT_ | PORT APB Clock Enable |
| HMATRIX_ | HMATRIX APB Clock Enable |
| EVSYS_ | EVSYS APB Clock Enable |
| SERCOM2_ | SERCOM2 APB Clock Enable |
| SERCOM3_ | SERCOM3 APB Clock Enable |
| TCC0_ | TCC0 APB Clock Enable |
| TCC1_ | TCC1 APB Clock Enable |
| TC2_ | TC2 APB Clock Enable |
| TC3_ | TC3 APB Clock Enable |
| RAMECC_ | RAMECC APB Clock Enable |