PLL N decoder
| NDEC | Decoded N-divider coefficient value |
| NREQ | NDEC reload request. When a 1 is written to this bit, the NDEC value is loaded into the PLL. Must be cleared by software for any subsequent load, or the PLL can be powered down and back up via the PDEN_SYS_PLL bit in the PDRUNCFG register if the NDEC value is changed. |
| RESERVED | Reserved. Read value is undefined, only zero should be written. |