PLLSYS configuration register
| PLLSRC | Main PLL, PLLSAI1 and PLLSAI2 entry clock source |
| PLLM | Division factor M for the main PLL and audio PLL (PLLSAI1 and PLLSAI2) input clock |
| PLLN | Main PLLSYS multiplication factor N |
| PLLPEN | Main PLLSYSP output enable |
| PLLP | Main PLL division factor P for PPLSYSSAICLK |
| PLLQEN | Main PLLSYSQ output enable |
| PLLQ | Main PLLSYS division factor Q for PLLSYSUSBCLK |
| PLLREN | Main PLLSYSR PLLCLK output enable |
| PLLR | Main PLLSYS division factor R for SYSCLK (system clock) |