11.1.1.4 4x PLL

The oscillator module contains a 4x Phase-Locked Loop (PLL) circuit that can be used with the external clock sources to provide a system clock source. The input frequency for the PLL must fall within a specified range. See the PLL Clock Timing Specifications found in the “Electrical Specifications” chapter for more information.

The PLL can be enabled for use through one of two methods:

1. Program the RSTOSC Configuration bits to select the ‘EXTOSC with 4x PLL’ option.
2. Write the NOSC bits to select the ‘EXTOSC with 4x PLL’ option.