8.2.1.4 4x PLL

The oscillator module contains a 4x PLL that can be used with the external clock sources to provide a system clock source. The input frequency for the PLL must fall within specifications.

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

1. Program the RSTOSC bits in the Configuration Word 1 to ‘010’ (enable EXTOSC with 4x PLL).
2. Write the NOSC bits to ‘010’ (enable EXTOSC with 4x PLL).