5.2.2.1 HFINTOSC

The High-Frequency Internal Oscillator (HFINTOSC) is a precision digitally-controlled internal clock source that produces a stable clock up to 64 MHz. The HFINTOSC can be enabled through one of the following methods:

• Programming the RSTOSC<2:0> bits in Configuration Word 1 to ‘110’ (F_OSC = 1 MHz) or ‘000’ (F_OSC = 64 MHz) to set the oscillator upon device Power-up or Reset.
• Write to the NOSC<2:0> bits during run-time.

The HFINTOSC frequency can be selected by setting the HFFRQ<3:0> bits.