Low-Power RC (LPRC) Oscillator
The LPRC Oscillator is separate from the Fast RC Oscillator. It oscillates at a nominal frequency of 31.25 kHz. The LPRC Oscillator is the clock source for the Power-up Timer (PWRT), Watchdog Timer (WDT), Fail-Safe Clock Monitor (FSCM) and Phase-Locked Loop (PLL) reference circuits. It may also be used to provide a low-frequency clock source option for the device in those applications where power consumption is critical and timing accuracy is not required.
// default System clock = LPRC #pragma config FNOSC = LPRC ... // System Clock = LPRC (run-time config) PLIB_OSC_SysClockSelect(OSC_ID_0, OSC_LPRC);