All of the devices in the PIC18(L)F27/47K40family offer several different oscillator options. The PIC18(L)F27/47K40 family can be clocked from several
different sources:
- HFINTOSC
- 1-64 MHz precision digitally controlled internal oscillator
- LFINTOSC
- 31 kHz internal oscillator
- EXTOSC
- External clock (EC)
- Low-power oscillator (LP)
- Medium-power oscillator (XT)
- High-power oscillator (HS)
- SOSC
- Secondary oscillator circuit optimized for 32 kHz clock
crystals
- A Phase Lock Loop (PLL) frequency multiplier (4x) is available to the External Oscillator modes enabling clock speeds of up to 64 MHz
- Fail-Safe Clock Monitor: This option constantly monitors the main clock source against a reference signal provided by the LFINTOSC. If a clock failure occurs, the controller is switched to the internal oscillator block, allowing for continued operation or a safe application shutdown.