PIC18F2455/2550/4455/4550 devices can be operated
in twelve distinct oscillator modes. In contrast with previous
PIC18 enhanced microcontrollers, four of these
modes involve the use of two oscillator types at once.
Users can program the FOSC3:FOSC0 Configuration
bits to select one of these modes:
In HS, HSPLL, XT and XTPLL Oscillator modes, a
crystal or ceramic resonator is connected to the OSC1
and OSC2 pins to establish oscillation.
The oscillator design requires the use of a parallel cut
crystal.
Use of a series cut crystal may give a frequency
out of the crystal manufacturer’s specifications.
An internal postscaler allows users to select a clock
frequency other than that of the crystal or resonator.
Frequency division is determined by the CPUDIV
Configuration bits. Users may select a clock frequency
of the oscillator frequency, or 1/2, 1/3 or 1/4 of the
frequency.
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