I'm making a board for a PIC18 microcontroller and have a few
questions about crystal selection. Firstly, on Digi-Key, under the
heading "Load Capacitance," there is the option "Series" and then a
bunch of different capacitor options below that. Will a series crystal
work, or should I get one that uses capacitors? One other question I
have is regarding the crystal frequency. Most PIC18 microcontrollers
(all of the ones I've used, at least) have a PLL built in, so a
variety of different crystals can be used with the same resulting
system clock speed. If the PIC I'm using has a PLL that would allow me
to use, say, a 4MHz, 8MHz, 12MHz, 20MHz, or 24MHz crystal, is there
any reason to use a higher speed crystal as opposed to a lower speed
one?

Appreciate your advice!

Nathan

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