Multiple PIC's with 1 crystal

[RussMartin]

Method 3.

Use a CMOS HEX Inverter/Driver IC and build a simple conventional Oscillator (as you would do if you were building a standard non-PIC logic design. Fan this out to heaps of PICs on your PCB as each HEX inverter/buffer stage should be able to fan-out to over a dozen PICs.

My experience with these (both CMOS and TTL) is that, like Method 4, they can generate some interesting RFI, especially on the odd harmonics.

(I mean "interesting" in the sense of the ancient Chinese curse, "May you live in interesting times.")