I've used lots of PICs and have never known them "break up" if the crystal is removed. Some of them can actually detect an oscillator fault and switch to a different oscillator.
Leon
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Amateur radio callsign: G1HSM
I know if you are providing clock from function generator and remove it will stop running until clock is provided again. Just like hitting pause on your program.
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Leon
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Amateur radio callsign: G1HSM
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24 bit LCD Breakout Board now in. $21.99 has backlight driver and touch sensitive decoder.
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Ain't gadetry a wonderful thing?
aka G. Herzog [noparse][[/noparse] 黃鶴 ] in Taiwan