Yes, whenever possible - which is most of the time. YMMV.
Yes, whenever possible - which is most of the time. YMMV.
I used to use crystals, preferably 20-40MHz way back when (10-15 years).
But today, internals at max speed all the time.
My Creality Ender 3 S1 Plus is a giant paperweight that can't even be used as a boat anchor, cause I'd be fined for polluting our waterways with electronic devices.
Not as dumb as yesterday, but stupider than tomorrow!
Unless you need the utmost critical timing.
For any other application, even USART at 115Kbps, internal HS Osc works just fine.
Ioannis
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