PeterO wrote: ↑
Tue Dec 10, 2019 7:54 pm
Since it isn't show in the diagrams how can you be so sure ?. And if was after the charge/discharge times would be a major limiting factor !
AFAICS it is shown. Any capacitance would be associated with the 'logic' part, not the pin. Capacitance at the pin (driven) end of this resistor would be of little interest. However even tiny pf on the other (logic) side of 100meg, as shown, would create dramatic delays.
For beginners maybe best to say inputs behave like there's nothing there. Pi outputs, on the other hand, do act like resistors (few hundred ohms) up or down. IMO more useful than scare monger threats that if you go 1 microvolt above 3.3v the board will explode. But like with giggles, apparently just me.