Originally Posted by
skimask
From above link: "...Many microcontrollers have this resistor internally and may have different values for different frequency operations. If so, then the external resistor is not needed."
Pretty much every PIC data sheet i've looked at indicates that this resistor is internal to the PIC. (e.g. PIC18F4550 data sheet pg. 24).
So I guess all of the circuit diagrams that indicate to add this resistor externally for a PIC would be incorrect (or in the very least, redundant).
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