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Originally Posted by Jay Lundy
Actually the pull-ups are internal to the PIC. You can disable them using a register.
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Well, yes and no. The 18F8520 does have programmable weak pull-ups, but only on port b, which is mapped to digital I/O pins 1-6 on the FRC-RC and interrupts 1-6 on the EDU-RC. IFI has also included 100K pull-ups on most, if not all, I/O pins.
-Kevin