"Honey, my PIC ADC pin sagged my peak detector voltage!"

[HankMcSpank]

Hank,

Weak Pull-ups are disabled at power-up / Reset.
They are turned on by clearing WPUEN (OPTION_REG.7).
All of the WPUx registers are enabled at power-up, so when you clear the WPUEN bit, they all come on unless you specifically disable individual pins WPUC.x.

Does your code change OPTION_REG?

Hey Darrel,

this is the point in the proceeedings where I should lie profusely, but nope....

"It's a fair cop guv"

Yes, I do use WUPs on PORT B, so yes I have...

OPTION_REG.7 = 0

....which of course, then means all ports are enabled & I need to disable by port.

My excuse is that my code is a heavy cut/paste from a former program, so I didn't enter every single line manually......but, that's lame so I offically declare myself a pleb.

Great spot....... & thanks for chiming in to correct.