PIC24EP512 - Read on D0 w/5.1K pull-up reads low

[temtronic]

yeesh Ben, this is frustrating for me...have you ANY hair left ??
Maybe toss the boards outside at noon today, supposed to be 40*C !!!
Wish I could offer a 'rabbit out of my hat' but can't think of anything as to WHY the 'odd' behaviour....

[Ttelmah]

So, add BROWNOUT, and see if it makes any difference.

The point is that the erratum says the chip must have BROWNOUT enabled,
but doesn't say what happens if it isn't....

[benoitstjean]

Ok, that would be very strange but I will add it. I know at the moment that if a brownout occurs, when the PIC boots, it checks the restart code and pops me a message on a console so when a brownout does occur, then it will indicate that the reboot was due to a brownout.

So now the question is BROWNOUT part of the problem even though I do get the "brownout" CPU restart code?

[temtronic]

OK, dumb questions, looking for a rabbit for you...

Are all the PCBs from the same batch ? IE NO revisions, NO new traces, bad etches.

Does the pin actually work as an output normally ? correct voltages ?

Any other 'peripheral' magically attached to it by 'default' ?

[benoitstjean]

Yep, same PCB batch, I haven't tested the pin as an output yet but given it doesn't cause me too much grief other than the fact I don't understand what is going-on, I found a way through the code to bypass this problem.

Thanks.

Ben