Jeff DeMaagd wrote:
>
> I am using a 16F877 chip, and I am trying to use all of port b as an input.
> Right now I am having problems with pin RB6.  The data sheet says it's used
> for in-circuit debugging but I have that feature turned off, just like I
> have low voltage programming turned off.
>
> If I turn the input voltages for pins 5,6 & 7 off (0V) at the same time, RB6
> manages to go down with the others but within 5 seconds RB6 drifts back high
> again, and if I switch either RB5 or RB7, the pin input data gathered is
> more likely to change than with switching the input at RB6 itself!  I am
> using a DIP switch and I have tried it in pull-up and pull-down
> configurations with 4.7k resistors.
>
> I am using the uChip Picstart Plus & MPLAB software, it says I have the LVP
> and debugging turned off.
>
> Am I overlooking something?  I can't find much in the datasheet.
>
> Thanks
>
> Jeff

Are these pins set as inputs or outputs. You seem to want to write data
to them, but also have switches connected.

It sounds like RB6 is a floating input.

--
Best regards

Tony

mICros
http://www.bubblesoftonline.com
mailto:sales@bubblesoftonline.com

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