Tony,

 In my previous post regarding this post, I said Negative feedback.
 I meant to say Positive feedback'.   I was thinking of something
 else while writing.  And I shouldn't do that.

                                                 Regards,

                                                   Jim


> Hi,
>
> I use PIC16C74 and set the port D as input. But it behaves as output,
> eliminating all the input signals. The spec. says that they are schmitt
> trigger inputs. What are "schmitt trigger input"? How to make the port
> as a "regular" input?
>
> Thanks.
>
> Tony
>
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