Not familiar with the TI chip.  However, where is the
switch in your circuit drawing below?  You should be
using one of these...

          +Vcc
            |         switch
            R           |
            |         --'--
port -------o---------o   o---.
                              |
                              |
                             Gnd


OR...


                   switch    +Vcc
                     |        |
                   --'--      |
port -------o------o   o------'
            |
            R
            |
           Gnd



> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of guy
> Sent: Monday, August 26, 2002 10:50 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: keypad
>
>
> Thanks for the feed back.  I did left the input floating.  The
> chip is port6
> of a TI msp430F413.  It doesn't has built-in pull-ups.  Is it right for a
> pull-down to be implemented as the following:
>
>
> port---------|-----[Resistor]------ground
>              |
>              |
>              input
>
> yansong

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics