Lpc2000

Thomas Weber wrote:
> Could it be, that i have to pull-up all gpio-pins, i want use?
> 
> I have a pull-down on a gpio-pin, because the wire is normally on low, but
> the wire is never on a high  level. 
> 

Is it an input or an output? What's the value of the pull-down? You may 
be pulling it down too hard, depending on what is driving the line.


This also brings up a new question, what's the proper configuration for 
unused GPIO pins? One he MSP430 I set unused pins to outputs with a 0 
level on them, is this acceptable practice for the LPC21xx parts? I only 
see some of the GPIO pins (associated with the TRACE support) have 
internal pullups, so that would lead me to think that leaving the others 
  as inputs and unconnected wouldn't be a bright idea.

Brian

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Brian C. Lane (W7BCL)                      Programmer
www.shinemicro.com   RF, DSP & Microcontroller Design