Lpc2000

--- In lpc2100@yahoogroups.com, "Brian C. Lane" <brian@s...> wrote:

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

Brian,

it is absolutely proper practice to program unused I/O pins to output
with a given level on the LPC2100. Either low or high is possible.
Having unconnected pins as input is probably not the best idea as you
pointed out. 

Bob