Lpc2000

I found that 1K works well running clock rates of 400K.  Anything larger 
caused slow rise times.


John Stamos wrote:

> Can someone recommend a good resistor value to use for the pullup 
> resistor?
>  
>   Much Thanks.
>
> Robert Adsett <subscriptions@...> wrote:        At 
> 06:36 PM 5/20/06 +0000, jstamos111 wrote:
>   >Hey guys,
>   >
>   >This problem has me completely baffled.  Hopefully you can help.
>   >
>   >I have an LPC2106 running on a board of my own design and am using
>   >Keil tools to compile the code.  Here's my very short code:
>   >
>   >void main() {
>   >PINSEL0 &= 0x00000000;
>   >IODIR0 = 0xFFFFFFFF;
>   >IOSET0 = 0xFFFFFFFF;
>   >while(1);
>   >}
>   >
>   >The problems when I run this code all IO ports turn on except P0.2,
>   >P0.3 and P0.26.  Any idea why?  I tried looking in the documentation
>   >but couldn't find anything specific about these ports not working for
>   >IO.  I thought maybe the problem was what I had the pins connected to
>   >(a CPLD) so I made sure to put the connected CPLD pins as inputs and
>   >even disconnected one pin completely and still the same problem.  I
>   >have multiple boards and it does it for at least two of them.
>  
>   Well P0.2 & P0.3 are open collector so they'll need pull-ups.  See
>   http://www.open-research.org.uk/ARMuC/LPC2100Tips.html
>  
>   P0.26 I don't see anything off hand unless you have JTAG enabled.
>  
>   Robert
>  
>   " 'Freedom' has no meaning of itself.  There are always 
> restrictions,   be
>   they legal, genetic, or physical.  If you don't believe me, try to 
> chew a
>   radio signal. "  -- Kelvin Throop, III
>   http://www.aeolusdevelopment.com/
>  
>                  
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