Lpc2000

Hello Peter,

I know what is a slew rate, do not worry about that and I had found
this figures but I just wanted to know if the term __control__ in slew
rate control extracted from the user manual signified that there is a
way to change it
Because as you probably know, changing this value could be very
interesting regarding CEM...

Regards

--- In lpc2000@yahoogroups.com, Peter Jakacki <peterjak@...> wrote:
>
> How did you interpret the specs to say that you could have slew rate 
> control????
> 
> The "data sheet" covers the static and dynamic electrical 
> characteristics of the device but like most common digital devices
these 
> figures are fairly normal. 10ns is given as the typical rise and fall 
> time of the outputs "as measured", not guaranteed, and certainly not 
> programmable.
> 
> ------------------ DATA SHEET EXTRACT ---------------------
> PORT PINS              min typ max Unit
> tr(o) output rise time -   10  -   ns
> tf(o) output fall time -   10  -   ns
> 
> Typical ratings are not guaranteed.
> The values listed are at room temperature (+25 °C), nominal supply
voltages.
> --------------------------------------------
> 
> Although you are welcome to ask questions it will help you to read and 
> compare data sheets for other chips and digital logic in general etc. 
> Try thinking about it a little more before being tempted to ask a 
> question. The answers you find yourself tend to be far more valuable 
> than the ones handed to you. You can be taught a lot of things but you 
> only really learn and understand when you "nut it out". It's a bit like 
> being a passenger in a car traveling to somewhere where you have never 
> been before and then not being able to find the place again by
yourself. 
> But once you do find it, it's like this clear mental picture that's 
> locked in your mind enabling you to vary the route and still get there.
> 
> *Peter*
> 
> croquettegnu wrote:
> > I have read in the LPC214x user manual that some I/O could have 10 ns
> > slew rate control.
> > Does it mean that their slew rate can be configured ? because I have
> > not found any registers that could allow to configure the slew rate of
> > each I/O functions...
> >
> > That could be an interesting feature but I'm sure to have correctly
> > understood
> >
> > Any helps appreciated!!!
>