Lpc2000

Hi Karl,

give us a break, please. There are things we could improve, e.g. the
Flash interface and we did (fastest ARM7 microcontroller running from
Flash). There are things that are just not the major strength of an
ARM microcontroller, port switching is definitely one of them.
Honestly, our LPC900 family can switch a port just about as fast as
the ARM can do. Now, if port switching is the major task, there might
be better options than ARM, however, if it is just one task and you
need to do a lot of algorithms, ARM is a very good choice and it comes
at a price of a high end 8-bit after all.  So, given a similar
performance in toggeling a pin but an order of magnitude better
performance in number crunching, why not use the ARM?

In regards to the 5V / 3.3V discussion, we think it is not really an
issue. In a real system, the 3.3V get often generated from the 5V,
agreed but how does this actually happen. There is a regulator that
tracks the 5V supply and generated the 3.3V.  So by the time the I/O
voltage is around 3.3V, the Vdd should already be somewhere around
2.7V.  This difference does not hurt the device but we are checking
with the pin design group what could happen.

It is difficult to get answers during the holiday time escpecially
when the final answer comes from a different continent. So please bare
with us a little more. 

Happy Holidays, Robert

--- In lpc2000@yahoogroups.com, "dalenkarl" <dalenkarl@y...> wrote:
> 
> 
> > That's not always an option.  Let's say 5V is coming from a 
> switcher.
> > Also, what happens on power down.  Depending on drain currents, 
> 3.3V 
> > (with smaller cap) might discharge before the 5V (with large cap).
> 
> I asumed linear regulating "only".
> 
> For switched systems, well sometimes there is a enable pin
> on the switcher wich can be used with a time delay cirquit.
> 
> Im starting to feel baad about the whole issue, im starting
> to think that this 5v, 3,3v and speed of the io ports are a 
> very bad design error philips have made!
> 
> A CPU that works at 60Mhz with Io that can do at best 2.5-3Mhz????
> I consider this serious crap!
> 
> With this speed in some applications makes 
> the LPC2106 completely useless!! 
> 
> Reg
> KD