Lpc2000

--- In lpc2000@yahoogroups.com, "lpc2100_fan" <lpc2100_fan@...> wrote:
>
>  
> > > Hi Leon,
> > > 
> > > the newer versions with fast I/O can not toggle as fast as the
> > > instruction rate, true, but half as fast!  So you can get a pin
> > > toggled every other clock cycle resulting in a possible output
> > > frequency of e.g. 60/4 = 15.
> > > 
> > > I happen to know that many people compare this to the AVR ;-) 
You
> > > would need a 30 MHz AVR to do this.
> > > 
> > > Bob
> > >
> > Newer AVRs can toggle a pin in 1 cycle ;-) Aren't comparisons 
> > wonderful.
> > 
> > Jim
> >
> Hello Jim,
> 
> exactly what I wrote. To get a frequency of 60/4 you need to toggle
> TWICE in 4 clocks. If you tell me that a 16 MHz AVR can generate 
more
> than 8 MHz output that would really be news to me because that would
> be 2 instructions in one cycle, a superscalar AVR8. 
> 
> Please no offense, I think it was only a misunderstanding in 
wording. 
> And still the ARM needs 2 cycles to toggle a pin while the AVR does 
it
> in one, it's just a fact that the ARM can almost run four cycles
> before the AVR is done with one. 
> 
> The only reason I am comparing this to the AVR because the older
> devices which needed 8 cycles to toggle a pin were actually slower 
in
> toggeling than a 16 MHz AVR and that has been a major complaint in
> this forum back then. 
> 
> Bob
>
Hello Bob,

No offense taken, I simply, as you say, misunderstood what you meant. 
Anyway it's good to see that newer LPCs can produce some reasonable I/
O toggle rates, something that put me off them at first.

Jim