Lpc2000

----- Original Message ----- 
From: "embeddedjanitor" <manningc2@...>
To: <lpc2000@yahoogroups.com>
Sent: Sunday, April 10, 2005 3:12 PM
Subject: [lpc2000] Re: port timing


> --- In lpc2000@yahoogroups.com, "Gennady Palitsky" <gennadyp@j...>
> wrote:
>> So it seems that the BEST result I can get with loading consecutive
> data
>> from flash and storing at a port is 10 cycles...
>> (what with my 14.318MHz clock is ~230nS, actually a bit more then 3.
> 7MHz).
>
> That's about right.
>

I put on a board 17.73MHz crystal and with direct store from registers to 
GPIO got port toggle frequency
of ~7.6MHz. I believe that 20MHz crystal (don't have one) will give ~8.6MHz 
toggle.
Though extra 5 cycles at STR is still there, the port frequency is way above 
originally mentioned 3.7MHz.
Does it mean that something changed on LPC2138 ?

Gennady