Lpc2000

Yes it was my aim.  I read it here:
http://www.nohau.com/appnotes/arm-thumb.pdf

Correct me if I misunderstood, but it seems that you're compiling in
thumb mode in order to obtain a speed gain. This is wrong. Thumb mode
will decrease the size of your application but will reduce its
performance. Run everything in ARM mode with full optimizations; if this
fails, write the ISR in assembler. If this still fails you'll have to
use a higher clock speed.

Sören_Rennecke <rennecke@...> wrote:
Hi,

What possibilities, are there to increase the performance. 
I need to process many instructions at my UART
interrupt-service-routine. So I get problems at higher Baud rates. 
I use the 14,745 MHz quartz, and don’t want to use the PLL (to save
current); pclk = cclk. 
I compiled the called functions in thumb mode, and optimized the output
with level 3. 
I reached a better performance, but are there other ways to get higher? 

Thanks Sören