Lpc2000

> 
> Another question is ....
> 
> I have a commercial FAT12/16/32 file system I would like to 
implent into the
> 2106 it occupies about 40KB of code in an AvR 8bit processor do 
you have any
> idea what that would relate to (in KB) in the LPC ? (disregarding 
the
> compilers optimization) what I mean is ... is 40KB code in an AvR 
the same
> as 40KB code in an LPC ARM ?

This may or may not help, its the only 8-bit uP to ARM/Thumb 
comparison I have to hand.

In another lifetime I had to find a way to remove 80%fsd spikes from 
a flammable gas detector, with less than 200 bytes remaining in the 
ROM space of an 8051 device.

The method I used recorded four history values, and selected the 
closest to the currently displayed reading as the next value to 
display. This worked nicely and also clamped a wandering-zero 
problem. This is obviously a very small example but uses table 
indexing, loops and 16-bit comparisons.

Compiling the function with an early version of Keil's C51 produced 
a 220 byte lump of code. Three hours work produced hand-optimized 
assembly code generating 108 bytes of code.

Some years later, purely for personal interest I compiled the 
original C using the ARM SDT200 compiler - 120 bytes of code. 
Compiling as Thumb code gave 86 bytes of code.

Unless you're doing very simple bit or byte copying with no 
arithmetic and very little decision-making, I would suspect that the 
ARM, or certainly the Thumb code would be more compact than code for 
an accumulator-bound 8-bit micro.

Peter.