Lpc2000

> >But, you haven't told us the important stuff: what crystal 
frequency,
> >what PLL setup (for a 14.7456 MHz crystal, PLLCFG=0x23 works), what
> >MAM setup (MAMCR=0x02 and MAMTIM=0x04 works) and what VPBDIV (0x01 
works).

Oops.. I knew I forgot something.

I'm running using an external crystal of 14.7456 MHz.  VPDIV = 0 
default -> one fourth of the processor clock.   I'm using the 
following code snippet for setting up the PLL and MAM:

// PLL
PLLCFG = 0x23;    // M = 4 P = 2 -> FOSC x 4 = 58980000(cclk)
PLLFEED = 0xAA;
PLLFEED = 0x55;   // PLL feed sequence
PLLCON = 0x1;     // habilita PLL e conecta PLL
PLLFEED = 0xAA;
PLLFEED = 0x55;   // PLL feed sequence

while( !(PLLSTAT & 0x400) );    // wait for PLL lock

PLLCON = 0x3;      // Connect PLL 
PLLFEED = 0xAA;
PLLFEED = 0x55;    // PLL feed sequence


// MAM

MAMCR = 0x00;
MAMTIM = 0x02;     // 2 processor clocks in duration for fetch cycles
MAMCR = 0x02;

I don't know if its relevant, but I'm using the IAR compiler (version 
4.30) to develop.

> also look at the support routines in the newlib-lpc lib for an 
example that 
> takes the crystal frequency and desired operating frequency as 
inputs and 
> set the PLL registers accordingly.  That might give you a double 
check on 
> your values.
> 
> Robert

Thanks, I'll check that out.

Karl