Lpc2000

The fastest way is with spi FRAM like FM25L256 (up to 25 mhz clock) 
But in a lpc21xx if i'm right, SPI is limited to clk/8 or 7.5 mhz for an  
internal freq of 60Mhz.
For a FM25L256 (32k*8) 8 pins it's quite 750Ko/s storege in sequential  mode.
I apologize for a mistyping in my previous message about chip  reference.
 
SPI read write routine is as simple as that
 
unsigned char _getput_spi(unsigned char mydata)
{
rSP0DR =  mydata;                 // send mydata byte
    while ((rSP0SR&0x80) == 0); // wait for data  transfer complete
    return  rSP0DR;                      // return read byte  
}




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