Why using PLL in LPC-2294 ?

Development Boards MicroMod
1

Hi,

I am using Olimex LPC-E2294 board with crystal oscilliator 14.745 MHz on board, and I also use Rowley’s CrossWorks compiler with its sample(BSP) code.

I realize the sample code enable PLL and set cclk to 58.9824MHz, it is processor clock frequency. If I disable PLL, then cclk = 14.745MHz.

My question is

(1) Why need PLL ? just to get a high clock frequency ? or there are some other reasons ?

Thanks.

Kind regards

Daniel