Problem with LPC 2101 with generating Fix delay..

i have proble with generating 1Sec delay..coe is below ..i have used 12Mhz crystal

#include "LPC21xx.H"

void delay(void);
void init_clock()
{

        PLLCON=0x0;      // the PLL is nt connected as the clock source for the processor
        PLLFEED=0xAA;
        PLLFEED=0x55;
        VPBDIV=0x00;//Pclk =12Mhz
        MAMCR = 0x00;           // Any MAM function is disabled..i.e
}
/*      the prescaler register is set to have the value 9999(=0x270f),so that the TC register is
        incremented after every 10000 clock cycles.So it should count upto 1200(=0x4B0) for 1sec delay with 12MHz supply as the Pclk.
*/

void delay()
{
        T0PR = 0x0000270F;
        T0MR0 =0x000004B0 ;
        T0TCR =0x00000002; // the timer0 is activated
        T0TCR =0x00000001; // the timer0 is activated
        while(T0TC != T0MR0);
        T0MCR = 0x00000002;
// Timer Counter will be in reset condition if the match between the MR0 and TC happens.
        T0TCR = 0x02;  // when the match happens the Timer0 is resetted and it is again activated
                 while the next delay is called

}  // with 12MHZ clock supply the time delay is cmng as 1sec if the delay value is 250000
// in this

void main(void)
{
        unsigned long dword=0xffffffff;
        unsigned char min_hand=0;
        init_clock();
        PINSEL0 &= 0x00000000; // all the pins of port1 are selected as GPIO
        IODIR0 = 0xFFFFFFFF;   // the pin 16 to 23 are configuered as the o/p pins.
       // IOCLR1 =  0xFFFFFFFF;
        while(1)
        {

               IO0CLR=dword;
               delay();
               IO0SET=dword ;
               delay();
        }

}