interrupt.c

#include "LPC214x.h"
#define PLOCK 0x400


void init(void)
{
    PLLCFG = 0x24;
    PLLFEED = 0xaa;
    PLLFEED = 0x55;
    PLLCON = 0x01;
    PLLFEED = 0xaa;
    PLLFEED = 0x55;

    while (!(PLLSTAT & PLOCK));

    PLLCON = 0x3;
    PLLFEED = 0xaa;
    PLLFEED = 0x55;

    MAMCR = 0x2;
    MAMTIM = 0x4;

    VPBDIV = 0x1;
}

void IRQ_Routine(void)
{

    IODIR0 = 0xffffffff;

    IOSET0 = 0xffffffff;

    for(i=0;i<=100000;i++)
            ;

    IOCLR0 = 0xffffffff;

    for(i=0;i<100000;i++)
            ;


}


void FIQ_Routine(void)
{
    while(1);

}

void SWI_Routine(void)
{
    while(1);
}
int main(void)
{

    init();

    T0TCR = 0x02;
    T0IR = 0xff;
    T0MCR = 0x333;
    T0MR0 = 0x03938700;     // compare hit count

    VICVectCntl0 = 0x00000024;
    VICVectAddr0 = (unsigned)IRQ_Routine;
    VICIntEnable = 0x00001010;

    IODIR0 = 0xffffffff;
    IOCLR0 = 0xffffffff;

    T0TCR = 0X01;    //enable timer0


    while(1);
}