Lpc2000

I have written a pause() fonction under crossworks 1.3 like this :

#define ONE_SEC (uint32t)10000000

void pause(uint32_t duration)
{
  uint32_t startTime = T0TC;
  uint32_t now,temp;

  now=startTime;
  temp=now-startTime;
  while (temp < duration)
    {
	now=T0TC;
	temp=(uint32_t)(now-startTime);
	WDOG();
    }
}

main
{
    Inittimer, ports, etc ....

    while(1)
       {
           pause(ONE_SEC);
           IOPIN^=LED;
       }



Then when i want to use this function , it happens strange things :
the first time I calls pause() , when i set a brekpoint on the
function pause the parameter duration passed has a value of 3248002688
instead of 10000000 !!! But at the second call(and others)
duration=ONE_SEC=1000000 in pause() . So my led blink at the good
frequency of 1s . 
So , what's wrong ??


thanks in advance