Lpc2000

Initialization:

   /* Setting watchdog work mode */
   WDMOD |= WDMOD_WDEN;
   WDMOD |= WDMOD_WDRESET;
     /* Dropping watchdog timeout flag */
   WDMOD &= ~WDMOD_WDTOF;
     /* Setting watchdog timeout */
   WDTC = WatchdogTimeout;

   WDFEED = 0xAA;
   WDFEED = 0x55;

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Reset each cycle:

   WDTC &= ~WDMOD_WDTOF;
     /* Feeding 0xAA, 0x55 to restart watchdog */
   WDFEED = WDFEED_WDFEED(0xAA);
   WDFEED = WDFEED_WDFEED(0x55);

   This code is from our Watchdog driver. We've successfully test it.