AWR1642:看门狗问题

各位工程师好，我想请问一下1642芯片看门狗的问题，我将看门狗初始化之后，定时喂狗，但是如果没有喂狗程序将不会复位，反而程序跑飞了，这是怎么回事呢

具体代码如下：

 Watchdog_init();
Watchdog_Params_init(&watchdogParams);
 watchdogParams.resetMode = Watchdog_RESET_ON;
 watchdogParams.debugStallMode = Watchdog_DEBUG_STALL_ON;
 watchdogParams.windowSize = Watchdog_WINDOW_100_PERCENT;
 watchdogParams.preloadValue = 4095;
 watchdogParams.socHandle = gMmwMssMCB.socHandle;
 //watchdogParams.esmHandle = esmHandle;
 /* Open the Watchdog driver */
watchdogHandle = Watchdog_open(0, &watchdogParams);
 if (watchdogHandle == NULL)
{
System_printf ("Error: Watchdog Driver Open failed\n");
}
else {

 System_printf ("debug :Watchdog Driver Open successd\n");
 }

//喂狗函数      
Watchdog_clear(watchdogHandle);