源：

 

AWU的应用（用库函数完成的）

//切记要开启中断　且在中断函数中 AWU_GetFlagStatus();　来清除中断void AWU_SET(void){    CLK_PeripheralClockConfig(CLK_PERIPHERAL_AWU, ENABLE);    AWU_Init(AWU_TIMEBASE_12S);}#ifdef _COSMIC_@far @interrupt void AWU_IRQHandler(void)#elsevoid AWU_IRQHandler(void) interrupt 1#endif  {    AWU_GetFlagStatus(); }

 

IWDG应用（直接操作寄存器完成的）　

在需要清狗的地方调用WDT_CLR()即可

void WDT_CLR(void ){    IWDG->KR = IWDG_KEY_REFRESH;}void START_WDT(void ){    IWDG->KR =0X55;//打开保护    IWDG->PR = IWDG_Prescaler_256;//　28Khz 256分频　    IWDG->RLR = 254;//重载寄存器设定　每当喂狗时　此值就会重载    IWDG->KR = IWDG_KEY_REFRESH;//先喂一次    IWDG->KR = IWDG_KEY_ENABLE;//启动看门狗}

 

WWDG应用

WWDG-CR是向下的计数器，数到0x40就会复位，窗口的上限可以任你设，最大7F，如果设成7F，几乎就成了没有窗口的看门狗了。　

窗口的意思是假如你设是0x60,那么只有在0X60-0X40间可以喂狗，其它时间喂，狗就会复位你的单片机，所以喂狗前要先判断狗饿否。

typedef unsigned char     uint8_t;void WWDG_Init(uint8_t Counter, uint8_t WindowValue){     //assert_param(IS_WWDG_WINDOWLIMITVALUE_OK(WindowValue));        WWDG->WR = WWDG_WR_RESET_VALUE;    WWDG->CR = (uint8_t)((uint8_t)(WWDG_CR_WDGA | WWDG_CR_T6) |  (uint8_t)Counter);    WWDG->WR = (uint8_t)((uint8_t)(~WWDG_CR_WDGA) & (uint8_t)(WWDG_CR_T6 | WindowValue));}#define BIT_MASK          ((uint8_t)0x7F)void WWDG_SetCounter(uint8_t Counter){    WWDG->CR = (uint8_t)(Counter & (uint8_t)BIT_MASK);}#define window_max 0x60#define wwdg_reset 0x70void WWDG_CLR(void){
    //狗饿否     if ((WWDG->CR)&0x7f)< window_max)WWDG_SetCounter(wwdg_reset)  ;}main(){    WWDG_Init(wwdg_reset,window_max );    while(1)    {        WWDG_CLR    }}