AT89S51中的内部看门狗程序实现

#include

sfr WDTRST = 0xA6;

int Dog_Count=0;
void Clr_WDT();
void delay_50us(unsigned int t);

int main()
{
TMOD=0x11;
TH0=0x3C;TL0=0xB0;　　//50ms
TH1=0xFC;TL1=0x18;　　//1ms
ET0=1;ET1=1;
EA=1;
TR0=1;TR1=1;

Clr_WDT();

while(1)
{
Dog_Count=0;
}

return 0;
}

void Clr_WDT()
{
WDTRST = 0x1E;
WDTRST = 0xE1;
}

void IntTimer0 () interrupt 1
{
TH0=0x3C;
TL0=0x0B0;
}

void IntTimer1 () interrupt 3
{
if(Dog_Count<5000)
Clr_WDT();
Dog_Count++;
TH1=0xFC;
TL1=0x18;
}