键控看门狗程序：

在16383个机器周期内必须至少喂狗一次。

当晶振为11.0592M时在17毫秒内需喂狗一次。

激活看门狗后,喂狗,P2引脚上的LED闪烁发光

激活看门狗后,如果不喂狗,则复位

P0引脚上的LED闪烁发光-Keying watchdog process: In the 16383 machine cycle must be at least feed the dog once. When the crystal is 17 milliseconds 11.0592M domestic feed the dog at once. Activate watchdog, the feed dog, P2 pin on the LED flashing light to activate the watchdog, if not feed the dog, then P0 pins reset LED flashing light on the