其实用74HC595也是一种动态显示，所以必须利用循环才行。

运用74HC595串入并出的方式显示8位共阴数码管,本实验是用P2.0,P2.1,P2.2

利用看门狗定时器，实现电子表。即：数码管第4位显示时，第5.6位显示分

最后7，8显示秒。并且利用DS18B20温度传感器，在最高三位显示温度。-Actually with 74 hc595 are needed is also a kind of dynamic display, so must use cycle.

Using series with 74 hc595 are needed and the digital tube display 8, a total of Yin, this experiment is to use P2.0, P2.1 and P2.2

Using the watchdog timer, electronic watch. Fourth: the digital tube display, display 5.6 points

The last 7, 8 seconds. And using DS18B20 temperature sensor, in the three highest temperature.