Use the procedure modification PC the high a word to makes it combined with P1 to realize to pick up 8 LEDS display and combines to realize to the port of P3 to connect to the keyboard matrix.
However, the users always need a fast response. Why don't we connect the keyboard to a parallel port?
然而，用户们总是希望得到最快的响应，那么我们为什么不把键盘连到计算机的并行端口上呢？
3
In the aspect of man-machine communication, we use the improved reused keyboard of I/O port to implement the users' data input, and displaying the temperature by two numeral displayers.