：这个范例说明如何使用8051 的Port 1连接到四颗七段显示器，PORT 0的低4位分别控制这四颗共阳七段显示器，让四颗共阳七段显示器使用扫描的方式轮流显示数字。这四颗七段显示器将显示出自数字时钟PORT 2的P2.0和P2.1分别连接到2个弹跳按钮。-: This example illustrates how to use the 8051 to connect to the Port 1 Seven-Segment Display 4, PORT 0, low 4 a total of 4, respectively, to control the Seven-Segment Display Yang, so that a total of four seventh-yang way monitor scan rotation showed that the number of . 4 Seven-Segment Display This will display the digital clock from PORT 2 of the P2.0 and P2.1, respectively, connected to the two bouncing button.