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。-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 monitor scan rotation showed that the number of ways.