I/O并行口直接驱动LED显示

利用AT89S51单片机的P0端口的P0.0－P0.7连接到一个共阴数码管的a－h的笔段上，数码管的公共端接地。在数码管上循环显示0－9数字，时间间隔0.2秒。

-I/O parallel port directly drive LED display using AT89S51 MCU port P0 is connected to P0.0-P0.7 digital control of a total of yin a-h of the paragraph on the pen, digital tube termination to the public. Cycle control in the digital display on figure 0-9, the time interval 0.2 seconds.