详细说明：1. LED的显示原理： 16×16扫描LED点阵的工作原理同8位扫描数码管类似。它有16个共阴极输出端口,每个共阴极对应有16个LED显示灯-Detailed descr iption: 1. LED display principle: 16* 16 scans the working principle of LED dot matrix with eight scanning digital tube. It has 16 of cathode output port, eac