十进制加法计数器，是通过时钟脉冲来，在四个设置输入端设初始值，在输出端设每到一定的值时就会输出一个高电平-Decimal adder counter clock pulse through the years, in four settings for the initial value of input in each output to a certain set of values when a high output

十进制精确计数，经典写法，便于学习与参考，供大家分享-Decimal precision counts, classic written, easy learning and reference for all to share

一个简单的交通灯程序，实现双向十字交叉路口的交通管理-A simple traffic light program, two-way cross intersection traffic management