请问keil5编程51单片机程序定时器生成PWM，频率50HZ，占空比25%是怎么样的？
https://blog.csdn.net/xianfajushi/article/details/81331101?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522162772789916780366543879%2522%252C%2522scm%2522%253A%252220140713.130102334.pc%255Fblog.%2522%257D&request_id=162772789916780366543879&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2~blog~first_rank_v2~rank_v29-3-81331101.pc_v2_rank_blog_default&utm_term=51&spm=1018.2226.3001.4450