有FT的引脚，表示可接受5V电压。
1.1GPIO工作方式
参考帖子：
https://blog.csdn.net/k666499436/article/details/123845466?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522168957959916800182714620%2522%252C%2522scm%2522%253A%252220140713.130102334..%2522%257D&request_id=168957959916800182714620&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2~all~top_positive~default-1-123845466-null-null.142^v88^control_2,239^v2^insert_chatgpt&utm_term=gpio%E7%9A%848%E7%A7%8D%E5%B7%A5%E4%BD%9C%E6%A8%A1%E5%BC%8F&spm=1018.2226.3001.4187
1.2GPIO相关配置寄存器
标签：E5%,2522%,E7%,blog,工作,原理,GPIO,id From： https://www.cnblogs.com/fengzhihean/p/17560845.html