个人原创，已经测试通过。功能：完成串行数据与RS232格式数据的收发转换，ST16C450+串并双向转换兼收发时序产生功能，优点：省去了传统的ST16C450需要CPU干预的缺点，简化设计， 纯硬件自动转换，缺点：忽略各种异常报警，适用于误码测试时使用（传输错误由误码测试功能模块完成检测）。,Personal originality, have the test. Function: the completion of serial data and send and receive RS23

试验板上串行口双向通讯 串行通讯就是数据一位一位的传输，数据占据固定大小长度-Test on-board serial port two-way communication Serial communication is one of a data transmission, data to occupy the length of fixed-size