学习使用 C8051F1xx 单片机查询方式实现串口通信。使用查询方式实现串口通信。使用串口调试工具向串口发送一个字节的数据，可以观察到串口工具可以接收到刚才发送的数据。-C8051F1xx inquiry learning to use single-chip serial communication means. Way to use serial communication inquiries. Serial debug tools used to send a byte of serial data, can be observed that the tool can receive serial data sent earlier.