It is merely necessary to select a baud-rate and possibly other options (number of stop bits, parity, etc.) and load (or read from) the serial transmitter (receiver) buffer.

• 用户只需要选择少数几个选项，例如波特率、停止位、奇偶校验方式，然后向串行发送（或者接收）缓冲区发送（或者读取）数据。