IC660EBD101

IC660EBD101

IC660EBD101

   异步传输方式中，字符是数据传输单位。在通信的数据流中，字符间异步，字符内部各位间同步。异步通信方式的“异步”主要体现在字符与字符之间通信没有严格的定时要求。异步传送中，字符可以是连续地、一个个地发送，

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也可以是不连续地，随机地进行单独发送。在一个字符格式的停止位之后，立即发送下一个字符的起始位，开始一个新的字符的传输，这叫做连续的串行数据发送，即帧与帧之间是连续的。断续的串行数据传送是指在一帧结束之后维持数据线的“空闲”状态，新的起始位可在任何时刻开始。一旦传送开始，组成这个字符的各个数据位将被连续发送，并且每个数据位持续的时间是相等的。接收端根据这个特点与数据发送端保持同步，从而正确地恢复数据。收/发双方则以预告约定的传输速率，在时钟的作用下，传送这个字符中的每一位。

       握手信号实际上是控制信号，用来控制数据的传送。通过握手信号，发送方可以通知接收方是否有数据要发送。接收方通过握手信号通知发送方它是否已经准备好了接收信号。握手信号遵循某种协议。

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