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在28335的SCI-LOOPBACK实验中，为什么只的单单看到SciaRegs.SCITXBUF里面有数据，看不到SendChar和ReceivedChar里面有数据？这个实验的数据是怎么发送的？
SendChar和ReceivedChar本身就是数据，SendChar是发生的数据，ReceivedChar是SCITXBUF中接收到的数据。
喔，就是说它们是在观察窗口上看不出具体的值。
