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【单选题】
MCS—51单片机串行口接收数据的次序是下述的顺序（）（1）接收完一帧数据后，硬件自动将SCON的RI置1（2）用软件将RI清零（3）接收到的数据由SBUF读出（4）置SCON的REN为1，外部数据由RXD（P3．0）输入
A.
（1）（2）（3）（4）
B.
（4）（1）（2）（3）
C.
（4）（3）（1）（2）
D.
（3）（4）（1）（2）
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