题目内容

When the serial port of 8051 single chip microcomputer is in working mode 0, ().

A. The data is input from RDX and output from TXD
B. The data is output from RDX and input from TXD
C. The data is input or output from RDX, and the synchronization signal is output from TXD
D. The data is input or output from TXD, and the synchronous signal is output from RXD

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