超星 - 第六章作业--单片机的串行口

单选题

When the serial port of AT89S51 extends the parallel I / O port, the working mode of the serial interface is selected.

A. Mode 0
B. Mode 1
C. Mode 2
D. Mode 3

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单选题

The register that controls the working mode of the serial port is.

A. TCON
B. PCON
C. TMOD
D. SCON

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单选题

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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单选题