The register that controls the working mode of the serial port is.
A. TCON
B. PCON
C. TMOD
D. SCON
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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
When MCS-51 is used to expand parallel I / O port, the working mode of serial interface is selected ()
A. Mode 0
B. Mode 1
C. Mode 2
D. Mode 3
In serial communication, the registers sent and received in 8051 are ().
A. TMOD
B. SBUF
C. SCON
DPTR
The unit of Porter is ()
A. Characters per second
Bit per second
C. Frames per second
D. Bytes per second
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