题目内容

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

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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

In the CPU, the registers that reflect the running state of the program or some characteristics of the operation results are ()

A. PC
B. PSW
C. A
D. SP

The function of the 9th data bit of serial port communication can be defined by the user.

A. 对
B. 错