题目内容

The number of operation modes of 8051 UART is ______ . When 8051 UART is set with mode 2, it is a ______ -bit UART with fixed baud rate.

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When 8051 serial port operates in Mode 2, to receive the ninth bit, it should read from ()

A. SM2 bit of SCON register
B. TB8 bit of SCON register
C. RI bit of SCON register
D. RB8 bit of SCON register

How many address signals are generated by 8051 to access external data memory by instruction MOVX @DPTR, A? ()

A. 32
B. 16
C. 8
D. 4

DAC0832 is ()-bit DAC?

A. 4
B. 8
C. 16
D. 32

It is impossible for 8051 to read data from transmitting SBUF. ( )

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