题目内容

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

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8051 Timer 0 can be used as the baud-rate generator. ( )

The TI flag is set by serial port hardware at the completion of receiving of a byte. ( )

The P2 port of 8051 can be used for general I/O or as the high byte of the address bus for access external memory with MOVX instruction. ( )

How many address signals are generated by 8051 to access external data memory by instruction MOVX @R0, A? ()

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