题目内容

Any pin of 8051 ports must output logic ______ to enable the pin to read the input.

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The EOC output of ADC0809 remains logic ______ throughout the AD conversion time.

Which of the following signals is used to generate the reading strobe for external data memory, interfaced with 8051 microcontroller? ()

A. /RD
B. /PSEN
C. /WR
D. /EA

The 8051 can serve interrupt sources, and memory address in the interrupt vector table is assigned to external interrupt 0.

The relation {(2, 4), (4, 2)} on the set {1, 2, 3, 4}, is transitive? ()

A. Yes
B. No