题目内容

The ADC0809 chip is 8-channel ADC, it can monitor multiple inputs, but only one input at a time. ( )

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

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.