题目内容

For ADC0809, which of the following signals indicate that converted data is ready and available? ()

A. START
B. ALE
C. OE
D. EOC

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8051 interrupt service routines are always terminated with the RET instruction. ( )

When the 8051 TMOD register is set with 80H, the Timer 1 can be started by only setting TR1. ( )

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

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

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