Discussion
What is the correct sequence of actions while interfacing an ADC with microprocessor ?
(i) Data ready
(ii) Address enable
(iii) End of conversion
(iv) Start of conversion
Answer: B
The sequence is (ii), (iv), (iii), (i): address enable, start of conversion, end of conversion, data ready.
The microprocessor first places the ADC's address on the bus and enables it, which selects the converter (and, for a multiplexed ADC, the channel). It then sends a start-of-conversion pulse. When the converter finishes it raises its end-of-conversion signal, and the microprocessor then reads the converted data, which is now ready on the data lines.
The other options start the conversion before the ADC is selected, or put end of conversion before the start, which cannot happen.
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