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The second chapter of intelligent instruments exercises
2.4 The microcomputer-controlled double integral A/D conversion system is shown in Figure 2- 1 1. Try to analyze, in the process of double integral A/D conversion controlled by software,

(1) How does the instrument software judge the polarity of the input voltage Ui? How to choose the polarity of UR according to the polarity of Ui?

(2) What is software counting? How to realize software counting of different standards (binary or BCD code)? How to calculate the equivalent counting clock frequency?

(3) How does the instrument software judge the zero-crossing point of the integrator output?

(4) How to replace hardware logic with software programs? What are the advantages of replacing hardware with software? What are the limitations?

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