前边两讲我们讲了A/D、D/A转换器的原理及其与CPU的连接方法和程序设计。由于计算机的速度相当快,而模拟量被测参数的变化比较慢,所以,一台微型机可供十几～几十个回路使用。但是,微型机在某一时刻只能接收一个通道的信号,因此,必须通 Two front stresses that we talked about the A / D, D / A converter principle and its connection with the CPU method and program design. As the computer’s speed is quite fast, and analog parameters measured changes relatively slowly, so a microcomputer for a dozen to dozens of circuits. However, the microcomputer can only receive the signal of one channel at a time, therefore, must pass