本源码是一次课程设计的，是基于 TLC549 的数字电压表。系统主要包括三大模块：转换模块、数据处理模块及显示模块。电压表的控制系统采用 AT89C51 单片机，A/D 转换器采用 TLC549。单片机对转换的结果进行运算处理，通过一个四位一体的7段数码管显示出来。可以测量0-5V的1路模拟直流输入电压值，误差范围为±0.01V。具有一定的实用价值。

-The source is a course design is based on TLC549 digital voltmeter. The system includes three modules: conversion module, data processing module and display module. Control system voltmeter using AT89C51 microcontroller, A/D converters use TLC549. SCM result of the conversion of the arithmetic processing through a four in one seven-segment LED display. Can be measured in a 0-5V analog DC input voltage value, the error range is 0.01V. It has some practical value.