目录1 前言 ................................................................................................................................12 单片机概述 ....................................................................................................................22.1AT89C51芯片简介...........................................................................................22.1.1 中央处理器 ..............................................................................................22.1.2 数据存储器 ..............................................................................................22.1.3 管脚说明（P0-P3 口） ...........................................................................32.2 时钟电路和复位电路 .........................................................................................42.2.1 时钟电路 ..................................................................................................42.2.2 复位电路 ..................................................................................................52.3 ADC0808 简介.....................................................................................................52.4 数码管显示原理 .................................................................................................73 系统总体方案及硬件设计 ............................................................................................93.1 设计目的及要求 ...............................................................................................103.1.1 设计目的 ................................................................................................103.1.2 设计任务及要求 ....................................................................................103.2 系统框图 ...........................................................................................................103.3系统总原理图 .............................................................................................
