3.4.2 滤波器芯片UAF42 简介······························································ 39 3.4.3 滤波器设计计算··········································································· 39 3.5 本章小结·························································································· 40 第4 章数字信号处理的设计与实现··························································· 41 4.1 A/D 转换电路的设计········································································ 41 4.1.1 模/数转换的性能指标································································· 41 4.1.2 模/数转换器的选择要点····························································· 42 4.1.3 模/数转换器ADS7824 的功能简介············································· 42 4.2 微控器的选择及其部分外围电路的设计··········································· 46 4.2.1 单片微控器的选择······································································· 46 4.2.2 AT89S52 的引脚功能·································································· 48 4.2.3 微控器的时钟电路······································································· 51 4.2.4 复位电路和“看门狗”技术························································ 51 4.3 可编程IO 口扩展的设计··································································· 52 4.3.1 8255A 的引脚和结构简介···························································· 52 4.3.2 8255A 的三种工作方式及其主要功能········································· 53 4.3.3 数码显示及键盘的设计路···························································· 54 4.4 数据存储器的选择及空间分配·························································· 55 4.5 本章小结·························································································· 56 第5 章软件的设计思想与实现 ·································································· 57 5.1 软件设计思想···················································································· 57 5.1.1 系统软件所实现的功能······························································· 57 燕山大学工学硕士学位论文 VI 5.1.2 软件设计的主要思想··································································· 57 5.2 主程序流程图···················································································· 58 |
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