于基51单片机的波形发生器设计--毕业设计.doc

§1.1 选题背景 ..............................................................................2

§2.2 子系统模块方案选择 ...........................................................7

§2.2.1 控制器的选择 ...............................................................7

§2.2.2 调频方案设计 ...............................................................7

§2.2.3 调幅方案设计 .............................................................10

§2.2.4 按键方案设计 .............................................................10

§2.2.5 显示模块方案设计 ......................................................11

§2.2.6 D/A 转换器的选择 .......................................................11

§2.2.7 静态 RAM 的选择 .......................................................12

§2.3 系统总体框图 ....................................................................13

§2.3.1 程控波形发生器系统框图...........................................13

§3.1.3 可编程并行接口电路 8255A .......................................23

§3.1.4 定时器 555 ..................................................................25

§3.1.5 计数器 74161 ..............................................................26

§3.2 设计软件介绍 ....................................................................27

§3.2.1 仿真软件 Proteus.........................................................27

§3.2.2 编程软件 Keil C51 ......................................................28

§3.2.3 EDA 软件 Protel ........................................................28

§4.2 硬件波形发生器设计 .........................................................33

§4.2.1 单片机最小系统及 I/O 扩展模块 ................................33

§4.2.2 波形产生及调幅模块 ..................................................34

§4.2.3 调频模块 .....................................................................35

§4.2.4 SRAM 模块 ..................................................................36

§4.2.5 按键模块 .....................................................................37

§4.2.6 串行通信和供电模块 ..................................................38

第 5 章 系统软件设计 ....................................................................39

§5.1 系统软件编程语言方案设计 ..............................................39

§5.2 程控波形发生器软件设计..................................................40

§5.3.1 主程序 .........................................................................45

§5.3.2 波形子程序 .................................................................46