目录
一、系统设计要求及方案选择···················································2
1.1 系统设计题目及要求··················································2
1.2 波形产生方式选择····················································2
1.3 整体功能实现方案····················································2
二、功能及指标说明···························································2
2.1 主要功能介绍························································2
2.2 主要数据指标························································3
三、系统所用硬件介绍及 proteus 接线图··········································3
3.1 系统所用硬件介绍····················································3
3.1.1 89c51 单片机概述···············································3
3.1.2 8279 芯片概述··················································4
3.1.3 DAC0832 芯片概述·············································5
3.1.4 6264RAM 芯片概述·············································5
3.1.5 74LS138 芯片概述··············································6
3.1.6 数码管概述····················································6
3.2 各部分 proteus 接线图·················································6
3.2.1 8279 键盘及显示模块············································6
3.2.2 DA 转换模块···················································7
3.2.3 外扩 RAM 模块················································7
3.2.4 单片机与各部分连接图··········································8
四、系统软件设计及仿真结果···················································8
4.1 整体流程图··························································8
4.2 各部分程序及仿真结果················································9
4.2.1 程序主要部分·················································9
4.2.2 8279 键盘显示程序············································9
4.2.3 正弦波程序及仿真············································10
4.2.4 三角波程序及仿真············································11
4.2.5 锯齿波程序及仿真············································12
4.2.6 方波程序及仿真··············································13
4.2.7 外扩 RAM 程序··············································13
五、设计过程遇到的问题及解决办法············································14
六、拓展功能··································································14
6.1 频率极限报警功能··················································14
6.2 PC 电脑端控制·····················································15
七、设计心得体会····························································18
参考文献····································································19
附录········································································19
附录 1：proteus 整体图·······················································19
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