目 录
1 设计背景 ............................................................1
1.1 SPI 的简介 .......................................................1
1.2 SPI 的应用与特点 .................................................1
1.3 接口信号.........................................................1
1.4 数据传输.........................................................2
1.5 时钟极性和时钟相位...............................................3
2 设计任务与要求 ......................................................4
2.1 设计任务.........................................................4
2.2 设计要求.........................................................4
3 设计方案 ............................................................4
4 SPI 主机接口设计 ....................................................5
4.1 SPI 总线标准 .....................................................5
4.2 SPI 主机功能描述 .................................................7
4.3 单片机扩展 SPI 总线的系统框图.....................................7
4.4 单片机 SPI 总线的时序模拟.........................................9
5 从机的接口设计 ......................................................9
5.1 从机设计原理.....................................................9
5.2 74HC595 资料 ....................................................10
5.3 74HC595 的连接原理图 ............................................13
5.4 16 路开关量输出电路 .............................................14
5.5 模拟量输出电路..................................................15
5.6 整体程序框图....................................................15
6 实验仿真图..........................................................16
7 实验结果分析........................................................16
7.1 16 路开关量输出电路分析 .........................................16
7.2 模拟量输出电路 ..................................................17
8 结论与体会..........................................................17
参考文献...............................................................19
