pic1687的串行DA应用程序C语言模块，采用maplab软件开发，SDI引脚为输入，SCK引脚为输出，简单明了，一看就让初次入手的朋友明白。-pic1687 serial DA application C language module, the maplab software development, the SDI pin is an input, the SCK pin as an output, simple, let the initial start of a friend understand.