键盘输入分频发声装置，DSP设计，课程设计说明书-Keyboard input frequency audible devices, DSP design, curriculum design manual

此设计主要包含两大模块：一是DSP之间的串行通讯模块：二是DSP与显示器及键盘的串行显示接口模块-This design mainly includes two modules: one DSP serial communication between the modules: the second is the DSP with the display and keyboard serial display interface module

CH452DS1 DSP或者单片机矩阵键盘手册和程序 -CH452DS1 DSP or microcontroller and procedures manual for keyboard matrix