12位的AD转换，采用的芯片为TLC2543. 该程序已调试通过，含义详细的源代码及PROTUSE仿真电路-12 of the AD conversion, the chip used for the TLC2543. Debugging the program has passed, meaning the source code and detailed circuit simulation PROTUSE

带4*4键盘的89C51单片机串行通信系统，其中包括了Proteus的仿真电路-4* 4 keyboard with the 89C51 single-chip serial communication system, including circuit simulation Proteus