xilinx ML507官方评估板的电路原理图和配套1602液晶的datasheet，适合工程人员参考-Xilinx ML507 official uation board circuit schematic and supporting 1602 liquid crystal datasheet for engineering reference

Altium Designer设计的基于51的最小系统，主要包括RS485控制器，温度传感器，51单片机，晶振，复位等功能模块-Altium Designer designed 51-based minimum system, including RS485 control, 51 single-chip, crystal, reset and other functional modules

常用的有源晶振封装库和原理图库，AD环境。(AD environment commonly used active crystal package library and schematic library)