基于51单片机实现的时钟日历，带dsn电路图仿真。-51 MCU clock based on the calendar, with dsn circuit simulation.

51单片机电子钟，源代码注释详尽，包括实例图片，单片机烧写软件，开发板电路图等等，资源为本人讲座备用！-51 MCU clock, source code comments detailed, including the instance image, microcontroller programming software, development board schematics, etc., reserve resources f