基于单片机并行口的电子钟的设计,多功能电子表原理框图、原理图、PCB图及程序-Microcontroller-based parallel port electronic clock design, multi-function electronic watch block diagram, schematic, PCB plans and procedures

多功能数字电子表的总电路图，PDF格式,基于51单片机-Total Circuit multifunction digital electronic tables, PDF format