C51编写的基于单片机的秒表时钟设计。包括原程序及原理图和PCB设计。-C51 prepared by the stopwatch clock based on single chip design. Including the original program and the schematic and PCB design.

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