基于单片机AT89C51设计的时钟，应用于电子手表，万年历等场合-AT89C51 microcontroller-based design of the clock, used in electronic watches, calendar and other occasions

1602液晶屏的pcb原理图，设计电子时钟。附有C51单片机开发程序等。-Schematic diagram of PCB 1602 LCD screen, electronic clock design. With C51 MCU development program.