8051 与1602液晶，软件定时可随意调节时分秒。3个按键-8051 and 1602 LCD and software are free to adjust from time to time when minutes and seconds. 3 keys

The DS12887 Real Time Clock plus RAM is designed to be a direct replacement for the DS1287. The DS12887 is identical in form, fit, and function to the DS1287, and has an additional 64 bytes of general purpose RAM. Access to this additional RAM sp