说明：  16字 LED点阵屏+DS1302电子钟 C 程序 1 脚接+5V 2，3脚32768HZ晶振 4脚接地 5脚接S51的P02 6脚接S51的P01 7接S51的P00 8脚接后备电源，可以接老计算机主板上的3.6V电池，也可以通过二级管隔离接一个大容量电解电容 电压在2.5V以上即可维持 595连级输出数据，138行驱动 P1_0为时钟模式转换键、P2_1为时钟加键、P1_2为时钟减键、P2_3为时钟复位键。在对时钟调整时未对调整 项做闪烁处理
(16-character dot matrix LED screen+ DS1302 electronic bell C 1-pin+5 V 2,3 received crystal 32768HZ feet 4 feet 5 feet grounding the S51 then take P02 6 feet of the S51 the S51 then P01 7 pin P00 8 back-up power supply, can access the old computer' s motherboard of 3.6V batteries, can also be isolated by one diode large-capacity electrolytic capacitor voltage in the 2.5V to the maintenance of more than 595 company-output data, 138 firms P1_0 drive mode conversion key for the clock, P2_1 to Clock plus key, P1_2 key for the clock by, P2_3 reset button for the clock. Adjustment of the clock adjustments do not deal with scintillation)