往QX-MCS51开发板的AT24C02内任意一个单元写数据，开发板上电后首先读取此单元的原有的数据，然后赋给程序中的计数变量，计数变量再以5秒的速度+1并且写入AT24C02，当计数大于99时清零再写，用数码管显示。-To QX-MCS51 development board AT24C02 arbitrary a unit to write data, development board after the first read the original data of the unit and Fu to count variables in the program, the counter variable to 5 seconds speed+ 1 and write AT24C02. When the count is greater than 99 cleared to write, with digital display.