说明：定时器2捕获功能的使用。由于只有三个三个数码管，帮只显示捕获的低八位，经验证，当P1.1（T2EX） 用定时器0控制发出一个下降沿，用T2的P1^1；引脚进行捕获，从而得到高电平时间用以测量波形的宽度 跳变时，数据被捕获-STC89S52 microcontroller timer T2 capture

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When outsourcing video contents into the cloud, it is not easy to achieve fine-grained access control especially in timedomain, as the owners of video contents are not able to control their data as on their own servers. The untrustworthy cloud