S7-300/400除了为用户提供上面的5种定时器外，用户还可以用CPU系统的时钟存储器（Clock Memory）与计数器来实现精确的定时功能[1]，从而实现定时器数量的扩展。
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CLKMEM Clock Memory 存储器时钟
Memory clock 显存频率 ; 内存频率 ; 显存时钟频率
Memory Clock Mode 内存时钟模式
memory clock driver [计] 存储器时钟驱动器
Effective Memory Clock 有效的记忆体时脉
set memory clock 设置内存频率
Play games against the clock. Timed board games, cell phone, computer and video games help you think quickly, flexibly and pay attention, which boosts memory.
玩有时间限制的游戏。计时的桌面游戏，手机，电脑，视频游戏能帮助你快速灵活地思考，集中注意力，增强记忆。
The services and applications are running, listening, and waiting for the time they are needed by Geronimo, taking up valuable clock cycles from your CPU and hogging transistors in memory.
服务和应用程序实际上在运行、监听，等待Geronimo需要它们的时机，因此占据着宝贵的CPU时钟周期和内存中的晶体管。
Accesses to local store memory can be predicted down to the clock cycle.
对本地存储内存的访问的预测可以精确到时钟周期级别上。
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