这样做的目的在于防止在空闲或者等待状态中锁存进了不想要的指令。当前执行的操作不受影响。
This prevents unwanted commands from being registered during idle or wait states. Operations already in progress are not affected.
用C51程序设置对于控制器的读、写状态的时序，从而实现对于控制器的写指令代码、写数据代码、清屏幕、屏幕滚动功能的操作。
C51 program has been set the schedule of reading and writing status for controller. It can work out some operations of writing instruction code, writing data code, clear screen and roll screen.
在读操作中，如果发出了这个指令，那么两个时钟周期后，读出数据无效，数据总线进入高阻状态。
During a READ operation, When this command is issued, data outputs are disabled and become high impedance after two clock delay.
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