文件名称:volatile
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volatile的作用volatile的本意是“易变的”
由于访问寄存器的速度要快过RAM，所以编译器一般都会作减少存取外部RAM的优化。比如：
-The role of volatile volatile are intended to be " volatile" registers as faster access than RAM, so the compiler will generally be optimized to reduce access to external RAM. For example:
由于访问寄存器的速度要快过RAM，所以编译器一般都会作减少存取外部RAM的优化。比如：
-The role of volatile volatile are intended to be " volatile" registers as faster access than RAM, so the compiler will generally be optimized to reduce access to external RAM. For example:
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volatile.doc