例如，编译器为了优化一个循环索引变量，可能会选择把它存储到一个寄存器中，或者缓存会延迟到一个更适合的时间，才把一个新的变量值存入主存。

For example, a compiler may choose to optimize a loop index variable by storing it in a register, or the cache may delay flushing a new value of a variable to main memory until a more opportune time.

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地址总线被处理器用来选择在特定外设中的存储器地址或寄存器。

The address bus is used by the processor to select aspecific memory location or register within a particular peripheral.

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在size下拉列表中，选择最小值(256)——小uart实际上只有4个32位寄存器，因此只需要16字节的地址空间，所以256个字节绰绰有余。

In the Size drop-down list, select the smallest value (256) — the lite UART actually has only four 32-bit registers, and hence only requires 16 bytes of address space, so 256 bytes is plenty.

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