在另外的CPU中标记为ON和OFF.不管是怎么标记的，所有钥匙开关的功能如下:闪存保护: 这是标准的硬件功能，可以用来保护闪存不被未经许可的人(这些人没有钥匙)改变，当钥匙开关置于ON的位置，闪存不能被改变(写入)，钥匙开关功能总是有效的，无论下面的这两种配置功能被怎样设置.

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