什么是non-critical circuits？

lifcy

只听说过操作系统中临界代码，电流怎么也有临界电流？
文档中整段话如下：[
The system context is maintained in system DRAM, but power is shut off to non-critical circuits. Memory is retained, and refreshes continue. All clocks stop except RTC clock.
麻烦各位大侠帮帮忙。

LABE

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二 三极管不也是有临界电压嘛！