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关于 STM32F411 Stop Mode下 Flash 的两种模式，应可分别如下述方式来操作进入：
Bit 9 FPDS: Flash power-down in Stop mode.
When set, the Flash memory enters power-down mode when the device enters Stop mode.
This allows to achieve a lower consumption in stop mode but a longer restart time.
0: Flash memory not in power-down when the device is in Stop mode.
1: Flash memory in power-down when the device is in Stop mode.

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