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New-bie question on Low power modes: Sleep/LP Slepp

Question asked by j.martin on Jan 16, 2016
Latest reply on Jan 16, 2016 by Clive One

I am a beginner and experimenting with low power modes. I'm looking for two answers:

1. Is Sleep mode is mandatory to be configured with HSI, or we can also configure it with HSE 8MHz? SPL example and datasheets use HSI 16MHz in all place for Sleep.

To save HSE switch-on (~1ms) time, I am trying a low power mode with HSE. My project needs to switch run/low power mode in every 10ms.

2. In other experiment with LP sleep, do we need to enable PWR_UltraLowPowerCmd() & FLASH_SLEEPPowerDownCmd() every time before going to sleep and disable these two at wake-up routine, or it'll be disabled automatically?

Thank you for your answer.