STM32L0x1 reference manual says "the memory interface clock is stopped and the RAM is in power-down when in Low-power sleep mode" (DocID025942 Rev 8 p 145). Several pages below it says "In Low-power sleep mode, the Flash memory can be switched off and the RAM memory
remains available" (p 149). All other materials (app notes, etc.) say that RAM is ON in low power sleep mode ("STM32L0xx ultra-low power features overview" DocID025944 Rev 1 p7, for example). What does "power-down" actually mean in this context? Is data retained in RAM in this mode?
