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The energy efficiency of today’s microcontrollers is supported by the extensive usage of low-power mechanisms. A full power-down requires in many cases a complex, and maybe error prone, administration scheme, because data from the volatile memory have to be stored in a flash based back- up memory. New types of non-volatile memory, e.g. in RRAM technology, are faster and consumes a fraction of the energy compared to flash technology. This paper evaluates power gating for WSN with RRAM as back-up memory.