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Battery backup pin



Hello,
Where can we download the full specification of the Etrax 100LX MCM ?
Is there a pin for battery backup the internal memory ?
(We would like to save the current Etrax status if the power go down ...)
What is the function of the pin WAIT ?
What is the different between the Etrax 100LX MCM 4+16 E1 and E2 ?
-- 
Philippe Frossard