Generate a reset signal from a falling edge trigger
A monostable multivibrator circuit can provide the pulse (not toggle) that the question seems to describe, and can be triggered as per requirement. 

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Monostables can be made in many ways, such as using bipolar junction transistors as per the schematic above, or using the venerable 555 timer as shown below.

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If you must use a 555, consider the ultra low power CSS555C timer, which has a supply current of 5 to 10 µA. Even this may be well over the power budget for the application.

Specifically, note the "C" at the end of the part number: This indicates an internal capacitor integrated on the chip, thus reducing current consumption further.