In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Macgman2000 wrote:

I usually use a bootstrap method. If the system needs to wake up on a button press I use a zener and current pass transistor for the regulator. The switches are momentary double throw, one set of contacts bias the zener regulator to supply the mcu with power. Once it boots up it uses an I/O line to hold the regulator on, long enough to blast out data packets via radio. Then the mcu unlatches and goes back to sleep. No sleep current.

Nick

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