Abstract: An electronic circuit for supplying prompting and action signals to a microprocessor includes quiescent and operating mode circuits and switches. The quiescent circuit supplies a prompting signal to a microprocessor prompting interrupt input. The prompting signal respectively corresponds to a logical 0 or 1 when the prompting signal voltage is below or above a threshold. The operating circuit supplies an action signal to a microprocessor action input when the microprocessor is in the operating mode. Internal switches switch between operation of the quiescent and operating circuits in response to the microprocessor mode and prevent electric current flow in the operating circuit when the microprocessor is in the quiescent mode. An external switch controls the quiescent and operating circuits to generate respective prompting and action signals. The prompting interrupt input generates an interrupt for switching the microprocessor from the quiescent mode to the operating mode.