a method and a system for supplying power to a microcontroller with a single cell . one embodiment of the present invention discloses incorporation of a power supply pump circuit with the microcontroller and their dynamic interaction . the microcontroller sends its power requirements to the power supply pump circuit and in response , the power supply pump circuit controls the operating voltage with optimal efficiency . the dynamic update of power supply pump circuit results in an efficient use of the power supply pump circuit and thus results in a reduction of the number of dry cell batteries to only a single cell . incorporation of the microcontroller and power supply pump circuit onto a single chip reduces the pin number requirements as well as the space required on the printed circuit board .