A 2D3D dual-mode image sensing circuitry is composed of a photodiode, an active sensing unit, and a pull-down unit. The fence post has a U-shaped center section positioned between two flanges, and each of the flanges includes a plurality of holes extending along an edge. A frequency spacing for each micro-controller within the operating frequency range of the electronic device is then calculated, and an operating frequency is assigned to each micro-controller.