Microchip megaAVR devices in general, and the Microchip picoPower megaAVR devices in particular, are designed to be energy efficient. Along with an efficient CPU and low-power peripherals, proprietary Microchip production processes provide extremely low leakage currents in sleep modes. For instance, in power-down mode with full RAM and register retention, a typical picoPower megaAVR device will consume only 100nA. This is less than the self-discharge current of many batteries. In power save mode with full retention, the real-time counter and an external 32KHz crystal running, the same device will consume only 650nA.