Current consumption increases as Vcc increases, so being able to operate at a true 1.8V level is important. Not all MCUs operate fully at 1.8V as the use of the analog and memory modules can force the user to use a higher voltage. All AVR microcontrollers operate from 1.8V to 5.5V. All features are fully operational over the entire range, including analog modules, Flash, EEPROM, and RAM. True 1.8V operation also ensures longer battery life, lower current at lower voltage, and allows a deeper discharge of batteries.