In summary, many features found on the single cycle, pipelined C8051F9xx family of MCUs were designed for power efficiency. With 160µA/MHz active mode current at 24.5MHz operation, and 300nA, 50nA and 10nA sleep mode currents, the C8051F9xx is one of the lowest power MCUs on the market. The C8051F9xx family has several low power modes and fast wake up times for each. It can also operate all the way down to 0.9V supply voltage, which provides the capability to run on one battery.