There were a lot of innovations for the C8051F9xx family developed specifically for low power. This chart shows some new low power features and the impact that they have on the three key operating modes. To reduce the overall power consumption, the application remains in the sleep mode as long as possible, wakes as fast as possible and goes back to the sleep mode when finished. For low duty cycle applications, the low power sleep mode is the main operating state. The current draw in this mode is the primary contributor to the average current. For higher duty cycle applications, the wake-up time, CPU/peripheral current consumption, and speed are the dominant factors in the average power equation. Consult the data sheet for the specific devices to see all of the new features added.