+For the atmega128 microcontroller, TOS_SLEEP_NONE is the "idle" power
+state.
+
+A second example use of McuPowerOverride is in the msp430 timer system.
+By default, the msp430 lowest power state is LPM4, which does not keep
+clocks enabled. If ``tinyos-2.x/tos/chips/msp430/timer/Msp430ClockC.nc''
+is included in the component graph, however, this configuration wires
+the McuPowerOverride of ``tinyos-2.x/tos/chips/msp430/timer/Msp430ClockP.nc``
+to McuSleepC. This implemementation of McuPowerOverride raises the lowest
+power state to LPM3, which keeps clocks enabled.
+
+For msp430 microcontrollers, TOS_SLEEP_NONE is the "active" power state.
+