Shown here is a graphical representation of the seamless movement in and out of the low power modes and the active mode. In Low Power Mode 0 (LPM0), only the CPU is off while both the DCO and A Clocks are on along with any peripherals that use these clocks. In Standby mode, also called Low Power Mode 3, the DCO and SM Clocks are off and only the A Clock is left on along with any peripherals that use this clock such as the real-time clock timer, LCD driver, and maintaining the contents of the RAM and peripheral registers. Other names for this mode are real-time clock mode, LPM3, and standby mode. Finally, all of the clocks are off in Low Power Mode 4 (LPM4). Moving in and out of active mode to any of the low power modes is accomplished through interrupts. To enter the low power modes, control bits must be set while exiting the low power modes is accomplished with interrupts. To minimize the current consumption of an application, the ideal would be to spend as much time as possible in Low Power Mode 3 with only the A Clock active.