A central processing unit (CPU) can specify an initial (e.g., baseline)
frequency for a clock signal used by a device to perform a task. The CPU
is then placed in a reduced power mode. The device performs the task
after the CPU is placed in the reduced power mode until a triggering
event causes the device to send an interrupt to the CPU. In response to
the interrupt, the CPU awakens to dynamically adjust the clock frequency.
If the clock frequency is reset to the baseline value, then the CPU is
again placed in the reduced power mode.