Casio IT-2000W manual DOZE/RUN Transit Function, RUN Doze, Activity causing RUN/DOZE transition

DOZE/RUN Transit Function

On this terminal the system will reduce the clock speed of the built-in CPU if no activity (access to the touch panel, keys, COM1, or file) has occurred for a specified period of time (four seconds). The state in which the CPU clock speed has been reduced is called the "DOZE state" and the state in which the CPU is operating at full speed is called the "RUN state". If an activity occurs in the DOZE state, the system returns to the RUN state. The DOZE/RUN transit function automatically switches between the DOZE and RUN states.

No activity for

Touch panel

Key

a specified period

COM1

of time

File access

RUN	DOZE
Full speed	Low speed

Generation of

Touch panel

Key

Activity

COM1

File access

Fig. 2.8

Usually, application programs do not have to anxious about the RUN/DOZE state.

The user may tolerate the operation speed since the system shifts to the RUN state whenever the user attempts an action.

However, the clock speed is quickly reduced and CPU operation is slow if high-speed processing is attempted intentionally or if system operation continues without user action (e.g. in a long calculation). In order to avoid this, disable the power management function by means of the system library (refer to Chapter 8.6.2 “System Library”.).

Activity causing RUN/DOZE transition:

Touch panel input

Key input

￿Access to files Access to COM1

Note:

If the power management function is disabled by the system library, the Auto Power OFF function (APO) is also disabled. This is because both the power management function and Auto Power OFF function use the same activity processing routine.

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