Power Modes - Husky MP2500 Manual

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Power modes

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Idle timeouts
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Switchable devices
32.3.1 Power modes
MP2500 can operate in a number of different modes, with different power
consumption and capabilities, as follows:
While turned on, MP2500 is usually in NORMAL mode, but switches to
STOP mode whenever it is waiting for keyboard input, to conserve power;
when a key is pressed, it switches back to NORMAL mode.
As STOP mode does not respond to interrupts other than RESET and NMI,
MP2500 can miss serial data while waiting for keyboard input, if a
communications package which relies on interrupts (such as H
communications) is selected.
To reduce this risk but still save power, MP2500 will use HALT mode
instead of STOP mode, once an application has started communications (ie
used INT 14H function 1 or 2).
If you think that there still might be problems, you can force MP2500 to use
HALT mode instead of STOP mode, by using INT 15H function 67H. This
will make sure that no interrupts are missed, but uses a little more power.
Normally, if an application is using BIOS services, MP2500 will remain in
NORMAL mode even if there is no user input. To allow use of low power
modes even while certain services are being used, use INT 15H function
8CH.
Chapter 32: Using Power Handling
USKY
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