Timeouts - Husky MP2500 Manual

32.3.2 Timeouts

MP2500 implements timeouts to conserve power when devices have been
idle for a period. These are:
•
The keyboard idle timeout. This turns MP2500 off if the keyboard is not
touched for the timeout period and communications is not active
(ensure the buffers are empty). To change or disable this timeout, use
INT 15H function 63H.
•
The backlight option's idle timeout. This turns the backlight off if the
keyboard is not touched for the timeout period. To change or disable
the timeout, use INT 10H function 65H.
In order for the BIOS time-outs to be used it is necessary for the unit to
have been in STOP mode for the period configured for the individual time-
outs.
Any application which needs to use the automatic BIOS power save
features (time-outs and power save modes) should enable STOP mode
during its initialisation by using INT 15H function AH=76h (Chapter 26).
This needs to be done since the programmer does not know if STOP mode
will be enabled or not when the software is first run. The application default
should be to use BX=1, enable unconditional power save. If any inhibitions
are required they should be used where, and only where, they are required.
The application should also set up both the idle time-out (automatic power
off) and the backlight (option) time-out during initialisation by using INT 15H
function AX=6301h, BX=0 (disable) to E10h seconds (Chapter 26) and INT
10H function AX=6501h, BX=0 (disable) to 12Ch seconds (Chapter 21)
respectively.
308 H MP2500 System Developer's Guide
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