Intermec 6200 Reference Guide

R

The CPU Busy call causes the System Idle and System Suspend Activity timers

to be reset.  This call acts as though an I/O activity was monitored by the APM

BIOS, in that it resets all system activity timers and causes the system either to

enter READY or remain in the Ready state.
The Set Power State function call with a device of 0001h causes the system to

enter System Suspend.  System Suspend is also entered whenever the

SUSPEND activity timer reaches zero or the ON/OFF button is pressed.  The

System Suspend state is exited only by a wakeup event.
Possible wakeup events (sources) are plentiful and are defined by the 6200 and

6300 Computers as follows:

"

ON/OFF button press

"

MODEM ring indicator

"

PC Card MODEM ring indicator

"

POD 1 ring indicator

"

POD 2 ring indicator

"

Real Time Clock Alarm expiration

"

Application of external power (charge)

Wakeup events can be set or masked via OEM APM function calls Get Wakeup

Mask and Set Wakeup mask.

Devices may be powerĆmanaged either by the system APM BIOS, APM device

driver, or APMĆaware application via the Set Power State function.
Device drivers or applications that control device power should be aware that,

when the system enters System Suspend, all peripheral devices managed by the

driver or application loses power during System Suspend but is restored to the

previous power state upon System Resume.
Device drivers or applications that use the Enable/Disable Device Power

Management function can override this functionality during Suspend.  These

drivers or applications take sole responsibility for device power management

during Suspend.  This feature allows system devices, the operating system, or

application to tell the BIOS to stop power managing a particular device, after

which operatingĆsystemĆspecific drivers or applications for that device may

directly take over power management.
Devices may be requested to be placed into any one of the following states via

the Set Power State function.

Table 4Ć2 

State

Definition

READY

Device is in its fullĆpower state

STANDBY Device is capable of doing some work but is in a lowĆpower state
SUSPEND Device is not capable of doing work and is in its lowest power state
OFF

Device is not capable of doing work and is in its lowest power state