UP-X200 (serv.man9). Service Manual - Sharp EPOS Service Manual (repair manual). Page 8

UP-X200

Power Management

– 6 –

1

Factory setting
Status with no power supply. 

The CPU begins to run when the battery is inserted.

2

OFF Status (Boot Loader)

Initialization is carried out from the HW reset status and the
suspend status effected by the boot loader.

•  Reduction of OFF current may be achieved by suspending the

power supply and clock of unnecessary devices, and setting up a

CPU port.

3

RUN Status

Switch ON using the [Power] key.

•  A fatal check must be executed and if a fatal status is detected,

power must not be switched on.
Power must not be switched on if GPIO 17 (MAIN_BATT_LB) is

active (3 read calls at 10ms intervals), or if the battery compart-

ment lid is in unlock status.

•  In the RUN status, current consumption must be minimized by

switching off the power and clock requirements.

Additionally, it is recommended that application designs should

incorporate INFINTE as the TIME OUT for each thread (i.e. iop-
eration based on interrupt drive), enabling an environment where

the CPU can carry out IDLE processing.

•  When stored on the Flash disk, the registry information, favorites

and attached files are read out.

4

OFF Status (OS)

Transition to the suspend status may be accompished in one of the

two ways detailed below.

Note when a suspension is intialized under the conditions stated

below, Normally, resumption may be effected by input of the

[Power] key (exceptions: 

6

, 

8

).

[Transition to the suspend status by pressing the [Power] key, or

upon request from the application]

•  Reduce OFF current by suspending the power supply and clock

of an unnecessary device, and setting up a CPU port.

•  Suspension is effected in the following sequence.

1. A buzzer sounds.

2. Register information, favorites and attached files are stored.

3. GwesPowerOffSystem is called.

The buzzer tone lets the user know that files are being saved and

that caution is required. At the same time, the buzzer also acts as a

warning to the user not to remove the batteries.

*

Note, the [Power] key suspend function is valid only when the [Power]

key is enabled in the register shown below.

Registry: SYSTEM

CurrentControlSet

Control

Power

Key: DisablePowerOff

0: [Power] key enabled.

1: [Power] key disabled.

OFF 

RUN 

IDLE 

Ex-factory 
shipping status

 

Battery 
inserted 

Power key

Full reset

 

SW RESET 

OFF

Switches to OFF after storing registry data, etc., on the flash disk while 
sounding the buzzer when in enabled status.

Full reset, backup 
battery discharge

 

 

 

 

 

 

Full reset

 

 

Boot Loader

Reset button: Only valid when enabled
Reset port: Unconditionally valid

4

5

3

6

5

2

1

8

6

7

HW RESET

[Low battery, battery compartment lid]

Switches to OFF while sounding the buzzer.
*Note, however, that when switching to RUN, resume processing is carried 
out via the ON routine in the boot loader.

 [Power button, application requirements]

YY

YY

YY

YY