ELECTRONIC APPARATUS WITH IMPROVED MEMORY POWER MANAGEMENT

• US 20090013198A1
• Filed: 09/10/2008
• Published: 01/08/2009
• Est. Priority Date: 11/09/2004
• Status: Abandoned Application

• Current Assignee: Fujitsu Mobile Communications Limited (Fujitsu Limited)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: TANAKA, Tsutomu, Aoto, Kunihiko, Maruyama, Kiyoko
• Application Number:
  US12/208,165
• Publication Number:
  US 20090013198A1
• Time in Patent Office: Days
• US Class Current: 713/300
• CPC Class Codes: G11C 5/14 Power supply arrangements , e.g. power down, chip selection or deselection, layout of wirings or power grids, or multiple supply levels

Abstract

An electronic apparatus includes a battery holder, a detector detecting a battery, a non-volatile memory storing a program for initialization, a volatile memory, a first power supply for the non-volatile memory, a second power supply for the volatile memory, a power switch, a power supply controller activating the first power supply and the second power supply after the battery is detected or after the power switch is turned on, and a management circuit sending the program from the non-volatile memory to the volatile memory if the first and the second power supplies are activated and before the program is fully sent to the volatile memory, causing the power supply controller to deactivate the first power supply after sending the program, and causing the program in the volatile memory to run after the power switch is turned on.

Claims

1. An electronic apparatus comprising:

a battery holder;

a detector for detecting a battery placed in the battery holder by measuring a voltage of an output of the battery;

a non-volatile memory for storing a program for initialization;

a volatile memory;

a first power supply for supplying the non-volatile memory with power from the battery placed in the battery holder;

a second power supply for supplying the volatile memory with power from the battery placed in the battery holder;

a power switch for causing the first power supply and the second power supply to be activated;

a power supply controller for activating the first power supply and the second power supply after the detector detects the battery if the measured voltage of the output of the battery is no lower than a predetermined value, and for activating the first power supply and the second power supply after the power switch is turned on; and

a management circuit for sending the program from the non-volatile memory to the volatile memory after the first power supply and the second power supply are activated and before the program is fully sent to the volatile memory, for causing the power supply controller to deactivate the first power supply after sending the program and before the power switch is turned on, and for causing the program in the volatile memory to run after the power switch is turned on.

2. The electronic apparatus of claim 1, wherein the power switch is one of a manual switch and an automatic switch with a timer.

3. The electronic apparatus of claim 1, wherein the power supply controller deactivates the second power supply if the measured voltage of the output of the battery falls below a threshold before the power switch is turned on.

4. The electronic apparatus of claim 1, further comprising a first housing and a second housing which are connected to each other and configured to open and close with respect to each other, wherein the power switch is configured to be turned on when the first housing and the second housing open with respect to each other.

5. The electronic apparatus of claim 1, further comprising a first housing and a second housing which are connected to each other and configured to open and close with respect to each other;

and

an additional switch configured to be turned on when the first housing and the second housing open to each other,

wherein the power supply controller activates the first power supply and the second power supply when the additional switch is turned on.

6. An electronic apparatus comprising:

a battery holder;

a detector for detecting a battery placed in the battery holder by measuring a voltage of an output of the battery;

a non-volatile memory for storing a program for initialization;

a volatile memory;

a first power supply for supplying the non-volatile memory with power from the battery placed in the battery holder;

a second power supply for supplying the volatile memory with power from the battery placed in the battery holder;

a power switch;

a power supply controller for activating the first power supply and the second power supply at least one of after the detector detects the battery if the measured voltage of the output of the battery is no lower than a predetermined value, and the power switch is turned on; and

a management circuit for sending the program from the non-volatile memory to the volatile memory if the detector detects the battery, for causing the power supply controller to deactivate the first power supply upon completion of sending the program, and for causing the program in the volatile memory to run if the power switch is turned on.

7. The electronic apparatus of claim 6, wherein the power switch is one of a manual switch and an automatic switch with a timer.

8. The electronic apparatus of claim 6, wherein the power supply controller activates the first power supply and the second power supply when the detector detects the battery, and the power supply controller activates the first power supply and the second power supply when the power switch is turned on.

9. The electronic apparatus of claim 6, wherein the power supply controller activates the first power supply and the second power supply when the detector detects the battery, and the power supply controller activates the first power supply and controls the second power supply to remain active when the power switch is turned on.

10. An electronic apparatus comprising:

a battery holder;

a detector for detecting a battery placed in the battery holder by measuring a voltage of an output of the battery;

a non-volatile memory for storing a program for initialization;

a volatile memory;

a first power supply for supplying the non-volatile memory with power from the battery placed in the battery holder;

a second power supply for supplying the volatile memory with power from the battery placed in the battery holder;

a power switch;

a power supply controller for activating the first power supply and the second power supply at least one of after the detector detects the battery if the measured voltage of the output of the battery is no lower than a predetermined value, and the power switch is turned on, the power supply controller configured to deactivate the second power supply if the measured voltage of the output of the battery falls below a threshold before the power switch is turned on; and

a management circuit for sending the program from the non-volatile memory to the volatile memory if the detector detects the battery, for causing the power supply controller to deactivate the first power supply upon completion of sending the program, and for causing the program in the volatile memory to run if the power switch is turned on.