Title:
SYSTEM AND METHOD FOR POWER SOURCE CONTROL
Document Type and Number:
Japanese Patent JPH1124797
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To prevent data destruction by automatically starting shut-down processing without stopping the supply of a main power source through the OFF of a power source switch, and automatically stopping the supply of the power source after the completion of this processing is waited. SOLUTION: When a power source control driver is integrated, it immediately sets a switch invalid flip-flop(FF) 22 and at the same time, an interruption processing routine to be executed at the time of power source switch OFF is started. When the power source switch is turned off in this case, a switch OFF signal 27 is made active but since the switch invalid FF 22 is set, a power source control FF 24 keeps a negate state and a power source ON signal 6 keeps an active state as well. Namely, even when the power source switch is set to OFF, the main power source is kept ON. When shut-down processing is completed, the setting of the power source switch is validized by resetting the switch invalid FF 22, the power source control FF 24 is set through an OR gate circuit 23, and the main power source is turned off.
Inventors:
KURASHIGE TAKEHIKO
Application Number:
JP17442197A
Publication Date:
January 29, 1999
Filing Date:
June 30, 1997
Export Citation:
Assignee:
TOSHIBA CORP
International Classes:
G06F1/26; (IPC1-7): G06F1/26
Attorney, Agent or Firm:
Norio Ogo (1 outside)