公开(公告)号：JPH1039962A

公开(公告)日：1998-02-13

申请号：JP10595797

申请日：1997-04-23

Applicant: IBM

Inventor： MICHAEL WILLIAM CLARKE ,  HEANEY JAMES ALFRED ,  NORRIS DUANE EDWARD ,  PAUL HARRISON BENSON IV

IPC: G06F1/32 ,  G06F1/26 ,  G06F1/30

Abstract: PROBLEM TO BE SOLVED: To provide a sure and inexpensive system for holding data in the case that an AC power fault is generated by providing a power management circuit for selectively changing the state of a computer system between a normal operation state and a suspension state in response to power source interruption urgency control signals. SOLUTION: A power source is operated so as to generate control signals to the power management circuit when an external power source stops the power supply of a prescribed level while this computer system 10 is in the normal operation state. The normal operation state is a first power source state, and in the state, the power source supplies system power from the external power source to the system 10 and supplies auxiliary power from the external power source to the power management circuit. In the suspension state, codes to be executed on a CPU is reversibly interrupted so as to resume the execution of the codes on the CPU after the power source is changed to the first power source state. The power management circuit changes the system 10 to the suspension state in response to the activation of the control signals by the power source.