公开(公告)号：JP2000242357A

公开(公告)日：2000-09-08

申请号：JP3142699

申请日：1999-02-09

Applicant: IBM

Inventor： KAWAHARA KATSUYUKI ,  MIYAMURA TSUYOSHI ,  MARUICHI TOMOKI ,  SUGAWARA TAKASHI

IPC: G06F1/04 ,  G06F1/32

Abstract: PROBLEM TO BE SOLVED: To reduce the power consumption of the system by performing no unnecessary CPU throttling by the power management device which performs CPU throttling. SOLUTION: The power management device 10 comprises an event detection part 12 which detects an event in the system, an activity detection part 14 which decides whether the system is in an idle or active state by checking activities in the system, and a clock control part 14 which performs CPU clock control. The clock control part 16 stops the CPU throttling when the system is in the idle state and performs the throttling only when the system is in a busy state, so that no unnecessary CPU throttling is performed.