公开(公告)号：JPH09269854A

公开(公告)日：1997-10-14

申请号：JP14748296

申请日：1996-06-10

Applicant: UNITED MICROELECTRONICS CORP

Inventor： ROGAA CHIEN ,  NEIRU TAI ,  TOMII CHIEN ,  UESURII JIEN

IPC: G06F1/32 ,  G06F1/26

Abstract: PROBLEM TO BE SOLVED: To reduce power and to adjust a device to a standard by setting a system to a power cut mode and setting it to return to a regular operation mode in response to an external trigger signal under an appropriate situation. SOLUTION: When a central processing unit 10 executes a meaningless DO loop, the system starts a special service program for saving necessary data, a notice for power-cutting the central processing unit 10 is given to a power controller 20 and the central processing unit 10 becomes a power cut state for reducing power consumption. When a new event is started, a trigger controller 30 decides it or receives the external trigger signal. A starting resetting signal 16 is transmitted to the power controller 20 is response to the trigger signal, the power controller 20 is triggered by the signal and the power of the central processing unit 10 is restored. The power of the central processing unit 10 is supplied, necessary data is restored and the internal program is executed in response to the new event.