公开(公告)号：JP2001184330A

公开(公告)日：2001-07-06

申请号：JP2000336638

申请日：2000-11-02

Applicant: MICROCHIP TECH INC

Inventor： HOFHINE PAUL ,  SMIT WILLEM ,  BINGHAM GREGORY C

IPC: G06F1/04 ,  G06F1/32 ,  G06F15/78

Abstract: PROBLEM TO BE SOLVED: To provide a system, a method and a device for maintaining a control and/or status state while keeping power in an integrated circuit(IC) microcontroller. SOLUTION: A microcontroller IC 100 is provided with a microcontroller core logic 102, an input/output port logic 106 suited to the storage of an output logic level, an interface logic 104 connected between the microcontroller core logic 102 and the input/output port logic 106, and a power switch 110 connected to the microcontroller core logic 102. When a power source 108 is connected to the microcontroller core logic 102, the microcontroller core logic 102 controls the output logic level of the input/output port logic 106 and when the power source 108 is disconnected from the microcontroller core logic 102, the output logic level of the input/output port logic 106 maintains the same state as just before the disconnection of the power source 108 from the microcontroller core logic 102.