公开(公告)号：US09891687B2

公开(公告)日：2018-02-13

申请号：US14716207

申请日：2015-05-19

Applicant: S-PRINTING SOLUTION CO., LTD.

Inventor： Ho-beom Park

IPC: G06F1/32 ,  G06F3/12 ,  G06F9/44

CPC classification number: G06F1/3203 ,  G06F1/3284 ,  G06F1/3287 ,  G06F3/1221 ,  G06F3/1229 ,  G06F9/4401 ,  Y02D10/159 ,  Y02D10/1592 ,  Y02D10/171 ,  Y02D50/20

Abstract: An image forming apparatus is connected to a host device including first and second power domains which are separately supplied with power and includes first and second memories to be disposed in the second power domain, a main controller disposed in the first power domain and to perform a control operation using the first memory in a normal mode, and a sub-controller disposed in the second power domain and perform a control operation using the second memory in a power-saving mode, where when the normal mode is changed to the power-saving mode a power supply to the first power domain is shut off, the first memory operates in a self-refresh mode, and the main controller copies central processing unit (CPU) context information into a context storage unit, and when the power-saving mode is changed to the normal mode, the main controller is booted using the CPU context information stored in the context storage unit.