The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 22, 1996
Filed:
Jun. 20, 1994
Kouji Moriya, Higashiyamato, JP;
Casio Computer Co., Ltd., Tokyo, JP;
Abstract
An electronic device uses a pseudo-SRAM having a self-refreshing function, as a memory, and a refresh timing signal having a predetermined period is supplied to the pseudo-SRAM in the operation state of the electronic device. When no key operation is performed with a keyboard for a predetermined period of time, the electronic device switches into an idle mode to stop supply of an operation clock to a CPU and to stop supply of the timing signal to the pseudo-SRAM. When the supply of the timing signal to the pseudo-SRAM is stopped, the pseudo-SRAM operates the self-refreshing function for holding data with low power consumption. When a key operation is detected in the idle mode, a refresh timing signal having a high frequency is supplied to the pseudo-SRAM for a predetermined period of time. Thereafter, the supply of a clock to the CPU is restarted, and the state of the electronic device is returned to a normal operation state.