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:
Apr. 29, 2008
Filed:
Feb. 03, 2005
Ryuichi Ogawa, Ichihara, JP;
Masaki Wakabayashi, Nara, JP;
Ryuichi Ogawa, Ichihara, JP;
Masaki Wakabayashi, Nara, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
An IC card according to the present invention comprises, a built-in coprocessor for an auxiliary arithmetic in addition to a main arithmetic processing unit, an interval timer for outputting an interrupt request signal upon lapse of a set time shorter than the frame waiting time, and coprocessor control means for controlling the coprocessor operation by suspending supply of an operation clock to the coprocessor in accordance with the output of the interrupt request signal and resuming supply of the operation clock to the coprocessor in accordance with a predetermined response input from an external device. Upon receipt of a command from the external device, the contents of the command are determined, and the time shorter than the frame waiting time is set in the interval timer thereby to start the interval timer.