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:
May. 11, 2004
Filed:
Oct. 22, 2002
Hiroo Nakano, Kanagawa-ken, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A semiconductor circuit having a power supply voltage detection circuit to detect a potential level of an external power supply voltage and to output a detection signal depending on a comparison result with the potential level. A system control circuit detects the detection signal, outputs a status signal and an interrupt signal, and outputs a clock selection signal in response to an operation control signal. A CPU outputs the operation control signal to the system control circuit in response to the status signal and the interrupt signal. A clock generation circuit generates a plurality of clock signals and a clock selection circuit selects one clock signal among the plurality of clock signals in response to the clock selection signal. The clock selection circuit then outputs the one clock signal as a system clock signal.