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. 04, 2006
Filed:
Dec. 07, 2004
Eiichi Ishikawa, Princeton, NJ (US);
Yasuyuki Saito, Kodaira, JP;
Masanao Sato, Tokyo, JP;
Naoki Yada, Sayama, JP;
Kiyoshi Matsubara, Higashimurayama, JP;
Eiichi Ishikawa, Princeton, NJ (US);
Yasuyuki Saito, Kodaira, JP;
Masanao Sato, Tokyo, JP;
Naoki Yada, Sayama, JP;
Kiyoshi Matsubara, Higashimurayama, JP;
Renesas Technology Corp., Tokyo, unknown;
Abstract
A microcomputer incorporating a flash memory which is erased and programmed electrically in a stable manner within a relatively wide range of external power supply voltages including those for low-voltage operations. The microcomputer comprises a voltage clamp unit including a reference voltage generating circuit and a constant voltage generating circuit. In operation, the voltage clamp unit generates a voltage of a low dependency on a supply voltage and clamps the generated voltage to a voltage level which, within a tolerable range, is lower than a single supply voltage externally furnished. This prevents voltages boosted by boosting circuits operating on the clamped voltage, i.e., programming and erasure voltages, from being dependent on the externally supplied voltage.