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:
Jan. 05, 1999
Filed:
Jun. 06, 1997
Herman Chang, Hsinchu, TW;
Utek Semiconductor Corporation, Hsinchu, TW;
Abstract
A method and apparatus for improved scanning keyboard and diodes option is disclosed. Each of the pins is treated as one independent dimension so as to define a multi-dimensional configuration. The circuit includes a clock generation circuit, a keyboard I/O port device comprising a plurality of ports associated with the pins and a key detection register device. A key is arranged at the interconnection of any two ports. When the key is depressed, by maintaining the ports at a first level and applying a second level to each of the ports to check which port goes from the first level to the second level, the location of the key may be determined. The output of the ports are stored in the key detection register device for the determination of the key location.