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:
Sep. 03, 1991
Filed:
May. 15, 1989
Osamu Ueda, Hyogo, JP;
Kikuo Muramatsu, Hyogo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A multifunctional memory comprises a mask ROM (2). When an 'L' level signal is applied to a control pin (EXT), data is read out from the ROM (2) in response to an address signal inputted from a multiplex pin (AD/DA). Thereafter, the data read out from the ROM (2) is outputted from the multiplex pin (AD/DA). In this case, an 'H' level signal is outputted from a chip select pin (CS). When an 'H' level signal is applied to the control pin (EXT), an 'L' level signal is outputted from the chip select pin (CE). Consequently, the EPROM (30) is rendered active. In addition, the address signal inputted from the multiplex pin (AD/DA) is outputted from a port/address pin (PORT/AD). Data is read out from the EPROM (30) in response to the address signal.