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:
Nov. 08, 1988
Filed:
Nov. 25, 1985
Fumio Tsuchiya, Kodaira, JP;
Kiyoshi Matsubara, Kodaira, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A data processing LSI constructing a microcomputer has an EPROM for changing a program. The EPROM can be accessed directly through the external terminals of the data processing LSI. The EPROM is statically operated when it is written with data by direct access. However, the statically operated EPROM consumes relatively high power. This power consumption by the EPROM is reduced by dynamically operating its read circuit, address decoder and so on. For example, the read circuit is constructed of a sense amplifier and a latch circuit, and the sense amplifier has its operation interrupted after the latch circuit has latched the read data. The address decoder is composed of a load MOSFET and address MOSFETs. The load MOSFET is caused to act as a precharge element in the dynamic operation and as an opertion current feeding element in the static operation.