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:
Jul. 13, 2004
Filed:
Feb. 14, 2000
Naoki Mitsuishi, Kodaira, JP;
Renesas Technology Corp., Tokyo, JP;
Abstract
A microcomputer is provided with a data-transfer unit such as a DMA (direct memory access) controller for controlling a transfer of data through an external bus. Used in an access to an external device controlled by the data-transfer unit, a bus-interface means of the microcomputer includes a buffer-register means which can be specified as either a source location or a destination location of a data transfer. Thus, an internal-bus master such as a CPU employed in the microcomputer is capable of reading out information such as a packet command from the buffer-register means at a high speed through an internal bus without using the external bus and, hence, capable of carrying out an operation reflecting a transfer control condition specified by the packet command.