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:
May. 26, 1992
Filed:
Nov. 01, 1988
Kouki Noguchi, Kokubunji, JP;
Fumio Tsuchiya, Kodaira, JP;
Takashi Tsukamoto, Kodaira, JP;
Shigeki Masumura, Kodaira, JP;
Hideo Nakamura, Tokyo, JP;
Shiro Baba, Tokorozawa, JP;
Yoshimune Hagiwara, Hachioji, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Microcomputer Engineering Ltd., Tokyo, JP;
VLSI Engineering Corporation, Tokyo, JP;
Abstract
In a microprocessor, a minimum instruction code length is set to a predetermined number of bits (e.g. one byte) length. One feature of the invention is that an instruction set which can selectively expand the instruction code length at a unit of the predetermined number of bits is used. Another feature is that an operand addressing mode and a type of operation for an operand are designated by separate predetermined number of code bits which are coded in a common coding scheme so that an instruction decoder is shared by those codes.