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:
Mar. 31, 1992
Filed:
Apr. 05, 1989
Applicant:
Inventor:
Tadashi Okamoto, Osaka, JP;
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ; G06F / ; G06F / ; G06F / ;
U.S. Cl.
CPC ...
395400 ; 395775 ; 364D / ; 364D / ; 3642443 ; 3642545 ; 3642653 ;
Abstract
A processor having a memory for use as a stack and a stackpointer provided within the processor, includes circuits for judging a underflow and a overflow of the memory by receiving address of the stackpointer and a signal showing a stack operating instruction from an instruction decoding part in the processor, so as to be capable of calling a subroutine at a high speed, and judging and preventing an overflow or underflow of the stack.