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:
Aug. 02, 1977
Filed:
Sep. 18, 1975
Thomas H Bennett, Scottsdale, AZ (US);
Earl F Carlow, Scottsdale, AZ (US);
Anthony E Kouvoussis, Phoenix, AZ (US);
Rodney H Orgill, Norristown, PA (US);
Charles Peddle, Norristown, PA (US);
Michael F Wiles, Phoenix, AZ (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A microprocessor includes a data bus and an address bus. The address bus has first and second sections coupled together in series by bus switch circuitry. The microprocessor also includes control circuitry for controlling various data transfers in the microprocessor. The bus switch circuitry includes a plurality of MOSFETs each having their gate electrodes coupled to the control circuitry and having their sources and drains coupled to corresponding bus conductors of the first and second sections of the address bus. A program counter, incrementer and other working registers are coupled between the address bus first section and the data bus. An accumulator register and an arithmetic logic unit are coupled between the second section of address bus and the data bus. An index register for storing information to be utilized in an indexed addressing mode of operation is coupled to both the first and second sections of the address bus and to the data bus.