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:
Jan. 06, 1981
Filed:
Mar. 08, 1979
Ralph W Haines, Santa Clara, CA (US);
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
The disclosed microprocessor time-shares an adder with a data memory, an accumulator, an I/O register, and an edge detector. This time-sharing is synchronized by a timing generator that produces interleaved first and second clocked pulses. Instructions are fetched from an instruction memory during the first clock pulses and are performed during the second clock pulses. To perform these instructions, the contents of the data memory and the accumulator are passed through the adder and fed back to the accumulator. In addition, during the first clock pulses, the contents of the I/O register and the output of the edge detector are passed through the adder and fed back to the I/O register. This allows the I/O register to be used as a counter while simultaneously allowing the structure of the I/O register to be greatly simplified.