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:
Oct. 22, 1991
Filed:
May. 12, 1988
Roy E Hunninghaus, Des Plaines, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
Circuitry is provided which effectively expands one, and preferably two or more, high resolution timed outputs of a microprocessor device such that a larger number of output signals are selectively, and independent of one another, switched to output states at times determined in accordance with the occurrence of the timed outputs of the microprocessor. Essentially, high resolution event time occurrence information is provided by a microprocessor dedicated output port. Previously, information on a microprocessor data bus and address bus is utilized to selectively enable certain desired ones of a plurality of output latches and determine the next desired state of such enabled latches. All of the output latches effectively receive the high resolution timed output signal of the microprocessor. The result is an advantageous and cost effective high resolution expansion of the microprocessor outputs. Preferably the microprocessor has two dedicated timed output ports which effectively implement control of three or more independently operative output devices, such as fuel injectors of an automotive control system and/or spark/dwell or knock sense circuitry of such a system.