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:
Feb. 14, 1984
Filed:
Sep. 29, 1980
Pern Shaw, Austin, TX (US);
Donald L Tietjen, Austin, TX (US);
Michael F Wiles, Round Rock, TX (US);
Other;
Abstract
A mode selection circuit is disclosed which is suitable for configuring a data processor at the time at which the data processor is initialized with a reset signal. Mode selection latches are coupled to terminals normally used as an input/output port for the data processor and the latches are clocked with a signal generated by a level detector circuit which senses the reset signal. The mode selection latches are programmed by applying appropriate logic levels to the terminals of the input/output port at the time at which the data processor is being reset. The circuitry is adapted for allowing the connection of a diode from a terminal of the input/output port to the reset terminal of the data processor in order to program a low logic level into the corresponding mode detection latch.