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. 17, 1978
Filed:
May. 24, 1976
Earl F Carlow, Scottsdale, AZ (US);
Michael F Wiles, Phoenix, AZ (US);
Motorola, Inc., Chicago, IL (US);
Abstract
A peripheral interface adaptor (PIA) circuit for data processing systems contains memory elements or control registers allowing modification under program control of the logical functions of the PIA. A peripheral interface adaptor includes a plurality of data bus buffer circuits coupled to a bidirectional data bus and further includes peripheral interface buffer circuits coupled to a bidirectional peripheral data bus. A direction of data flow at the peripheral interface data bus is controlled by a data direction register. Data from the data bus buffer is entered into an input register, and is transferred from there to an input bus coupled to the control register, the data direction register and a data register. Data from the peripheral data bus the data direction register and the control register are transferred via the output bus to the data bus buffers. Control circuits include an interrupt/status logic circuit for transmitting control signals to and receiving interrupt signals from a peripheral unit coupled to the interface circuit.