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. 14, 1990
Filed:
Nov. 27, 1989
Dale E Gulick, Austin, TX (US);
Terry G Lawell, Austin, TX (US);
Charles Crowe, Germantown, TN (US);
Advanced Micro Devices, Inc., Sunnyvale, CA (US);
Abstract
A universal asynchronous receiver-transmitter (UART) (54) is dislosed which is compatible with an industry standard yet provides additional features. The UART can be selectably operated in a synchronous or an asynchronous mode. First-in, first-out (FIFO) registers (404,424) are provided for both the receiver and transmitter portions of the UART, and a parity error and special character recognizer unit (412) on the receive side flags characters when they are placed in the reveive FIFO. Reception of a special character or one with a parity error is reported to the user via an interrupt mechanism (430). A random access memory (RAM) (413) with the special character recognized stores user-supplied patterns which are recognized as special characters. User-accessible status and control registers (408) have bit positions which enable and control the enhanced functions of the UART while maintaining compatability with the industry standard.