System for operating a universal asynchronous receiver/transmitt

Details System for operating a universal asynchronous receiver/transmitt System for operating a universal asynchronous receiver/transmitt

1998-05-29

2000-04-25

Lee, Thomas C.

Electrical computers and digital data processing systems: input/

Input/output data processing

Flow controlling

710105, 710100, 375377, 375354, G06F 1314

Patent

active

060555858

ABSTRACT:
A method and apparatus for increasing the speed of a Universal Asynchronous Receiver/Transmitter ("UART") while maintaining backward compatibility. The UART contains registers for controlling the flow of data. Two registers are the DLL (Divisor Latch Least significant) internal register and the DLM (Divisor Latch Most significant) internal register. Due to the UART not using all of the 16 bits contained in the DLL and DLM registers, an additional register, the Increased Baudrate (IB) register, is created. The IB register uses bits which are unused (or always set to zero in a conventional UART). Through the IB register, the UART may use higher crystal frequencies. In addition, when the UART is at speeds equal to or less than 115,200 bits per second, the IB register is programmed to zero, thus mimicking the operation of a convention UART at speeds equal to or less than 115,200 bits per second. Thus, the method and system for a high speed UART increases speeds while still maintaining backward compatibility.

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Exar, ST16C650A, UART With 32-Byte Fifo's And Infrared (IrDA) Encoder/Decoder. pp. 1-31.

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