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ABC of electronics terms

(To find chips for distinct functions, see the functional pages.)

U

UART

Universal Asynchronous Receiver Transmitter

local Choosing a UART

Serial port See also

RS-232 See also

UDMA

Ultra (something) Direct Memory Access?

www.doclib.org/Linux/kernel/udma-generic-0.2.1/udma-generic/UDMA.txt

UltraSCSI

See SCSI.

Ultrasonic means that the frequency is so high that people can't hear it. (Over 10 to 20 kHz). It was used a lot for remote controls in the seventies. Disadvantages: Dogs can still hear it. Shaking a bunch of keys could produce the same frequencies and change your TV's channel or even turn it off.

Currently infrared remote controls are used. A significant difference is that infrared beams must be directed towards the apparatus (or indirectly via a light colored wall whereas sound is much more multidirectional.

UMPS

Modeling language for CPU cores.

www.vmdesign.com/ - UMPS demo

What about creating an UMPS model in order your micro* will be included into UMPS libraries?
UMPS is specially designed to handle CPU core and simulate it as fast as possible, include also directly from the model Assembler/Disassembler.
Main difficulties are to write Help file and Asm library.

Tell me if you are interested in more.

Virtual Micro* Design
Philippe Techer

Unicode

The 'new ASCII' that tries to incorporate all known symbols from all languages. It uses 16 bits per character, but there are also ways to code it so that a normal ASCII file (using only 0..127) is also a valid Unicode file. See O'Reilly's book: 'Java in A Nutshell' ( ISBN: 1565924878 ) for $18, for example.

www.byte.com/ - Search for 'unicode' About globalizing programs with Unicode etc.

Unijunction transistor

www.americanmicrosemi.com/tutorials/unijunction.htm

Where	Manufacturer
www.tripplite.com/	Tripplite Corp

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