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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
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 modelin order your micro* will be included into UMPS libraries?UMPS is specially designed to handle CPU coreand 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

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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

Unit
An amount in the physical world is generally expressed in a unit, electrical resistance for example in Ohm. A lot of these units are standardized by the ISO (International Standards Organization).

www.bipm.org/enus/3_SI/base_units.html Bureau International des Poids et Mesures (in English)
www.megaconverter.com/ Site for converting units
www.legacysy.com/convert2/convert_old.html Other site

UPS
Uninterruptible Power Supply

Where Manufacturer
www.tripplite.com/ Tripplite Corp

USB
local This entry got it's own page.

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