Motorola ASTRO SPECTRA Service Manual page 164

Glossary-4
Term
inbound signaling
word
integrated circuit
ISW
key-variable loader
kHz
kilohertz
KVL
LCD
LED
light emitting diode
liquid-crystal display
LO
low-speed
handshake
LSH
Master In Slave Out
Master Out Slave In
MCU
MDC
MDI
MHz
Megahertz
microcontroller unit
MISO
February 3, 2003
Data transmitted on the control channel from a subscriber unit to the
central control unit.
An assembly of interconnected components on a small semiconductor
chip, usually made of silicon. One chip can contain millions of
microscopic components and perform many functions.
See inbound signaling word.
A device used to load encryption keys into a radio.
See kilohertz.
One thousand cycles per second. Used especially as a radio-frequency
unit.
See key-variable loader.
See liquid-crystal display.
See LED.
An electronic device that lights up when electricity is passed through it.
An LCD uses two sheets of polarizing material with a liquid-crystal
solution between them. An electric current passed through the liquid
causes the crystals to align so that light cannot pass through them.
Local oscillator.
150-baud digital data sent to the radio during trunked operation while
receiving audio.
See low-speed handshake.
SPI data line from a peripheral to the MCU.
SPI data line from the MCU to a peripheral.
See microcontroller unit.
Motorola Digital Communications.
MCU/DSP Interface internal to the Patriot IC.
See Megahertz.
One million cycles per second. Used especially as a radio-frequency
unit.
Also written as µC. A microprocessor that contains RAM and ROM
components, as well as communications and programming components
and peripherals.
See Master In Slave Out.
Definition
6881076C20-E