Motorola ASTRO XTS 3500 Basic Service Manual page 10

MISO
MOSI
OMPAC
Open
Architecture
PC Board
PCIC
PL
PLL
PTT
Registers
Repeater
RESET
RF PA
RSS
RPT/TA
RX DATA
Signal Qualifier Mode
SCI IN
Softpot
Software
SPI
viii
Master In Slave Out; used by the slave device to send data to the
master device.
Master Out Slave In; used by the master device to send data to the
slave device.
Over-Molded Pad-Array Carrier; a Motorola custom IC package,
distinguished by the presence of solder balls on the bottom pads.
A controller configuration that utilizes a microprocessor with
extended ROM and RAM.
Printed Circuit board
Power Control IC
Private-Line ® tone squelch; a continuous sub-audible tone that is
transmitted along with the carrier.
Phase-Locked Loop; a circuit in which an oscillator is kept in phase
with a reference, usually after passing through a frequency divider.
Push-To-Talk; the switch located on the left side of the radio
which, when pressed, causes the radio to transmit.
Short-term data-storage circuits within the microcontrol unit or
programmable logic IC.
Remote transmit/receive facility that re-transmits received signals
in order to improve communications coverage.
Reset line; an input to the microcontroller that restarts execution.
Radio Frequency Power Amplifier
Radio Service Software
RePeaTer/Talk-Around
Recovered digital data line.
An operating mode whereby the radio is muted but still continues
to analyze receive data to determine RX signal type.
Serial Communication Interface INput line
Software potentiometer; a computer-adjustable electronic
attenuator.
Computer programs, procedures, rules, documentation, and data
pertaining to the operation of a system.
Serial Peripheral Interface; how the microcontroller communicates
to modules and ICs through the CLOCK and DATA lines.