Motorola CP040 Basic Service Manual page 64

2
OMPAC
PC Board
PL
PLL
PTT
RAM
Registers
RESET
RF PA
RIB
ROM
RSSI
RPT/TA
Softpot
Software
SPI (clock and data
lines)
Squelch
Standby Mode
TOT
TPL
µC
UHF
Over-Molded Pad-Array Carrier: a Motorola custom package, distinguished by
the presence of solder balls on the bottom pads.
Printed Circuit Board
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 ref-
erence, usually after passing through a frequency divider.
Push-To-Talk: the switch located on the left side of the radio; when pressed,
causes the radio to transmit.
Random Access Memory: the radio's RAM is loaded with a copy of the EE-
PROM data.
Short-term data-storage circuits within the microcontroller.
Reset line: an input to the microcontroller that restarts execution.
Radio Frequency Power Amplifier
Radio Interface Box
Read Only Memory
Received Signal-Strength Indicator: a dc voltage proportional to the received
RF signal strength.
Repeater/Talk-Around
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.
Muting of audio circuits when received signal levels fall below a pre-deter-
mined value.
An operating mode whereby the radio is muted but still continues to receive
data
Time-Out Timer: a timer that limits the length of a transmission.
Tone Private-line
Microcontroller
Ultra High Frequency
Glossary