Motorola ASTRO XTL 5000 Basic Service Manual page 191

Term
random access
memory
read-only memory
real-time clock
receiver
registers
repeater
repeater/talkaround
RESET
RF
RF PA
ROM
RPT/TA
RS232
RTC
RX
RX DATA
SAP
Serial Audio Port
Serial Peripheral
Interface
signal
6871769L01-A
A type of computer memory that can be accessed randomly; that is, any
byte of memory can be accessed without touching the preceding bytes.
A type of computer memory on which data has been prerecorded. Once
data has been written onto a ROM chip, it cannot be removed and can
only be read.
A module that keeps track of elapsed time even when a computer is
turned off.
Electronic device that amplifies RF signals. A receiver separates the
audio signal from the RF carrier, amplifies it, and converts it back to the
original sound waves.
Short-term data-storage circuits within the microcontroller unit or
programmable logic IC.
Remote transmit/receive facility that re-transmits received signals in
order to improve communications range and coverage (conventional
operation).
A conventional radio feature that permits communication through a
receive/transmit facility, which re-transmits received signals in order to
improve communication range and coverage.
Reset line: an input to the microcontroller that restarts execution.
See radio frequency.
See radio frequency power amplifier.
See read-only memory.
See repeater/talkaround.
A common interface standard for data communications equipment.
See real-time clock.
Receive.
Recovered digital data line.
See Serial Audio Port.
SSI to and from the CODEC used to transfer transmit and receive audio
data.
A serial interface comprised of two data lines and a clock line. This
interface is typically used to communicate with other modules and ICs in
the radio.
An electrically transmitted electromagnetic wave.
Definition
Glossary-7
October 30, 2006