DS51795A Datasheet, PDF (83/98 Pages) Microchip Technology – PICkit™ 3 Programmer/Debugger

Glossary
Librarian
See Archiver.
Library
See Archive.
Linker
A language tool that combines object files and libraries to create executable code,
resolving references from one module to another.
Linker Script Files
Linker script files are the command files of a linker. They define linker options and
describe available memory on the target platform.
Listing Directives
Listing directives are those directives that control the assembler listing file format. They
allow the specification of titles, pagination and other listing control.
Listing File
A listing file is an ASCII text file that shows the machine code generated for each C
source statement, assembly instruction, assembler directive, or macro encountered in
a source file.
Little Endian
A data ordering scheme for multibyte data whereby the least significant byte is stored
at the lower addresses.
Local Label
A local label is one that is defined inside a macro with the LOCAL directive. These
labels are particular to a given instance of a macro’s instantiation. In other words, the
symbols and labels that are declared as local are no longer accessible after the ENDM
macro is encountered.
Logic Probes
Up to 14 logic probes can be connected to some Microchip debuggers. The logic
probes provide external trace inputs, trigger output signal, +5V, and a common ground.
Loop-Back Test Board
Used to test the functionality of the MPLAB ICD 3 in-circuit debugger.
LVDS
Low Voltage Differential Signaling. A low noise, low-power, low amplitude method for
high-speed (gigabits per second) data transmission over copper wire.
LVDS differs from normal input/output (I/O) in a few ways:
Normal digital I/O works with 5 volts as a high (binary ‘1’) and 0 volts as a low (binary
‘0’). When you use a differential, you add a third option (-5 volts), which provides an
extra level with which to encode, and results in a higher maximum data transfer rate.
A higher data transfer rate means fewer wires are required, as in UW (Ultra Wide) and
UW-2/3 SCSI hard disks, which use only 68 wires. These devices require a high trans-
fer rate over short distances. Using standard I/O transfer, SCSI hard drives would
require a lot more than 68 wires.
Low voltage means that the standard 5 volts is replaced by either 3.3 volts or 1.5 volts.
LVDS uses a dual wire system, running 180 degrees of each other. This enables noise
to travel at the same level, which in turn can get filtered more easily and effectively.
© 2009 Microchip Technology Inc.
DS51795A-page 79