Zilog ZUSBOPTS Manual de usuario Pagina 493

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UM017105-0511 Glossary
Zilog Developer Studio II – ZNEO™
User Manual
465
S
SCF. Set C Flag.
SL. Shift Left.
SLL. Shift Left Logical.
SP. Stack Pointer.
SR. Shift Right.
SRA. Shift Right Arithmetic.
Static. Characteristic of random-access memory that enables it to operate without clocking signals.
SUB. Subtract.
T
tristate. A form of transistor-to-transistor logic in which output stages, or input and output stages, can
assume three states. Two are normal low-impedance 1 and 0 states; the third is a high-impedance state that
allows many tristate devices to time-share bus lines. This industry term is not trademarked, and is available
for Zilog use. Do not use 3-state or three-state.
U
ULT. Unsigned Less Than.
W
wait state. A clock cycle during which no instructions are executed because the processor is waiting for
data from memory.
word. Amount of data a processor can hold in its registers and process at one time.
write. To make a permanent or transient recording of data in a storage device or on a data medium.
X
X. 1. Indexed Address. 2. An undefined or indeterminate variable.
XOR. Bitwise exclusive OR.
Z
Z. 1. Zero. 2. Zero Flag.
ZDS. Zilog Developer Studio. Zilog’s program development environment for Microsoft Windows.
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