Zilog Z80380 Manual de usuario Pagina 112

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Glossary
Glossary-10 UM004001-COR1103
USART Universal Synchronous/Asynchronous
Receiver/Transmitter. Can handle synchronous as well
as asynchronous transmissions.
USB Universal Serial Bus.
USC Universal Serial Controller.
UTB Use Test Box. A board or system to test a particular
chip in an end-use application.
V Volt, Overflow Flag.
WDT Watch-Dog Timer. A timer that, when enabled under
normal operating conditions, must be reset within the
time period set within the application (WDTMR (1,0)). If
the timer is not reset, a Power-on Reset occurs. Some
earlier manuals refer to this timer as the WDTMR.
WDTOUT Watch-Dog Timer Output.
Word Amount of data a processor can hold in its registers
and process at one time. A DSP word is often 16 bits.
Given the same clock rate, a 16-bit controller
processes four bytes in the same time it takes an 8-bit
controller to process two.
WR Write.
WS Wafer Sort.
X Indexed Address, Undefined.
XOR Bitwise Exclusive OR.
XTAL Crystal.
Z Zero, Zero Flag.
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