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Glossary-11
GLOSSARY
transfer function errors Errors inherent in an analog-to-digital conversion
process: quantizing error, zero-offset error, full-scale
error, differential nonlinearity, and nonlinearity.
Errors that are hardware-dependent, rather than being
inherent in the process itself, include feedthrough,
repeatability, channel-to-channel matching, off-
isolation, and V
CC
rejection errors.
UART Universal asynchronous receiver and transmitter. A
part of the serial I/O port.
V
CC
rejection The property of an A/D converter that causes it to
ignore (reject) changes in V
CC
so that the actual
characteristic is unaffected by those changes. The
effectiveness of V
CC
rejection is measured by the ratio
of the change in V
CC
to the change in the actual
characteristic.
wait state Time spent waiting for an operation to take place.
Wait states are added to external bus cycles to allow a
slow memory device to respond to a request from the
microcontroller.
watchdog timer An internal timer that resets the device if software
fails to respond before the timer overflows.
waveform generator One of the 8XC196Mx peripherals that can be used to
produce pulse-width modulated (PWM) outputs. The
waveform generator is optimized for controlling 3-
phase AC induction motors, brushless DC motors,
and other devices requiring multiple PWM outputs.
WDT See watchdog timer.
word Any 16-bit unit of data.
WORD An unsigned, 16-bit variable with values from 0
through 2
16
–1.
zero extension A method for converting data to a larger format by
filling the upper bit positions with zeros.
zero-offset error An ideal A/D converter’s first code transition occurs
when the input voltage is 0.5 LSB. Zero-offset error is
the difference between 0.5 LSB and the actual input
voltage that triggers an A/D converter’s first code
transition.