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8XC196MC, MD, MH USER’S MANUAL
Glossary-8
PWM Pulse-width modulated (outputs). The 8XC196Mx
devices have several options for producing PWM
outputs: the generic pulse-width modulator modules,
the waveform generator, and the EPA with or without
the PTS. The 8XC196MD also has a frequency
generator that produces PWM outputs.
quantizing error An unavoidable A/D conversion error that results
simply from the conversion of a continuous voltage to
its integer digital representation. Quantizing error is
always ± 0.5 LSB and is the only error present in an
ideal A/D converter.
RALU Register arithmetic-logic unit. A part of the CPU that
consists of the ALU, the PSW, the master PC, the
microcode engine, a loop counter, and six registers.
repeatability error The difference between corresponding code
transitions from different actual characteristics taken
from the same converter on the same channel with the
same temperature, voltage, and frequency conditions.
The amount of repeatability error depends on the
comparator’s ability to resolve very similar voltages
and the extent to which random noise contributes to
the error.
reserved memory A memory location that is reserved for factory use or
for future expansion. Do not use a reserved memory
location except to initialize it with FFH.
resolution The number of input voltage levels that an A/D
converter can unambiguously distinguish between.
The number of useful bits of information that the
converter can return.
sample capacitor A small (2–3 pF) capacitor used in the A/D converter
circuitry to store the input voltage on the selected
input channel.
sample delay The time period between the time that A/D converter
receives the “start conversion” signal and the time
that the sample capacitor is connected to the selected
channel.
sample delay uncertainty The variation in the sample delay.