Datasheet

 2012 Microchip Technology Inc. Preliminary DS41637B-page 197
PIC16(L)F1784/6/7
20.8 Comparator Response Time
The comparator output is indeterminate for a period of
time after the change of an input source or the selection
of a new reference voltage. This period is referred to as
the response time. The response time of the comparator
differs from the settling time of the voltage reference.
Therefore, both of these times must be considered when
determining the total response time to a comparator
input change. See the Comparator and Voltage
Reference Specifications in
Section 30.0 “Electrical
Specifications”
for more details.
20.9 Zero Latency Filter
In high-speed operation, and under proper circuit
conditions, it is possible for the comparator output to
oscillate. This oscillation can have adverse effects on
the hardware and software relying on this signal.
Therefore, a digital filter has been added to the
comparator output to suppress the comparator output
oscillation. Once the comparator output changes, the
output is prevented from reversing the change for a
nominal time of 20 ns. This allows the comparator
output to stabilize without affecting other dependent
devices. Refer to Figure 20-3.
FIGURE 20-3: COMPARATOR ZERO LATENCY FILTER OPERATION
CxOUT From Comparator
CxOUT From ZLF
TZLF
Output waiting for TZLF to expire before an output change is allowed
T
ZLF has expired so output change of ZLF is immediate based on
comparator output change