PIC12F609-H/MD MICROCHIP [Microchip Technology], PIC12F609-H/MD Datasheet - Page 77

• Manufacturer Part Number: PIC12F609-H/MD
• Description: 8-Pin, Flash-Based 8-Bit CMOS Microcontrollers
• Manufacturer: MICROCHIP [Microchip Technology]

9.11
Each comparator has built-in hysteresis that is user
enabled by setting the CMHYS bit of the CMCON1
register. The hysteresis feature can help filter noise and
reduce multiple comparator output transitions when the
output is changing state.
FIGURE 9-7:
 2010 Microchip Technology Inc.
Note:
(Without Hysteresis)
(With Hysteresis)
Comparator Hysteresis
The black areas of the comparator output represents the uncertainty due to input offsets and response time.
Output
Output
V
V
V
V
H
IN
IN
H
+
-
-
+
COMPARATOR HYSTERESIS
V+
V
V
IN
IN
PIC12F609/615/617/12HV609/615
+
-
+
–
Figure 9-7 shows the relationship between the analog
input levels and digital output of a comparator with and
without hysteresis. The output of the comparator
changes from a low state to a high state only when the
analog voltage at V
hysteresis threshold (V
comparator changes from a high state to a low state
only when the analog voltage at V
lower hysteresis threshold (V
Output
IN
+ rises above the upper
H
+). The output of the
H
-).
IN
DS41302D-page 77
+ falls below the