Datasheet

 2009-2012 Microchip Technology Inc. DS70616G-page 437
dsPIC33EPXXX(GP/MC/MU)806/810/814 and PIC24EPXXX(GP/GU)810/814
25.0 COMPARATOR MODULE
The comparator module provides three comparators
that can be configured in different ways. As shown in
Figure 25-1, individual comparator options are
specified by the comparator module’s Special Function
Register (SFR) control bits.
These options allow users to:
• Select the edge for trigger and interrupt generation
• Configure the comparator voltage reference and
band gap
• Configure output blanking and masking
The comparator operating mode is determined by the
input selections (i.e., whether the input voltage is
compared to a second input voltage or to an internal
voltage reference).
FIGURE 25-1: COMPARATOR I/O OPERATING MODES
Note 1: This data sheet summarizes the features
of the dsPIC33EPXXX(GP/MC/MU)806/
810/814 and PIC24EPXXX(GP/GU)810/
814 families of devices. It is not intended
to be a comprehensive reference source.
To complement the information in this data
sheet, refer to Section 26. “Op Amp/
Comparator” (DS70357) of the
“dsPIC33E/PIC24E Family Reference
Manual”, which is available from the
Microchip web site (www.microchip.com).
2: Some registers and associated bits
described in this section may not be
available on all devices. Refer to
Section 4.0 “Memory Organization” in
this data sheet for device-specific register
and bit information.
IVREF
Comparator Voltage
CMPx
(1)
Blanking
Function
Digital
Filter
Output Data/Control
CxOUT
(1)
Reference
CxIN2-
(1)
CxIN1-
(1)
CxIN3-
(1)
(see Figure 25-2)
CVREF
(see Figure 25-3)
(see Figure 25-4)
+
–
V
IN+
V
IN-
BGSEL<1:0>
V REF +V REF -AV DD AV SS
2.20V
0.20V
0.60V
Note 1: An ‘x’ is a pin, bit or register name and denotes Comparator 1, 2 or 3.
00
01
10
11
00
01
10
11
VREF+
0
1
CREF
CxIN1+
(1)
CVREFIN
CCH<1:0>