PIC12F683-E/MD MICROCHIP [Microchip Technology], PIC12F683-E/MD Datasheet - Page 55

• Manufacturer Part Number: PIC12F683-E/MD
• Description: 8-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology
• Manufacturer: MICROCHIP [Microchip Technology]

8.3
There are eight modes of operation for the comparator.
The CM<2:0> bits of the CMCON0 register are used to
select these modes as shown in Figure 8-4.
• Analog function (A): digital input buffer is disabled
• Digital function (D): comparator digital output,
• Normal port function (I/O): independent of com-
FIGURE 8-4:
© 2007 Microchip Technology Inc.
Legend: A = Analog Input, ports always reads ‘0’
Note 1:
overrides port function
parator
Comparator Reset (POR Default Value – low power)
CM<2:0> = 000
Comparator with Output
CM<2:0> = 001
Comparator without Output
CM<2:0> = 010
Comparator with Output and Internal Reference
CM<2:0> = 011
COUT (pin) D
COUT (pin) I/O
COUT (pin)
COUT (pin) D
CIN-
CIN+
CIN-
CIN+
Comparator Configuration
I/O = Normal port I/O
Reads as ‘0’, unless CINV = 1.
CIN-
CIN+
CIN-
CIN+
A
A
A
A
A
I/O
A
A
I/O
COMPARATOR I/O OPERATING MODES
From CV
REF
Off
COUT
Module
(1)
COUT
COUT
Comparator w/o Output and with Internal Reference
CM<2:0> = 100
Multiplexed Input with Internal Reference and Output
CM<2:0> = 101
Multiplexed Input with Internal Reference
CM<2:0> = 110
Comparator Off (Lowest power)
CM<2:0> = 111
CIS = Comparator Input Switch (CMCON0<3>)
D = Comparator Digital Output
COUT (pin) I/O
The port pins denoted as “A” will read as a ‘0’
regardless of the state of the I/O pin or the I/O control
TRIS bit. Pins used as analog inputs should also have
the corresponding TRIS bit set to ‘1’ to disable the
digital output driver. Pins denoted as “D” should have
the corresponding TRIS bit set to ‘0’ to enable the
digital output driver.
COUT (pin) D
COUT (pin)
Note:
COUT (pin) I/O
CIN-
CIN+
CIN-
CIN+
CIN-
CIN+
CIN-
CIN+
I/O
I/O
A
A
A
A
I/O
Comparator interrupts should be disabled
during a Comparator mode change to
prevent unintended interrupts.
A
I/O
CIS = 0
CIS = 1
CIS = 0
CIS = 1
From CV
PIC12F683
From CV
From CV
REF
REF
Off
REF
Module
(1)
DS41211D-page 53
Module
Module
COUT
COUT
COUT