12F683 datasheet(51/148 Pages) MICROCHIP

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 2004 Microchip Technology Inc.

Preliminary

DS41211B-page 49

PIC12F683

8.3

Comparator Configuration

There are eight modes of operation for the comparator.

The CMCON0 register is used to select these modes.

Figure 8-3 shows the eight possible modes.

If the Comparator mode is changed, the comparator

output level may not be valid for the specified mode

change delay shown in Section 15.0 “Electrical

Specifications”.

FIGURE 8-3:

COMPARATOR I/O OPERATING MODES

Note:

Comparator interrupts should be disabled

during

Comparator

mode

change.

Otherwise, a false interrupt may occur.

Comparator Reset (POR Default Value – Low Power)

Comparator Off (Lowest Power)

CM<2:0> = 000

CM<2:0> = 111

Comparator without Output

Comparator w/o Output and with Internal Reference

CM<2:0> = 010

CM<2:0> = 100

Comparator with Output and Internal Reference

Multiplexed Input with Internal Reference and Output

CM<2:0> = 011

CM<2:0> = 101

Comparator with Output

Multiplexed Input with Internal Reference

CM<2:0> = 001

CM<2:0> = 110

Legend: A = Analog Input, ports always read ‘0’

CIS = Comparator Input Switch (CMCON0<3>)

D = Digital Input

GP1/CIN-

GP0/CIN+

Off (Read as ‘0’)

GP2/COUT

GP1/CIN-

GP0/CIN+

Off (Read as ‘0’)

GP2/COUT

GP1/CIN-

GP0/CIN+

COUT

GP2/COUT

GP1/CIN-

GP0/CIN+

COUT

GP2/COUT

From CVREF Module

GP1/CIN-

GP0/CIN+

COUT

GP2/COUT

From CVREF Module

GP1/CIN-

GP0/CIN+

COUT

GP2/COUT

From CVREF Module

CIS = 0

CIS = 1

GP1/CIN-

GP0/CIN+

COUT

GP2/COUT

GP1/CIN-

GP0/CIN+

COUT

GP2/COUT

From CVREF Module

CIS = 0

CIS = 1

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