PIC12F675 datasheet(39/136 Pages) MICROCHIP

39 / 136 page

 2010 Microchip Technology Inc.

DS41190G-page 39

PIC12F629/675

6.2

Comparator Configuration

There are eight modes of operation for the comparator.

The CMCON register, shown in Register 6-1, is used to

select the mode. Figure 6-2 shows the eight possible

modes. The TRISIO register controls the data direction

of the comparator pins for each mode. If the

Comparator mode is changed, the comparator output

level may not be valid for a specified period of time.

Refer to the specifications in Section 12.0 “Electri-

cal Specifications”.

FIGURE 6-2:

COMPARATOR I/O OPERATING MODES

Note:

Comparator interrupts should be disabled

during a Comparator mode change. Other-

wise, a false interrupt may occur.

Comparator Reset (POR Default Value - low power)

Comparator Off (Lowest power)

CM2:CM0 = 000

CM2:CM0 = 111

Comparator without Output

Comparator w/o Output and with Internal Reference

CM2:CM0 = 010

CM2:CM0 = 100

Comparator with Output and Internal Reference

Multiplexed Input with Internal Reference and Output

CM2:CM0 = 011

CM2:CM0 = 101

Comparator with Output

Multiplexed Input with Internal Reference

CM2:CM0 = 001

CM2:CM0 = 110

A = Analog Input, ports always reads ‘0’

D = Digital Input

CIS = Comparator Input Switch (CMCON<3>)

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 =

GP1/CIN-

GP0/CIN+

COUT

GP2/COUT

GP1/CIN-

GP0/CIN+

COUT

GP2/COUT

From CVREF Module

CIS =

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