PIC12F635ESLASHP datasheet(65/196 Pages) MICROCHIP

65 / 196 page

Preliminary

DS41232B-page 63

PIC12F635/PIC16F636/639

7.3

Comparator Configuration

There are eight modes of operation for the comparators.

The CMCON0 register is used to select these modes.

Figure 7-3 and Figure 7-4 show the eight possible

modes. The TRISA and TRISC registers control the data

direction of the comparator output pins for each mode. 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 7-3:

COMPARATOR I/O OPERATING MODES FOR PIC12F635

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)(1)

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

Note 1:

Lowest power statement assures valid digital stats on GPO, GP1 and GP2.

GP1/CIN-

GP0/CIN+

Off (Read as ‘0’)

GP2/C1OUT D

GP1/CIN-

GP0/CIN+

Off (Read as ‘0’)

GP2/C1OUT D

GP1/CIN-

GP0/CIN+

C1OUT

GP2/C1OUT D

GP1/CIN-

GP0/CIN+

C1OUT

GP2/C1OUT D

From CVREF Module

GP1/CIN-

GP0/CIN+

C1OUT

GP2/C1OUT D

From CVREF Module

GP1/CIN-

GP0/CIN+

C1OUT

GP2/C1OUT D

From CVREF Module

CIS = 0

CIS = 1

GP1/CIN-

GP0/CIN+

C1OUT

GP2/C1OUT D

GP1/CIN-

GP0/CIN+

C1OUT

GP2/C1OUT D

From CVREF Module

CIS = 0

CIS = 1

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