PIC12F635EST datasheet(76/234 Pages) MICROCHIP

76 / 234 page

PIC12F635/PIC16F636/639

DS41232D-page 74

7.3

Comparator Configuration

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 Figures 7-6 and 7-7.

I/O lines change as a function of the mode and are

designed as follows:

• Analog function (A): digital input buffer is disabled

• Digital function (D): comparator digital output,

overrides port function

• Normal port function (I/O): independent of

comparator

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.

FIGURE 7-6:

COMPARATOR I/O OPERATING MODES (PIC12F635)

Note:

Comparator interrupts should be disabled

during a Comparator mode change to

prevent unintended interrupts.

Comparator Reset (POR Default Value – low power)

Comparator w/o Output and with Internal Reference

CM<2:0> = 000

CM<2:0> = 100

Comparator with Output

Multiplexed Input with Internal Reference and Output

CM<2:0> = 001

CM<2:0> = 101

Comparator without Output

Multiplexed Input with Internal Reference

CM<2:0> = 010

CM<2:0> = 110

Comparator with Output and Internal Reference

Comparator Off (Lowest power)

CM<2:0> = 011

CM<2:0> = 111

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

CIS = Comparator Input Switch (CMCON0<3>)

I/O = Normal port I/O

D = Comparator Digital Output

Note 1:

Reads as ‘0’, unless CINV = 1.

CIN-

CIN+

Off

(1)

COUT (pin) I/O

CIN-

CIN+

COUT

I/O

COUT (pin) I/O

From CVREF Module

CIN-

CIN+

COUT

COUT (pin) D

CIN-

CIN+

COUT

COUT (pin)

From CVREF Module

CIS = 0

CIS = 1

CIN-

CIN+

COUT

COUT (pin)

I/O

CIN-

CIN+

COUT

COUT (pin)

I/O

From CVREF Module

CIS = 0

CIS = 1

CIN-

CIN+

COUT

I/O

COUT (pin) D

From CVREF Module

CIN-

CIN+

Off

(1)

I/O

COUT (pin) I/O

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