PIC16F684 datasheet(60/192 Pages) MICROCHIP

60 / 192 page

PIC16F684

DS41202F-page 58

8.2

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 Figure 8-5. I/O lines

change as a function of the mode and are designated

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 8-5:

COMPARATOR I/O OPERATING MODES

Note:

Comparator interrupts should be disabled

during a Comparator mode change to

prevent unintended interrupts.

C1IN-

VIN-

VIN+

C1IN+

Off(1)

Comparators Reset (POR Default Value)

CM<2:0> = 000

C2IN-

VIN-

VIN+

C2IN+

Off(1)

C1IN-

VIN-

VIN+

C1IN+

C1OUT

Two Independent Comparators

CM<2:0> = 100

C2IN-

VIN-

VIN+

C2IN+

C2OUT

C1IN-

VIN-

VIN+

C1IN+

C1OUT

Two Common Reference Comparators

I/O

CM<2:0> = 011

C2IN-

VIN-

VIN+

C2IN+

C2OUT

C1IN-

VIN-

VIN+

C1IN+

Off(1)

One Independent Comparator

I/O

CM<2:0> = 101

C2IN-

VIN-

VIN+

C2IN+

C2OUT

C1IN-

VIN-

VIN+

C1IN+

Off(1)

Comparators Off (Lowest Power)

I/O

CM<2:0> = 111

C2IN-

VIN-

VIN+

C2IN+

Off(1)

I/O

C1IN-

VIN-

VIN+

C1IN+

C1OUT

Four Inputs Multiplexed to Two Comparators

CM<2:0> = 010

C2IN-

VIN-

VIN+

C2IN+

C2OUT

From

CVREF Module

CIS = 0

CIS = 1

CIS = 0

CIS = 1

C1IN-

VIN-

VIN+

C1OUT(pin)

C1OUT

Two Common Reference Comparators with Outputs

CM<2:0> = 110

C2IN-

VIN-

VIN+

C2IN+

C2OUT

C2OUT(pin)

C1IN-

VIN-

VIN+

C1IN+

C1OUT

Three Inputs Multiplexed to Two Comparators

CM<2:0> = 001

C2IN-

VIN-

VIN+

C2IN+

C2OUT

CIS = 0

CIS = 1

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 CxINV = 1.

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