PIC12F683-ESLASHMDQTP datasheet(56/176 Pages) MICROCHIP

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PIC12F683

DS41211D-page 54

8.4

Comparator Control

The CMCON0 register (Register 8-1) provides access

to the following comparator features:

• Mode selection

• Output state

• Output polarity

• Input switch

8.4.1

COMPARATOR OUTPUT STATE

The Comparator state can always be read internally via

the COUT bit of the CMCON0 register. The comparator

state may also be directed to the COUT pin in the

following modes:

• CM<2:0> = 001

• CM<2:0> = 011

• CM<2:0> = 101

When one of the above modes is selected, the associ-

ated TRIS bit of the COUT pin must be cleared.

8.4.2

COMPARATOR OUTPUT POLARITY

Inverting the output of the comparator is functionally

equivalent to swapping the comparator inputs. The

polarity of the comparator output can be inverted by

setting the CINV bit of the CMCON0 register. Clearing

CINV results in a non-inverted output. A complete table

showing the output state versus input conditions and

the polarity bit is shown in Table 8-1.

TABLE 8-1:

OUTPUT STATE VS. INPUT

CONDITIONS

8.4.3

COMPARATOR INPUT SWITCH

The inverting input of the comparator may be switched

between two analog pins in the following modes:

• CM<2:0> = 101

• CM<2:0> = 110

In the above modes, both pins remain in analog mode

regardless of which pin is selected as the input. The

CIS bit of the CMCON0 register controls the comparator

input switch.

8.5

Comparator Response Time

The comparator output is indeterminate for a period of

time after the change of an input source or the selection

of a new reference voltage. This period is referred to as

the response time. The response time of the

comparator differs from the settling time of the voltage

reference. Therefore, both of these times must be

considered when determining the total response time

to a comparator input change. See the Comparator and

Voltage Reference Specifications in Section 15.0

“Electrical Specifications” for more details.

Input Conditions

CINV

COUT

VIN- > VIN+

VIN- < VIN+

VIN- > VIN+

VIN- < VIN+

Note:

COUT refers to both the register bit and

output pin.

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