PIC12F635ESS datasheet(81/234 Pages) MICROCHIP

81 / 234 page

DS41232D-page 79

PIC12F635/PIC16F636/639

7.7

Operation During Sleep

The comparator, if enabled before entering Sleep mode,

remains active during Sleep. The additional current

consumed by the comparator is shown separately in the

Section 15.0

“Electrical

Specifications”.

the

comparator is not used to wake the device, power

consumption can be minimized while in Sleep mode by

turning off the comparator. The comparator is turned off

by selecting mode CM<2:0> = 000 or CM<2:0> = 111

of the CMCON0 register.

A change to the comparator output can wake-up the

device from Sleep. To enable the comparator to wake

the device from Sleep, the CxIE bit of the PIE1 register

and the PEIE bit of the INTCON register must be set.

The instruction following the Sleep instruction always

executes following a wake from Sleep. If the GIE bit of

the INTCON register is also set, the device will then

execute the Interrupt Service Routine.

7.8

Effects of a Reset

A device Reset forces the CMCON0 and CMCON1

registers to their Reset states. This forces the Compar-

ator module to be in the Comparator Reset mode

(CM<2:0> = 000). Thus, all comparator inputs are

analog inputs with the comparator disabled to consume

the smallest current possible.

CMCON0: COMPARATOR CONFIGURATION REGISTER (PIC12F635)

U-0

R-0

U-0

R/W-0

—COUT

—

CINV

CIS

CM2

CM1

CM0

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7

Unimplemented: Read as ‘0’

bit 6

COUT: Comparator Output bit

When CINV = 0:

= VIN+ > VIN-

= VIN+ < VIN-

When CINV = 1:

= VIN+ < VIN-

= VIN+ > VIN-

bit 5

Unimplemented: Read as ‘0’

bit 4

CINV: Comparator Output Inversion bit

= Output inverted

= Output not inverted

bit 3

CIS: Comparator Input Switch bit

When CM<2:0> = 110 or 101:

= CIN+ connects to VIN-

= CIN- connects to VIN-

When CM<2:0> = 0xx or 100 or 111:

CIS has no effect.

bit 2-0

CM<2:0>: Comparator Mode bits (See Figure 7-5)

000

= CIN pins are configured as analog, COUT pin configured as I/O, Comparator output turned off

001

= CIN pins are configured as analog, COUT pin configured as Comparator output

010

= CIN pins are configured as analog, COUT pin configured as I/O, Comparator output available internally

011

= CIN- pin is configured as analog, CIN+ pin is configured as I/O, COUT pin configured as

Comparator output, CVREF is non-inverting input

100

= CIN- pin is configured as analog, CIN+ pin is configured as I/O, COUT pin is configured as I/O, Comparator output

available internally, CVREF is non-inverting input

101

= CIN pins are configured as analog and multiplexed, COUT pin is configured as

Comparator output, CVREF is non-inverting input

110

= CIN pins are configured as analog and multiplexed, COUT pin is configured as I/O,

Comparator output available internally, CVREF is non-inverting input

111

= CIN pins are configured as I/O, COUT pin is configured as I/O, Comparator output disabled, Comparator off.

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