PIC16F882 datasheet(93/338 Pages) MICROCHIP

93 / 338 page

 2006-2012 Microchip Technology Inc.

DS41291G-page 93

PIC16F882/883/884/886/887

8.5

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 17.0 “Electrical Specifications”. If the

comparator is not used to wake the device, power

consumption can be minimized while in Sleep mode by

turning off the comparator. Each comparator is turned off

by clearing the CxON bit of the CMxCON0 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 PIE2 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.

8.6

Effects of a Reset

A device Reset forces the CMxCON0 and CM2CON1

registers to their Reset states. This forces both

comparators and the voltage references to their Off

states.

CM1CON0: COMPARATOR C1 CONTROL REGISTER 0

R/W-0

R-0

R/W-0

U-0

R/W-0

C1ON

C1OUT

C1OE

C1POL

—

C1R

C1CH1

C1CH0

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

C1ON: Comparator C1 Enable bit

1 = Comparator C1 is enabled

0 = Comparator C1 is disabled

bit 6

C1OUT: Comparator C1 Output bit

If C1POL = 1 (inverted polarity):

C1OUT = 0 when C1VIN+ > C1VIN-

C1OUT = 1 when C1VIN+ < C1VIN-

If C1POL = 0 (non-inverted polarity):

C1OUT = 1 when C1VIN+ > C1VIN-

C1OUT = 0 when C1VIN+ < C1VIN-

bit 5

C1OE: Comparator C1 Output Enable bit

1 = C1OUT is present on the C1OUT pin(1)

0 = C1OUT is internal only

bit 4

C1POL: Comparator C1 Output Polarity Select bit

1 = C1OUT logic is inverted

0 = C1OUT logic is not inverted

bit 3

Unimplemented: Read as ‘0’

bit 2

C1R: Comparator C1 Reference Select bit (non-inverting input)

1 = C1VIN+ connects to C1VREF output

0 = C1VIN+ connects to C1IN+ pin

bit 1-0

C1CH<1:0>: Comparator C1 Channel Select bit

00 = C12IN0- pin of C1 connects to C1VIN-

01 = C12IN1- pin of C1 connects to C1VIN-

10 = C12IN2- pin of C1 connects to C1VIN-

11 = C12IN3- pin of C1 connects to C1VIN-

Note 1:

Comparator output requires the following three conditions: C1OE = 1, C1ON = 1 and corresponding port

TRIS bit = 0.

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