12F629 datasheet(37/136 Pages) MICROCHIP

37 / 136 page

 2010 Microchip Technology Inc.

DS41190G-page 37

PIC12F629/675

6.0

COMPARATOR MODULE

The PIC12F629/675 devices have one analog

comparator. The inputs to the comparator are

multiplexed with the GP0 and GP1 pins. There is an

on-chip Comparator Voltage Reference that can also

be applied to an input of the comparator. In addition,

GP2 can be configured as the comparator output.

The Comparator Control Register (CMCON), shown

in Register 6-1, contains the bits to control the

comparator.

CMCON: COMPARATOR CONTROL REGISTER (ADDRESS: 19h)

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:

1 = VIN+ > VIN-

0 = VIN+ < VIN-

When CINV = 1:

1 = VIN+ < VIN-

0 = VIN+ > VIN-

bit 5

Unimplemented: Read as ‘0’

bit 4

CINV: Comparator Output Inversion bit

1 = Output inverted

0 = Output not inverted

bit 3

CIS: Comparator Input Switch bit

When CM2:CM0 = 110 or 101:

1 = VIN- connects to CIN+

0 = VIN- connects to CIN-

bit 2-0

CM2:CM0: Comparator Mode bits

Figure 6-2 shows the Comparator modes and CM2:CM0 bit settings

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