16F628 datasheet(63/168 Pages) MICROCHIP

63 / 168 page

 2002 Microchip Technology Inc.

Preliminary

DS40044A-page 61

PIC16F627A/628A/648A

10.0 COMPARATOR MODULE

The

Comparator

module

contains

two

analog

comparators. The inputs to the comparators are

multiplexed with the RA0 through RA3 pins. The on-

chip Voltage Reference (Section 11.0) can also be an

input to the comparators.

The CMCON register, shown in Register 10-1, controls

the comparator input and output multiplexers. A block

diagram of the comparator is shown in Figure 10-1.

CMCON REGISTER (ADDRESS: 01Fh)

R-0

R/W-0

C2OUT

C1OUT

C2INV

C1INV

CIS

CM2

CM1

CM0

bit 7

bit 0

bit 7

C2OUT: Comparator 2 Output

When C2INV = 0:

1 = C2 VIN+ > C2 VIN-

0 = C2 VIN+ < C2 VIN-

When C2INV = 1:

1 = C2 VIN+ < C2 VIN-

0 = C2 VIN+ > C2 VIN-

bit 6

C1OUT: Comparator 1 Output

When C1INV = 0:

1 = C1 VIN+ > C1 VIN-

0 = C1 VIN+ < C1 VIN-

When C1INV = 1:

1 = C1 VIN+ < C1 VIN-

0 = C1 VIN+ > C1 VIN-

bit 5

C2INV: Comparator 2 Output Inversion

1 = C2 Output inverted

0 = C2 Output not inverted

bit 4

C1INV: Comparator 1 Output Inversion

1 = C1 Output inverted

0 = C1 Output not inverted

bit 3

CIS: Comparator Input Switch

When CM2:CM0: = 001

Then:

1 = C1 VIN- connects to RA3

0 = C1 VIN- connects to RA0

When CM2:CM0 = 010

Then:

1 = C1 VIN- connects to RA3

C2 V

IN- connects to RA2

0 = C1 VIN- connects to RA0

C2 V

IN- connects to RA1

bit 2-0

CM2:CM0: Comparator Mode

Figure 10-1 shows the Comparator modes and CM2:CM0 bit settings

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

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