PIC12F635ESLASHSS datasheet(63/196 Pages) MICROCHIP

63 / 196 page

Preliminary

DS41232B-page 61

PIC12F635/PIC16F636/639

7.0

COMPARATOR MODULE

The

comparator

module

contains

two

analog

comparators. The inputs to the comparators are

multiplexed with I/O port pins RA0, RA1, RC0 and RC1,

while the outputs are multiplexed to pins RA2 and RC4.

An on-chip Comparator Voltage Reference (CVREF)

can also be applied to the inputs of the comparators.

The CMCON0 register (Register 7-1) controls the

comparator input and output multiplexers. A block

diagram of the various comparator configurations is

shown in Figure 7-4.

CMCON0 – COMPARATOR CONTROL 0 REGISTER (ADDRESS: 19h)

Note:

The PIC12F635 has only 1 comparator.

The

comparator

the

PIC12F635

behaves

comparator

the

PIC16F636/639.

R-0

R/W-0

C2OUT(1) C1OUT(2)

C2INV(1)

C1INV(2)

CIS

CM2

CM1

CM0

bit 7

bit 0

bit 7

C2OUT: Comparator 2 Output bit(1)

When C2INV = 0:

= C2 VIN+ > C2 VIN-

= C2 VIN+ < C2 VIN-

When C2INV = 1:

= C2 VIN+ < C2 VIN-

= C2 VIN+ > C2 VIN-

bit 6

C1OUT: Comparator 1 Output bit(2)

When C1INV = 0:

= C1 VIN+ > C1 VIN-

= C1 VIN+ < C1 VIN-

When C1INV = 1:

= C1 VIN+ < C1 VIN-

= C1 VIN+ > C1 VIN-

bit 5

C2INV: Comparator 2 Output Inversion bit(1)

= C2 output inverted

= C2 output not inverted

bit 4

C1INV: Comparator 1 Output Inversion bit(2)

= C1 output inverted

= C1 output not inverted

bit 3

CIS: Comparator Input Switch bit

When CM<2:0> = 010:

=C1 VIN- connects to RA0

C2 VIN- connects to RC0

=C1 VIN- connects to RA1

C2 VIN- connects to RC1

When CM<2:0> = 001:

=C1 VIN- connects to RA0

=C1 VIN- connects to RA1

bit 2-0

CM<2:0>: Comparator Mode bits

Figure 7-4 shows the Comparator modes and CM<2:0> bit settings.

Note 1: PIC16F636/639 only. Reads as ‘0’ for PIC12F635.

2: PIC12F635 bit names are COUT and CINV.

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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