PIC12F635ESS datasheet(78/234 Pages) MICROCHIP

78 / 234 page

PIC12F635/PIC16F636/639

DS41232D-page 76

7.4

Comparator Control

The CMCON0 register (Register 7-1) provides access

to the following comparator features:

• Mode selection

• Output state

• Output polarity

• Input switch

7.4.1

COMPARATOR OUTPUT STATE

Each comparator state can always be read internally

via the CxOUT bit of the CMCON0 register. The com-

parator state may also be directed to the CxOUT pin in

the following modes:

PIC12F635

• CM<2:0> = 001

• CM<2:0> = 011

• CM<2:0> = 101

PIC16F636/639

• CM<2:0> = 110

When one of the above modes is selected, the

associated TRIS bit of the CxOUT pin must be cleared.

7.4.2

COMPARATOR OUTPUT POLARITY

Inverting the output of a comparator is functionally

equivalent to swapping the comparator inputs. The

polarity of a comparator output can be inverted by set-

ting the CXINV bit of the CMCON0 register. Clearing

CXINV results in a non-inverted output. A complete

table showing the output state versus input conditions

and the polarity bit is shown in Table 7-1.

TABLE 7-1:

OUTPUT STATE VS. INPUT

CONDITIONS

7.4.3

COMPARATOR INPUT SWITCH

The inverting input of the comparators may be switched

between two analog pins in the following modes:

PIC12F635

•CM<2:0> = 101

•CM<2:0> = 110

PIC16F636/639

•CM<2:0> = 001 (Comparator C1 only)

•CM<2:0> = 010 (Comparators C1 and C2)

In the above modes, both pins remain in Analog mode

regardless of which pin is selected as the input. The

CIS bit of the CMCON0 register controls the comparator

input switch.

Input Conditions

CxINV

CxOUT

VIN- > VIN+

VIN- < VIN+

VIN- > VIN+

VIN- < VIN+

Note:

CxOUT refers to both the register bit and

output pin.

PIC12F635ESS датащи(PDF) 78 Page - Microchip Technology

PIC12F635ESS датащи(HTML) 78 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL