PIC18F23K20-ESLASHML datasheet(287/456 Pages) MICROCHIP

287 / 456 page

 2010 Microchip Technology Inc.

DS41303G-page 287

PIC18F2XK20/4XK20

20.8

Additional Comparator Features

There are two additional comparator features:

• Simultaneous read of comparator outputs

• Internal reference selection

20.8.1

SIMULTANEOUS COMPARATOR

OUTPUT READ

The MC1OUT and MC2OUT bits of the CM2CON1

The ability to read both outputs simultaneously from a

single register eliminates the timing skew of reading

separate registers.

20.8.2

INTERNAL REFERENCE

SELECTION

There are two internal voltage references available to

the non-inverting input of each comparator. One of

these is the 1.2V Fixed Voltage Reference (FVR) and

the other is the variable Comparator Voltage Reference

(CVREF). The CxRSEL bit of the CM2CON register

determines which of these references is routed to the

Comparator Voltage reference output (CXVREF). Fur-

ther routing to the comparator is accomplished by the

CxR bit of the CMxCON0 register. See Section 21.1

“Comparator Voltage Reference” and Figure 20-2

and Figure 20-3 for more detail.

Note 1: Obtaining the status of C1OUT or C2OUT

by reading CM2CON1 does not affect the

comparator interrupt mismatch registers.

CM2CON1: COMPARATOR 2 CONTROL REGISTER 1

R-0

R/W-0

U-0

MC1OUT

MC2OUT

C1RSEL

C2RSEL

—

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

MC1OUT: Mirror Copy of C1OUT bit

bit 6

MC2OUT: Mirror Copy of C2OUT bit

bit 5

C1RSEL: Comparator C1 Reference Select bit

= CVREF routed to C1VREF input

= FVR (1.2 Volt fixed voltage reference) routed to C1VREF input

bit 4

C2RSEL: Comparator C2 Reference Select bit

= CVREF routed to C2VREF input

= FVR (1.2 Volt fixed voltage reference) routed to C2VREF input

bit 3-0

Unimplemented: Read as ‘0’

PIC18F23K20-E/ML Datasheet(PDF) 287 Page - Microchip Technology

PIC18F23K20-E/ML Datasheet(HTML) 287 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

Datasheet Download

Link URL