PIC16F688-I/ST View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16F688-I/ST

14-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

Microchip Technology 

PIC16F688

FIGURE 7-8:

COMPARATOR VOLTAGE REFERENCE BLOCK DIAGRAM

16 Stages

VDD

VREN

CVREF to

Comparator

Input

8R

R

R

16-1 Analog

MUX

15

14

2

1

0

VR<3:0>(1)

R

R

8R

VRR

VREN

VR<3:0> = 0000

VRR

Note 1:

Care should be taken to ensure VREF remains

within the comparator common mode input

range. See Section 14.0 “Electrical Specifica-

tions” for more detail.

TABLE 7-2: SUMMARY OF REGISTERS ASSOCIATED WITH THE COMPARATOR AND VOLTAGE

REFERENCE MODULES

Name

Bit 7

Bit 6

Bit 5 Bit 4 Bit 3 Bit 2 Bit 1

Bit 0

Value on

POR, BOR

Value on

all other

Resets

ANSEL

CMCON0

CMCON1

INTCON

PIE1

PIR1

PORTA

PORTC

TRISA

TRISC

VRCON

Legend:

ANS7

ANS6 ANS5 ANS4 ANS3 ANS2 ANS1

ANS0 1111 1111 1111 1111

C2OUT C1OUT C2INV C1INV CIS

CM2

CM1

CM0

0000 0000 0000 0000

—

—

—

—

—

— T1GSS C2SYNC ---- --10 ---- --10

GIE

PEIE

T0IE INTE RAIE T0IF INTF

RAIF

0000 000x 0000 000x

EEIE

ADIE RCIE C2IE C1IE OSFIE TXIE TMR1IE 0000 0000 0000 0000

EEIF

ADIF

RCIF C2IF C1IF OSFIF TXIF

TMR1IF 0000 0000 0000 0000

—

—

RA5

RA4

RA3

RA2

RA1

RA0

--x0 x000 --x0 x000

—

—

RC5

RC4

RC3 RC2

RC1

RC0

--xx 0000 --xx 0000

—

—

TRISA5 TRISA4 TRISA3 TRISA2 TRISA1 TRISA0 --11 1111 --11 1111

—

—

TRISC5 TRISC4 TRISC3 TRISC2 TRISC1 TRISC0 --11 1111 --11 1111

VREN

—

VRR

—

VR3

VR2

VR1

VR0

0-0- 0000 0-0- 0000

x = unknown, u = unchanged, – = unimplemented, read as ‘0’. Shaded cells are not used for comparator.

DS41203D-page 64

© 2007 Microchip Technology Inc.

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