Datasheet

ManualsBrandsMICROCHIP TECHNOLOGY ManualsMicrocontrollers, Microprocessors & QuartzesEmbedded microcontroller SOIC 14 8-Bit 20 MHz I/O number 12

PIC16F688

FIGURE 7-8: COMPARATOR VOLTAGE REFERENCE BLOCK DIAGRAM

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 ANS7 ANS6 ANS5 ANS4

ANS3 ANS2 ANS1 ANS0 1111 1111 1111 1111

CMCON0 C2OUT C1OUT

C2INV C1INV CIS CM2 CM1 CM0 0000 0000 0000 0000

CMCON1

— — — — — — T1GSS C2SYNC ---- --10 ---- --10

INTCON GIE PEIE

T0IE INTE RAIE T0IF INTF RAIF 0000 000x 0000 000x

PIE1

EEIE ADIE RCIE C2IE C1IE OSFIE TXIE TMR1IE 0000 0000 0000 0000

PIR1

EEIF ADIF RCIF C2IF C1IF OSFIF TXIF TMR1IF 0000 0000 0000 0000

PORTA

— — RA5 RA4 RA3 RA2 RA1 RA0 --x0 x000 --x0 x000

PORTC

— — RC5 RC4 RC3 RC2 RC1 RC0 --xx 0000 --xx 0000

TRISA

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

TRISC

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

VRCON VREN

—VRR— VR3 VR2 VR1 VR0 0-0- 0000 0-0- 0000

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

VRR

VR<3:0>

(1)

16-1 Analog

8R R R R R

CVREF to

16 Stages

Comparator

Input

VREN

VDD

MUX

VR<3:0> = 0000

VREN

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.