Datasheet

PIC16F684
DS41202F-page 64 © 2007 Microchip Technology Inc.
FIGURE 8-8: COMPARATOR VOLTAGE REFERENCE BLOCK DIAGRAM
TABLE 8-2: 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 0000 0000 0000
PIE1
EEIE ADIE CCP1IE C2IE C1IE OSFIE TMR2IE TMR1IE 0000 0000 0000 0000
PIR1
EEIF ADIF CCP1IF C2IF C1IF OSFIF TMR2IF TMR1IF 0000 0000 0000 0000
PORTA
— — RA5 RA4 RA3 RA2 RA1 RA0 --x0 x000 --uu uu00
PORTC
— — RC5 RC4 RC3 RC2 RC1 RC0 --xx 0000 --uu uu00
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
8R
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
0
1
2
14
15
Note 1: Care should be taken to ensure VREF remains
within the comparator common mode input range.
See Section 15.0 “Electrical Specifications” for
more detail.