PIC16F631 Datasheet, PDF (108/294 Pages) Microchip Technology – 20-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

PIC16F631/677/685/687/689/690
REGISTER 8-5: VRCON: VOLTAGE REFERENCE CONTROL REGISTER
R/W-0
R/W-0
R/W-0
R/W-0
R/S-0
R/S-0
U-0
C1VREN
C2VREN
VRR
VP6EN
VR3
VR2
VR1
bit 7
U-0
VR0
bit 0
Legend:
R = Readable bit
-n = Value at POR
S = Bit is set only
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 7
bit 6
bit 5
bit 4
bit 3-0
C1VREN: Comparator C1 Voltage Reference Enable bit
1 = CVREF circuit powered on and routed to C1VREF input of Comparator C1
0 = 0.6 Volt constant reference routed to C1VREF input of Comparator C1
C2VREN: Comparator C2 Voltage Reference Enable bit
1 = CVREF circuit powered on and routed to C2VREF input of Comparator C2
0 = 0.6 Volt constant reference routed to C2VREF input of Comparator C2
VRR: Comparator Voltage Reference CVREF Range Selection bit
1 = Low Range
0 = High Range
VP6EN: 0.6V Reference Enable bit
1 = Enabled
0 = Disabled
VR<3:0>: Comparator Voltage Reference CVREF Value Selection 0 ≤ VR<3:0> ≤ 15
When VRR = 1: CVREF = (VR<3:0>/24) * VDD
When VRR = 0: CVREF = VDD/4 + (VR<3:0>/32) * VDD
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
CM1CON0
CM2CON0
ANS7
C1ON
C2ON
ANS6
C1OUT
C2OUT
ANS5
C1OE
C2OE
ANS4
C1POL
C2POL
ANS3
—
—
ANS2
C1R
C2R
ANS1
C1CH1
C2CH1
ANS0
C1CH0
C2CH0
1111 1111
0000 -000
0000 -000
1111 1111
0000 0000
0000 -000
CM2CON1 MC1OUT MC2OUT —
—
—
— T1GSS C2SYNC 00-- --10 00-- --10
INTCON
PIE2
PIR2
PORTA
PORTC
REFCON
SRCON
GIE
OSFIE
OSFIF
—
RC7
—
SR1
PEIE
C2IE
C2IF
—
RC6
—
SR0
T0IE
C1IE
INTE
EEIE
RABIE
—
T0IF
—
INTF
—
C1IF EEIF
—
—
—
RA5
RA4
RA3
RA2
RA1
RC5
RC4
RC3 RC2
RC1
BGST VRBB VREN VROE CVROE
C1SEN C2REN PULSS PULSR —
RABIF
—
—
RA0
RC0
—
—
0000 000x
0000 ----
0000----
--xx xxxx
xxxx xxxx
--00 000-
0000 00--
0000 000x
0000 ----
0000----
--uu uuuu
uuuu uuuu
--00 000-
0000 00--
TRISA
—
—
TRISA5 TRISA4 TRISA3 TRISA2 TRISA1 TRISA0 --11 1111 --11 1111
TRISC
VRCON
Legend:
TRISC7 TRISC6 TRISC5 TRISC4 TRISC3 TRISC2 TRISC1 TRISC0 1111 1111 1111 1111
C1VREN C2VREN VRR VP6EN VR3
VR2
VR1
VR0
0000 0000 0000 0000
x = unknown, u = unchanged, – = unimplemented, read as ‘0’. Shaded cells are not used for comparator.
DS41262D-page 106
© 2007 Microchip Technology Inc.