PIC16F631_08 Datasheet, PDF (108/306 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
C1VREN
bit 7
R/W-0
C2VREN
R/W-0
VRR
R/W-0
VP6EN
R/W-0
VR3
R/W-0
VR2
R/W-0
VR1
R/W-0
VR0
bit 0
Legend:
R = Readable bit
-n = Value at POR
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 1 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 2 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: 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 bits (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
ANS7
ANS6 ANS5 ANS4 ANS3 ANS2 ANS1
ANS0 1111 1111 1111 1111
CM1CON0 C1ON C1OUT C1OE C1POL —
C1R C1CH1 C1CH0 0000 -000 0000 0000
CM2CON0 C2ON C2OUT C2OE C2POL —
C2R C2CH1 C2CH0 0000 -000 0000 -000
CM2CON1 MC1OUT MC2OUT —
—
—
— T1GSS C2SYNC 00-- --10 00-- --10
INTCON
GIE
PEIE
T0IE INTE RABIE T0IF INTF
RABIF 0000 000x 0000 000x
PIE2
OSFIE
C2IE
C1IE EEIE
—
—
—
—
0000 ---- 0000 ----
PIR2
OSFIF
C2IF
C1IF EEIF
—
—
—
—
0000---- 0000----
PORTA
—
—
RA5
RA4
RA3
RA2
RA1
RA0
--xx xxxx --uu uuuu
PORTC
RC7
RC6
RC5
RC4
RC3 RC2
RC1
RC0
xxxx xxxx uuuu uuuu
SRCON
SR1
SR0 C1SEN C2REN PULSS PULSR —
—
0000 00-- 0000 00--
TRISA
—
—
TRISA5 TRISA4 TRISA3 TRISA2 TRISA1 TRISA0 --11 1111 --11 1111
TRISC
TRISC7 TRISC6 TRISC5 TRISC4 TRISC3 TRISC2 TRISC1 TRISC0 1111 1111 1111 1111
VRCON
C1VREN C2VREN VRR VP6EN VR3 VR2
VR1
VR0
0000 0000 0000 0000
Legend: x = unknown, u = unchanged, – = unimplemented, read as ‘0’. Shaded cells are not used for comparator.
DS41262E-page 106
© 2008 Microchip Technology Inc.