PIC16F946 Datasheet, PDF (104/274 Pages) Microchip Technology – 64-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt Technology

PIC16F946
REGISTER 8-3:
VRCON – VOLTAGE REFERENCE CONTROL REGISTER (ADDRESS: 9Dh)
R/W-0
U-0
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
VREN
—
VRR
—
VR3
VR2
VR1
VR0
bit 7
bit 0
bit 7
bit 6
bit 5
bit 4
bit 3-0
VREN: CVREF Enable bit
1 = CVREF circuit powered on
0 = CVREF circuit powered down, no IDD drain and CVREF = VSS.
Unimplemented: Read as ‘0’
VRR: CVREF Range Selection bit
1 = Low range
0 = High range
Unimplemented: Read as ‘0’
VR<3:0>: 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
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
TABLE 8-2: REGISTERS ASSOCIATED WITH COMPARATOR MODULE
Address 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
0Bh/8Bh
0Dh
9Ch
97h
85h
8Dh
9Dh
Legend:
INTCON
GIE
PEIE
T0IE
INTE
RBIE
T0IF
INTF
RBIF 0000 000x 0000 000x
PIR2
OSFIF C2IF
C1IF
LCDIF
—
LVDIF
—
CCP2IF 0000 -0-0 0000 -0-0
CMCON0 C2OUT C1OUT C2INV C1INV
CIS
CM2
CM1
CM0 0000 0000 0000 0000
CMCON1
—
—
—
—
—
—
T1GSS C2SYNC ---- --10 ---- --10
TRISA
TRISA7 TRISA6 TRISA5 TRISA4 TRISA3 TRISA2 TRISA1 TRISA0 1111 1111 1111 1111
PIE2
OSFIE C2IE
C1IE
LCDIE
—
LVDIE
—
CCP2IE 0000 -0-0 0000 -0-0
VRCON
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 by the comparator or Comparator Voltage
Reference module.
DS41265A-page 102
Preliminary
© 2005 Microchip Technology Inc.