Microchip Technology MA160014 Data Sheet
PIC18(L)F2X/4XK22
DS41412F-page 344
2010-2012 Microchip Technology Inc.
21.3
Register Definitions: FVR Control
REGISTER 21-1:
VREFCON0: FIXED VOLTAGE REFERENCE CONTROL REGISTER
R/W-0
R/W-0
R/W-0
R/W-1
U-0
U-0
U-0
U-0
FVREN
FVRST
FVRS<1:0>
—
—
—
—
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
u = Bit is unchanged
x = Bit is unknown
-n/n = Value at POR and BOR/Value at all other Resets
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 7
FVREN: Fixed Voltage Reference Enable bit
0
0
= Fixed Voltage Reference is disabled
1
= Fixed Voltage Reference is enabled
bit 6
FVRST: Fixed Voltage Reference Ready Flag bit
0
= Fixed Voltage Reference output is not ready or not enabled
1
= Fixed Voltage Reference output is ready for use
bit 5-4
FVRS<1:0>: Fixed Voltage Reference Selection bits
00
00
= Fixed Voltage Reference Peripheral output is off
01
= Fixed Voltage Reference Peripheral output is 1x (1.024V)
10
= Fixed Voltage Reference Peripheral output is 2x (2.048V)
(1)
11
= Fixed Voltage Reference Peripheral output is 4x (4.096V)
(1)
bit 3-2
Reserved: Read as ‘0’. Maintain these bits clear.
bit 1-0
Unimplemented: Read as ‘0’.
Note 1: Fixed Voltage Reference output cannot exceed V
DD
.
TABLE 21-1:
SUMMARY OF REGISTERS ASSOCIATED WITH FIXED VOLTAGE REFERENCE
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Register
on Page
VREFCON0
FVREN
FVRST
FVRS<1:0>
—
—
—
—
Legend:
— = unimplemented locations, read as ‘0’.
Shaded bits are not used by the FVR module.