PIC16F72X/PIC16LF72X
10.0
FIXED VOLTAGE REFERENCE
This device contains an internal voltage regulator. To
provide a reference for the regulator, a band gap refer-
ence is provided. This band gap is also user accessible
via an A/D converter channel.
User level band gap functions are controlled by the
FVRCON register, which is shown in Register 10-1.
REGISTER 10-1:
R-q
FVRRDY
bit 7
Legend:
R = Readable bit
-n = Value at POR
FVRCON: FIXED VOLTAGE REFERENCE REGISTER
R/W-0
U-0
—
U-0
—
U-0
—
U-0
—
R/W-0
ADFVR1
R/W-0
ADFVR0
bit 0
FVREN
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
q = Value depends on condition
bit 7
FVRRDY
(1)
:
Fixed Voltage Reference Ready Flag bit
0
= Fixed Voltage Reference output is not active or stable
1
= Fixed Voltage Reference output is ready for use
FVREN
(2)
:
Fixed Voltage Reference Enable bit
0
= Fixed Voltage Reference is disabled
1
= Fixed Voltage Reference is enabled
Unimplemented:
Read as ‘0’
ADFVR<1:0>:
A/D Converter Fixed Voltage Reference Selection bits
00
= A/D Converter Fixed Voltage Reference Peripheral output is off.
01
= A/D Converter Fixed Voltage Reference Peripheral output is 1x (1.024V)
10
= A/D Converter Fixed Voltage Reference Peripheral output is 2x (2.048V)
(2)
11
= A/D Converter Fixed Voltage Reference Peripheral output is 4x (4.096V)
(2)
FVRRDY is always ‘1’ for the PIC16F72X devices.
Fixed Voltage Reference output cannot exceed V
DD
.
bit 6
bit 5-2
bit 1-0
Note 1:
2:
©
2009 Microchip Technology Inc.
DS41341E-page 109
MICROCHIP [ MICROCHIP TECHNOLOGY ]
