PIC12F1516 MICROCHIP [Microchip Technology], PIC12F1516 Datasheet - Page 137

• Manufacturer Part Number: PIC12F1516
• Description: 28/40/44-Pin Flash Microcontrollers with nanoWatt XLP Technology
• Manufacturer: MICROCHIP [Microchip Technology]

14.0
The Fixed Voltage Reference, or FVR, is a stable
voltage reference, independent of V
2.048V or 4.096V selectable output levels. The output
of the FVR can be configured to supply a reference
voltage to the following:
• ADC input channel
• ADC positive reference
• Comparator positive input
The FVR can be enabled by setting the FVREN bit of
the FVRCON register.
FIGURE 14-1:
TABLE 14-1:
 2011 Microchip Technology Inc.
HFINTOSC
BOR
LDO
Peripheral
FIXED VOLTAGE REFERENCE
(FVR)
FOSC<2:0> = 100 and
IRCF<3:0> = 000x
BOREN<1:0> = 11
BOREN<1:0> = 10 and BORFS = 1
BOREN<1:0> = 01 and BORFS = 1
All PIC16F151X devices, when
VREGPM = 1 and not in Sleep
Any peripheral requiring
PERIPHERALS REQUIRING THE FIXED VOLTAGE REFERENCE (FVR)
the Fixed Reference
FVREN
(See
VOLTAGE REFERENCE BLOCK DIAGRAM
Table
ADFVR<1:0>
Conditions
14-1)
DD
, with 1.024V,
2
+
-
Preliminary
1.024V Fixed
Reference
INTOSC is active and device is not in Sleep
BOR always enabled
BOR disabled in Sleep mode, BOR Fast Start enabled.
BOR under software control, BOR Fast Start enabled
The device runs off of the low-power regulator when in Sleep
mode.
x1
x2
x4
14.1
The output of the FVR supplied to the ADC module is
routed through a programmable gain amplifier. The
amplifier can be configured to amplify the reference
voltage by 1x, 2x or 4x, to produce the three possible
voltage levels.
The ADFVR<1:0> bits of the FVRCON register are
used to enable and configure the gain amplifier settings
for the reference supplied to the ADC module. Refer-
ence
(ADC) Module”
14.2
When the Fixed Voltage Reference module is enabled, it
requires time for the reference and amplifier circuits to
stabilize. Once the circuits stabilize and are ready for use,
the FVRRDY bit of the FVRCON register will be set. See
Section 25.0 “Electrical Specifications”
minimum delay requirement.
FVRRDY
PIC16(L)F1516/7/8/9
Section 16.0 “Analog-to-Digital Converter
Independent Gain Amplifiers
FVR Stabilization Period
for additional information.
Description
(To ADC Module)
FVR BUFFER1
DS41452B-page 137
for the