PIC18F23K20-E/MLQTP MICROCHIP [Microchip Technology], PIC18F23K20-E/MLQTP Datasheet - Page 282

• Manufacturer Part Number: PIC18F23K20-E/MLQTP
• Description: 28/40/44-Pin Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18F2XK20/4XK20
21.2
The FVR reference is a stable fixed voltage reference,
independent of V
1.2V. This reference can be enabled by setting the
FVREN bit of the CVRCON2 register to ‘1’. The FVR
defaults to on when any one or more of the HFINTOSC,
HLVD, or BOR functions are enabled. The FVR voltage
reference can be routed to the comparators or an ADC
input channel.
FIGURE 21-1:
DS41303B-page 280
FVR Reference Module
V
V
DD
V
REF
REF
DD
CVREN
, with a nominal output voltage of
+
-
VOLTAGE REFERENCE BLOCK DIAGRAM
From HVLD and
BOR circuits
CVRSS = 0
CVRSS = 1
CVRR
CVRSS = 1
CVRSS = 0
FVREN
16 Steps
Advance Information
8R
R
R
R
R
R
R
R
EN
1.2 Volt Fixed
21.2.1
When the Fixed Voltage Reference module is enabled, it
will require some time for the reference and its amplifier
circuits to stabilize. The user program must include a
small delay routine to allow the module to settle. The
FVRST stable bit of the CVRCON2 register also indicates
that the FVR reference has been operating long enough
to
Characteristics” for the minimum delay requirement.
Reference
8R
be
stable.
CVR<3:0>
FVR STABILIZATION PERIOD
FVR
FVRST
See
© 2007 Microchip Technology Inc.
Section 26.0
CV
REF
“Electrical