PIC18F-LF1XK50 MICROCHIP [Microchip Technology], PIC18F-LF1XK50 Datasheet - Page 246

• Manufacturer Part Number: PIC18F-LF1XK50
• Description: 20-Pin USB Flash Microcontrollers
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18F/LF1XK50
21.2
The FVR reference is a stable fixed voltage reference,
independent of V
1.024V. This reference can be enabled by setting the
FVR1EN bit of the REFCON0 register to ‘1’. The FVR
voltage reference can be routed to the comparators or
an ADC input channel.
FIGURE 21-1:
DS41350E-page 246
V
FVR Reference Module
REF
V
REF
-
FVR1
+
V
DD
DD
, with a nominal output voltage of
D1PSS<1:0> = 01
VOLTAGE REFERENCE BLOCK DIAGRAM
D1PSS<1:0> = 10
D1PSS<1:0> = 00
D1LPS
D1EN
D1LPS
D1EN
D1NSS = 1
D1NSS = 0
32 Steps
Preliminary
R
R
R
R
R
R
R
R
FVR1S<1:0>
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
FVR1ST stable bit of the REFCON0 register also
indicates that the FVR reference has been operating long
enough to be stable. See
Specifications”
DAC1R<4:0>
FVR1EN
FVR1ST
2
FVR STABILIZATION PERIOD
for the minimum delay requirement.
DAC1OE
+
_
X
X
X
1.024V Fixed
Reference
1
2
4
 2010 Microchip Technology Inc.
CV
Section 27.0 “Electrical
REF
V
REF
pin
FVR