PIC18F23K20-ESLASHML datasheet(290/456 Pages) MICROCHIP

290 / 456 page

PIC18F2XK20/4XK20

DS41303G-page 290

 2010 Microchip Technology Inc.

21.2

FVR Reference Module

The FVR reference is a stable fixed voltage reference,

independent of VDD, with a nominal output voltage of

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.

21.2.1

FVR STABILIZATION PERIOD

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

stable.

See

Section 26.0

“Electrical

Characteristics” for the minimum delay requirement.

FIGURE 21-1:

VOLTAGE REFERENCE BLOCK DIAGRAM

CVR<3:0>

CVREN

CVRSS = 0

VDD

VREF+

CVRSS = 1

CVRSS = 0

VREF-

CVRSS = 1

16 Steps

CVRR

CVREF

1.2 Volt Fixed

Reference

FVRST

FVR

FVREN

From HVLD and

BOR circuits

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