Datasheet

 2010-2013 Microchip Technology Inc. DS40001430E-page 85

PIC16(L)F720/721

10.0 FIXED VOLTAGE REFERENCE

This device contains an internal voltage regulator. To

provide a reference for the regulator, a fixed voltage

reference is provided. This fixed voltage is also user

accessible via an A/D converter channel.

User level fixed voltage functions are controlled by the

FVRCON register, which is shown in Register 10-1.

FIGURE 10-1: VOLTAGE REFERENCE BLOCK DIAGRAM

TABLE 10-1: PERIPHERALS REQUIRING THE FIXED VOLTAGE REFERENCE (FVR)

Peripheral Conditions Description

HFINTOSC FOSC = 1 EC on CLKIN pin.

BOR

BOREN<1:0> = 11 BOR always enabled.

BOREN<1:0> = 10 and BORFS = 1 BOR disabled in Sleep mode, BOR Fast Start enabled.

BOREN<1:0> = 01 and BORFS = 1 BOR under software control, BOR Fast Start enabled.

IVR All PIC16F720/721 devices, when

VREGPM1 = 1 and not in Sleep

The device runs off of the Power-Save mode regulator when

in Sleep mode.

FVR

(To ADC Module)

1.024V Fixed

Reference

FVREN

FVRRDY

ADFVR<1:0>

Any peripheral requiring

the Fixed Reference

(See Table 10-1)