PIC16F720_13 Datasheet, PDF (85/254 Pages) Microchip Technology – 20-Pin Flash Microcontrollers

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
ADFVR<1:0>
2
FVREN
Any peripheral requiring
the Fixed Reference
(See Table 10-1)
x1
x2
x4
1.024V Fixed
Reference
+
FVRRDY
-
FVR
(To ADC Module)
TABLE 10-1: PERIPHERALS REQUIRING THE FIXED VOLTAGE REFERENCE (FVR)
Peripheral
Conditions
Description
HFINTOSC
BOR
IVR
FOSC = 1
BOREN<1:0> = 11
BOREN<1:0> = 10 and BORFS = 1
BOREN<1:0> = 01 and BORFS = 1
All PIC16F720/721 devices, when
VREGPM1 = 1 and not in Sleep
EC on CLKIN pin.
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 Power-Save mode regulator when
in Sleep mode.
 2010-2013 Microchip Technology Inc.
DS41430D-page 85