PIC24FJ64GA705 Datasheet, PDF (327/412 Pages) –

PIC24FJ256GA705 FAMILY
28.0 HIGH/LOW-VOLTAGE DETECT
(HLVD)
Note:
This data sheet summarizes the features
of this group of PIC24F devices. It is
not intended to be a comprehensive
reference source. For more information
on the High/Low-Voltage Detect, refer to
the “dsPIC33/PIC24 Family Reference
Manual”, “High-Level Integration
with Programmable High/Low-Voltage
Detect (HLVD)” (DS39725), which is
available from the Microchip web site
(www.microchip.com). The information in
this data sheet supersedes the
information in the FRM.
The High/Low-Voltage Detect (HLVD) module is a
programmable circuit that allows the user to specify
both the device voltage trip point and the direction of
change.
An interrupt flag is set if the device experiences an
excursion past the trip point in the direction of change.
If the interrupt is enabled, the program execution will
branch to the interrupt vector address and the software
can then respond to the interrupt. The LVDIF flag may
be set during a POR or BOR event. The firmware
should clear the flag before the application uses it for
the first time, even if the interrupt was disabled.
The HLVD Control register (see Register 28-1)
completely controls the operation of the HLVD module.
This allows the circuitry to be “turned off” by the user
under software control, which minimizes the current.
FIGURE 28-1:
HIGH/LOW-VOLTAGE DETECT (HLVD) MODULE BLOCK DIAGRAM
Externally Generated
Trip Point
VDD
HLVDIN
VDD
HLVDL<3:0>
HLVDEN VDIR
Set
LVDIF
HLVDEN
Band Gap
1.2V Typical
 2016 Microchip Technology Inc.
DS30010118B-page 327