DVR datasheet(327/416 Pages) MICROCHIP

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DS30010118D-page 327

PIC24FJ256GA705 FAMILY

28.0 HIGH/LOW-VOLTAGE DETECT

(HLVD)

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

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 website

(www.microchip.com). The information in

this

data

sheet

supersedes

the

information in the FRM.

Set

VDD

HLVDEN

HLVDL<3:0>

LVDIN

VDD

Externally Generated

Trip Point

LVDIF

HLVDEN

Band Gap

VDIR

1.2V Typical

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