PIC18F23K20-ESLASHML datasheet(294/456 Pages) MICROCHIP

294 / 456 page

PIC18F2XK20/4XK20

DS41303G-page 294

 2010 Microchip Technology Inc.

22.1

Operation

When the HLVD module is enabled, a comparator uses

an internally generated reference voltage as the set

point. The set point is compared with the trip point,

where each node in the resistor divider represents a

trip point voltage. The “trip point” voltage is the voltage

level at which the device detects a high or low-voltage

event, depending on the configuration of the module.

When the supply voltage is equal to the trip point, the

voltage tapped off of the resistor array is equal to the

internal reference voltage generated by the voltage

reference module. The comparator then generates an

interrupt signal by setting the HLVDIF bit.

The trip point voltage is software programmable to any

one of 16 values. The trip point is selected by

programming the HLVDL<3:0> bits of the HLVDCON

The HLVD module has an additional feature that allows

the user to supply the trip voltage to the module from

an external source. This mode is enabled when bits

HLVDL<3:0> are set to ‘1111’. In this state, the

comparator input is multiplexed from the external input

pin, HLVDIN. This gives users flexibility because it

allows them to configure the High/Low-Voltage Detect

interrupt to occur at any voltage in the valid operating

range.

FIGURE 22-1:

HLVD MODULE BLOCK DIAGRAM (WITH EXTERNAL INPUT)

Set

VDD

HLVDEN

HLVDCON

HLVDIN

HLVDL<3:0>

HLVDIN

VDD

Externally Generated

Trip Point

HLVDIF

HLVDEN

BOREN

Internal Voltage

Reference

VDIRMAG

PIC18F23K20-E/ML Datasheet(PDF) 294 Page - Microchip Technology

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