PIC24FV32KA304 datasheet(74/364 Pages) MICROCHIP

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PIC24FV32KA304 FAMILY

DS39995D-page 74

 2011-2013 Microchip Technology Inc.

7.5.2

DETECTING BOR

When BOR is enabled, the BOR bit (RCON<1>) is

always reset to ‘1’ on any BOR or POR event. This

makes it difficult to determine if a BOR event has

occurred just by reading the state of BOR alone. A

more reliable method is to simultaneously check the

state of both POR and BOR. This assumes that the

POR and BOR bits are reset to ‘0’ in the software

immediately after any POR event. If the BOR bit is ‘1’

while POR is ‘0’, it can be reliably assumed that a BOR

event has occurred.

7.5.3

DISABLING BOR IN SLEEP MODE

When BOREN<1:0> = 10, BOR remains under

hardware

control

and

operates

previously

described. However, whenever the device enters Sleep

mode, BOR is automatically disabled. When the device

returns to any other operating mode, BOR is

automatically re-enabled.

This mode allows for applications to recover from

brown-out situations, while actively executing code

when the device requires BOR protection the most. At

the same time, it saves additional power in Sleep mode

by eliminating the small incremental BOR current.

Note:

Even when the device exits from Deep

Sleep mode, both the POR and BOR bits

are set.

Note:

BOR levels differ depending on device type;

PIC24FV32KA3XX devices are at different

levels than those of PIC24F32KA3XX

devices. See Section 29.0 “Electrical

Characteristics” for BOR voltage levels.

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