Datasheet

PIC24F16KL402 FAMILY
DS30001037C-page 64  2011-2013 Microchip Technology Inc.
7.4.2 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.
7.4.3 DISABLING BOR IN SLEEP MODE
When BOREN<1:0> = 10, BOR remains under
hardware control and operates as 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 are set.