Microchip Technology AC164112 Data Sheet

© 2009 Microchip Technology Inc.

DS41341E-page 37

Brown-out Reset is enabled by programming the
BOREN<1:0> bits in the Configuration register. The
brown-out trip point is selectable from two trip points
via the BORV bit in the Configuration register.

Between the POR and BOR, complete voltage range
coverage for execution protection can be imple-
mented.

Two bits are used to enable the BOR. When
BOREN = 11, the BOR is always enabled. When
BOREN = 10, the BOR is enabled, but disabled during
Sleep. When BOREN = 0X, the BOR is disabled.

If V

DD

 falls below V

BOR

 for greater than parameter

(T

BOR

) (see Section 23.0 “Electrical Specifica-

tions”), the Brown-out situation will reset the device.
This will occur regardless of V

DD

 slew rate. A Reset is

not ensured to occur if V

DD

 falls below V

BOR

 for more

than parameter (T

BOR

). 

If V

DD

 drops below V

BOR

 while the Power-up Timer is

running, the chip will go back into a Brown-out Reset
and the Power-up Timer will be re-initialized. Once V

DD

rises above V

BOR

, the Power-up Timer will execute a

64 ms Reset.

When erasing Flash program memory, the
BOR is forced to enabled at the minimum
BOR setting to guarantee that any code
protection circuitry is operating properly.

64 ms

V

BOR

 

V

DD

Internal

Reset

V

BOR

 

V

DD

Internal

Reset

64 ms

< 64 ms

64 ms

V

BOR

 

V

DD

Internal

Reset

64 ms delay only if PWRTE bit is programmed to ‘0’.