PIC16LF720_11 Datasheet, PDF (31/244 Pages) Microchip Technology – 20-Pin Flash Microcontrollers with nanoWatt XLP Technology

PIC16(L)F720/721
3.5 Brown-Out Reset (BOR)
Brown-out Reset is enabled by programming the
BOREN<1:0> bits in the Configuration register.
Between the POR and BOR, complete voltage range
coverage for execution protection can be
implemented.
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 VDD falls below VBOR for greater than parameter
(TBOR) (see Section 23.0 “Electrical Specifica-
tions”), the Brown-out situation will reset the device.
This will occur regardless of VDD slew rate. A Reset is
not ensured to occur if VDD falls below VBOR for more
than parameter (TBOR).
If VDD drops below VBOR 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 VDD
rises above VBOR, the Power-up Timer will execute a
64 ms Reset.
FIGURE 3-3:
BROWN-OUT SITUATIONS
VDD
Internal
Reset
VDD
64 ms⁽¹⁾
Internal
Reset
< 64 ms
64 ms⁽¹⁾
VDD
Internal
Reset
64 ms⁽¹⁾
Note 1: 64 ms delay only if PWRTE bit is programmed to ‘0’.
VBOR
VBOR
VBOR
 2011 Microchip Technology Inc.
Preliminary
DS41430B-page 31