PIC12F639 Microchip Technology, PIC12F639 Datasheet - Page 117

• Manufacturer Part Number: PIC12F639
• Description: (PIC12F635 / PIC12F636 / PIC12F639) 8/14-PIN FLASH-BASED / 8-BIT CMOS MICROCONTROLLERS WITH NANOWATT TECHNOLOGY
• Manufacturer: Microchip Technology

12.6
The BODEN0 and BODEN1 bits in the Configuration
Word register select one of four BOD modes. Two
modes have been added to allow software or hardware
control of the BOD enable. When BODEN<1:0> = 01,
the SBODEN bit (PCON<4>) enables/disables the BOD
allowing it to be controlled in software. By selecting
BODEN<1:0>, the BOD is automatically disabled in
Sleep to conserve power and enabled on wake-up. In
this mode, the SBODEN bit is disabled. See
Register 12-1 for the Configuration Word definition.
If V
(T
the Brown-out situation will reset the device. This will
occur regardless of V
ensured to occur if V
parameter (T
FIGURE 12-3:
© 2005 Microchip Technology Inc.
BOD
DD
) (see Section 15.0 “Electrical Specifications”),
falls below V
Brown-out Detect (BOD)
BOD
).
Note 1: Nominal 64 ms delay only if PWRTE bit is programmed to ‘0’.
Internal
Internal
Internal
Reset
Reset
Reset
V
V
V
DD
BOD
DD
DD
DD
DD
BROWN-OUT DETECT SITUATIONS
falls below V
for greater than parameter
slew rate. A Reset is not
BOD
for less than
PIC12F635/PIC16F636/639
Preliminary
< 64 ms
64 ms
On any Reset (Power-on, Brown-out Detect, Watchdog
Timer, etc.), the chip will remain in Reset until V
above V
will now be invoked, if enabled and will keep the chip in
Reset an additional nominal 64 ms.
If V
running, the chip will go back into a Brown-out Detect
and the Power-up Timer will be re-initialized. Once V
rises above V
64 ms Reset.
Note:
(1)
DD
64 ms
64 ms
drops below V
BOD
(1)
(1)
The Power-up Timer is enabled by the
PWRTE bit in the Configuration Word
register.
(see Figure 12-3). The Power-up Timer
BOD
, the Power-up Timer will execute a
BOD
while the Power-up Timer is
V
V
V
BOD
BOD
BOD
DS41232B-page 115
DD
rises
DD