PIC16F631 datasheet(200/294 Pages) MICROCHIP

200 / 294 page

PIC16F631/677/685/687/689/690

DS41262D-page 198

14.2.4

BROWN-OUT RESET (BOR)

The BOREN0 and BOREN1 bits in the Configuration

Word register select one of four BOR modes. Two

modes have been added to allow software or hardware

control of the BOR enable. When BOREN<1:0> = 01,

the SBOREN bit (PCON<4>) enables/disables the

BOR allowing it to be controlled in software. By

selecting BOREN<1:0>, the BOR is automatically

disabled in Sleep to conserve power and enabled on

wake-up. In this mode, the SBOREN bit is disabled.

See

for

the

Configuration

Word

definition.

If VDD falls below VBOR for greater than parameter

(TBOR) (see Section 17.0 “Electrical Specifications”),

the Brown-out situation will reset the device. This will

occur regardless of VDD slew rate. A Reset is not insured

to occur if VDD falls below VBOR for less than parameter

(TBOR).

On any Reset (Power-on, Brown-out Reset, Watchdog

Timer, etc.), the chip will remain in Reset until VDD rises

above VBOR (see Figure 14-3). The Power-up Timer

will now be invoked, if enabled and will keep the chip in

Reset an additional 64 ms.

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 14-3:

BROWN-OUT SITUATIONS

Note:

The Power-up Timer is enabled by the

PWRTE bit in the Configuration Word

64 ms(1)

VBOR

VDD

Internal

Reset

VBOR

VDD

Internal

Reset

64 ms(1)

< 64 ms

64 ms(1)

VBOR

VDD

Internal

Reset

Note 1:

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

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