PIC16F570 datasheet(48/129 Pages) MICROCHIP

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PIC16F570

DS40001684E-page 48

 2013-2014 Microchip Technology Inc.

8.9

Brown-out Reset (BOR)

A brown-out is a condition where device power (VDD)

dips below its minimum value, but not to zero, and

then recovers. The device should be reset in the event

of a brown-out. The Brown-out Reset feature is

enabled by the BOREN Configuration bit.

If VDD falls below VBOR for greater than parameter

(TBOR) (see Figure 8-12), 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).

Please see Section 15.0 “Electrical Characteristics”

for the VBOR specification and other parameters shown

in Figure 8-12.

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

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

above VBOR (see Figure 8-12). If enabled, the Device

Reset Timer will now be invoked, and will keep the chip

in Reset an additional 18 ms.

If VDD drops below VBOR while the Device Reset Timer

is running, the chip will go back into a Brown-out Reset

and the Device Reset Timer will be re-initialized. Once

VDD rises above VBOR, the Device Reset Timer will

execute a 18 ms Reset.

FIGURE 8-12:

BROWN-OUT RESET TIMING AND CHARACTERISTICS

FIGURE 8-13:

BROWN-OUT SITUATIONS

Note:

The Device Reset Timer is enabled by the

DRTEN bit in the Configuration Word

VBOR

VDD

(Device in Brown-out Reset)

(Device not in Brown-out Reset)

TDRT

TBOR

Reset

(due to BOR)

VBOR + VHYST

18 ms

VBOR

VDD

Internal

Reset

VBOR

VDD

Internal

Reset

18 ms

< 18 ms

18 ms

VBOR

VDD

Internal

Reset

(DRTEN = 1)

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