PIC16F15213 datasheet(62/408 Pages) MICROCHIP

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10.2

Brown-out Reset (BOR)

The BOR circuit holds the device in Reset when VDD reaches a selectable minimum level. Between the POR and

BOR, complete voltage range coverage for execution protection can be implemented.

The Brown-out Reset module has four operating modes controlled by the BOREN bits. The four operating modes are:

• BOR is always ON

• BOR is OFF when in Sleep

• BOR is controlled by software

• BOR is always OFF

Refer to Table 10-1 for more information.

The Brown-out Reset voltage level is selectable by configuring the BORV bits.

A VDD noise rejection filter prevents the BOR from triggering on small events. If VDD falls below VBOR for a duration

greater than parameter TBORDC, the device will reset and the BOR bit will be cleared, indicating the Brown-out Reset

condition occurred. See Figure 10-2.

10.2.1

BOR is Always ON

When the BOREN bits are programmed to ‘11’, the BOR is always ON. The device start-up will be delayed until the

BOR is ready and VDD is higher than the BOR threshold.

BOR protection is active during Sleep. The BOR does not delay wake-up from Sleep.

10.2.2

BOR is OFF in Sleep

When the BOREN bits are programmed to ‘10’, the BOR is on, except in Sleep. BOR protection is not active during

Sleep, but device wake-up will be delayed until the BOR can determine that VDD is higher than the BOR threshold.

The device wake-up will be delayed until the BOR is ready.

10.2.3

BOR Controlled by Software

When the BOREN bits of Configuration Words are programmed to ‘01’, the BOR is controlled by the SBOREN bit.

The device start-up is not delayed by the BOR ready condition or the VDD level.

BOR protection begins as soon as the BOR circuit is ready. The status of the BOR circuit is reflected in the BORRDY

bit.

BOR protection is unchanged by Sleep.

Table 10-1. BOR Operating Modes

BOREN

SBOREN

Device Mode

BOR Mode

Instruction Execution upon:

Release of POR

Wake-up from

Sleep

11(1)

Active

Wait for release of BOR

(BORRDY = 1)

Begins

immediately

Awake

Active

Wait for release of BOR

(BORRDY = 1)

N/A

Sleep

Hibernate

N/A

Wait for release

of BOR

(BORRDY = 1)

Active

Wait for release of BOR

(BORRDY = 1)

Begins

immediately

Hibernate

Disabled

Begins immediately

PIC16F15225/45

Resets

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