MCP19116 datasheet(99/246 Pages) MICROCHIP

99 / 246 page

 2015-2016 Microchip Technology Inc.

DS20005479B-page 99

MCP19116/7

14.3

Brown-out Reset (BOR)

The BOREN bit <8> in the CONFIG register enables or

disables the BOR mode, as defined in the CONFIG

VBOR for greater than 100 µs minimum. On any Reset

(Power-on, Brown-out, Watchdog Timer, etc.), the chip

will remain in Reset until VDD rises above VBOR (refer

to Figure 14-3). If enabled, the Power-Up Timer will be

invoked by the Reset and will keep the chip in Reset for

additional

64 ms.

During

power-up,

recommended that the BOR configuration bit is

enabled holding the MCU in Reset (OSC turned off and

no code execution) until VDD exceeds the VBOR

threshold. Users have the option of adding an

additional 64 ms delay by clearing the PWRTE bit. At

this time, the VDD voltage level is high enough to

operate the MCU functions only; all other device

functionality is not operational. This is independent of

the value of VIN, which is typically VDD +VDROPOUT.

During power-down with BOR enabled, the MCU

operation will be held in Reset when VDD falls below the

VBOR threshold. With BOR disabled or while operating

in Sleep mode, the POR will hold the part in Reset

when VDD falls below the VPOR threshold.

FIGURE 14-3:

BROWN-OUT SITUATIONS

Note:

The Power-Up Timer is enabled by the

PWRTE bit in the CONFIG register. 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 the VDD

rises above VBOR, the Power-Up Timer

will execute a 64 ms reset.

VDD

Internal

VDD

Internal

VBOR

64 ms (1)

<64ms

Note 1: 64 ms delay only if PWRTE bit is programmed to ‘0’.

Reset

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