MCP19124 datasheet(85/236 Pages) MICROCHIP

85 / 236 page

 2016 Microchip Technology Inc.

DS20005619A-page 85

MCP19124/5

12.3

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 12-3). If enabled, the Power-Up Timer

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

Reset an additional 64 ms. During power-up, it is

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 12-3:

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

Reset

VDD

Internal

Reset

Internal

Reset

VBOR

64 ms(1)

64 ms (1)

<64ms

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

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