10F202 datasheet(42/88 Pages) MICROCHIP

42 / 88 page

PIC10F200/202/204/206

DS40001239F-page 42

 2004-2014 Microchip Technology Inc.

9.7

Time-out Sequence, Power-down

and Wake-up from Sleep Status

Bits (TO, PD, GPWUF, CWUF)

The TO, PD, GPWUF and CWUF bits in the STATUS

has been caused by a power-up condition, a MCLR,

Watchdog Timer (WDT) Reset, wake-up on comparator

change or wake-up on pin change.

9.8

Reset on Brown-out

A Brown-out Reset 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.

To reset PIC10F200/202/204/206 devices when a

Brown-out Reset occurs, external brown-out protection

circuits may be built, as shown in Figure 9-7 and

Figure 9-8.

FIGURE 9-7:

BROWN-OUT

PROTECTION CIRCUIT 1

FIGURE 9-8:

BROWN-OUT

PROTECTION CIRCUIT 2

TABLE 9-5:

TO, PD, GPWUF, CWUF STATUS AFTER RESET

CWUF

GPWUF

Reset Caused By

WDT wake-up from Sleep

WDT time-out (not from Sleep)

MCLR wake-up from Sleep

Power-up

MCLR not during Sleep

Wake-up from Sleep on pin change

Wake-up from Sleep on comparator change

Legend: u = unchanged, x = unknown, – = unimplemented bit, read as ‘0’, q = value depends on condition.

Note 1:

The TO, PD, GPWUF and CWUF bits maintain their status (u) until a Reset occurs. A low-pulse on the

MCLR input does not change the TO, PD, GPWUF or CWUF Status bits.

Note

This circuit will activate Reset when VDD goes

below Vz + 0.7V (where Vz = Zener voltage).

Pin must be confirmed as MCLR.

33k

10k

40k(1)

VDD

MCLR(2)

PIC10F20X

VDD

Note

This brown-out circuit is less expensive,

although less accurate. Transistor Q1 turns

off when VDD is below a certain level such

that:

Pin must be confirmed as MCLR.

VDD •

R1 + R2

= 0.7V

40k(1)

VDD

MCLR(2)

PIC10F20X

VDD

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