10F200 datasheet(51/96 Pages) MICROCHIP

51 / 96 page

DS41239D-page 49

PIC10F200/202/204/206

FIGURE 9-9:

BROWN-OUT

PROTECTION CIRCUIT 3

9.9

Power-Down Mode (Sleep)

A device may be powered down (Sleep) and later

powered up (wake-up from Sleep).

9.9.1

SLEEP

The Power-Down mode is entered by executing a

SLEEP instruction.

If enabled, the Watchdog Timer will be cleared but

keeps running, the TO bit (STATUS<4>) is set, the PD

bit (STATUS<3>) is cleared and the oscillator driver is

turned off. The I/O ports maintain the status they had

before the SLEEP instruction was executed (driving

high, driving low or high-impedance).

For lowest current consumption while powered down,

the T0CKI input should be at VDD or VSS and the GP3/

MCLR/VPP pin must be at a logic high level if MCLR is

enabled.

9.9.2

WAKE-UP FROM SLEEP

The device can wake-up from Sleep through one of

the following events:

An external Reset input on GP3/MCLR/VPP pin,

when configured as MCLR.

A Watchdog Timer time-out Reset (if WDT was

enabled).

A change on input pin GP0, GP1 or GP3 when

wake-up on change is enabled.

A comparator output change has occurred when

wake-up on comparator change is enabled.

These events cause a device Reset. The TO, PD

GPWUF and CWUF bits can be used to determine the

cause of device Reset. The TO bit is cleared if a WDT

time-out occurred (and caused wake-up). The PD bit,

which is set on power-up, is cleared when SLEEP is

invoked. The GPWUF bit indicates a change in state

while in Sleep at pins GP0, GP1 or GP3 (since the last

file or bit operation on GP port). The CWUF bit

indicates a change in the state while in Sleep of the

comparator output.

Note:

A Reset generated by a WDT time-out

does not drive the MCLR pin low.

Note:

This brown-out protection circuit employs

Microchip Technology’s MCP809 micro-

controller supervisor. There are 7 different

trip point selections to accommodate 5V to

3V systems.

MCLR

PIC10F20X

VDD

VSS

RST

MCP809

VDD

Bypass

Capacitor

Note:

Caution: Right before entering Sleep,

read the input pins. When in Sleep, wake-

up occurs when the values at the pins

change from the state they were in at the

last reading. If a wake-up on change

occurs and the pins are not read before re-

entering Sleep, a wake-up will occur

immediately even if no pins change while

in Sleep mode.

Note:

The WDT is cleared when the device

wakes from Sleep, regardless of the wake-

up source.

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