PIC16F570 datasheet(49/134 Pages) MICROCHIP

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 2012-2014 Microchip Technology Inc.

DS40001652C-page 49

PIC16F527

8.10

Power-down Mode (Sleep)

A device may be powered down (Sleep) and later

powered up (wake-up from Sleep).

8.10.1

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 of the STATUS register is set,

the PD bit of the STATUS register is cleared and the

oscillator driver is turned off. The I/O ports maintain the

status they had before the SLEEP instruction was exe-

cuted (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

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

enabled.

8.10.2

WAKE-UP FROM SLEEP

The device can wake-up from Sleep through one of

the following events:

An external Reset input on RB3/MCLR/VPP pin,

when configured as MCLR.

A Watchdog Timer Time-out Reset (if WDT was

enabled).

From an interrupt source, see Section 8.11

“Interrupts” for more information.

On waking from Sleep, the processor will continue to

execute the instruction immediately following the

SLEEP instruction. If the WUR bit is also set, upon

waking from Sleep, the device will reset. If the GIE bit

is also set, upon waking from Sleep, the processor will

branch

the

interrupt

vector.

Please

see

Section 8.11 “Interrupts” for more information.

The TO and PD bits can be used to determine the

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

WDT time-out occurred and subsequently caused a

wake-up. The PD bit, which is set on power-up, is

cleared when SLEEP is invoked.

The WDT is cleared when the device wakes from

Sleep, regardless of the wake-up source.

Note:

A Reset generated by a WDT time-out

does not drive the MCLR pin low.

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:

Caution: Right before entering Sleep,

read

the

comparator

Configuration

When in Sleep, wake-up occurs when the

comparator output bit C1OUT and

C2OUT change from the state they were

in at the last reading. If a wake-up on com-

parator 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.

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