PIC16LC712 datasheet(64/106 Pages) MICROCHIP

64 / 106 page

PIC16C712/716

DS41106C-page 64

 1999-2013 Microchip Technology Inc.

9.13

Power-down Mode (Sleep)

Power-Down mode is entered by executing a SLEEP

instruction.

If enabled, the Watchdog Timer will be cleared but

keeps running, the PD bit (STATUS<3>) is cleared, the

TO (STATUS<4>) bit is set, and the oscillator driver is

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

before the SLEEP instruction was executed (driving

high, low, or high-impedance).

For lowest current consumption in this mode, place all

I/O pins at either VDD or VSS, ensure no external

circuitry is drawing current from the I/O pin, power-

down the A/D and the disable external clocks. Pull all I/

O pins, that are high-impedance inputs, high or low

externally to avoid switching currents caused by float-

ing inputs. The T0CKI input should also be at VDD or

VSS for lowest current consumption. The contribution

from on-chip pull-ups on PORTB should be considered.

The MCLR pin must be at a logic high level (VIHMC).

9.13.1

WAKE-UP FROM SLEEP

The device can wake up from Sleep through one of the

following events:

External Reset input on MCLR pin.

Watchdog

Timer

Wake-up

(if

WDT

was

enabled).

Interrupt from INT pin, RB port change, or some

peripheral interrupts.

External MCLR Reset will cause a device Reset. All

other events are considered a continuation of program

execution and cause a “wake-up”. The TO and PD bits

in the STATUS register can be used to determine the

cause of device Reset. The PD bit, which is set on

power-up, is cleared when SLEEP is invoked. The TO

bit is cleared if a WDT Time-out occurred (and caused

wake-up).

The following peripheral interrupts can wake the device

from Sleep:

TMR1 interrupt. Timer1 must be operating as an

asynchronous counter.

CCP Capture mode interrupt.

Special Event Trigger (Timer1 in Asynchronous

mode using an external clock).

Other peripherals cannot generate interrupts, since

during Sleep, no on-chip clocks are present.

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