PIC16F1507-ESLASHSS. datasheet(72/278 Pages) MICROCHIP

72 / 278 page

PIC16(L)F1507

DS40001586D-page 72

 2011-2015 Microchip Technology Inc.

8.0

POWER-DOWN MODE (SLEEP)

The Power-down mode is entered by executing a

SLEEP

instruction.

Upon entering Sleep mode, the following conditions exist:

WDT will be cleared but keeps running, if

enabled for operation during Sleep.

PD bit of the STATUS register is cleared.

TO bit of the STATUS register is set.

CPU clock is disabled.

31 kHz LFINTOSC is unaffected and peripherals

that operate from it may continue operation in

Sleep.

Timer1 and peripherals that operate from

Timer1 continue operation in Sleep when the

Timer1 clock source selected is:

•LFINTOSC

•T1CKI

ADC is unaffected, if the dedicated FRC oscillator

is selected.

I/O ports maintain the status they had before

SLEEP

was executed (driving high, low or high-

impedance).

Resets other than WDT are not affected by

Sleep mode.

Refer to individual chapters for more details on

peripheral operation during Sleep.

To minimize current consumption, the following

conditions should be considered:

• I/O pins should not be floating

• External circuitry sinking current from I/O pins

• Internal circuitry sourcing current from I/O pins

• Current draw from pins with internal weak pull-ups

• Modules using 31 kHz LFINTOSC

• CWG, NCO and CLC modules using HFINTOSC

I/O pins that are high-impedance inputs should be

pulled to VDD or VSS externally to avoid switching

currents caused by floating inputs.

Examples of internal circuitry that might be sourcing

current include the FVR module. See Section

13.0 “Fixed Voltage Reference (FVR)”

for more

information on this module.

8.1

Wake-up from Sleep

The device can wake-up from Sleep through one of the

following events:

External Reset input on MCLR pin, if enabled

BOR Reset, if enabled

POR Reset

Watchdog Timer, if enabled

Any external interrupt

Interrupts by peripherals capable of running

during Sleep (see individual peripheral for more

information)

The first three events will cause a device Reset. The

last three events are considered a continuation of pro-

gram execution. To determine whether a device Reset

or wake-up event occurred, refer to Section

6.12 “Determining the Cause of a Reset”

When the SLEEP instruction is being executed, the next

instruction (PC + 1) is prefetched. For the device to

wake-up through an interrupt event, the corresponding

interrupt enable bit must be enabled. Wake-up will

occur regardless of the state of the GIE bit. If the GIE

bit is disabled, the device continues execution at the

instruction after the SLEEP instruction. If the GIE bit is

enabled, the device executes the instruction after the

SLEEP

instruction, the device will then call the Interrupt

Service Routine. In cases where the execution of the

instruction following SLEEP is not desirable, the user

should have a NOP after the SLEEP instruction.

The WDT is cleared when the device wakes up from

Sleep, regardless of the source of wake-up.

8.1.1

WAKE-UP USING INTERRUPTS

When global interrupts are disabled (GIE cleared) and

any interrupt source has both its interrupt enable bit

and interrupt flag bit set, one of the following will occur:

• If the interrupt occurs before the execution of a

SLEEP

instruction

- SLEEP instruction will execute as a NOP.

- WDT and WDT prescaler will not be cleared

-TO bit of the STATUS register will not be set

-PD bit of the STATUS register will not be

cleared.

• If the interrupt occurs during or after the execu-

tion of a SLEEP instruction

- SLEEP instruction will be completely

executed

- Device will immediately wake-up from Sleep

- WDT and WDT prescaler will be cleared

-TO bit of the STATUS register will be set

-PD bit of the STATUS register will be cleared

Even if the flag bits were checked before executing a

SLEEP

instruction, it may be possible for flag bits to

become set before the SLEEP instruction completes. To

determine whether a SLEEP instruction executed, test

the PD bit. If the PD bit is set, the SLEEP instruction

was executed as a NOP.

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