PIC24FJ128GA310 datasheet(156/406 Pages) MICROCHIP

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PIC24FJ128GA310 FAMILY

DS39996F-page 156

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TABLE 10-2:

EXITING POWER SAVING MODES

10.1.1

INSTRUCTION-BASED

POWER-SAVING MODES

Three of the power-saving modes are entered through

the execution of the PWRSAV instruction. Sleep mode

stops clock operation and halts all code execution. Idle

mode halts the CPU and code execution, but allows

peripheral modules to continue operation. Deep Sleep

mode stops clock operation, code execution and all

peripherals, except RTCC and DSWDT. It also freezes

I/O states and removes power to Flash memory and

may remove power to SRAM.

The assembly syntax of the PWRSAV instruction is shown

in Example 10-1. Sleep and Idle modes are entered

directly with a single assembler command. Deep Sleep

requires an additional sequence to unlock and enable

the entry into Deep Sleep, which is described in

Section 10.4.1 “Entering Deep Sleep Mode”

Sleep and Idle modes can be exited as a result of an

enabled interrupt, WDT time-out or a device Reset.

When the device exits these modes, it is said to

“wake-up”.

The features enabled with the low-voltage/retention

regulator results in some changes to the way that Sleep

mode behaves. See Section 10.3 “Sleep Mode”.

10.1.1.1

Interrupts Coincident with Power

Save Instructions

Any interrupt that coincides with the execution of a

PWRSAV

instruction will be held off until entry into

Sleep/Deep Sleep or Idle mode has completed. The

device will then wake-up from Sleep/Deep Sleep or Idle

mode.

EXAMPLE 10-1:

PWRSAV

INSTRUCTION SYNTAX

Mode

Exit Conditions

Code

Execution

Resumes(2)

Interrupts

Resets

RTCC

Alarm

WDT

VDD

Restore

All

INT0

All

POR

MCLR

Idle

N/A

Next instruction

Sleep (all modes)

N/A

Deep Sleep

Y(1)

N/A

Reset vector

VBAT

Reset vector

Note 1:

Deep Sleep WDT.

Code execution resumption is also valid for all the exit conditions; for example, a MCLR and POR exit will

cause code execution from the Reset vector.

Note:

SLEEP_MODE

and

IDLE_MODE

are

constants defined in the assembler

include file for the selected device.

To enter Deep Sleep, the DSCON<0> bit

should be cleared before setting the

DSEN bit,

// Syntax to enter Sleep mode:

PWRSAV

#SLEEP_MODE

; Put the device into SLEEP mode

//Synatx to enter Idle mode:

PWRSAV

#IDLE_MODE

; Put the device into IDLE mode

// Syntax to enter Deep Sleep mode:

// First use the unlock sequence to set the DSEN bit (see Example 10-2)

CLR

DSCON

CLR

DSCON

; (repeat the command)

BSET

DSCON,

#DSEN

; Enable Deep Sleep

BSET

DSCON,

#DSEN

; Enable Deep Sleep (repeat the command)

PWRSAV

#SLEEP_MODE

; Put the device into Deep SLEEP mode

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