DSPIC33EP64GS708 datasheet(117/484 Pages) MICROCHIP

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DS70005258C-page 117

dsPIC33EPXXXGS70X/80X FAMILY

10.0 POWER-SAVING FEATURES

The

dsPIC33EPXXXGS70X/80X

family

devices

provide the ability to manage power consumption by

selectively managing clocking to the CPU and the

peripherals. In general, a lower clock frequency and

a reduction in the number of peripherals being

clocked constitutes lower consumed power.

dsPIC33EPXXXGS70X/80X family devices can

manage power consumption in four ways:

• Clock Frequency

• Instruction-Based Sleep and Idle modes

• Software-Controlled Doze mode

• Selective Peripheral Control in Software

Combinations of these methods can be used to

selectively tailor an application’s power consumption

while still maintaining critical application features, such

as timing-sensitive communications.

10.1

Clock Frequency and Clock

Switching

The dsPIC33EPXXXGS70X/80X family devices allow a

wide range of clock frequencies to be selected under

application control. If the system clock configuration is not

locked, users can choose low-power or high-precision

oscillators by simply changing the NOSCx bits

(OSCCON<10:8>). The process of changing a system

clock during operation, as well as limitations to the

process, are discussed in more detail in Section 9.0

“Oscillator Configuration”.

10.2

Instruction-Based Power-Saving

Modes

The dsPIC33EPXXXGS70X/80X family devices have

two special power-saving modes that are entered

through the execution of a special PWRSAV instruc-

tion. 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. The assembler syntax of the PWRSAV

instruction is shown in Example 10-1.

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”.

EXAMPLE 10-1:

PWRSAV INSTRUCTION SYNTAX

Note 1: This

data

sheet

summarizes

the

features of the dsPIC33EPXXXGS70X/

80X family of devices. It is not intended

to be a comprehensive reference source.

To complement the information in this data

sheet, refer to “Watchdog Timer and

Power-Saving Modes” (DS70615) in the

“dsPIC33/PIC24 Family Reference Man-

ual”, which is available from the Microchip

website (www.microchip.com).

2: Some registers and associated bits

described in this section may not be

available on all devices. Refer to

Section 4.0 “Memory Organization” in

this data sheet for device-specific register

and bit information.

Note:

SLEEP_MODE and IDLE_MODE are con-

stants defined in the assembler include

file for the selected device.

PWRSAV #SLEEP_MODE

; Put the device into Sleep mode

PWRSAV #IDLE_MODE

; Put the device into Idle mode

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