PIC24F08KL402 datasheet(105/260 Pages) MICROCHIP

105 / 260 page

 2011 Microchip Technology Inc.

DS31037B-page 105

PIC24F16KL402 FAMILY

10.0

POWER-SAVING FEATURES

The PIC24F16KL402 family of devices provides 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 circuits being clocked constitutes lower

consumed power. All PIC24F devices manage power

consumption using several strategies:

• Clock frequency

• Instruction-based Idle and Sleep modes

• Hardware-based periodic wake-up from Sleep

• 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

PIC24F devices allow for 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 NOSC bits. 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

PIC24F devices have two special power-saving modes

that are entered through the execution of a special

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.

The assembly 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:

This data sheet summarizes the features

of this group of PIC24F devices. It is not

intended

comprehensive

reference source. For more information

on Power-Saving Features, refer to the

“PIC24F

Family

Reference

Manual”

“Section 39. Power-Saving Features

with Deep Sleep”

(DS39727).

Note:

SLEEP_MODE

and

IDLE_MODE

are

constants, 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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