ATXMEGA128D4 datasheet(20/100 Pages) ATMEL

20 / 100 page

8135G–AVR–08/10

XMEGA D4

10. Power Management and Sleep Modes

10.1

Features

• 5 sleep modes

–Idle

– Power-down

–Power-save

–Standby

– Extended standby

• Power Reduction registers to disable clocks to unused peripherals

10.2

Overview

XMEGA provides various sleep modes and software controlled clock gating in order to tailor

power consumption to the application's requirement. Sleep modes enables the microcontroller to

shut down unused modules to save power. When the device enters sleep mode, program exe-

cution is stopped and interrupts or reset is used to wake the device again. The individual clock to

unused peripherals can be stopped during normal operation or in sleep, enabling a much more

fine tuned power management than sleep modes alone

10.3

Sleep Modes

Sleep modes are used to shut down modules and clock domains in the microcontroller in order

to save power. XMEGA has five different sleep modes. A dedicated Sleep instruction (SLEEP) is

available to enter sleep. Before executing SLEEP, the selected sleep mode to enter must be

configured. The available interrupt wake-up sources is dependent on the selected sleep mode.

When an enabled interrupt occurs the device will wake up and execute the interrupt service rou-

tine before continuing normal program execution from the first instruction after the SLEEP

instruction. If other higher priority interrupts are pending when the wake-up occurs, their interrupt

service routines will be executed according to their priority before the interrupt service routine for

the wake-up interrupt is executed. After wake-up the CPU is halted for four cycles before execu-

tion starts.

10.3.1

Idle Mode

In Idle mode the CPU and Non-Volatile Memory are stopped, but all peripherals including the

Interrupt Controller and Event System are kept running. Interrupt requests from all enabled inter-

rupts will wake the device.

10.3.2

Power-down Mode

In Power-down mode all system clock sources, and the asynchronous Real Time Counter (RTC)

clock source, are stopped. This allows operation of asynchronous modules only. The only inter-

rupts that can wake up the MCU are the Two Wire Interface address match interrupts, and

asynchronous port interrupts.

10.3.3

Power-save Mode

Power-save mode is identical to Power-down, with one exception:

If the Real Time Counter (RTC) is enabled, it will keep running during sleep and the device can

also wake up from either RTC Overflow or Compare Match interrupt.

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