ATXMEGA64A1 datasheet(22/99 Pages) ATMEL

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8067I–AVR–04/09

XMEGA A1

11. Power Management and Sleep Modes

11.1

Features

• 5 sleep modes

–Idle

– Power-down

–Power-save

–Standby

– Extended standby

• Power Reduction registers to disable clocks to unused peripherals

11.2

Overview

The XMEGA A1 provides various sleep modes tailored to reduce power consumption to a mini-

mum. All sleep modes are available and can be entered from Active mode. In Active mode the

CPU is executing application code. The application code decides when and what sleep mode to

enter. Interrupts from enabled peripherals and all enabled reset sources can restore the micro-

controller from sleep to Active mode.

In addition, Power Reduction registers provide a method to stop the clock to individual peripher-

als from software. When this is done, the current state of the peripheral is frozen and there is no

power consumption from that peripheral. This reduces the power consumption in Active mode

and Idle sleep mode.

11.3

Sleep Modes

11.3.1

Idle Mode

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

Interrupt Controller, Event System and DMA Controller are kept running. Interrupt requests from

all enabled interrupts will wake the device.

11.3.2

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, e.g pin change.

11.3.3

Power-save Mode

Power-save mode is identical to Power-down, with one exception: If the RTC is enabled, it will

keep running during sleep and the device can also wake up from RTC interrupts.

11.3.4

Standby Mode

Standby mode is identical to Power-down with the exception that all enabled system clock

sources are kept running, while the CPU, Peripheral and RTC clocks are stopped. This reduces

the wake-up time when external crystals or resonators are used.

11.3.5

Extended Standby Mode

Extended Standby mode is identical to Power-save mode with the exception that all enabled

system clock sources are kept running while the CPU and Peripheral clocks are stopped. This

reduces the wake-up time when external crystals or resonators are used.

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