XMEGAD datasheet(75/309 Pages) ATMEL

75 / 309 page

8210B–AVR–04/10

XMEGA D

Table 7-1 on page 75 shows the different sleep modes and the active clock domains, oscillators

and wake-up sources.

The wake-up time for the device is dependent on the sleep mode and the main clock source.

The start-up time for the system clock source must be added to the wake-up time for sleep

modes where the clock source is stopped. For details on the start-up time for the different oscil-

lators options refer to ”System Clock and Clock options” on page 55.

The content of the Register File, SRAM and registers are kept during sleep. If a reset occurs

during sleep, the device will reset, start up and execute from the Reset Vector.

7.3.1

Idle Mode

In Idle mode the CPU and Non-Volatile Memory are stopped, (note that any active programming

will be completed) but all peripherals including the Interrupt Controller and Event System are

kept running. Any interrupt request interrupts will wake the device.

7.3.2

Power-down Mode

In Power-down mode all system clock sources, including the Real Time Counter clock source

are stopped. This allows operation of asynchronous modules only. The only interrupts that can

wake up the MCU are the Two Wire Interface address match interrupts, and asynchronous port

interrupts.

7.3.3

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.

Table 7-1.

Active clock domains and wake-up sources in the different sleep modes.

Active clock domain

Oscillators

Wake-up sources

Sleep modes

Idle

Power-down

Power-save

Standby

Extended Standby

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