AT90USB646 datasheet(53/459 Pages) ATMEL

53 / 459 page

7593H–AVR–11/08

ATmega32U6/AT90USB64/128

If Timer/Counter2 is enabled, it will keep running during sleep. The device can wake up from

either Timer Overflow or Output Compare event from Timer/Counter2 if the corresponding

Timer/Counter2 interrupt enable bits are set in TIMSK2, and the Global Interrupt Enable bit in

SREG is set.

If Timer/Counter2 is not running, Power-down mode is recommended instead of Power-save

mode.

The Timer/Counter2 can be clocked both synchronously and asynchronously in Power-save

mode. If the Timer/Counter2 is not using the asynchronous clock, the Timer/Counter Oscillator is

stopped during sleep. If the Timer/Counter2 is not using the synchronous clock, the clock source

is stopped during sleep. Note that even if the synchronous clock is running in Power-save, this

clock is only available for the Timer/Counter2.

7.5

Standby Mode

When the SM2..0 bits are 110 and an external crystal/resonator clock option is selected, the

SLEEP instruction makes the MCU enter Standby mode. This mode is identical to Power-down

with the exception that the Oscillator is kept running. From Standby mode, the device wakes up

in six clock cycles. Note that in Stanby mode the PLL is disabled and the USB interface will not

function.

7.6

Extended Standby Mode

When the SM2..0 bits are 111 and an external crystal/resonator clock option is selected, the

SLEEP instruction makes the MCU enter Extended Standby mode. This mode is identical to

Power-save mode with the exception that the Oscillator is kept running. From Extended Standby

mode, the device wakes up in six clock cycles.

Notes:

1. Only recommended with external crystal or resonator selected as clock source.

2. If Timer/Counter2 is running in asynchronous mode.

3. For INT7:4, only level interrupt.

4. Asynchronous USB interrupts are VBUSTI, WAKEUPI, IDTI and HWUPI.

Table 7-2.

Active Clock Domains and Wake-up Sources in the Different Sleep Modes.

Active Clock Domains

Oscillators

Wake-up Sources

Sleep Mode

Idle

(2)

XXXXX

XXXX

ADCNRM

(2)

(3)

(2)

Power-down

(3)

Power-save

(2)

(3)

Standby

(1)

(3)

Extended

Standby

(2)

(3)

AT90USB646 Datasheet(PDF) 53 Page - ATMEL Corporation

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