AT90SCR100 datasheet(44/433 Pages) ATMEL

44 / 433 page

TPR0327AY–SMS–30Jan09

AT90SCR100

Note that if a level triggered interrupt is used to wake-up from Power-down mode, the changed

level must be held for some time to wake up the MCU. Refer to “External Interrupts” on page 69

for details.

When waking up from Power-down mode, there is a delay from when the wake-up condition

occurs until when the wake-up becomes effective. This allows the clock to restart and become

stable after having been stopped. The wake-up period is defined in Table 7-3.

8.1.3

Power-save Mode

When the SM2:0 bits are written to 011, the SLEEP instruction makes the MCU enter Power-

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

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.

8.1.4

Standby Mode

When the SM2:0 bits are 110, 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.

8.1.5

Extended Standby Mode

When the SM2:0 bits are 111, 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. If Timer/Counter2 is running in asynchronous mode.

2. For INT3:0, only level interrupt.

Table 8-1.

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

Active Clock Domains

Oscillators

Wake-up Sources

Sleep Mode

Idle

XXXX

X(1)

XXXXXXX

Power-down

X(2)

Power-save

X(1)

X(2)

Standby

X(2)

Extended

Standby

X(1)

XX(1)

X(2)

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