DOC7707 datasheet(42/307 Pages) ETC1

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7707F–AVR–11/10

AT90USB82/162

purpose, it is recommended to write the Sleep Enable (SE) bit to one just before the execution of

the SLEEP instruction and to clear it immediately after waking up.

8.1

Idle Mode

When the SM2..0 bits are written to 000, the SLEEP instruction makes the MCU enter Idle

mode, stopping the CPU but allowing the USB, SPI, USART, Analog Comparator, Timer/Coun-

ters, Watchdog, and the interrupt system to continue operating. This sleep mode basically halts

clk

CPU and clkFLASH, while allowing the other clocks to run.

Idle mode enables the MCU to wake up from external triggered interrupts as well as internal

ones like the Timer Overflow, USART Transmit Complete or some USB interrupts (like SOFI,

WAKEUPI...). If wake-up from the Analog Comparator interrupt is not required, the Analog Com-

parator can be powered down by setting the ACD bit in the Analog Comparator Control and

Status Register – ACSR. This will reduce power consumption in Idle mode.

8.2

Power-down Mode

When the SM2..0 bits are written to 010, the SLEEP instruction makes the MCU enter Power-

down mode. In this mode, the external Oscillator is stopped, while the external interrupts, the 2-

wire Serial Interface, and the Watchdog continue operating (if enabled). Only an External Reset,

a Watchdog Reset, a Brown-out Reset, 2-wire Serial Interface address match, an external level

interrupt on INT7:4, an external interrupt on INT3:0, a pin change interrupt or an asynchronous

USB interrupt source (WAKEUPI only), can wake up the MCU. This sleep mode basically halts

all generated clocks, allowing operation of asynchronous modules only.

Note that if a level triggered interrupt is used for 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 84

for details.

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

until the wake-up becomes effective. This allows the clock to restart and become stable after

having been stopped. The wake-up period is defined by the same CKSEL Fuses that define the

Reset Time-out period, as described in “Clock Sources” on page 29.

8.3

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. This mode has been conserved for compati-

bility purpose with higher-end products.

8.4

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.

8.5

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. So Extended Standby

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