ATmega128 datasheet(47/386 Pages) ATMEL

47 / 386 page

2467S–AVR–07/09

ATmega128

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 6 clock cycles.

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. External Crystal or resonator selected as clock source

2. If AS

0 bit in ASSR is set

3. Only INT3:0 or level interrupt INT7:4

Table 18. Active Clock Domains and Wake Up Sources in the Different Sleep Modes

Active Clock Domains

Oscillators

Wake Up Sources

Sleep

Mode

clk

CPU

clk

FLASH

clk

ADC

clk

ASY

Main Clock

Source

Enabled

Timer

Osc

Enabled

INT7:0

TWI

Address

Match

Timer

SPM/

EEPROM

Ready

ADC

Other

I/O

Idle

X(2)

ADC

Noise

Reduction

X(2)

X(3)

Power-

down

X(3)

Power-

save

X(2)

X(3)

XX(2)

Standby(1)

XX(3)

Extended

Standby(1)

X(2)

XX(2)

X(3)

XX(2)

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