ATmega128
Standby Mode
Extended Standby
Mode
W hen 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.
W hen 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.
Table 18. Active Clock Domains and W ake Up Sources in the Different Sleep Modes
Active Clock Domains
Oscillators
Wake Up Sources
Main Clock
Timer
T W I
SPM/
Sleep
Source
Osc
Address
EEPROM
Other
Mode
clk CPU clk FLASH clk IO clk ADC clk ASY
Enabled
Enabled
INT7:0
Match
Timer 0
Ready
ADC
I/O
Idle
X
X
X
X
X (2)
X
X
X
X
X
X
ADC
Noise
X
X
X
X (2)
X (3)
X
X
X
X
Reduction
Power-
down
X (3)
X
Power-
save
Standby (1)
Extended
Standby (1)
X (2)
X (2)
X (2)
X
X X (2)
X (3)
X (3)
X (3)
X
X
X
X (2)
X (2)
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
46
2467X–AVR–06/11
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