ATmega128(L)
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 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.
Mode
Table 18. Active Clock Domains and Wake Up Sources in the Different Sleep Modes
Active Clock Domains
Oscillators
Wake Up Sources
SPM/
MainClock
Source
clkCPU clkFLASH clkIO clkADC clkASY Enabled
Timer
Osc
Enabled INT7:0
TWI
Address
Match
Sleep
Mode
EEPROM
Ready
Other
ADC I/O
Timer 0
X
Idle
X
X
X
X
X(2)
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
X(2)
X(2)
X(3)
X(3)
X(3)
X
X
X
X(2)
Standby(1)
X
X
Extended
Standby(1)
X(2)
X(2)
X(2)
Notes: 1. External Crystal or resonator selected as clock source
2. If AS0 bit in ASSR is set
3. Only INT3:0 or level interrupt INT7:4
47
2467P–AVR–08/07
ATMEL [ ATMEL ]
