Datasheet

34
2466T–AVR–07/10
ATmega16(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 six 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 AS2 bit in ASSR is set.
3. Only INT2 or level interrupt INT1 and INT0.
Table 14. 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
IO
clk
ADC
clk
ASY
Main Clock
Source Enabled
Timer Osc.
Enabled
INT2
INT1
INT0
TWI
Address
Match
Timer
2
SPM /
EEPROM
Ready ADC
Other
I/O
Idle X X X X X
(2)
XXXXXX
ADC
Noise
Redu-
ction
XX X X
(2)
X
(3)
XXXX
Power
Down
X
(3)
X
Power
Save
X
(2)
X
(2)
X
(3)
XX
(2)
Standby
(1)
XX
(3)
X
Exten-
ded
Standby
(1)
X
(2)
XX
(2)
X
(3)
XX
(2)