Atmel ATmega128 User Manual

47
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
IO
clk
ADC
clk
ASY
Main Clock
Source
Enabled
Timer
Osc
Enabled INT7:0
TWI
Address
Match Timer 0
SPM/
EEPROM
Ready ADC
Other
I/O
Idle X X X X X
(2)
XX X XXX
ADC
Noise
Reduction
XX X X
(2)
X
(3)
XX XX
Power-
down
X
(3)
X
Power-
save
X
(2)
X
(2)
X
(3)
XX
(2)
Standby
(1)
XX
(3)
X
Extended
Standby
(1)
X
(2)
XX
(2)
X
(3)
XX
(2)

Atmel ATmega128 Specifications

General

Brand	Atmel
Model	ATmega128
Category	Microcontrollers
Language	English