ATmega16 datasheet(32/315 Pages) ATMEL

32 / 315 page

ATmega16(L)

2466E–AVR–10/02

Asynchronous Timer should be considered undefined after wake-up in Power-save

mode if AS2 is 0.

This sleep mode basically halts all clocks except clk

ASY, allowing operation only of asyn-

chronous modules, including Timer/Counter2 if clocked asynchronously.

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 AS

2 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

clkCPU clkFLASH clkIO clkADC clkASY

Main Clock

Source Enabled

Timer Osc.

Enabled

INT2

INT1

INT0

TWI

Address

Match

Timer

SPM /

EEPROM

Ready

ADC

Other

I/O

Idle

(2)

ADC

Noise

Redu-

ction

(2)

(3)

Power

Down

(3)

Power

Save

(2)

(3)

(2)

Standby

(1)

(3)

Exten-

ded

Standby

(1)

(2)

(3)

(2)

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