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ATMEGA16-16MC Datasheet(PDF) 32 Page - ATMEL Corporation

Part No. ATMEGA16-16MC
Description  8-bit AVR Microcontroller with 16K Bytes In-System Programmable Flash
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Maker  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
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ATMEGA16-16MC Datasheet(HTML) 32 Page - ATMEL Corporation

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32
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
2
SPM /
EEPROM
Ready
ADC
Other
I/O
Idle
X
X
X
X
X
(2)
XX
X
X
X
X
ADC
Noise
Redu-
ction
XX
X
X
(2)
X
(3)
XX
X
X
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)


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