ATTINY861A-SU Atmel, ATTINY861A-SU Datasheet - Page 34

• Manufacturer Part Number: ATTINY861A-SU
• Description: IC, MCU, 8BIT, 8K FLASH, 20SOIC
• Manufacturer: Atmel

Specifications of ATTINY861A-SU

• Controller Family/series: ATtiny
• No. Of I/o's: 16
• Eeprom Memory Size: 512Byte
• Ram Memory Size: 512Byte
• Cpu Speed: 20MHz
• No.: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 8KB
• Oscillator Type: External, Internal
• Rohs Compliant: Yes

7. Power Management and Sleep Modes
7.1
7.1.1
34
Sleep Modes
ATtiny261A/461A/861A
Idle Mode
The high performance and industry leading code efficiency makes the AVR microcontrollers an
ideal choise for low power applications. In addition, sleep modes enable the application to shut
down unused modules in the MCU, thereby saving power. The AVR provides various sleep
modes allowing the user to tailor the power consumption to the application’s requirements.
Figure 6-1 on page 24
helpful in selecting an appropriate sleep mode.
their wake up sources.
Table 7-1.
Note:
To enter any of the sleep modes, the SE bit in MCUCR must be written to logic one and a
SLEEP instruction must be executed. The SM1:0 bits in the MCUCR Register select which sleep
mode (Idle, ADC Noise Reduction, Power-down, or Standby) will be activated by the SLEEP
instruction. See
If an enabled interrupt occurs while the MCU is in a sleep mode, the MCU wakes up. The MCU
is then halted for four cycles in addition to the start-up time, executes the interrupt routine, and
resumes execution from the instruction following SLEEP. The contents of the Register File and
SRAM are unaltered when the device wakes up from sleep. If a reset occurs during sleep mode,
the MCU wakes up and executes from the Reset Vector.
Note that if a level triggered interrupt is used for wake-up the changed level must be held for
some time to wake up the MCU (and for the MCU to enter the interrupt service routine). See
“External Interrupts” on page 49
When bits SM1:0 are written to 00, the SLEEP instruction makes the MCU enter Idle mode,
stopping the CPU but allowing Analog Comparator, ADC, Timer/Counter, Watchdog, and the
interrupt system to continue operating. This sleep mode basically halts clk
allowing the other clocks to run.
Sleep Mode
Idle
ADC Noise Reduct.
Power-down
Standby
1. For INT0 and INT1, only level interrupt.
2. When PLL selected as system clock.
Active Clock Domains and Wake-up Sources in Different Sleep Modes
Table 7-2
presents the different clock systems and their distribution. The figure is
Active Clock Domains
for a summary.
X
for details.
X
X
X
X
X
Table 7-1
(2)
(2)
Osc.
X
X
shows the different sleep modes and
X
X
X
X
(1)
(1)
(1)
X
X
Wake-up Sources
CPU
X
X
and clk
X
X
X
X
8197B–AVR–01/10
FLASH
X
, while
X
X
X
X