11.3.2.1 Sleep Modes

In addition to Active mode, there are three different sleep modes with decreasing power consumption and functionality.

Idle: The CPU stops executing code. No peripherals are disabled, and all interrupt sources can wake the device.
Standby: The user can configure peripherals to be enabled or not, using the respective RUNSTBY bit. This means that the power consumption is highly dependent on what functionality is enabled, and thus may vary between the Idle and Power-Down levels.; SleepWalking is available for the ADC module.
Power-Down: BOD, WDT, and PIT (a component of the RTC) are active.; The only wake-up sources are the pin change interrupt, PIT, VLM, TWI address match, and CCL.

Table 11-1. Sleep Mode Activity Overview
Group	Peripheral		Active in Sleep Mode
Group		Clock	Idle	Standby	Power-Down
Active Clock Domain	CPU	CLK_CPU
	RTC	CLK_RTC	X	X⁽¹⁾	X⁽²⁾
	ADCn/PTC	CLK_PER	X	X⁽¹⁾
	TCBn	CLK_PER	X	X⁽¹⁾
	BOD	CLK_BOR	X	X	X
	WDT	CLK_WDT	X	X	X
	All other peripherals	CLK_PER	X
Oscillators	Main clock source		X	X⁽¹⁾
	RTC clock source		X	X⁽¹⁾	X⁽²⁾
	WDT oscillator		X	X	X
Wake-Up Sources	PORT Pin interrupt		X	X	X
	TWI Address Match interrupt		X	X	X
	USART Start-of-Frame interrupts		X	X⁽¹⁾
	ADC/PTC interrupts		X	X⁽¹⁾
	RTC interrupts		X	X⁽¹⁾	X⁽²⁾
	TCBn Capture interrupt		X	X⁽¹⁾
	All other interrupts		X

Note:

The RUNSTBY bit of the corresponding peripheral must be set to enter the Active state.
Only the PIT is available in the Power-Down sleep mode.

ATtiny1614/1616/1617