ATtiny261A datasheet(38/292 Pages) ATMEL

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8197A–AVR–10/09

ATtiny261A/461A/861A

These bits select between the three available sleep modes as shown in Table 7-2.

• Bit 2 – BODSE: BOD Sleep Enable

The BODSE bit enables setting of BODS control bit, as explained on BODS bit description. BOD

disable is controlled by a timed sequence.

7.5.2

PRR – Power Reduction Register

The Power Reduction Register provides a method to reduce power consumption by allowing

peripheral clock signals to be disabled.

• Bits 7, 6, 5, 4 – Res: Reserved Bits

These bits are reserved and will always read zero.

• Bit 3 – PRTIM1: Power Reduction Timer/Counter1

Writing a logic one to this bit shuts down the Timer/Counter1 module. When the Timer/Counter1

is enabled, operation will continue like before the shutdown.

• Bit 2 – PRTIM0: Power Reduction Timer/Counter0

Writing a logic one to this bit shuts down the Timer/Counter0 module. When the Timer/Counter0

is enabled, operation will continue like before the shutdown.

• Bit 1 – PRUSI: Power Reduction USI

Writing a logic one to this bit shuts down the USI by stopping the clock to the module. When

waking up the USI again, the USI should be re initialized to ensure proper operation.

• Bit 0 – PRADC: Power Reduction ADC

Writing a logic one to this bit shuts down the ADC. The ADC must be disabled before shut down.

Also analog comparator needs this clock.

Table 7-2.

Sleep Mode Select

SM1

SM0

Sleep Mode

Idle

ADC Noise Reduction

Power-down

Standby

Bit

543

0x36 (0x56)

–

PRTIM1

PRTIM0

PRUSI

PRADC

PRR

Read/Write

RRR/W

R/W

Initial Value

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