ATtiny261-ESSZ datasheet(38/227 Pages) ATMEL

38 / 227 page

7753C–AVR–07/09

ATtiny261/ATtiny461/ATtiny861

For analog input pins, the digital input buffer should be disabled at all times. An analog signal

level close to V

CC/2 on an input pin can cause significant current even in active mode. Digital

input buffers can be disabled by writing to the Digital Input Disable Registers (DIDR0, DIDR1).

Refer to “DIDR0 – Digital Input Disable Register 0” on page 163 or “DIDR1 – Digital Input Dis-

able Register 1” on page 163 for details.

8.8

8.8.1

MCUCR – MCU Control Register

The MCU Control Register contains control bits for power management.

• Bit 5 – SE: Sleep Enable

The SE bit must be written to logic one to make the MCU enter the sleep mode when the SLEEP

instruction is executed. To avoid the MCU entering the sleep mode unless it is the programmer’s

purpose, it is recommended to write the Sleep Enable (SE) bit to one just before the execution of

the SLEEP instruction and to clear it immediately after waking up.

• Bits 4, 3 – SM1:0: Sleep Mode Select Bits 2..0

These bits select between the three available sleep modes as shown in Table 8-2.

• Bit 2 – Res: Reserved Bit

This bit is a reserved ed bit in the ATtiny261/461/861 and will always read as zero.

8.8.2

PRR – Power Reduction Register

• Bits 7, 6, 5, 4- Res: Reserved Bits

These bits are reserved bits in the ATtiny261/461/861 and will always read as zero.

Bit

5432

0x35 (0x55)

–

PUD

SM1

SM0

—

ISC01

ISC00

MCUCR

Read/Write

R/W

Initial Value

0000

Table 8-2.

Sleep Mode Select

SM1

SM0

Sleep Mode

Idle

ADC Noise Reduction

Power-down

Standby

Bit

0x36 (0x56)

–

PRTIM1

PRTIM0

PRUSI

PRADC

PRR

Read/Write

R/W

Initial Value

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