ATmega64A datasheet(50/392 Pages) ATMEL

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8160C–AVR–07/09

ATmega64A

9.8

9.8.1

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 programmers

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 4:2 – SM2:0: Sleep Mode Select Bits 2, 1, and 0

These bits select between the six available sleep modes as shown in Table 9-2.

Note:

1. Standby mode and Extended Standby mode are only available with external crystals or

resonators.

Bit

7654

3210

0x35 (0x55)

SRE

SRW10

SM1

SM0

SM2

IVSEL

IVCE

MCUCR

Read/Write

R/W

Initial Value

0000

Table 9-2.

Sleep Mode Select

SM2

SM1

SM0

Sleep Mode

000

Idle

ADC Noise Reduction

010

Power-down

011

Power-save

100

Reserved

101

Reserved

110

Standby(1)

Extended Standby(1)

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