ATMEGA640 datasheet(54/436 Pages) MICROCHIP

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ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]

DS40002211A

11.10 Register Description

11.10.1

SMCR – Sleep Mode Control Register

The Sleep Mode Control Register contains control bits for power management.

• Bits 3, 2, 1 – SM2:0: Sleep Mode Select Bits 2, 1, and 0

These bits select between the five available sleep modes as shown in Table 11-2.

Note:

1. Standby modes are only recommended for use with external crystals or resonators.

• Bit 1 – 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 exe-

cuted. 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.

Bit

76543

210

0x33 (0x53)

––––

SM2

SM1

SM0

SMCR

Read/Write

RRRR

R/W

Initial Value

00000

000

Table 11-2.

Sleep Mode Select

SM2

SM1

SM0

Sleep Mode

000

Idle

ADC Noise Reduction

010

Power-down

011

Power-save

100

Reserved

101

Reserved

Standby(1)

Extended Standby(1)

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