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ATMEGA640 Datasheet(PDF) 54 Page - ATMEL Corporation

Part # ATMEGA640
Description  8-bit Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
PDF  449 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATMEGA640 Datasheet(HTML) 54 Page - ATMEL Corporation

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ATmega640/1280/1281/2560/2561
2549K–AVR–01/07
Register Description
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 25.
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 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 wak-
ing up.
Bit
7654
321
0
0x33 (0x53)
––––
SM2
SM1
SM0
SE
SMCR
Read/Write
R
RRR
R/W
R/W
R/W
R/W
Initial Value
0000
000
0
Table 25. Sleep Mode Select
SM2
SM1
SM0
Sleep Mode
00
0
Idle
0
0
1
ADC Noise Reduction
0
1
0
Power-down
01
1
Power-save
1
0
0
Reserved
1
0
1
Reserved
1
1
0
Standby(1)
1
1
1
Extended Standby(1)



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