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ATMEGA48 Datasheet(PDF) 43 Page - ATMEL Corporation

Part # ATMEGA48
Description  8-bit Microcontroller with 8K Bytes In-System Programmable Flash
PDF  374 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATMEGA48 Datasheet(HTML) 43 Page - ATMEL Corporation

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43
2545J–AVR–12/06
ATmega48/88/168
8.9
Register Description
8.9.1
SMCR – Sleep Mode Control Register
The Sleep Mode Control Register contains control bits for power management.
• Bits 7..4 Res: Reserved Bits
These bits are unused bits in the ATmega48/88/168, and will always read as zero.
• Bits 3..1 – SM2..0: Sleep Mode Select Bits 2, 1, and 0
These bits select between the five available sleep modes as shown in Table 8-2.
Note:
1. Standby mode is only recommended for use with external crystals or resonators.
• Bit 0 – 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.
Bit
7
654
32
10
0x33 (0x53)
–
–
–
–
SM2
SM1
SM0
SE
SMCR
Read/Write
R
R
R
R
R/W
R/W
R/W
R/W
Initial Value
0
0
0
0
0
0
0
0
Table 8-2.
Sleep Mode Select
SM2
SM1
SM0
Sleep Mode
00
0
Idle
0
0
1
ADC Noise Reduction
0
1
0
Power-down
0
1
1
Power-save
10
0
Reserved
10
1
Reserved
1
1
0
Standby(1)
11
1
Reserved



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